STEUEREINRICHTUNG FUER EIN HYDROSTATISCHES GETRIEBE

Verfahren zur Regelung einer Hydropumpe und elektronische Steuereinheit

Regulator for engine-driven hydro-pump of variable supply volume

The regulator operates on the reversible hydro-pump (2), which is connected to the tank (9) via a suction line (8) and to a hydro-motor (not shown) via two working lines (10,11) in a closed loop, and is driven by the vehicle engine (1) with hydrostatic transmission. An auxiliary pump (18) mechanically coupled by a shaft (17) produces a volume flow directly proportional to the rotational speed of the engine. A regulator valve (19) has a measuring constriction (20) developing a pressure difference from which a speed-related control pressure (p3) is produced in a line (26) to an adjustor (4) of the pump volume. The line passes through a three-port two-position valve (21) operated by an engine-speed-dependent signal (36). An electrically operated 4/3 way valve serves as a reversible i.e direction of travel valve (5), and the hydro-pump (2) feeds a pressure medium through a working line (10) or (11) to the hydro-motor (not shown) so that the vehicle travels in a direction corresp. to the control ...

STEUEREINRICHTUNG FUER EIN HYDROSTATISCHES GETRIEBE

Regelvorrichtung fuer ein hydrostatisches Getriebe fuer Kraftfahrzeuge

HYDROSTATISCHER DREHMOMENTENWANDLER FUER FAHRANTRIEBE

HYDROSTATIC CONTROL SYSTEMS FOR CONTINUOUSLY-VARIABLE POWER DRIVE UNITS

... 1326471 Hydrostatic transmission control LINDE AG 14 Jan 1971 [15 Jan 1970 10 April 1970] 1775/71 Heading F2D In a control system for a hydrostatic transmission wherein a follow-up servo motor 9 adjusts the displacement of a pump 1 in response to movement of a pilot valve 14 actuated by pressure liquid supplied through lines 15, 16 from manually controlled valves 17, 22, a bleedoff valve 34 responsive to an operating parameter (e.g. speed or torque) is connected through a shuttle valve 31 to the control pressure lines 15, 16 downstream of restrictors 33. As shown, pumps 1, 41 of identical hydrostatic transmission driving tracks on opposite sides of a vehicle are driven from a common engine and are in closed circuit with the variable displacement motors 4, 44. A manual control 39 selectively actuates control valves 17, 22, 57, 62 which supply pressure liquid frcm an auxiliary pump 6 through control pressure lines 15, 16, 55, 56 to opposite ends of the pilot valves 14, 54 to effect idential ...

HYDRAULIC TRANSMISSION

... 1382455 Hydrostatic transmission ROBERT BOSCH GmbH and ZAHNRADFABRIK FRIEDRICHSHAFEN AG 27 June 1972 [28 June 1971] 29968/72 Headings F2D and F2W In the hydrostatic transmission shown, in which a prime mover 1, having an accelerator pedal 17, drives a pump 2, which may be adjustable in output, having a lever 29 to control its delivery, as well as that of an adjustable motor 5 through linkage 38, 381, a further control 27 is provided which can simultaneously reduce prime mover speed by adjustment of member 16 and increase the gear ratio by adjustment of pump 5, through piston and cylinder devices 20, 27 and 32, 33. The lever 27 controls a two position valve 26 which supplies pressure to one side or the other of the cylinders 20, 32 from a feed pump 7 through lines 24, 36 and 25, 35, to thus vary the lengths of the linkages connecting accelerator pedal 17 and prime mover 1, and lever 29 and adjusting arm 39 of the motor 5 to effect a control similar to that of an overdrive. The motor ...

Improvements in pumps

... 1,105,709. Fluid-pressure servomotor systems. SPERRY RAND CORPORATION. Dec. 31, 1965 [Dec. 31, 1964], No. 55343/65. Heading G3P. [Also in Division F2] A variable displacement pump, having a swashplate biased to the maximum stroke position and moved to decrease displacement by a servopiston when a predetermined pump outlet pressure opens a control valve, is also provided with a bypass valve that allows the outlet pressure to act on the servopiston during starting, thereby obviating high starting torques, the by-pass valve being closed when the outlet pressure reaches a value considerably lower than said predetermined pressure. As shown, during starting the pump outlet passage 72 is connected by lines 82, 84, bore 132 housing by-pass valve 134, and bore 91 to the interior of a sleeve 76 over which a piston (74) Fig. 1 (not shown) is slidable. Piston (74) is thereby moved to reduce pump displacement. When the outlet pressure reaches a first value, it acts on the end 150 of valve 134 via passages ...

VEHICLE DRIVE SYSTEM

A hydrostatic transmission

A drive system has an engine that operates a control pump and a hydraulic variable-displacement drive pump having a control element and connected to a hydraulic motor. A servocylinder operates the control element of the drive pump and is pressurized through a control line connected to the control-pump output. A control valve is connected between the control line and the sump of the system and is connected to the hydraulic line between the motor and the drive pump to reduce pressure in the control line when the higher pressure of the line between the drive pump and the motor rises within a predetermined range. Thus it is possible with a substantially constant engine speed to produce a substantially constant output torque, with only the displacement of the pump and pressure in the lines between the pump and the motor varying by appropriate control of the control-line pressure.

Improvements relating to automatic control apparatus for engine transmissions

... 828,228. Controlling vehicles. DAIMLER-BENZ A. G. Dec. 17, 1956 [Dec. 16, 1955], No. 38488/56. Class 79(5) [Also in Group XXIX] Automatic control apparatus for an engine driving through a variable speed transmission, comprises a regulator which limits the maximum permitted speed cf the engine in dependence upon output speed from the transmission, in such a manner that the maximum permitted engine speed increases as the output speed increases, and means for cancelling the engine speed limitation and permitting the engine speed to be increased up to maximum engine speed. In the example described the invention is applied to a hydrostatic transmission of a motor vehicle. An engine driven pump P1 and a vehicle driven pump P2 supply oil to a changeover valve R1 comprising component valves 103, 104 urged apart by a spring 102. The valve 103 or 104 under the greater pressure opens to supply pressure to a pipe 1 leading to a pressure regulator D1. A delivery pipe 2 leads to centrifugal governors ...

VEHICLE WITH HYDRAULIC TRANSMISSION

HYDROMECHANICAL TRANSMISSION FOR A AGRICULTURAL HARVESTING MACHINE

HYDROSTATIC TRANSMISSION CONTROL

Process for activating a hydrotreating catalyst

APPARATUS FOR DAMPING THE PRESSURE INCREASE OF HYDROSTATIC DRIVES

MANUAL AND AUTOMATIC GOVERNOR FOR A HYDROSTATIC TRANSMISSION

HYDRAULIC CONTROL FOR VARIABLE DISPLACEMENT PUMPS

DUAL-SPEED SETTING UNDERSPEED SYSTEM

ANTI-STALL CONTROL FOR ELECTRICAL HYROSTATIC TRANSMISSION CONTROL SYSTEM

CONTROL CIRCUIT FOR VARIABLE DISPLACEMENT PUMP WITH VENTURI BYPASS CONTROL

CONTROL CIRCUIT FOR VARIABLE DISPLACEMENT PUMP WITH VENTURI BYPASS CONTROL A control circuit (10) for the variable displacement pump (18) of a hydrostatic transmission (16) or the like comprises an underspeed actuator (31) connected to the servo system (19) of the pump (18), a venturi (15) interconnected between a source of pressurized working fluid(11) and the pump (18) and a pressure regulating valve (36) interconnected between a downstream side of the venturi (15) and the pump (18). A throat (29) and upstream side of the venturi (15) are connected to the underspeed actuator (31) for communicating a differential fluid pressure signal thereto to automatically control the displacement of the the pump (18) under certain operating conditions of an engine of a vehicle. This invention is directed to a bypass arrangement (39) interconnected between a downstream side of the pressure regulating valve (36) and the upstream side of the venturi (15) to closely control the fluid pressure drop across ...

METHOD OF CONTROLLING SPEED REDUCTION RATIO FOR CONTINUOUSLY VARIABLE SPEED TRANSMISSION

A method of controlling speed reduction ratio comprises the following steps: determining "EB-REF-engine speed" which is higher than "R-REF-engine speed" when the accelerator opening is substantially closed and the vehicle bralce is appiied simultaneously, and controlling speed reduction ratio so that the actual engine speed coincides with the EB-REF engine speed. Although the above method also comprises the following steps as a normal ratio control: setting the R-REF engine speed in relation to the accelerator opening, and controlling speed reduction ratio so that the actual engine speed coincides with the R-REF engine speed.

DUAL-SPEED SETTING UNDERSPEED SYSTEM

DUAL-SPEED SETTING UNDERSPEED SYSTEM A hydraulic power system having a plurality of variable displacement pumps for supplying pressurized fluid for manipulation of an implement includes a control system operative to automatically adjust pump displacement to the output horsepower of a prime mover driving the pumps of the system. The control system includes underspeed valve means responsive to a deviation in the speed of the prime mover from a predetermined normal speed and a selectable second speed to transmit a fluid pressure signal to a servocontrol means for adJusting the displacement of the pumps. The control system includes a valve for selectively conditioning the control system to cause the underspeed valve to respond to a deviation of the selected engine speed and an indicator for indicating the conditioning of the control system.

CONTROL FOR HYDROSTATIC TRANSMISSION

SPLIT TORQUE TRANSMISSION CONTROL

SEQUENTIAL PRECONDITIONING CIRCUIT FOR HYDROSTATIC TRANSMISSION

Stufenlos regelbares Getriebe

Antrieb mit regelbarer Ölpumpe und mindestens einem Ölmotor.

Getriebeanlage mit hydrostatischem Getriebe für Fahrzeuge.

Steueranlage an einem hydrostatischen Getriebe

Hydraulische Regelungseinrichtung

Control circuit for variable displacement pumps with override valve

CONTROL DEVICE FOR HYDROSTATIC GEAR BOX

CONTROL DEVICE OF the CIRCUITS OF LUBRICATION AND LOAD Of a TRANSMISSION

HYDRAULICALLY REGULATED DRIVE

Automatic adjustment, in particular for hydrostatic shifting of speed

MECHANISM Of DRIVE FOR VEHICLES USING a HYDRAULIC PUMP AND an ENGINE

CONTROL DEVICE OF TRANSMISSION OF VEHICLE

Hydrostatic variable speed transmission

Förfarande för att driva en kontinuerligt varierbar transmission med hydrostatisk/mekanisk momentuppdelning, samt transmission för utförande av förfarandet.

Efficiency based integrated power train control system

A power train control system for a mobile machine is disclosed. The power train control system has a power source configured to produce a power output, a transmission device operatively connected to receive the power output and propel the mobile machine, and a control module. The control module is configured to receive an indication of a power demand, receive an indication of a current travel speed of the mobile machine, and reference the power demand and the current travel speed with a power train efficiency map to determine a desired power source speed. The power train control system is also configured to control operation of the transmission device to bring a speed of the power source within a predetermined amount of the desired power source speed.

Еffiсiеnсу bаsеd intеgrаtеd pоwеr trаin соntrоl sуstеm

А pоwеr trаin соntrоl sуstеm fоr а mоbilе mасhinе is disсlоsеd. Тhе pоwеr trаin соntrоl sуstеm hаs а pоwеr sоurсе соnfigurеd tо prоduсе а pоwеr оutput, а trаnsmissiоn dеviсе оpеrаtivеlу соnnесtеd tо rесеivе thе pоwеr оutput аnd prоpеl thе mоbilе mасhinе, аnd а соntrоl mоdulе. Тhе соntrоl mоdulе is соnfigurеd tо rесеivе аn indiсаtiоn оf а pоwеr dеmаnd, rесеivе аn indiсаtiоn оf а сurrеnt trаvеl spееd оf thе mоbilе mасhinе, аnd rеfеrеnсе thе pоwеr dеmаnd аnd thе сurrеnt trаvеl spееd with а pоwеr trаin еffiсiеnсу mаp tо dеtеrminе а dеsirеd pоwеr sоurсе spееd. Тhе pоwеr trаin соntrоl sуstеm is аlsо соnfigurеd tо соntrоl оpеrаtiоn оf thе trаnsmissiоn dеviсе tо bring а spееd оf thе pоwеr sоurсе within а prеdеtеrminеd аmоunt оf thе dеsirеd pоwеr sоurсе spееd.

HYDRAULIC LOGIC CONTROL FOR VARIABLE CAPACITY TYPE PUMP

Regelvorrichtung fuer einen durch eine Brennkraftmaschine angetriebenen hydrostatischen Fahrzeugantrieb

Hydrostatic vehicle transmission system - has control system damper throttle bypassed by valve at low pressure

The hydraulic adjusting rams for the pump and/or motor are returned automatically by springs to the starting position on cessation of pressure in their control system, which is connected to a constant-volume pump and a regulating unit for the flow to the return pipe. A damping throttle is provided in the pipe to the arms, and parallel to this is a non-return valve opening in the opposite direction to that in which the pump delivers. Also in parallel with the damping unit is a valve bypassing it under servo-control below a predetermined control pressure. A valve can be provided, held open by a spring and closed by the pressure on the ram side. A pressure switch can be provided after the damping unit, connected to an electromagnet valve control unit.

DIFFERENZDRUCK-REGELVENTIL FUER EIN HYDROSTATISCHES ANTRIEBSSYSTEM

STEUERSYSTEM FUER EIN STROEMUNGSMITTELANGETRIEBENES FAHRZEUG

Sicherheitsvorrichtung für einen geschlossenen hydraulischen Kreislauf.

Überdrehzahlsteuersystem für ein hydromechanisches Antriebssystem

Gemäß eines Aspektes der vorliegenden Erfindung wird eine Vorrichtung zur Steuerung der negativen Last auf einen Antriebsmotor offenbart. Der Antriebsmotor ist treibend mit einem hydromechanischen Antriebssystem verbunden, welches eine Pumpe und einen Motor mit variabler Verdrängung aufweist. Ein Antriebsmotordrehzahlsensor fühlt die Drehgeschwindigkeit des Antriebsmotors ab und erzeugt ein Ist-Antriebsmotordrehzahlsignal, welches die Antriebsmotordrehzahl anzeigt. Ein Fahrgeschwindigkeitssensor fühlt die Fahrgeschwindigkeit der Maschine ab und erzeugt ein Ist-Fahrgeschwindigkeitssignal, welches die Maschinenfahrgeschwindigkeit anzeigt. Eine Überdrehzahlsteuervorrichtung vergleicht das Ist-Antriebsmotordrehzahlsignal mit einer proportionalen und integralen Schwelle, erzeugt ein proportionales und integrales Fehlersignal, welches die Differenz zwischen der Ist-Antriebsmotordrehzahlsignalgröße und den entsprechenden Schwellen anzeigt, berechnet ein Proportional- und Integralsteuersignal aus den entsprechenden Fehlern, kombiniert die Proportional- und Integralsteuersignale und erzeugt darauf ansprechend ein Befehlssignal. Eine Verdrängungssteuervorrichtung empfängt das Befehlssignal und steuert entsprechend ein Teil der variablen Pumpe und des variablen Motors, um die negative Antriebsmotorlast zu regeln, um die Verzögerungsleistung des Antriebsmotors zu optimieren, ohne den Antriebsmotor oder den Antriebsstrang mit Überdrehzahl zu belasten. In accordance with one aspect of the present invention, an apparatus for controlling the negative load on a drive motor is disclosed. The drive motor is drivingly connected to a hydromechanical drive system which has a pump and a motor with variable displacement. An engine speed sensor senses the speed of rotation of the engine and generates an actual engine speed signal indicative of the engine speed. A driving speed sensor senses the driving speed of the machine and generates an actual driving speed signal which indicates the ...

Getriebeanlage mit einem stufenlos verstellbaren hydrostatischen Getriebe, insbesondere fuer Fahrzeuge

ANTI-STALL CONTROLLER

Control device for a hydrostatic transmission

The invention relates to a control device for a hydrostatic transmission, the set position of which is determined by the magnitude of a control pressure, in which, with a view to "automotive" control, a constant-displacement pump connected to a transmission input shaft delivers to a measuring orifice 7 and the pressure built up in front of this measuring orifice 7 is used as a control signal. In order to permit optimum matching of the interaction of the setting of the primary energy source and of the transmission and to permit combinations with other control parameters, a pressure relief valve 19 which limits the maximum control pressure is connected to the line 5 upstream of the measuring orifice 7. ...

Improvements in or relating to automatic governors of infinitely variable-speed drives

... 940,204. Variable-speed control. REGIE NATIONALE DES USINES RENAULT. April 13, 1960 [April 23, 1959], No. 13210/60. Headings F2C and F2D. In an automatic control for a continuous variable-speed gear in a vehicle, which gear may be mechanical, electrical, or hydraulic such as the fixed capacity pump/variable capacity motor 2, 5 shown, a spring-biased servomotor 11 indirectly or, as shown, directly actuating a ratio determining lever 7 controlling means such as a rheostat, valve, or pump capacity control is responsive to gaseous or liquid pressure regulated, from a higher feed pressure, through a pressure-reducing regulator 14 the thrust on a pressure-balancing spring 25 of which is varied by at least vehicle speed and engine load responsive means respectively acting to provide higher and lower gear as they increase. For engine braking, manual lever 45 and/or brake pedal 49 control may also vary the thrust of spring 25. The regulator 14 comprises a housing 17 having a bored piston 15 sliding ...

Improvements in vehicle transmissions

... 1,011,700. Hydrostatic transmissions. ROBERT BOSCH G.m.b.H. Aug. 4, 1964 [July 25, 1963], No. 31022/64. Heading F2D. In a vehicle transmission including an hydrostatic gear unit and centrifugal regulators for controlling the engine fuel pump and the gear unit respectively, the accelerator pedal is so coupled to the regulators that during its movement it is first effective only on the engine regulator, then on both the engine regulator and the loading spring of the gear regulator, and finally only on the gear regulator loading spring. In the arrangement shown, an engine 1, fitted with an injection fuel pump 2 is coupled by a shaft 11 and clutch 13 to the pump 4 of a swash plate type pump and motor gear unit 4, 5, controlled by an hydraulic regulator 6 comprising a piston 39 loaded by a centering spring 45 and connected to a servo control valve 60 connected to the gear unit swash plate 52 by a linkage 51. The gear regulator 7 comprises a pressure-control valve 18 connected to the servo unit ...

Improvements in power plants comprising an internal combustion engine provided with a governor and a variable ratio transmission

... 987,034. Regulating I.C. engines. SOC. INDUSTRIELLE GENERALE DE MECANIQUE APPLIQUEE. June 13, 1963 [June 26, 1962], No. 23556/63. Heading FIB. [Also in Divisions B7 and G3] In an internal combustion engine power plant having a governor 13, Fig. 1, and a variable ratio transmission interposed between the engine 1 and a driven part 5 e.g. vehicle wheels, the governor is controlled in accordance with the position of a movable element 29 Fig. 3 subjected to a resilient force applied by the throttle control 14 and to a force varying in accordance with the speed of the driven part, so arranged that for a given setting of throttle control 14, the speed of the driven part tends to remain constant. Diesel engine 1 drives a pump 2 which supplies hydraulic fluid to a motor 4 driving wheels 5. A fuel injection pump 10 is controlled by a governor mechanism 13 in which a centrifugal governor 15, Fig. 2, acts through disc 16 and lever 25 to move the fuel injection pump control rack 12. Movement of disc ...

HYDROSTATIC DRIVE SYSTEM

... 1341361 Vehicle transmission CMI CORP 13 Jan 1972 1681/72 Heading B7H [Also in Division F2] A vehicle, for use in road construction equipment is powered by an engine 24 driving the variable displacement pump 26 of a hydrostatic transmission also having a variable displacement motor 38 and a fixed displacement motor 40 these driving the wheels 16 of the vehicle via gearing, a shaft 100 and chains. The embodiment shown has two such transmissions, controlled electrically by circuitry 224 (Fig. 9, not shown). A pedal 264 for control of the transmissions is shown in Fig. 8 and comprises potentiometers 302, 304 operated in turn as contacts 306 and 308 respectively move along them when pedal 264 is depressed to move the linkage. The voltage on the brushes is used to adjust pump and motor displacements. A mechanical pedal operated control for the vehicle with one transmission only is shown in Fig. 4, two cam discs (one, 114, is shown) rotating due to a crank 110 operated by the pedal firstly adjusting ...

CONTROL FOR HYDROSTATIC TRANSMISSIONS

... 1494243 Hydrostatic transmission control SUNDSTRAND CORP 13 Feb 1975 [13 Feb 1974] 6076/75 Heading F2W In a hydrostatic transmission a control pump 110 (Fig. 2A) provides an output which is proportional to the speed of a prime mover and a control valve 140 adjusts a control pressure to adjust the transmission ratio to maintain the prime mover speed substantially constant, or to vary this speed in response to the output from pump 110 and the load on the prime mover. Transmission arrangement.-As shown in Fig. 1, a pair of transmissions are provided, each comprising a variable displacement swashplate pump 32, a variable displacement swashplate motor 33, a feed pump 53, a shuttle valve 70 for directing fluid from the lower pressure main line 11 or 12 to a reservoir 54 from which cooled and filtered fluid is drawn by the charge pump, high pressure relief valves 81, 82 and a by-pass valve 90 which short-circuits the transmission on no pressure being received from feed pump 53. Feed pump 53 also ...

Hydrostatic transmission control system

A transmission having hydraulic components including a hydrostatic unit with a variable displacement component having a hydraulic displacement control with a lubrication circuit for the components and a charge circuit for supplying fluid under pressure. First and second pumps are connected in series, with the first pump having a larger volume than the second pump to provide fluid to the second pump and to a lubricating circuit. A fluid line connects between the charge circuit and the lubrication circuit and has a lubrication priority valve therein which operates to provide fluid flow from the charge circuit to the lubrication circuit when required to maintain pressure in the lubrication circuit. Additionally, the charge circuit has a pair of branch lines, with one branch line having a charge priority valve therein which functions to control the flow through the one branch line leading to the hydraulic displacement control for the hydrostatic unit and to thus provide pressure control in ...

Hydrostatic transmission

... 1,085,176. Hydrostatic transmissions. SUNDSTRAND CORPORATION. April 5, 1965 [May 11, 1964], No. 14419/65. Heading F2D. An hydrostatic transmission comprises an over-ride control including a governor producing a signal in response to increasing engine load and an over-ride valve responsive to the signal and disposed between a charge pump and a main pump displacement control valve. The system shown includes swashplate pump and motor units 14, 16, the pump swashplate 24 being controlled by a manual servo valve 82, as described in Specification 1,044,867, the over-ride valve 79 mounted between the charge pump 44 and valve 82 having a solenoid 101 controlled by an engine-driven centrifugal governor 80, Fig. 3 (not shown), and operating an electric switch 105. If overloading occurs governor 80 closes switch 105 to energize a solenoid 101 and move the over-ride valve element 94 to the right against a loading spring 100, thereby connecting servo valve 82 to exhaust to centre the swashplate 24.

HYDROSTATIC TRANSMISSION

... 1482571 Hydrostatic transmission control CESSNA AIRCRAFT CO 27 Aug 1974 [4 Sept 1973] 37477/74 Heading E2W A control system for a motor vehicle hydrostatic transmission having a variable displacement swash-plate pump 12 supplying pressure liquid to a fixed or variable displacement motor 30 comprises a small fixed displacement engine driven pump 16 supplying liquid at a pressure determined by a fixed or variable orifice 23 to a pump displacement adjusting servo 20 which increases pump displacement against the bias of a spring 24. As engine speed increases the output of the pump 16 increases to increase the pressure in the servo 20 and thus increase pump displacement. As shown the orifice 23 comprises tapered slots in the servo piston 22 and thus the orifice size increases with increasing pump displacement to provide a predetermined engine speed-pump displacement characteristic. An additional servo 40 responsive to the supply pressure 28 of the pump 12 decreases pump displacement when the ...

HYDROSTATISCHES FAHRZEUGGETRIEBE

HYDROMECHANICAL TRANSMISSION

CONTROLS FOR COMBINED HYDROSTATIC AND MULTIPLE SPEED RANGE TRANSMISSION UNITS WITH MATIC SPEED CONTROL AND BRAKING FUNCTIONS

SEQUENTIAL PRECONDITIONING CIRCUIT FOR HYDROSTATIC TRANSMISSION

AUTOMATIC CONTROL SYSTEM FOR HYDROSTATIC DRIVE

HYDROSTATIC TRANSMISSION

POWER TRANSMISSION

A hydraulic system comprising a full flow supercharged variable displacement pump and a fixed displacement charge pump adapted to be driven by the same prime mover as the variable displacement pump for supplying fluid to the variable displacement pump. An orifice is provided in the supply line to the variable displacement pump, a circuit is provided from a point downstream of the orifice to tank pressure, and a feedback valve is provided in series with the circuit. The feedback valve comprises a pair of mutually and oppositely adjustable flow restrictions in series with said circuit. The restrictions are connected to the displacement varying means to vary them equally and oppositely in proportion to the movements of the displacement varying means. A speed sensing control valve is responsive to the pressure level between the two restrictions and the pressure level upstream of the orifice and is connected to the outlet of the variable displacement pump and operable to operate the displacement ...

HYDRAULIC CONTROL FOR VARIABLE DISPLACEMENT PUMPS

A hydraulic system for controlling the displacement of a plurality of variable displacement pumps driven by a single prime mover including a source of pilot fluid under pressure including a fixed displacement pump adapted to be driven by the prime mover proportional to the speed thereof, a double-piloted, underspeed valve having an inlet and an outlet, the outlet being adapted to be connected to the variable displacement pumps for controlling displacement thereof, a conduit connecting one of the pilots to the source, an additional conduit, including a flow restricting device, connecting the other of the pilots to the source, and a summing valve having ports adapted to be connected to respective ones of the pumps, a port connected to the second conduit and a port connected to the inlet of the underspeed valve.

UNDERSPEED ACTUATOR FOR A HYDROSTATIC TRANSMISSION HAVING A SHUNT VALVE

UNDERSPEED ACTUATOR FOR A HYDROSTATIC TRANSMISSION HAVING A SHUNT VALVE An underspeed actuator has a piston connected to a control means of a first pump driven by a prime mover and is movable between a first position at which the first pump is at minimum displacement and a second position at which the first pump is at maximum displacement. The underspeed actuator has first and second actuating chambers at opposite ends of the piston and a biasing device urging the piston toward the first position. The piston is movable between the first and second positions in response to pressure differential in said first and second chambers. A signal device controllably develops first and second control signals in response to the operating speed of the prime mover. First and second conduits deliver said first and second control signals to said first and second chambers, respectively. A shunt valve is connected to the first and second conduits for passing fluid expelled from the first chamber to the second ...

INFINITELY VARIABLE ORIFICE FOR PART THROTTLE CONTROL

HYDRAULIC CONTINUOUSLY VARIABLE SPEED TRANSMISSION WITH DIRECT CLUTCH VALVE

A hydraulic continuously variable speed transmission with a direct clutch valve comprises a hydraulic pump, a hydraulic motor, a hydraulic closed circuit for hydraulically connecting the both, a direct clutch valve placed in the closed circuit, a speed reduction ratio control actuator, and a direct clutch valve controlling device for controlling operations of said direct clutch valve to block the closed circuit when the speed reduction ratio becomes substantially "1". The direct clutch valve controlling device maintains direct connecting state when an actual engine speed is higher than a direct clutch disconnecting reference engine speed at the speed reduction ratio of approximately "1". Then, the direct clutch valve control device releases the blocking of the closed circuit by the direct valve when a drop of the actual engine speed from the direct clutch disconnecting reference engine speed exceeds a predetermined amount corresponding to the vehicle speed.

POWER MACHINE OR VEHICLE WITH POWER MANAGEMENT

Power management control for a power machine or vehicle is disclosed. In illustrated embodiments, a user interface (130) of the power machine or vehi cle includes a power management selection (232) for activating and deactivat ing power management control. In illustrated embodiments, power management c ontrol is implemented through a power management control component (222) bas ed upon feedback from an RPM sensor (224). As disclosed in illustrative embo diments, the power management control component (222) utilizes control metho ds and characteristics stored in system memory to determine control input to adjust hydrostatic parameters for power management.

CONTROL FOR A HYDROSTATIC TRANSMISSION

REGULATION AND CONTROL DEVICE FOR A HYDRAULIC FLUID POWER

REGULATION AND CONTROLGEAR FOR a GROUP Of DRIVE, IN PARTICULAR Of a MOTOR VEHICLE

REGULATOR FOR A HYDRAULIC SYSTEM

CONTROL DEVICE FOR HYDROSTATIC GEAR BOX

Valve of derivation intended to be used with pumps with compensated pressure, variable flow

Automatic device of regulation for hydrostatic transmissions used for motor vehicles

Hydrostatic transmission regulator - has circuit inducing extra pressure reducer slide valve force above defined pump speed

UNDERSPEED VALVE

TRANSMISSION RATIO CONTROL SYSTEM

A method for slowing down a vehicle with hydrostatic drive and vehicle planned for that, appliquénotamment with lifting trucks

... a) Procédé pour freiner un véhicule avec entraînement hydrostatique et véhicule prévu pour cela, appliqué notamment à des chariots élévateurs, b) caractérisé en ce que lors du dépassement d'une vitesse de rotation du moteur d'entraînement (1) pendant le freinage, on conserve le réglage du volume d'absorption atteint ou l'on fixe le volume d'absorption sur une valeur définie jusqu'à ce que la vitesse limite de rotation soit à nouveau sous-dépassée, le réglage du moteur hydraulique (4) se poursuivant dans le sens du volume d'absorption le plus grand possible.

Hydrostatic transmission with after-coupled gearbox - has gear change valves operating according to differential speed of couplings, to ensure smooth gear change

REGULATION AND CONTROLGEAR FOR a GROUP Of DRIVE, IN PARTICULAR Of a MOTOR VEHICLE

MECHANISM Of DRIVE FOR VEHICLES USING a HYDRAULIC PUMP AND an ENGINE

mORE HYDROSTATICALLYdRIVING DRIVEStORQUE CONVERTER ON

INSTALLATION OF ORDER AND REGULATION FOR AN ADJUSTABLE HYDRAULIC UNIT

Equipment for delivering construction material, such as mortar, to site comprises motor, speed switch, progressive starting equipment, reducer, agitator and helicoidal screw type output pump

A trailer (1) houses a building material tank (2) and a single phase electric motor (15). The motor drives an agitator (12) and on the same shaft a helicoidal screw type output/input pump (5) connected to a pipe (8). The drive from the motor (15) comprises a speed switch (16) and a reducer (18) and includes an oil system which allows the motor to gradually build up to working speed.

Hydraulic fluid power with variable ratio

Hydraulic fluid power

PROCESS FOR ACTIVATING A HYDROTREATING CATALYST

Engine-overrun-preventing control device for work vehicle

In an engine-overrun-preventing control device, if an engine speed exceeds a maximum speed, a minimum value of an inching rate is set such that higher the actual engine speed results in a higher minimum value of an inching rate. The hydraulic pump displacement is adjusted to obtain a higher inching rate between the minimum value of the inching rate and an inching rate set based on a brake stroke. If the engine speed exceeds a commanded speed and a pressure time-rate-of-change at the pump intake exceeds a prescribed value, the minimum value of the inching rate is set such that the higher the pressure time-rate-of-change, the higher the minimum value of the inching rate. The pump displacement is adjusted to obtain a higher inching rate between the minimum value of the inching rate set based on the pressure time-rate-of-change and the inching rate set based on the brake stroke.

WORK VEHICLE AND CONTROL METHOD FOR WORK VEHICLE

A hydraulic pump is driven by an engine. A hydraulic motor is driven by hydraulic fluid discharged from the hydraulic pump thereby causing a vehicle to travel. A controller controls a rotation speed of the engine and a displacement of the hydraulic pump. The controller acquires a tractive force of the vehicle. The controller changes the rotation speed of the engine to a low speed side in accordance with a reduction in the tractive force. 1. A work vehicle comprising:an engine;a hydraulic pump driven by the engine;a hydraulic motor driven by hydraulic fluid discharged from the hydraulic pump to travel the work vehicle; anda controller for controlling a rotation speed of the engine and a displacement of the hydraulic pump, acquire a tractive force of the vehicle; and', 'change the rotation speed of the engine to a low speed side in accordance with a reduction in the tractive force., 'the controller being configured to'}2. The work vehicle according to claim 1 , wherein control the rotation speed of the engine and the displacement of the hydraulic pump so that an output torque of the engine and an absorption torque of the hydraulic pump match each other,', 'acquire the tractive force of the vehicle, and', 'control the rotation speed of the engine and the displacement of the hydraulic pump under a variable matching control that changes a matching point of the output torque of the engine and the absorption torque of the hydraulic pump to the low speed side of the rotation speed of the engine in accordance with the reduction in the tractive force., 'the controller is further configured to'}3. The work vehicle according to claim 2 , whereinthe controller is further configured to control the rotation speed of the engine and the displacement of the hydraulic pump under the variable matching control so that the matching point of the output torque of the engine and the absorption torque of the hydraulic pump is changed to the low speed side of the rotation speed of the engine ...

HYDROSTATIC TRANSMISSION AND METHOD FOR BRAKING USING THE SAME

A hydrostatic transmission implements a braking system, in which at least one adjustable traction motor acting as a pump is supported via a closed circuit on an adjustable axial piston machine acting as a motor, which in turn is supported on an internal combustion engine. Since the internal combustion engine should not be rotated at excessive revolution rates, a control unit adjusts the swivel angle of the axial piston machine during braking. The axial piston machine is load-sensitive, as a relationship between the control pressure and the revolution rate and the pivot angle of the machine consists of a pressure difference between the two working lines of the closed circuit. Using a pre-control, a swivel angle of the axial piston machine is set during braking, and the swivel angle is corrected by a revolution rate controller, such that a target revolution rate is obtained on the combustion engine. 1. A hydrostatic transmission for a traction drive , comprising:a primary unit configured to be coupled to an internal combustion engine of the traction drive via a primary rotor, the primary unit is an axial piston machine with an adjustable swivel angle;a secondary unit configured to be coupled to an output of the traction drive via a secondary rotor;two primary working lines of a closed circuit each configured to connect the primary unit and the secondary unit;an electrical control unit configured to control the swivel angle of the primary unit during braking of the hydrostatic transmission, wherein, during braking, in a motor mode of the primary unit forces act that depend on at least one of (i) a pressure difference of the two primary working lines, and (ii) a revolution rate of the primary rotor, and that lead to an increase in the swivel angle of the primary unit; anda revolution rate controller, an output variable of the revolution rate controller is a correction control pressure acting towards reducing the swivel angle of the primary unit, which is added by the ...

Inching System for a Construction Vehicle

An inching system for a vehicle having a hydrostatic transmission and an engine that drives the transmission. The transmission has a pilot pressure port with a pressure of hydraulic fluid at the pilot pressure port controlling a level of power from the transmission, a beginning of draining of the hydraulic fluid from the pilot pressure port defining an inching starting point. The system includes a brake pedal and an electrohydraulic valve coupled to the pilot pressure port of the transmission, the valve being configured to drain the hydraulic fluid at the pilot pressure port. A sensor is coupled to the pedal to detect an input from the operator, the sensor producing a signal indicative of the input from the operator. A controller receives the signal and a speed of the engine. The controller controls the electrohydraulic valve dependent upon the signal and the engine speed so that the inching starting point is unchanged regardless of the speed of the engine. 1. An inching system for a loading vehicle having ground engaging devices , a hydrostatic transmission , brakes , and an engine , the hydrostatic transmission having hydraulic fluid , the engine configured for driving a hydraulic pump that supplies the hydraulic fluid within the hydrostatic transmission , the hydrostatic transmission configured for providing rotational power to the ground engaging devices , the hydrostatic transmission further having a pilot pressure port with a pressure of the hydraulic fluid at the pilot pressure port controlling a level of the rotational power from the hydrostatic transmission , a beginning of draining of the hydraulic fluid from the pilot pressure port defining an inching starting point , the inching system comprising:a brake pedal operable by an operator to activate the brakes of the vehicle;an electrohydraulic valve hydraulically coupled to the pilot pressure port of the hydrostatic transmission, the electrohydraulic valve being configured to drain the hydraulic fluid at ...

WORK VEHICLE AND CONTROL METHOD FOR WORK VEHICLE

A controller determines a target rotation speed of an engine from an operation amount of an accelerator operating member. The controller determines whether a vehicle is in coasting deceleration. The controller decreases a differential pressure between a first circuit and a second circuit of a hydraulic circuit according to a deviation between an actual rotation speed of the engine and the target rotation speed, or the operation amount of the accelerator operating member when the vehicle is in the coasting deceleration. 1. A work vehicle comprising:an engine; a travel pump configured to be driven by the engine, the travel pump including a first pump port and a second pump port,', 'a hydraulic circuit connected to the travel pump, and', 'a travel motor including a first motor port and a second motor port, the travel motor being connected to the travel pump through the hydraulic circuit,', a first circuit connecting the first pump port and the first motor port, and', 'a second circuit connecting the second pump port and the second motor port;, 'the hydraulic circuit including'}], 'a hydrostatic transmission including'}an engine rotation speed sensor configured to output a signal indicative of an actual rotation speed of the engine;an accelerator operating member;an accelerator operation sensor configured to output a signal indicative of an operation amount of the accelerator operating member; and determine a target rotation speed of the engine from the operation amount of the accelerator operating member,', 'determine whether the vehicle is in coasting deceleration, and', a deviation between the actual rotation speed of the engine and the target rotation speed, or', 'the operation amount of the accelerator operating member when the vehicle is in the coasting deceleration., 'decrease a differential pressure between the first circuit and the second circuit in accordance with'}], 'a controller configured to receive a signal from the engine rotation speed sensor and a ...

METHODS AND SYSTEMS FOR OPERATING A DRIVELINE OF A HYBRID ENGINE POWERTRAIN

Methods and systems are provided for adjusting clutch pressures and electric machine torques as a function of a stability metric threshold(s) in order to balance performance and charging of an onboard energy storage device. In one example, a method comprises during an upshift of a transmission from a first gear to a second gear, adjusting a clutch pressure of the transmission to adjust slippage of a clutch in response to a vehicle stability control parameter exceeding a threshold. In this way, torque delivered to a transmission output shaft may be reduced, which may increase vehicle stability. 1. A driveline operating method , comprising:during an upshift of a transmission from a first gear to a second gear, adjusting a clutch pressure of the transmission to adjust slippage of a clutch in response to a vehicle stability control parameter exceeding a threshold.2. The method of claim 1 , where the vehicle stability control parameter is an estimate of vehicle yaw.3. The method of claim 1 , where the vehicle stability control parameter is an estimate of vehicle roll.4. The method of claim 1 , where the vehicle stability control parameter is an estimate of vehicle lateral acceleration.5. The method of claim 1 , where the clutch transfers torque to the second gear during the upshift claim 1 , and further comprising:transferring torque to a third gear via the clutch.6. The method of claim 1 , further comprising decreasing slip time of the clutch in response to the vehicle stability control parameter not exceeding the threshold and the vehicle stability control parameter decreasing from the threshold.7. The method of claim 1 , further comprising adjusting slippage of the clutch in further response to battery state of charge.8. The method of claim 1 , further comprising adjusting engine torque via spark timing in response to the vehicle stability control parameter exceeding the threshold.9. A driveline operating method claim 1 , comprising:during an upshift of a transmission ...

Method for Controlling a Hydrostatic Drive

A method is used to control a hydrostatic drive including a drive machine, a hydraulic pump coupled to the drive machine, and a hydraulic motor coupled to the hydraulic pump via a hydraulic working circuit. In the method, at least one of multiple manipulated variables of the hydrostatic drive is ascertained and set, in the course of a precontrol, from a specified setpoint value for at least one of the controlled variables, including a pressure in the hydraulic working circuit, a speed of the hydraulic pump, and an output variable of the hydrostatic drive. In the method, the remaining controlled variables and/or manipulated variables are automatically updated.

CONTROL SYSTEM FOR HYDRAULICALLY POWERED AC GENERATOR

Systems and methods for use in controlling a hydraulically powered AC generator are provided. One control system includes a valve system. The valve system includes a fixed valve configured to provide a substantially constant flow rate of the fluid through the fixed valve to the hydraulically powered AC generator. The valve system further includes a variable valve configured to provide a variable flow rate of the fluid through the variable valve to the hydraulically powered AC generator. The control system further includes a sensor device configured to measure a speed of movement of a component of the hydraulically powered AC generator. The control system further includes a control circuit configured to control the variable flow rate of the variable valve based on the speed of movement of the component measured by the sensor device. 119-. (canceled)20. A control system for controlling an alternating current (AC) generator , the control system comprising:a sensor device configured to measure a speed of movement of a gear or shaft of the AC generator; anda control circuit configured to generate a control signal based on the speed of movement of the AC generator measured by the sensor device, wherein the control circuit is further configured to transmit the control signal to a control device configured to control a hydraulic motor coupled to drive the AC generator.21. The control system of claim 20 , wherein the hydraulic motor is controlled by a valve system.22. The control system of claim 20 , wherein the sensor device comprises a Hall Effect sensor configured to measure a change in a magnetic field caused by the movement of the AC generator.23. The control system of claim 20 , wherein the sensor device comprises an optical encoder sensor claim 20 , the optical encoder sensor comprising a light source configured to generate light and a light detection device configured to detect changes in the light reflected off of the AC generator.24. The control system of claim 20 ...

GEAR SHIFTING APPARATUS FOR MULTI-SPEED TRANSMISSION FOR ELECTRIC VEHICLES

A gear shifting apparatus for a multi-speed transmission includes: a shifting unit controlling gear shifting by a torque of an actuator; and a parking unit controlling a parking state by the torque of the actuator. In particular, the actuator includes a control motor transmitting a driving torque to a first driven gear of the shifting unit and a second driven gear of the parking unit through a drive gear externally gear-meshed with the driven gears, and the shifting unit includes: a fork slider slidably mounted on a fork rail, a shift fork integrally formed with the fork slider, a cam block connected to the first driven gear engaged with the drive gear and having a cam surface on an exterior circumference for shift-stages, a cam contact pin integrally formed with the fork slider and contacting the cam surface, and a return spring mounted around the fork rail. 1. A gear shifting apparatus for a multi-speed transmission for an electric vehicle , comprising:a shifting unit configured to control gear shifting by a torque of an actuator; anda parking unit including a parking gear and configured to control engagement and disengagement of the parking gear by the torque of the actuator,wherein the actuator comprises a control motor transmitting a driving torque to a first driven gear of the shifting unit and a second driven gear of the parking unit through a drive gear externally gear-meshed with the first and second driven gears, a fork slider slidably mounted on a fork rail;', 'a shift fork integrally formed with the fork slider and configured to activate the gear shifting;', 'a cam block connected to the first driven gear externally engaged with the drive gear, wherein the cam block includes a cam surface on an exterior circumference thereof for shift-stages;', 'a cam contact pin integrally formed with the fork slider and contacting the cam surface formed on an exterior circumference of the cam block; and', 'a return spring mounted around the fork rail and abutting the ...

HYDROSTATIC DRIVE SYSTEM

A hydrostatic drive system for a machine is disclosed. The hydrostatic drive system includes a pump, a hydraulic motor configured to receive a pressurized fluid from the pump and a controller operably connected to the pump and the hydraulic motor. The controller is configured to receive an input signal indicative of a current machine speed and a desired machine speed. Further, the controller is configured to output a motor displacement command signal and a pump displacement command signal to adjust a displacement of the hydraulic motor and the pump respectively based on the input signal to maintain at least one of constant machine speed or constant acceleration or constant deceleration during adjustment of the pump displacement and the motor displacement. 1. A hydrostatic drive system for a machine comprising:a pump;a hydraulic motor configured to receive a pressurized fluid from the pump; anda controller operably connected to the pump and the hydraulic motor, the controller configured to:receive an input signal indicative of a current machine speed and a desired machine speed; andoutput a motor displacement command signal and a pump displacement command signal to selectively adjust a motor displacement of the hydraulic motor and a pump displacement of the pump based on the input signal to maintain at least one of constant machine speed or constant acceleration or constant deceleration during adjustment of the pump displacement and the motor displacement.2. The hydrostatic drive system of claim 1 , wherein the hydraulic pump is a variable displacement pump.3. The hydrostatic drive system of claim 1 , wherein the hydraulic motor is a two-speed motor.4. The hydrostatic drive system of claim 1 , wherein the controller is configured to determine an acceleration mode claim 1 , during the acceleration mode desired machine speed is greater than the current machine speed.5. The hydraulic drive system of claim 4 , wherein during the acceleration mode claim 4 , the controller ...

Gear shifting apparatus for multi-speed transmission for electric vehicles

A gear shifting apparatus for a multi-speed transmission includes: a shifting unit controlling gear shifting by a torque of an actuator; and a parking unit controlling a parking state by the torque of the actuator. In particular, the actuator includes a control motor transmitting a driving torque to driven gears of the shifting and parking units through a drive gear, and the shifting unit includes: a fork slider slidably mounted on a fork rail; a shift fork integrally formed with the fork slider; a finger drum connected to a first driven gear engaged with the drive gear, and having a finger end; and a shift lug that rotates about a lug shaft and includes two lug ends having a different length from each other. The shift lug interacts with the finger end, and has a coupler end coupled with a pocket portion formed at the fork slider.

Hydrostatic Transmission Assembly and System

A hydrostatic transmission system includes a hydraulic motor and at least one proportional control valve and at least one pump connected to the hydraulic motor to provide fluid to operate the hydraulic motor. The at least one pump includes at least one fluid driver having a prime mover and a fluid displacement assembly to be driven by the prime mover such that fluid is transferred from the pump inlet to the pump outlet. The hydrostatic transmission system also includes a controller that establishes at least one of a speed and a torque of the at least one prime mover and concurrently establishes an opening of the at least one proportional control valve to adjust at least one of a flow and a pressure in the hydrostatic transmission system to an operational set point. 152.-. (canceled)53. A hydraulic system comprising:a hydraulic motor;a hydraulic pump assembly connected to the hydraulic motor, the hydraulic pump assembly including a hydraulic pump having a first fluid driver with a first variable torque motor and a first gear having a plurality of first gear teeth, and a second fluid driver with a second variable torque motor and a second gear having a plurality of second gear teeth; and receive feedback data from each variable torque motor,', 'control a torque of each variable torque motor to transfer the hydraulic fluid to the hydraulic motor, and', 'synchronize rotation rates to generate a contact force between the first and second gears of the hydraulic pump., 'a controller that is configured to54. The hydraulic system of claim 53 , wherein the synchronization rate is in a range of 99.0% to 100%.55. The hydraulic system of claim 53 , wherein the synchronization rate is in a range of 99.5% to 100%.56. The hydraulic system of claim 53 , wherein the controller includes one or more curves for the hydraulic pump that convert command signals to appropriate torque demand signals to the hydraulic pump based on the design of the hydraulic pump.57. The hydraulic system of ...

Control device and control method for construction machine

The present disclosure relates to a control device and a control method for a construction machine. The control device and the control method for the construction machine according to the exemplary embodiment of the present disclosure may adjust an engine revolutions per minute (rpm) according to a load applied to the construction machine, thereby controlling an output of equipment. In the control device and the control method for the construction machine according to the exemplary embodiment of the present disclosure, an output of a pump is increased at an appropriate time, so that good operation performance may be maintained, and in the case of an operation pattern, in which a load is low, the engine rpm is adjusted to be decreased, thereby improving fuel efficiency.

POWER SPLIT TRANSMISSION AND METHOD FOR OPERATING SUCH POWER SPLIT TRANSMISSION

A power-split transmission which is designed to be operated with either first or second deceleration logics. The second deceleration logic has a higher deceleration dynamic than the first deceleration logic, and is designed to disengage an engaged range clutch immediately so as to reduce the transmission ratio by way of a hydrostatic unit with a maximum dynamic. A method of operating the transmission includes: monitoring various vehicle parameters while the vehicle is operated with the first deceleration logic; detecting that at least one set limit value has been exceeded while the vehicle operated with the first deceleration logic; activating the second deceleration logic, to immediately disengage an engaged range clutch; reducing a transmission ratio to a maximum using the hydrostatic unit, the hydrostatic unit being displaced with a maximum dynamic; and engaging the range clutch and activating the first deceleration logic. 112-. (canceled).1311231. A power-split transmission device () for a vehicle , the transmission device () connecting a drive engine () , arranged on an input side , to a drive output () , arranged on an output side , and the transmission device () comprising:{'b': '4', 'a hydrostatic unit () for the continuous adjustment of a transmission ratio;'}{'b': 5', '5', '5', '1', '3, 'i': a,', 'b,', 'c, 'at least one range clutch () for coupling the transmission device ()to the drive output (); and'}{'b': 1', '5', '5', '5', '4, 'i': a,', 'b,', 'c, 'the transmission device () being designed to be operated with a first and a second deceleration logic such that the second deceleration logic has a higher deceleration dynamic than the first deceleration logic, and such that the second deceleration logic being designed so as to immediately disengage the at least one range clutch (), when the at least one range clutch is engaged, in order to reduce the transmission ratio of the hydrostatic unit () with a maximum dynamic.'}1415554a,b,c. The transmission device ...

Hydrostatic Transmission Assembly and System

A hydrostatic transmission system includes a fluid-driven motor and an integrated pump assembly connected to the fluid-driven motor to provide fluid to operate the fluid-driven motor. The integrated pump assembly includes a pump with at least one fluid driver comprising a prime mover and a fluid displacement assembly to be driven by the prime mover such that fluid is transferred from a first port of the pump to a second port of the pump. The pump assembly also includes two valve assembles to isolate the pump from the system. The hydrostatic transmission system also includes a controller that establishes at least one of a speed and a torque of the at least one prime mover to exclusively adjust at least one of a flow and a pressure in the hydrostatic transmission system to an operational set point. 133.-. (canceled)34. A hydraulic system comprising:a hydraulic motor; a first fluid driver with a first variable torque motor and a first gear having a plurality of first gear teeth, and', 'a second fluid driver with a second variable torque motor and a second gear having a plurality of second gear teeth; and, 'a hydraulic pump connected to the hydraulic motor, the hydraulic pump to provide hydraulic fluid to operate the hydraulic motor, the hydraulic pump including,'}a controller that establishes a torque of the hydraulic pump to exclusively adjust at least one of a flow or a pressure in the hydraulic system.35. The hydraulic system of claim 34 , wherein the controller synchronizes rotation rates between the first and second gears to generate a contact force between the first and second gears of the hydraulic pump.36. The hydraulic system of claim 35 , wherein the synchronization rate is in a range of 99.0% to 100%.37. The hydraulic system of claim 35 , wherein the synchronization rate is in a range of 99.5% to 100%.38. The hydraulic system of claim 34 , wherein the controller includes one or more curves for the hydraulic pump that convert command signals to appropriate ...

Hydrostatic Transmission Assembly and System

A hydrostatic transmission system includes a hydraulic motor and at least one proportional control valve and at least one pump connected to the hydraulic motor to provide fluid to operate the hydraulic motor. The at least one pump includes at least one fluid driver having a prime mover and a fluid displacement assembly to be driven by the prime mover such that fluid is transferred from the pump inlet to the pump outlet. The hydrostatic transmission system also includes a controller that establishes at least one of a speed and a torque of the at least one prime mover and concurrently establishes an opening of the at least one proportional control valve to adjust at least one of a flow and a pressure in the hydrostatic transmission system to an operational set point. 1. A hydraulic system comprising:a hydraulic motor having first and second ports; a hydraulic pump having a casing defining an interior volume, the casing having an inlet port in fluid communication with the interior volume, and an outlet port in fluid communication with the interior volume, the hydraulic pump having at least one fluid driver disposed inside the interior volume, each fluid driver having at least one of a variable-speed and a variable torque motor, and', 'a control valve assembly comprising a control valve in fluid communication with the hydraulic motor; and, 'a hydraulic pump assembly conjoined with the hydraulic motor, the hydraulic pump assembly to provide hydraulic fluid to operate the hydraulic motor, the hydraulic pump assembly including,'}a controller that establishes at least one of a speed and a torque of the hydraulic pump so as to maintain at least one of a flow in the hydraulic system at a flow set point and a pressure in the hydraulic system at a pressure set point and concurrently establishes an opening of the control valve so as to maintain at least one of the flow in the hydraulic system at the flow set point and the pressure in the hydraulic system at the pressure set ...

VARIABLE DISPLACMENT HYDRAULIC PUMP WITH TORQUE SENSING AND METHOD THEREOF

A pump, including: a cylinder block including two through-bores and two pistons disposed in the through-bores; a drive shaft to rotate the cylinder block; a swash plate to displace the pistons within the through-bores to draw fluid through an inlet port into the through-bores; and expel the fluid from the through-bores into the outlet port; a torque sensor arranged to measure torque on the drive shaft and transmit a torque signal, including the measured torque, to a processor; and an actuator to receive, from the processor, a control signal generated using the torque signal and pivot the swash plate about a first axis, transverse to the axis of rotation, or maintain a circumferential position of the swash plate about the first axis; or pivot the cylinder block about a second axis, transverse to the axis of rotation, or maintain a circumferential position of the cylinder block about the second axis. 1. A variable displacement hydraulic pump , comprising:an inlet port;an outlet port; first and second through-bores; and,', 'first and second pistons at least partly disposed in the first and second through-bores, respectively;, 'a cylinder block includinga drive shaft arranged to rotate the cylinder block;an axis of rotation for the drive shaft; draw fluid through the inlet port into the first and second through-bores; and', 'expel the fluid from the first and second through-bores into the outlet port;, 'a swash plate engaged with the first and second pistons and arranged to displace the first and second pistons within the first and second through-bores, respectively, to measure torque on the drive shaft; and,', 'transmit a torque signal, including the measured torque, to a processor; and,, 'a torque sensor arranged to pivot the swash plate about a first axis, transverse to the axis of rotation for the drive shaft, or maintain a circumferential position of the swash plate about the first axis; or,', 'pivot the cylinder block about a second axis, transverse to the axis of ...

A turbine driven electric power production system and a method for control thereof

A turbine (2) driven electric power production system (1), - said turbine (2) arranged for being driven by a fluid (3) having a fluid speed (v) varying in time, - said turbine (2) connected to a hydrostatic displacement pump (6) further connected to a hydrostatic displacement motor (8) as part of a closed loop hydrostatic transmission system (7), - said motor (8) arranged for driving an electrical generator (9) supplying AC power (10) at a frequency (fg) near a given desired frequency (fdes), characterized by a closed loop system arranged for controlling a volumetric displacement (13) of the hydrostatic motor (8), comprising - a fluid speed meter (11m) arranged for producing a speed signal (11s) representing a speed (v) of said fluid (3), and - a rotational speed meter (12m) arranged for providing a rotational speed signal (12s) representing a rotational speed measurement (ω) of said turbine (2), - a motor displacement control system (15) for continuously receiving said speed signal (11s) and said rotational speed signal (12s) and arranged for calculating a control signal (16), - a volumetric displacement control actuator (17) on said hydrostatic motor, arranged for receiving said control signal (16) for continuously adjusting a volumetric displacement (d) of said hydrostatic motor (8) for maintaining a set turbine tip speed ratio (tsrset) and thereby providing an improved power efficiency of the power production system (1) during fluctuations in said fluid speed (v).

Device for adjustment of the delivery rate of a hydraulic pump

Work vehicle and method for controlling work vehicle

【課題】本発明の目的は、作業車両においてエンジンが低回転速度で制御されることにより燃費を向上させながら、操作性の低下を抑えることにある。【解決手段】コントローラは、エンジンの回転速度と油圧ポンプの容量とを制御する。コントローラは、牽引力の減少に応じてエンジンの回転速度を低速側に変化させる。【選択図】図８

Hydraulic drive

Control device for HST hydraulic traveling vehicle

control system of variable line pressure for an automatic transmission

본 발명은 자동 변속기의 라인압 가변제어장치에 관한 것으로, 주행중 현재의 변속단과 무관하게 현재의 차속과 스로틀 개도에 따라 오일 펌프로부터 토출되어 레귤레이터 밸브에 의해 조압되는 라인압의 정도를 조절하도록 하여 엔진으로부터 생성되는 구동력중 오일 펌프의 작동에 소요되는 부분을 줄여 구동 손실을 최소화함과 더불어, 이로 인한 차량의 연비 향상을 도모할 수 있도록 하는 데 그 목적이 있다. The present invention relates to a variable line pressure control device of an automatic transmission, and to adjust the degree of the line pressure discharged from the oil pump according to the current vehicle speed and the throttle opening while being regulated by the regulator valve irrespective of the current shift stage during driving. The purpose of the present invention is to minimize the driving loss by reducing the portion of the driving force generated from the oil pump and to improve the fuel efficiency of the vehicle. 전술한 목적을 달성하기 위해 본 발명은, 오일 펌프(12)로부터 유량을 받아 소정 수준의 유압으로 조압하는 레귤레이터 밸브(14)와, 이 레귤레이터 밸브(14)로부터 조압되는 라인압의 수준을 운전 조건에 따라 가변적으로 조절하도록 변속 제어 유니트(TCU)의 제어를 받아 가변적인 크기의 신호압을 출력하는 비례 제어 솔레노이드 밸브(52)를 포함하는 자동 변속기의 라인압 가변제어장치에 있어서, 상기 비례 제어 솔레노이드 밸브(52)에는 레귤레이터 밸브(14)로부터 조압된 라인압을 송출하는 메인 관로(ML)로부터 분기된 라인압 인가 관로(LI)와, 상기 레귤레이터 밸브(14)의 일측 반력실(15)에 제어된 신호압을 송출하는 신호압 인가 관로(LO)가 구비되고, 상기 신호압 인가 관로(LO)상에는 비례 제어 솔레노이드 밸브(52)측으로 제어압을 리턴시켜 상기 레귤레이터 밸브(14)의 반력실(15)로 공급되는 신호압을 안정화시키도록 하는 보조 관로(LO')가 설치되며, 이 보조 관로(LO')에는 비례 제어 솔레노이드 밸브(52)로부터 제어되어 레귤레이터 밸브(14)의 반력실(15)로 공급되도록 제어된 신호압에 대한 떨림을 방지하기 위한 오리피스(Or)가 설치된 것을 특징으로 한다. In order to achieve the above object, the present invention provides a regulator valve 14 that receives a flow rate from the oil pump 12 and regulates hydraulic pressure at a predetermined level, and a level of line pressure regulated by the regulator valve 14. The line pressure variable control device of an automatic transmission comprising a proportional control solenoid valve 52 for outputting a signal pressure of a variable magnitude under the control of a transmission control unit (TCU) to variably adjust according to the above. The valve 52 is controlled to the line pressure application pipe line LI branched ...

Pressure control device for variable capacity pump

A pressure override control which utilizes pump output flow for destroking of a variable displacement pump to minimize loss of power and generation of heat and which includes modifications to the displacement control valve for the pump and, particularly, the cross connection of displacement-controlling servo motors when the displacement control valve is in a neutral position with blocking of communication of said servo motors to a displacement control pressure and drain whereby the pump cannot be positioned in a maximum displacement position in response to certain system malfunctions in the power override control circuitry.

DRIVING DEVICE FOR CAR

1. Приводное устройство для автомобиля, с двигателем (1), механической основной линией трансмиссии (2) и гидравлической дополнительной линией трансмиссии (3), причем гидравлическая дополнительная линия трансмиссии (3) располагает гидравлическим контуром (11) с регулируемым гидростатическим насосом (7) и гидродвигателем (9, 10), и регулируемый гидравлический насос (7) можно приводить в движение посредством дополнительного отбора мощности (8) двигателя (1), отличающееся тем, что между насосом (7) и дополнительным отбором мощности (8) размещено сцепление (17).2. Приводное устройство по п.1, отличающееся тем, что сцепление (17) выполнено в виде кулачковой муфты.3. Приводное устройство по п.1, отличающееся тем, что сцепление (17) выполнено в виде сцепной муфты (17) с синхронизацией.4. Приводное устройство по одному из предшествующих пунктов, отличающееся тем, что насос (7) выполнен как аксиально-поршневой насос.5. Приводное устройство по одному из пп.1-3, отличающееся тем, что гидравлический контур (11) оснащен промывочным насосом (12).6. Приводное устройство по одному из пп.1-3, отличающееся тем, что между дополнительным отбором мощности (8) двигателя (1) и насосом (7) размещен гаситель крутильных колебаний (18).7. Способ эксплуатации приводного устройства для автомобиля, с двигателем (1), механической основной линией трансмиссии (2) и гидравлической дополнительной линией трансмиссии (3), причем гидравлическая дополнительная линия трансмиссии (3) располагает гидравлическим контуром (11) с регулируемым гидростатическим насосом (7) и гидродвигателем (9, 10), и регулируемый гидравлический насос (7) можно приводить в движение посредством дополнительного отбора мо� РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2012 142 505 A (51) МПК B60K 17/02 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2012142505/11, 07.12.2010 (71) Заявитель(и): ДАЙМЛЕР АГ (DE) Приоритет(ы): (30) Конвенционный приоритет: 06.03.2010 DE 102010010473.6 ...

Controlling valve

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Control device for hydraulic traveling vehicle

Method for driving a drive train of a vehicle and device for carrying out the method

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Ansteuern eines Fahrzeuges, insbesondere dem Antriebsstrang einer Verdichtungsmaschine für den Erdbau, mit einer hydraulischen Fahrpumpe und einem hydraulischen Fahrmotor. Die Steuerung erfolgt nach einem vorgegebenen Steuerungsprofil, wenn ein vorgegebener Fahrbetrieb vorliegt, indem ein von der Drehzahl des Verbrennungsmotors unabhängige Verstellung der Fahrpumpe erzeugt wird. Dadurch ist es möglich, einerseits bei kurzzeitig auftretenden Fahrstopps oder Fahrtrichtungswechseln die Drehzahl des Verbrennungsmotors beizubehalten und andererseits bei etwas länger andauernden Pausen zwischen zwei Veränderungen des Fahrverhaltens die Motordrehzahl anzupassen, wobei größere Drehzahlschwankungen vermieden werden. The invention relates to a method and a device for driving a vehicle, in particular the drive train of a compaction machine for earthworks, with a hydraulic drive pump and a hydraulic traction motor. The control takes place according to a predetermined control profile when a predetermined driving operation is present by an independent of the speed of the engine adjustment of the driving pump is generated. This makes it possible, on the one hand to maintain the engine speed for short-term stops or changes of direction and on the other hand adjust the engine speed at slightly longer pauses between two changes in driving behavior, with larger speed fluctuations are avoided.

Hydraulic transmission for fork lift truck - has variable pump and electronic control of transmission ratio

The vehicle IC engine transmission has a variable angle hydrostatic pump and several hydrostatic motors. Hydraulic pressures are monitored in the pump and in the motors. The motors are mounted near the wheels and can act as retarders. An electronic controller regulates the pump setting w.r.t. the vehicle speed, and system pressures. Increasing system pressure reduces the pump setting and hence increases the transmission ratio. Lifting of the throttle pedal setting introduces a retardation effect with reduced strain on the mechanical brakes. The application of the brakes also enhances the retardation, with the retardation proportional to the brake setting. ADVANTAGE - Improved control, reduced brake wear. Reduced engine loading, avoiding stalling of engine.

Overspeed control for a hydrostatic transmission

An overspeed control for a hydrostatic transmission of a mobile machine includes a speed control valve arrangement connected to a fixed displacement pump through a supply line and to a pressure responsive displacement controller of a variable displacement hydraulic pump of the transmission. An overspeed control valve is connected to the supply line and is operative for reducing the fluid pressure level in the displacement controller when the speed control valve arrangement is in an operative position and the rotational speed of the engine exceeds a predetermined level. This reduces the displacement of the variable displacement pump (which acts as a motor in a downhill situation) and thus increasing engine retarding and transmission losses for preventing the positive grade from accelerating the machine, engine and/or the components of the hydrostatic transmission to speeds exceeding their designed limits.

Underspeed control system for a hydromechanical drive system and method of operating same

An apparatus for controlling load on an engine is disclosed. The apparatus includes a continuously variable transmission driven by the engine. The apparatus further includes an engine speed sensor being adapted to sense the output speed of the engine and produce an engine speed signal indicative of the engine output speed and a travel speed sensor being adapted to sense the travel speed of the machine and produce a travel speed signal indicative of the machine travel speed. The apparatus yet further includes an electronic controller operable to compare the engine speed signal to an underspeed value and produce an integral error signal indicative of the difference between the engine speed signal and the underspeed value, supply an integral gain value based on the machine travel speed, modify the integral error signal through a proportional plus integral feedback controller to produce an underspeed request signal, and produce a command signal based on the underspeed request signal. The command signal is used to control the transmission ratio of the continuously variable transmission so as to control the load on the engine. A method for controlling a load on an engine associated with a continuously variable transmission is also disclosed.

Control system and method for braking a hydrostatic drive machine

Verfahren zum Bremsen einer Maschine (10) mit hydrostatischem Antrieb, mit folgenden Schritten: Verringern einer Verdrängung einer Pumpe (18) eines hydrostatischen Antriebssystems (14) auf eine Verdrängung ungleich Null; Erhöhen einer Verdrängung eines Motors (22) des hydrostatischen Antriebssystems (14) auf eine Verdrängung, die weniger als eine maximale Verdrängung beträgt; und Beschleunigen einer Brennkraftmaschine (20) des hydrostatischen Antriebssystems (14) in Richtung eines gewünschten Brennkraftmaschinendrehzahlbereichs.

Method for controlling a transmission ratio

Die Erfindung betrifft ein Verfahren zur Steuerung eines Übersetzungsverhältnisses (tau) eines stufenlos verstellbaren Getriebes (3). Es wird eine Fahrpedalstellung und eine Ist-Fahrgeschwindigkeit (nu<SUB>ist</SUB>) erfasst. Unter Berücksichtigung der Ist-Fahrgeschwindigkeit (nu<SUB>ist</SUB>) und der Fahrpedalstellung (alpha<SUB>Pedal</SUB>) wird ein Übersethzungsgradient ermittelt. Ein Übersetzungsollwert als Summe eines Ist-Übersetzungsverhältnisses (tau<SUB>ist</SUB>) und eines Übersetzungsänderungswerts $F1 wird ermittelt und das stufenlos verstellbare Getriebe (3) darauf eingestellt. The invention relates to a method for controlling a transmission ratio (tau) of a continuously variable transmission (3). An accelerator pedal position and an actual driving speed (nu <SUB> is </ SUB>) are detected. Taking into account the actual driving speed (nu <SUB> is </ SUB>) and the accelerator pedal position (alpha <SUB> pedal </ SUB>), a transfer gradient is determined. A gear setpoint as the sum of an actual gear ratio (tau <SUB> is </ SUB>) and a speed change value $ F1 is detected and the continuously variable transmission (3) is set thereon.

Method for limiting load control of a hydrostatic drive system

Die Erfindung betrifft ein Verfahren zur Grenzlastregelung (GR) eines hydrostatischen Antriebssystems (1), insbesondere eines hydrostatischen Fahrantriebs, das eine von einem Antriebsmotor (M) angetriebene hydrostatische Pumpe (P), die im Fördervolumen (VP) verstellbar ist, und zumindest einen im geschlossenen Kreislauf mit der Pumpe (P) verbundenen hydrostatischen Motor (HM), der im Schluckvolumen (VHM) verstellbar ist, umfasst, wobei in einem ersten Getriebeübersetzungsbereich (GB1) des hydrostatischen Antriebssystems (1) der Motor (HM) auf maximales Schluckvolumen (VHMmax) eingestellt ist und die Pumpe (P) ausgehend von einer Stellung mit minimalem Fördervolumen (VPmin) auf eine Stellung mit maximalem Fördervolumen (VPmax) verstellt wird, und in einem zweiten Getriebeübersetzungsbereich (GB2) des hydrostatischen Antriebssystems (1), der sich an den ersten Getriebeübersetzungsbereich (GB1) anschließt, die Pumpe (P) auf maximales Fördervolumen (VPmax) eingestellt ist und der Motor (HM) ausgehend von einer Stellung mit maximalem Schluckvolumen (VHMmax) auf eine Stellung mit minimalem Fördervolumen (VHMmin) verstellt wird. Bei einer Drehzahldrückung des Antriebsmotors (M) in dem zweiten Getriebeübersetzungsbereich (GB2) wird die Schluckvolumeneinstellung (VHM) des Motors (HM) von der Grenzlastregelung (GR) beeinflusst. The invention relates to a method for limiting load regulation (GR) of a hydrostatic drive system (1), in particular a hydrostatic drive, which has a hydrostatic pump (P) driven by a drive motor (M), which is adjustable in the delivery volume (VP), and at least one closed circuit with the pump (P) connected hydrostatic motor (HM), which is adjustable in the displacement (VHM) comprises, wherein in a first gear ratio range (GB1) of the hydrostatic drive system (1) of the motor (HM) to maximum displacement (VHMmax ) is adjusted and the pump (P) from a position with minimum delivery volume (VPmin) is adjusted to a position with maximum delivery volume ( ...

Drive transmission for construction vehicle

The drive has a motor (24) with a feed pump (25) and a hydrostatic compensating pump (2). The compensating pump (1) is non-reciprocating and the feed volume is controlled by the pilot and main pressures so that the transmitted rotary force during gear changes in minimised. The adjusted position is retained by a balances return spring (9).

Hydraulic transmission vehicle

A vehicle provided with a hydraulic transmission (21) capable of changing an output/input rotation speed ratio by means of an electronically-controlled actuator (86), wherein a control device (90) for the actuator stores an instruction current value on the assumption that no load is applied to the hydraulic transmission, the difference between an actual instruction current value to the actuator and the stored instruction current value is calculated to thereby calculate a load applied to the hydraulic transmission, and the instruction current value is corrected based on the load to feedback-control the actuator. The vehicle is provided with a differential mechanism (10) for synthesizing the torques of the input shaft and output shaft of the hydraulic transmission, the rotation speed of the main transmission shaft (27) as the output shaft is detected by a detector (82), the actuator is correction-controlled when the rotation speed is different from the target rotation speed of the shaft (27) determined according to the operation of a transmission operating element, and the correction is calculated as a load applied to the hydraulic transmission.

Switching device for a hydraulic-mechanical drive

Hydromechanical travelling mechanism

The invention relates to a travelling mechanism, comprising a driving motor (24) which drives a feed pump (25) and a hydrostatic variable displacement pump (2), a zero fluctuating hydrostatic variable displacement motor (1) which forms a hydrostatic circuit with the hydrostatic variable displacement pump (2), and a hydrostatically driven 2-speed gear mechanism (11) which is switched when the torque to be transmitted is minimal and the hydrostatic variable displacement motor (1) is at zero absorption volume.

Hydromechanical traveling mechanism

A traveling mechanism having a driving motor ( 24 ) which drives a feed pump ( 25 ) and a hydrostatic variable displacement pump ( 2 ), a zero fluctuating hydrostatic variable displacement motor ( 1 ) which forms with the hydrostatic variable displacement pump ( 2 ) a hydrostatic circuit and a hydrostatically driven 2-speed gear mechanism ( 11 ) which is engaged when the torque to be transmitted is minimal and the hydrostatic variable displacement motor ( 1 ) is at zero displacement capacity.

Shift control for transmission

Switching device for setting the ratio of a hydrostatic-mechanical compound transmission

A multi-mode hydromechanical transmission shift system having a hydrostatic unit with at least one variable and reversible displacement component with a displacement control, a plurality of clutches independently operable for setting the mode of operation of the transmission and a control circuit including a plurality of valves for setting the mode of operation and responsive to the position of the displacement control for causing a shift in operation from one clutch to the other to change the mode of operation.

4-wheel driving car

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

A turbine driven electric power production system and a method for control thereof

A turbine (2) driven electric power production system (1), - said turbine (2) arranged for being driven by a fluid (3) having a fluid speed (v) varying in time, - said turbine (2) connected to a hydrostatic displacement pump (6) further connected to a hydrostatic displacement motor (8) as part of a closed loop hydrostatic transmission system (7), - said motor (8) arranged for driving an electrical generator (9) supplying AC power (10) at a frequency (fg) near a given desired frequency (fdes), characterized by a closed loop system arranged for controlling a volumetric displacement (13) of the hydrostatic motor (8), comprising - a fluid speed meter (11m) arranged for producing a speed signal (11s) representing a speed (v) of said fluid (3), and - a rotational speed meter (12m) arranged for providing a rotational speed signal (12s) representing a rotational speed measurement (ω) of said turbine (2), - a motor displacement control system (15) for continuously receiving said speed signal (11s) and said rotational speed signal (12s) and arranged for calculating a control signal (16), - a volumetric displacement control actuator (17) on said hydrostatic motor, arranged for receiving said control signal (16) for continuously adjusting a volumetric displacement (d) of said hydrostatic motor (8) for maintaining a set turbine tip speed ratio (tsrset) and thereby providing an improved power efficiency of the power production system (1) during fluctuations in said fluid speed (v).

Turbine driven electric power production system and a method for control thereof

A turbine ( 2 ) driven electric power production system ( 1 ),—said turbine ( 2 ) arranged for being driven by a fluid ( 3 ) having a fluid speed (v) varying in time,—said turbine ( 2 ) connected to a hydrostatic displacement pump ( 6 ) further connected to a hydrostatic displacement motor ( 8 ) as part of a closed loop hydrostatic transmission system ( 7 ),—said motor ( 8 ) arranged for driving an electrical generator ( 9 ) supplying AC power ( 10 ) at a frequency (f g ) near a given desired frequency (f des ), characterized by a closed loop system arranged for controlling a volumetric displacement ( 13 ) of the hydrostatic motor ( 8 ), comprising—a fluid speed meter ( 11 m ) arranged for producing a speed signal ( 11 s ) representing a speed (v) of said fluid ( 3 ), and—a rotational speed meter ( 12 m ) arranged for providing a rotational speed signal ( 12 s ) representing a rotational speed measurement (ω) of said turbine ( 2 ), —a motor displacement control system ( 15 ) for continuously receiving said speed signal ( 11 s ) and said rotational speed signal ( 12 s ) and arranged for calculating a control signal ( 16 ), —a volumetric displacement control actuator ( 17 ) on said hydrostatic motor, arranged for receiving said control signal ( 16 ) for continuously adjusting a volumetric displacement (d) of said hydrostatic motor ( 8 ) for maintaining a set turbine tip speed ratio (tsr set ) and thereby providing an improved power efficiency of the power production system ( 1 ) during fluctuations in said fluid speed (v).

A turbine driven electric power production system and a method for control thereof

A turbine (2) driven electric power production system (1), - said turbine (2) arranged for being driven by a fluid (3) having a fluid speed (v) varying in time, - said turbine (2) connected to a hydrostatic displacement pump (6) further connected to a hydrostatic displacement motor (8) as part of a closed loop hydrostatic transmission system (7), - said motor (8) arranged for driving an electrical generator (9) supplying AC power (10) at a frequency (fg) near a given desired frequency (fdes), characterized by a closed loop system arranged for controlling a volumetric displacement (13) of the hydrostatic motor (8), comprising - a fluid speed meter (11m) arranged for producing a speed signal (11s) representing a speed (v) of said fluid (3), and - a rotational speed meter (12m) arranged for providing a rotational speed signal (12s) representing a rotational speed measurement (.omega.) of said turbine (2), - a motor displacement control system (15) for continuously receiving said speed signal (11s) and said rotational speed signal (12s) and arranged for calculating a control signal (16), - a volumetric displacement control actuator (17) on said hydrostatic motor, arranged for receiving said control signal (16) for continuously adjusting a volumetric displacement (d) of said hydrostatic motor (8) for maintaining a set turbine tip speed ratio (tsrset) and thereby providing an improved power efficiency of the power production system (1) during fluctuations in said fluid speed (v).

A turbine driven electric power production system and a method for control thereof

A turbine driven electric power production system and a method for control thereof are proposed. The system comprises a turbine (2) arranged for being driven by a fluid (3) having a fluid speed (v) varying in time, said turbine (2) connected to a hydrostatic displacement pump (6) further connected to a hydrostatic displacement motor (8) as part of a closed loop hydrostatic transmission system. The electric power production system (1) comprises a loop control system (15, 15a) further arranged for continuously receiving a speed signal (11) representing the speed (v) of said fluid, and also continuously receiving a turbine rotational speed signal (12m) representing calculating a control signal (16) for a volumetric displacement control actuator (17) for continuously adjusting a volumetric displacement (d) of said hydrostatic motor (8), for enabling to maintain a set turbine tip speed ratio (tsr) and thereby achieving an improved power efficiency of the power production system (1) during fluctuations in said fluid speed (v).

A turbine driven electric power production system and a method for control thereof

A turbine (2) driven electric power production system (1), - said turbine (2) arranged for being driven by a fluid (3) having a fluid speed (v) varying in time, - said turbine (2) connected to a hydrostatic displacement pump (6) further connected to a hydrostatic displacement motor (8) as part of a closed loop hydrostatic transmission system (7), - said motor (8) arranged for driving an electrical generator (9) supplying AC power (10) at a frequency (f) near a given desired frequency (f), characterized by a closed loop system arranged for controlling a volumetric displacement (13) of the hydrostatic motor (8), comprising - a fluid speed meter (11m) arranged for producing a speed signal (11s) representing a speed (v) of said fluid (3), and - a rotational speed meter (12m) arranged for providing a rotational speed signal (12s) representing a rotational speed measurement (ω) of said turbine (2), - a motor displacement control system (15) for continuously receiving said speed signal (11s) and said rotational speed signal (12s) and arranged for calculating a control signal (16), - a volumetric displacement control actuator (17) on said hydrostatic motor, arranged for receiving said control signal (16) for continuously adjusting a volumetric displacement (d) of said hydrostatic motor (8) for maintaining a set turbine tip speed ratio (tsr) and thereby providing an improved power efficiency of the power production system (1) during fluctuations in said fluid speed (v).

SYSTEM FOR THE DEVELOPMENT OF ELECTRIC ENERGY WITH A DRIVE FROM A TURBINE AND A METHOD FOR MANAGING THIS SYSTEM

Предложены система выработки электрической энергии с приводом от турбины и способ управления такой системой. Система (1) содержит турбину (2), выполненную с возможностью приведения в действие посредством текучей среды (3), имеющей скорость (v) текучей среды, изменяющуюся во времени. Турбина (2) соединена с гидростатическим объемным насосом (6), также соединенным с гидростатическим объемным двигателем (8) в качестве части системы гидростатической передачи. Система содержит систему (15, 15а) управления с замкнутым контуром, выполненную с возможностью непрерывного приема сигнала (11) скорости (v) текучей среды, а также непрерывного приема сигнала (12m) скорости вращения турбины, вычисления сигнала (16) управления для исполнительного механизма (17) управления рабочим объемом гидростатического двигателя для непрерывной коррекции рабочего объема (d) гидростатического двигателя (8), для поддержания уставки по коэффициенту скорости концов лопаток и достижения повышенного энергетического КПД системы (1) во время флуктуации скорости текучей среды. A system for generating electrical energy driven by a turbine and a method for controlling such a system are proposed. System (1) comprises a turbine (2) configured to be driven by a fluid (3) having a fluid velocity (v) varying with time. The turbine (2) is connected to a hydrostatic displacement pump (6), also connected to a hydrostatic displacement engine (8) as part of a hydrostatic transmission system. The system contains a closed-loop control system (15, 15a), configured to continuously receive the signal (11) of the fluid speed (v), as well as continuously receive the signal (12m) of the turbine speed, calculate the control signal (16) for the actuator (17) control of the working volume of a hydrostatic engine for continuous correction of the working volume (d) of a hydrostatic engine (8), to maintain the setpoint for the speed of the ends of the blades and to achieve increased energy efficiency of the system (1) remja fluid ...

Turbine driven electric power production system and a method for control thereof

A turbine ( 2 ) driven electric power production system ( 1 ), —said turbine ( 2 ) arranged for being driven by a fluid ( 3 ) having a fluid speed (v) varying in time, —said turbine ( 2 ) connected to a hydrostatic displacement pump ( 6 ) further connected to a hydrostatic displacement motor ( 8 ) as part of a closed loop hydrostatic transmission system ( 7 ), —said motor ( 8 ) arranged for driving an electrical generator ( 9 ) supplying AC power ( 10 ) at a frequency (f g ) near a given desired frequency (f des ), characterized by a closed loop system arranged for controlling a volumetric displacement ( 13 ) of the hydrostatic motor ( 8 ), comprising —a fluid speed meter ( 11 m ) arranged for producing a speed signal ( 11 s ) representing a speed (v) of said fluid ( 3 ), and —a rotational speed meter ( 12 m ) arranged for providing a rotational speed signal ( 12 s ) representing a rotational speed measurement (ω) of said turbine ( 2 ), —a motor displacement control system ( 15 ) for continuously receiving said speed signal ( 11 s ) and said rotational speed signal ( 12 s ) and arranged for calculating a control signal ( 16 ), —a volumetric displacement control actuator ( 17 ) on said hydrostatic motor, arranged for receiving said control signal ( 16 ) for continuously adjusting a volumetric displacement (d) of said hydrostatic motor ( 8 ) for maintaining a set turbine tip speed ratio (tsr set ) and thereby providing an improved power efficiency of the power production system ( 1 ) during fluctuations in said fluid speed (v).

A turbine driven electric power production system and a method for control thereof

Prime mover controller for construction machine

一种建筑机械的原动机控制装置，其包括：液压泵(24)，其由原动机(10)驱动；致动器(5)，其由从液压泵(24)流出的压力油驱动；以及控制阀(25)，其用于根据第一操作构件(22a)的操作，控制从液压泵(24)到致动器(5)的压力油的流动。原动机控制装置进一步包括：第一设定装置(41)，其用于根据第一操作构件(22a)的操作，设定原动机(10)的第一设定转速Nt；第二设定装置(43)，其用于根据第二操作构件(34)的操作，设定原动机(10)的第二设定转速Nx；构件(35)，其用于选择第一模式或第二模式；以及装置(30，13)，其用于当选择构件(35)选择第一模式时，控制原动机的转速至第一设定转速Nt，而当选择构件(35)选择第二模式时，其控制原动机的转速至第二设定转速Nx。

Hydraulic transmission vehicle

配置了可用电子控制式的传动装置(86)变更输出/输入转速比的油压变速装置(21)，该传动装置的控制装置(19)存储了提供给该传动装置的设想为该油压式变速装置中未加负载的指令电流值，通过计算实际提供给该传动装置的指令电流值和预先存储的指令电流值之差，计算出该油压式变速装置上增加的负载值，并根据该负载值修正指令电流值，反馈控制该传动装置。或者在车辆中配置了合成该油压式变速装置的输入端和输出端的转矩的差动机构(10)，利用检测器(82)检测其输出轴的主变速输出轴(27)的转速，当该转速不同于与变速操作器的操作相对应确定的该轴(27)的目标转速之差时，修正控制该传动装置，并将该差作为施加于该油压式变速装置上的负载来计算负载。

Automotive control for a hydrostatic drive

Improvements to power plants, for land vehicles, including a heat engine and a hydrostatic transmission

ADJUSTING AND CONTROLLING DEVICE FOR ADJUSTING THE OUTPUT ROTATION MOMENT IN A HYDROSTATIC MECHANISM WITH CASCADE CONTROL OF THE LIMIT POWER

DISPOSITIF DE REGLAGE ET DE COMMANDE POUR LE REGLAGE DU MOMENT DE ROTATION DE SORTIE DANS UN MECANISME HYDROSTATIQUE AVEC REGLAGE SUPERPOSE DE LA PUISSANCE LIMITE, LE MECANISME ETANT CONSTITUE D'UNE POMPE HYDRAULIQUE REGLABLE 1 ET D'UN MOTEUR HYDRAULIQUE 2, ET COMPORTANT DES MOYENS DE SERVOPOSITIONNEMENT 3, 4 POUR LE REGLAGE DE LA POMPE HYDRAULIQUE 1. CE DISPOSITIF COMPREND UN CLAPET DE COMMANDE 13 REGLABLE EN FONCTION DU DEBIT DE TRANSPORT DANS LE CIRCUIT DU MECANISME, CE CLAPET 13 LIMITANT LA PRESSION DE COMMANDE ET N'ETANT DECLENCHE QU'A PARTIR D'UN DEBIT PREDETERMINE. CET AGENCEMENT PERMET DE REGLER LA PUISSANCE DANS TOUTES LES SITUATIONS POSSIBLES DU MECANISME, Y COMPRIS L'INVERSION DE CHARGE SI LES MASSES INTERCALEES DERRIERE LE MOTEUR HYDRAULIQUE SONT DECELEREES. ADJUSTING AND CONTROL DEVICE FOR ADJUSTING THE OUTPUT ROTATION MOMENT IN A HYDROSTATIC MECHANISM WITH SUPERIMPOSED ADJUSTMENT OF THE LIMITED POWER, THE MECHANISM CONSISTING OF AN ADJUSTABLE HYDRAULIC PUMP 1 AND A HYDRAULIC MOTOR 2, AND INCLUDING SERVO-POSITIONING 3, 4 FOR ADJUSTING THE HYDRAULIC PUMP 1. THIS DEVICE INCLUDES A CONTROL VALVE 13 ADJUSTABLE ACCORDING TO THE TRANSPORT FLOW IN THE MECHANISM CIRCUIT, THIS VALVE 13 LIMITING THE CONTROL PRESSURE AND ONLY TRIPPING FROM A PREDETERMINED FLOW. THIS ARRANGEMENT ALLOWS THE ADJUSTMENT OF THE POWER IN ALL THE POSSIBLE SITUATIONS OF THE MECHANISM, INCLUDING THE REVERSE OF LOAD IF THE INTERCALED MASSES BEHIND THE HYDRAULIC MOTOR ARE DECELERED.

CONTROL CIRCUIT FOR ADJUSTING THE FLOW OF A PUMP DRIVEN BY A PRIMARY MOTOR

Ce circuit de commande pour régler le débit d'une première pompe entraînée par un moteur primaire, se caractérise en ce qu'il comprend : des moyens de commande pour régler le débit de ladite pompe; un actionneur de régime lent comportant un piston, une première et une seconde chambre d'actionnement aux extrémités opposées dudit piston et des moyens de sollicitation ; des moyens pour développer de façon réglable des premiers et des seconds signaux de commande en réponse à la vitesse de fonctionnement du moteur primaire, lesdits moyens ayant un premier conduit pour délivrer ledit signal de commande à la première chambre et un second conduit pour délivrer ledit signal de commande à la seconde chambre; et une valve de dérivation reliée au premier et au second conduits pour faire passer le fluide expulsé de la première chambre vers la seconde chambre lorsque le débit du fluide expulsé de la première chambre dépasse une limite prédéterminée. This control circuit for adjusting the flow rate of a first pump driven by a primary motor, is characterized in that it comprises: control means for adjusting the flow rate of said pump; a low speed actuator comprising a piston, a first and a second actuating chamber at opposite ends of said piston and biasing means; means for adjustably developing first and second control signals in response to the operating speed of the primary motor, said means having a first conduit for delivering said control signal to the first chamber and a second conduit for delivering said signal control to the second chamber; and a bypass valve connected to the first and second conduits for passing fluid expelled from the first chamber to the second chamber when the flow rate of fluid expelled from the first chamber exceeds a predetermined limit.

Hydrostatic tractor vehicle transmission - with torque limiter to protect transmission from excessive power take-off point torque

The tractor engine drives a mian hydrostatic pump for the hydrostatic motors as well as several PTO points. In order to protect the transmission from excessive power when the PTO points are open, simple pressure regulators ar fitted between the primary-and secondary lines to the hydrostatic motors to limit the torque. These are spring biassed piston units in the hydraulic lines operating valve levers directly. The units may be linked to limit the total power available between the points.

DEVICE FOR CONTROLLING A MOTOR-TRANSMISSION ASSEMBLY

Patent FR2118355A5

Improvements to hydraulic transmissions

Starting system for internal combustion engines

Patent FR2414666B1

A multi-mode hydromechanical transmission shift system having a hydrostatic unit with at least one variable and reversible displacement component with a displacement control, a plurality of clutches independently operable for setting the mode of operation of the transmission and a control circuit including a plurality of valves for setting the mode of operation and responsive to the position of the displacement control for causing a shift in operation from one clutch to the other to change the mode of operation.

Patent FR2121871A1

ADJUSTING AND CONTROLLING DEVICE FOR ADJUSTING THE OUTPUT ROTATION MOMENT IN A HYDROSTATIC MECHANISM WITH CASCADE CONTROL OF LIMITED POWER

PRIORITY PRESSURE CONTROL

COMMANDE UTILISANT LE DEBIT DE SORTIE D'UNE POMPE 16 POUR REDUIRE LA COURSE D'UNE POMPE VOLUMETRIQUE A DEBIT VARIABLE 10 AFIN DE MINIMISER LA PERTE DE PUISSANCE ET LE DEGAGEMENT DE CHALEUR, LE CIRCUIT DE LA POMPE COMPRENANT PAR AILLEURS UN DISTRIBUTEUR DE COMMANDE DE DEBIT 45. LE CIRCUIT DE COMMANDE COMPREND DEUX SERVOMOTEURS DE COMMANDE DE DEBIT 30, 31 QUI SONT RACCORDES L'UN A L'AUTRE LORSQUE LE DISTRIBUTEUR DE COMMANDE DE DEBIT 45 EST EN POSITION NEUTRE A LAQUELLE IL BLOQUE LA COMMUNICATION DE CES SERVOMOTEURS AVEC LA PRESSION DE COMMANDE DE DEBIT 50 ET LA PURGE 51, LA POMPE 10 NE POUVANT PAS ETRE MISE EN POSITION DE DEBIT MAXIMAL EN REPONSE A CERTAINES DEFAILLANCES DU CIRCUIT PRIORITAIRE DE COMMANDE DE PUISSANCE. APPLICATION PAR EXEMPLE AUX TRACTEURS. CONTROL USING THE OUTPUT FLOW OF A 16 PUMP TO REDUCE THE STROKE OF A 10 VARIABLE FLOW VOLUMETRIC PUMP IN ORDER TO MINIMIZE THE LOSS OF POWER AND THE HEAT DISCHARGE, THE PUMP CIRCUIT INCLUDING A CONTROL VALVE ALSO FLOW 45. THE CONTROL CIRCUIT INCLUDES TWO FLOW CONTROL SERVOMOTORS 30, 31 WHICH ARE CONNECTED TO ONE ANOTHER WHEN THE FLOW CONTROL DISTRIBUTOR 45 IS IN NEUTRAL POSITION IN WHICH IT BLOCKS THE COMMUNICATION OF THESE SERVOMOTORS WITH THE FLOW CONTROL PRESSURE 50 AND PURGE 51, PUMP 10 CANNOT BE PUT TO MAXIMUM FLOW POSITION IN RESPONSE TO CERTAIN FAILURES OF THE PRIORITY CONTROL CIRCUIT. APPLICATION FOR EXAMPLE TO TRACTORS.

DEVICE FOR CONTROLLING A MOTOR-TRANSMISSION ASSEMBLY

L'invention concerne un dispositif de commande d'un ensemble moteur-transmission. Ce dispositif comporte un régulateur d'alimentation en carburant qui fait fonctionner le moteur suivant une courbe coïncidant avec la courbe de consommation minimale. Il comporte également une vanne produisant un signal de demande de puissance, une vanne produisant un signal représentatif du régime du moteur et une vanne de régulation de rapport qui, sous l'effet des signaux de demande de puissance et de régime, règle le rapport de la transmission et détermine le régime du moteur pour établir ainsi la puissance développée par ce dernier. Domaine d'application : commande de moteurs à combustion interne, notamment du type Diesel, etc. The invention relates to a device for controlling an engine-transmission assembly. This device comprises a fuel supply regulator which operates the engine according to a curve coinciding with the minimum consumption curve. It also comprises a valve producing a power demand signal, a valve producing a signal representative of the engine speed and a ratio control valve which, under the effect of the power demand and speed signals, adjusts the gear ratio. transmission and determines the engine speed to establish the power developed by the latter. Field of application: control of internal combustion engines, in particular of the diesel type, etc.

CONTROL DEVICE FOR A HYDROSTATIC TRANSMISSION

Ce dispositif de commande pour transmission ou changement de vitesse hydrostatique entraîné par un moteur à combustion interne comprend deux circuits de mesure dont les principaux éléments sont deux étranglements 55 et 59, dont l'un, 55, est conjugué au moteur (papillon 50), l'autre à la transmission (pompe hydraulique réglable 11). La différence de pression sur l'étranglement 55 augmente proportionnellement à la vitesse de rotation du moteur et il s'établit une vitesse définie lorsque le papillon 50 est fermé de manière que le moteur puisse encore << tirer >> tout juste le couple de charge produit par la transmission.

Hydrostatic transmission system for motor vehicles

CONSTANT SPEED GENERATOR DRIVE SYSTEM AND SHAFT SPEED CONTROL APPARATUS

Hydrostatic transmission esp. for goods vehicles - includes servo mechanisms which are electrically controlled as function of accelerator position

Hydrostatic transmission is esp. directed at industrial vehicles moving loads within a factory complex, where the engine speed is often likely to be low and likely to present control problems due to the limited hydraulic cylinder movement. This is overcome by controlling the servo-mechanism electrically as a function of the accelerator position. The transmission system has an orthodox pump (1) driven by the vehicle motor and has two servo pistons and a plate whose angle is dependent on the pistons between two limiting positions. The pilot line (4) to the pistons is controlled electrically (5) and by a pressure regulator (10) such that the two service lines (6) are fed selectively. The control input is derived from a comparator (6) determining which is the greater of its two input line commands (8, 9).

CONTROL INSTALLATION FOR A DRIVE UNIT COMPOSED OF AN INTERNAL COMBUSTION ENGINE AND A HYDRAULIC TRANSMISSION

Differential drive for vehicles

Hydraulic control system for operating a reversible hydraulic motor

Abstract of the Disclosure Hydraulic Control System for Operating A Reversible Hydraulic Motor Reversible hydraulic motors driven by fluid from variable displacement pumps are useful in driving various mechanisms of earthmoving machines. It is desirable to control both the speed and direction of the motor with a single lever. The subject hydraulic control system includes a selector valve which has a fluid control section for directing pilot fluid to a reversing valve to reverse the direction of the motor. A signal control valve is mechanically actuated by movement of the selector valve to the operating position so that a regulated pressure control signal is directed to a displacement control of variable displacement pump to regulate the volumetric output of the pump and thus the operating speed of the motor.

CIRCUIT FOR ADJUSTING THE FLOW RATE OF THE SUPPLY PUMP OF A HYDRAULIC TRANSMISSION

Ce circuit de commande comprend : des moyens de commandes pour régler le débit de ladite première pompe; un actionneur de régime lent ayant un piston, une première et une seconde chambres d'actionnement aux extrémités opposées dudit piston et des moyens de sollicitation, ledit piston étant relié aux moyens de commande et pouvant se déplacer entre une première position dans laquelle le débit de cette première pompe est minimal et une seconde position dans laquelle le débit de cette première pompe est maximal, lesdits moyens de sollicitation sollicitant le piston vers la première position, ledit piston pouvant se déplacer entre ladite première et ladite seconde position en réponse à une différence de pressions dans lesdites première et seconde chambres ; des moyens de détection pour développer de façon réglable un premier et un second signal de commande en fonction de la vitesse du moteur primaire et pour délivrer lesdits signaux respectivement à la première et à la seconde chambres; et, des premiers moyens pour réduire de façon réglable la grandeur de la pression dans la première pompe dépasse une limite préétablie. This control circuit comprises: control means for adjusting the flow rate of said first pump; a low speed actuator having a piston, first and second actuating chambers at opposite ends of said piston and biasing means, said piston being connected to the control means and movable between a first position in which the flow rate of this first pump is minimal and a second position in which the flow rate of this first pump is maximum, said biasing means urging the piston towards the first position, said piston being able to move between said first and said second position in response to a difference in pressures in said first and second chambers; detection means for adjustably developing a first and a second control signal as a function of the speed of the primary motor and for outputting said signals to the first and second chambers, respectively; and, ...

Patent FR2231537B1

Patent FR2441107B1

SPEED LIMITER FOR MOTOR DRIVING A PUMP

COORDINATED CONTROL DEVICE OF A TRACTOR VEHICLE AND A TOWED VEHICLE

Patent FR2088570A5

Patent FR2377561B1

Hydraulic motor regulator device

AUTOMATIC CONTROL FOR HYDROSTATIC VEHICLE TRANSMISSIONS

L'invention a trait à une commande automatique pour transmissions hydrostatiques de véhicules. Elle a pour objet une commande pour transmissions hydrostatiques dans laquelle, lors du démarrage à froid, la vitesse de rotation n'estpas inférieure à celle du fonctionnement à chaud Application: notamment aux transmissions hydrostatiques de véhicules.

HYDROSTATIC TRANSMISSION CONTROL DEVICE

Dispositif dans lequel l'élément d'étranglement peut être constitué par le branchement en parallèle d'un étranglement fixe et d'un étranglement poussé par un ressort. Le moteur 10 entraîne une pompe auxiliaire 11 et une pompe réglable 12 qui fonctionne en circuit fermé 13, 14 avec un moteur hydraulique 15. Deux soupapes antiretour 34, 35 relient les tubulures 13, 14. L'organe de réglage 16 de la pompe, qui modifie la course des éléments régleurs, est actionné par le servomoteur 17 qui possède un piston 18 poussé par un ressort 19 et relié par la timonerie 20 à l'élément 16. L'élément d'étranglement 23 est formé d'un tiroir 24 poussé par un ressort 29 et glissant dans l'alésage 22. Le tiroir comporte un alésage borgne 25, une encoche d'étranglement 26 et un trou d'étranglement 27 relié par la rainure annulaire 28 aux canaux 30 et 31. Le repère 36 désigne une soupape de limitation de la pression d'alimentation. Device in which the throttle element can be formed by the parallel connection of a fixed throttle and a throttle pushed by a spring. The motor 10 drives an auxiliary pump 11 and an adjustable pump 12 which operates in a closed circuit 13, 14 with a hydraulic motor 15. Two non-return valves 34, 35 connect the pipes 13, 14. The regulating member 16 of the pump, which modifies the stroke of the adjusting elements, is actuated by the servomotor 17 which has a piston 18 pushed by a spring 19 and connected by the linkage 20 to the element 16. The throttling element 23 is formed by a slide 24 pushed by a spring 29 and sliding in the bore 22. The spool has a blind bore 25, a throttle notch 26 and a throttle hole 27 connected by the annular groove 28 to the channels 30 and 31. Reference 36 designates a supply pressure limiting valve.

Hydraulic transmission device

Patent FR2324049B1

Hydraulic transmission device

AUXILIARY TRANSMISSION HYDRAULIC CIRCUIT FOR VEHICLES

Advanced transmission for motor vehicles

CONTROL DEVICE FOR FLUIDIC ENERGY TRANSMISSION CIRCUIT

Patent FR2394697B1

PRESSURE FLUID SUPPLY CIRCUIT COMPRISING A VARIABLE CYLINDER PUMP

Patent FR2122951A5

Patent FR2138527B1

PRESSURIZED FLUID SUPPLY CIRCUIT WITH VARIABLE CYLINDER PUMP

L'INVENTION EST RELATIVE A UN CIRCUIT D'ALIMENTATION DE DEUX RECEPTEURS 10, 11 EN PARALLELE, PAR UNE POMPE A CYLINDREE VARIABLE 1 A REGULATION DE PUISSANCE 16. LES MANIPULATEURS 14, 15 ASSOCIES AUX DISTRIBUTEURS DE COMMANDE 12, 13 DES RECEPTEURS 10, 11 SONT ALIMENTES EN UN FLUIDE DONT LA PRESSION EST VARIABLE EN FONCTION DE LA VITESSE D'ENTRAINEMENT DE LA POMPE 1. UNE APPLICATION EST CONSTITUEE PAR LA REALISATION D'UN CIRCUIT D'ALIMENTATION D'UNE PELLE HYDRAULIQUE. THE INVENTION RELATES TO A CIRCUIT FOR SUPPLYING TWO RECEIVERS 10, 11 IN PARALLEL, BY A VARIABLE CYLINDER PUMP 1 WITH POWER REGULATION 16. THE MANIPULATORS 14, 15 ASSOCIATED WITH THE CONTROL DISTRIBUTORS 12, 13 OF THE RECEIVERS 10, 11 ARE SUPPLIED WITH A FLUID THE PRESSURE OF WHICH IS VARIABLE DEPENDING ON THE DRIVE SPEED OF THE PUMP 1. AN APPLICATION IS CONSTITUTED BY THE REALIZATION OF A SUPPLY CIRCUIT FOR A HYDRAULIC EXCAVATOR.

Hydraulic and automatic trenching machine

Patent FR2323038B1