Marine propulsion device

Technical Field

On this invention will not be in when the ship sails due to external disturbances such as waves of variation of the load of the internal combustion engine of the marine propulsion device.

Background Art

The thrust of the propellers of a ship sailing on the water source of power, usually use of an internal combustion engine such as a diesel engine, in Patent literature 1, 2 in the internal combustion engine on the basis of the additional electric motor as a power source of hybrid propulsion device. The hybrid propulsion device, driven by an internal combustion engine for generating electricity with the generator, in the navigation of the ship, while driving the propeller by the internal combustion engine, a-side drive-generator to charge the battery, when the driving electric motor, from the battery power supply to the electric motor. In order to seek to promote miniaturization of the device, is utilized with an electric motor and generator functions of the function of the power generating motor.

In the above-mentioned composite propulsion device, when in the normal sailing ship propeller driven by an internal combustion engine, and even at a low speed and with little speed when navigating the frequency in use of the backward navigation, the propeller is driven by the electric motor. With little speed of navigation through the backward navigation or when the propeller is driven by the electric motor, the internal combustion engine to eliminate the generation of noise, and the stop when the ship is bolted to the electrical equipment of the power supply of the battery.

On the other hand, in Patent literature 3 in, the recorded applied to the propeller is greater than the load torque of the output torque of the internal combustion engine under the condition of, the power generating motor in order to assist the mode to work, the auxiliary supply motor torque to the propeller, in the applied to the propeller is less than the load torque of the output torque of the internal combustion engine under the condition of, the power generating motor to the work of the power generating mode ship propulsion device. As such, according to the load torque and the output torque of the large and small relationship between working mode switching of the motor for power generation mode and in the auxiliary mode of a certain mode, to maintain a certain load of the internal combustion engine.

Literature of the prior art

Patent literature

Patent literature 1 : opens especially 2001-270495, the

Patent literature 2 : opens especially 2001-301692, the

Patent literature 3 : opens especially 2010-241160, the

Content of the invention

Subject to be solved by the invention

However, according to the load torque and the output torque of the large and small relationship between the work of the power generating motor switching over the mode to a load of the internal-combustion engine, the need for accurate measurement of the load torque. In the measurement of the load torque, such as the propeller shaft using the measure of distortion of the strain gauge, however, phototransistor stop of the internal combustion engine under the state of the zero point calibration of the, propeller shaft could not be confirmed due to the residual stress, therefore, the load torque includes an error measurement result, can not accurately measuring a load torque.

According to the load torque and the output torque switching the size relation of the working mode of the power generation of the motor, in the load torque and the output torque exceeds, because the power generation and the power generation output of the motor also includes a change in the output of the motor, therefore, according to the load torque and the output torque is large and small relationship between the output torque of the internal combustion engine can be controlled to maintain a certain, unable to effectively improve fuel efficiency.

Furthermore, in the load torque and the output torque of the large and small relationship does not change for a long time under the condition of, in the power generating mode and the auxiliary mode to a mode of sustained for a long time. However, should battery of the ship from the loading for a long time or electric power is supplied to the power generation of the motor for a long time from the generator motor to charge the battery, the battery capacity or switching control time, and the like have certain limits.

The purpose of this invention is that, by the output torque of the internal combustion engine of the ship to maintain a certain, so as to improve fuel efficiency of the internal combustion engine.

Method of solving the subject

Ship propulsion device of the present invention, the marine propulsion device is provided with a connection to the ship propeller and of the applied thrust of the main shaft of the internal combustion engine of the power transmission path is ship propulsion device, characterized in that the marine propulsion device includes: electric generator, the electric generator is arranged in the power transmission path, and is driven by the internal combustion engine for generating electric power; electric power is given , the power is given by the heating appliance is supplied to generate power; the load torque computing unit, the load torque applied to an operation part in the power transmission path of the load torque of the operation; the control member, the control member by the load torque computing unit operation of the load torque and the torque exerted on the power transmission path changes in the load torque of the comparing of the reference value, the changes in the load torque is greater than the reference value under the situation of the generating capacity of the heating appliance is reduced, the load torque is smaller than the reference value under the condition of the changes in the power generation capacity of said generator.

Ship propulsion device of the present invention, the marine propulsion device is provided with a connection to the ship propeller and of the applied thrust of the main shaft of the internal combustion engine of the power transmission path is ship propulsion device, characterized in that the marine propulsion device comprises: an electric motor, the electric motor is arranged in the power transmission path, auxiliary to provide power to the propeller; power source, the electric power supply to stated electric motor; load torque computing unit, the load torque applied to an operation part in the power transmission path of the load torque of the operation; the control member, the control member by the load torque computing unit operation of the load torque and the torque exerted on the power transmission path changes in the load torque of the comparing of the reference value, the changes in the load torque is greater than the reference value under the condition of the auxiliary output of the electric motor increases, the load torque is smaller than the reference value of the change in the reduced under the condition that the auxiliary output of the electric motor.

Ship propulsion device of the present invention, the marine propulsion device is provided with a connection to the ship propeller and of the applied thrust of the main shaft of the internal combustion engine of the power transmission path is ship propulsion device, characterized in that the marine propulsion device includes: electricity generating motor, the power generating motor is arranged in the power transmission path, and is driven by the internal combustion engine at the same time of generating electrical power to provide power to the auxiliary states the propeller ; power is given , is given is supplied to the electric power by the electric power generated by the power generation of the motor; power source, the electric power to stated electricity generating motor supply electric power; electric power load torque computing unit, the electric power load torque applied to an operation part in the power transmission path of the load torque of the operation; the control member, the control member by the load torque computing unit operation of the load torque and the torque exerted on the power transmission path changes in the load torque of the comparing of the reference value, the changes in the load torque is greater than the reference value under the condition of the operation from the source of electric power of the power generating motor and auxiliary to provide power to the propeller, the changes in the load torque is less than the reference value by the internal combustion engine under the condition of generating the revolution states power is given to the motor and the power supply.

Ship propulsion device of the present invention, characterized in that load torque on the basis of the operation of the power transmission path should be variable ([...]) carry out the operation or on the basis of the rotation number of the power transmission path for operation.

The effect of this invention

According to the present invention, because it can prevent the transmission of variation of the load of the internal combustion engine, even if the external interference apply to ship, the output of the internal combustion engine can also be always keep a certain torque, the fuel efficiency of the internal combustion engine.

When navigating through the will be applied to changes in the load torque of the propellers is compared with the reference value, a change in the torque based on the load and control the amount of power generation or control the auxiliary output, the power generation can be controlled with high accuracy or the auxiliary output, to reduce the impact of the load torque of the internal combustion engine, the fuel efficiency of the internal combustion engine.

The load torque and the changes in the reference value, the operation mode of the power generating motor is switched to the auxiliary control mode and the power generation control mode, thereby reducing the applied to the impact of the load torque of the internal combustion engine, the fuel efficiency of the internal combustion engine.

Description of drawings

Figure 1 is block diagram of the one embodiment of the invention the marine propulsion device.

Figure 2 is idiogram of said ship navigation in generating the state of the surface of the wave.

Figure 3 of the in (A) that generate waves and make the surface of the standard relative to the state of the variation in water level the idiogram, Figure 3 of the in (B) is said that because of wave and make the speed changing idiogram, Figure 3 of the in (C) is said that because of wave and the load torque change applied to the propeller the idiogram, Figure 3 of the in (D) is expressed in the wave changes in the load torque under the condition of the number of rotations of the internal combustion engine to be compared with the prior art mode map.

Figure 4 is the time sequence chart of ship propulsion device in that the power generation control mode.

Figure 5 is a timing diagram of the ship propulsion device in said auxiliary control mode.

Figure 6 is the sequential chart of said in ship propulsion device for the automatic switching of the control mode.

Figure 7 is the characteristic curve of the fuel supply to the engine under the state of keeping a certain engine output torque and the relationship between the number of rotations of the main shaft.

Figure 8 is block diagram of said other of the invention one embodiment of a propulsion device.

Figure 9 is diagram of said and of this invention one embodiment of a propulsion device.

Note the Figure mark

11: propeller

12: power transmission path

12a: screw propeller shaft

12b: main shaft

13: internal combustion engine

14: electricity generating motor

15: inboard electrical equipment

16: generator

17: power line

18: power conversion device

19a: capacitor

19b: charging and discharging tray

20: controller (control section, arithmetic section)

21a, 21b: strain gauge

22a, 22b: load torque detector

25: gear box

26: waste heat recovery device

27a, 27b: rotation number detector

Mode of execution

The following, based on the Figure the embodiment of the present invention to carry out a detailed description. As shown in Figure 1, applying the thrust of the propeller of the ship 11 is arranged on the propeller shaft 12a is connected to the engine, that is, is connected to the internal combustion engine 13 of the spindle 12b. Propeller shaft 12a and the main shaft 12b, which constitute a power transfer path 12, the effective output of the engine (output pure taste), that is, the output torque through the power transmission path 12 is transmitted to the propeller 11. In the power transmission path 12 is provided with a power generating motor 14, electricity generating motor 14 as the propeller 11 applied power as a function of the electric motor and by the internal combustion engine 13 and the function of the electric generator of electricity.

The ship in order to meet the various inboard is arranged in the electrical apparatus of the 15 power needs, in the ship is provided with a generator 16, the generator 16 power generation of the power through the power line 17 transmitted to the inboard electrical equipment 15. Inboard electrical apparatus 15 as the function of the power supply and power is given , generator 16 to supply power to the electric power is given as the power source.

Electricity generating motor 14 through the frequency and voltage conversion function of the electric power conversion device 18 is connected with the inboard electrical equipment 15 and generator 16, the power generating motor 14 operates as a generator and power generated by the inboard electrical apparatus according to the 15 the need for supply of electric power. On the other hand, the power generating motor 14 as the electric motor to operate and the propeller 11 under the condition of the auxiliary power, can be from the generator 16 to the power generating motor 14 the power supply. And then, in the ship with capacitor 19a, capacitor 19a charging and discharge disc 19b is connected to the power line 17. Capacitor 19a to the charging electric power is supplied to the power generating motor 14, and make the power generating motor 14 operates as an electric motor, can be carried out at the same time the electric power is generated by the generator motor 14 generating the electric power. As such, set up the capacitor through the propulsion device 19a, thus capacitor 19a is given and a source of electric power.

Electricity generating motor 14, capacitor 19a by the as the control part of the controller 20 to control. Figure 1 the propulsion device is shown, the controller 20 to control, can be from the generator 16 and capacitor 19a in any one of the power generating motor 14 to power supply, at the same time the electric power is generated by the generator motor 14 power generation electric power is supplied to the inboard electrical equipment 15 and capacitor 19a in any one of. The internal combustion engine 13 of the rotation number of the, fuel supply to the detection of the driving condition of internal combustion engine such as a signal is sent to the control device 20, at the same time, the controller 20 controls the internal combustion engine 13 drive.

As such, Figure 1 the propulsion device is shown, can be from the generator 16 and capacitor 19a in any one of the power generating motor 14 the power supply, at the same time the electric power is generated by the generator motor 14 power generation electric power is supplied to the inboard electrical equipment 15 and capacitor 19a in any one of. Other than this manner, there are also only from the generator 16 to the power generating motor 14 in a manner to supply power, and only from the capacitor 19a to the power generating motor 14 in a manner to supply power. Similarly, also the electric power is generated by the generator motor 14 inboard to supply the electric power generated by electric equipment 15 ways and only supply capacitor 19a manner.

In the propeller shaft 12a is provided with a strain gauge 21a, from the strain gauge 21a using a wireless signal to the load torque detector 22a sends the detection signal. The strain gauge 21a with the applied to the propeller shaft 12a corresponding to the torsional stress of the detection signal, for example, to 500Hz frequency is sent to the load torque detector 22a. In the main shaft 12b is provided with a strain gauge 21b, from the strain gauge 21b using a wireless signal to the load torque detector 22b sends the detection signal. The strain gauge 21b of the main shaft will be applied and 12b corresponding to the torsional stress of the detection signal, with the strain gauge 21a the same frequency is sent to the load torque detector 22b.

Each load torque detector 22a, 22b through the detection signal of the signal line transmitted to the controller 20, based on the detected signal can be the propeller shaft 12a and the main shaft 12b to the load torque of the operation. As shown in Figure 1, although the power transmission path 12 is provided with two strain gauge 21a, 21b, but can be made of the operation of any one strain gauge is applied to the propeller during the navigation of the ship 11 of the load torque. Furthermore, may also be based on two strain gauge 21a, 21b of the detection signal of the two load torque the intermediate value as the value of the load torque.

The propeller 11 to almost a certain number of rotations of the rotary state, when the water surface of the external disturbances such as waves or fluctuations applied to the propeller 11 by the power transmission path 12 when the load torque changes, propeller shaft 12a, the spindle 12b of the changes in the torsional stress, therefore, can be according to from the strain instrument 21a, 21b of the signal operation is applied to the propeller 11 of the load torque. However, in order to detect the load torque, can also use the optical shaft torque meter alternative strain gauge 21a, 21b.

Controller 20 with the operation control signal of the microprocessor (CPU) and memory control program, arithmetic type, mapping ([...]) data ROM and RAM temporary storage of data, having a function of the operation part. Controller 20 based on from each strain gauge 21a, 21b of the detection signal, the data stored in the ROM of the operational load or operational torque.

With the main shaft 12b corresponding to the actual rotation number of the rotation number of the actual signal and and supplied to the internal combustion engine 13 of the fuel supply amount corresponding to the amount of supply of the signal transmitted to a controller 20, based on the transmitted to a controller 20 of the signal, the controller 20 operation internal combustion engine 13 Ta the effective output torque. Therefore, controller 20 internal combustion engine having operation 13 Ta of the function of the output torque, but also can adopt the internal combustion engine 13 there is no illustrated for controlling the output torque from the engine controller of the signal transmitted to a controller 20 manner. Ta is effective for the output torque of the friction loss in the air cylinder from the internal combustion engine of the 13 spindle 12b output torque, can also be referred to as the brake torque. The internal combustion engine 13 Ta of the output torque of the operation modes, can also be determined by a shaft torque meter spindle 12b of the output torque.

Figure 2 is idiogram of said ship navigation in generating the state of the surface of the wave. As shown in Figure 2, when the ship along the directions indicated by the arrow when navigating on the water surface, ship state of the wave from the driven to the S1 navigation after the state of the vertex of the wave S2 and down state of the wave S3 reaches the lowest point of the wave state S4. In the event of a ship navigation under periodic wave when the state of the, such navigational state will be periodically repeated.

Figure 3 of the in (A) that generate waves and make the surface of the standard relative to the state of the variation in water level the idiogram, Figure 3 of the in (B) is said that because of wave and make the speed changing idiogram, Figure 3 of the in (C) is said that as the waves applied to the propeller 11 Qa changes in the load torque of the idiogram, Figure 3 of the in (D) is expressed in the wave and the Qa changes in load torque under the condition of the number of rotations of the internal combustion engine to be compared with the prior art mode map.

In the ship in the approaching wave and driven to the state of the wave S1 time, applied to the navigation of the hull caused by wave and increase impedance, reducing the speed. Because of the reduced speed, to the propeller 11 flows into the speed of the flowing water is also reduced, therefore, applied to the propeller 11 increase the load torque of the Qa. The sail load torque Qa the lowest speed of the state of the vertex of the wave S2 reaches the maximum in the vicinity. On the other hand, after the peak of the wave, the wave impedance of the resulting suddenly reduced, in addition to the role of the acceleration of gravity, will be rapidly increase speed, Qa will reduce the load torque. Therefore, if the generate waves on the water surface during the navigation of the ship, the speed and the load torque Qa as shown in Figure 3 of the in (B), diagram 3 of in (C) changes as shown. However, load torque and speed of the change of the Qa in Figure 3 of the in (B), diagram 3 of in (C) resists in the synoptic nature of the display, the change of the relative actual wave of load torque and speed of the phase of the Qa will be more complex than the picture shows the situation with the phase difference.

As shown in Figure 3 of the in (C) is shown, as applied to external disturbances such as waves of the ship, is applied to the propeller 11 will be Qa of changes in load torque. Applied to the propeller 11 by states the load torque of the cycle is on the basis of Qa from the strain instrument 21a, 21b of the detection signal from the controller 20 to process the operation. Controller 20 will be the load torque of the unit time of the average value as a reference value of Qa Qs to changes in operation and stored in the ROM. The changes in the value Qs in the past several seconds to a few minutes between the average value of the load torque of the Qa to calculation, and updated at all times.

Qs as the reference value using the changes in the control mode of the propulsion of the ship, a power generation control mode and the auxiliary control mode.

Figure 4 is the time sequence chart of ship propulsion device in that the power generation control mode. In this power generation control mode, the internal combustion engine 13 is set to Ta the output torque used for driving the propeller 11 of the torque and is used for electric power is generated by the generator motor 14 the sum power generation torque. And the wave and the like applied to the of the ship and the external disturbance is applied to the propeller 11 the change of the load torque of the Qa corresponding to, the power generating motor 14 changes G of the electric energy production, thus the internal combustion engine 13 is set to the output torque of a Ta. As such, through the electric power is generated by the generator motor 14 offset Qa power generation amount of the change of load torque, can make the internal combustion engine 13 output torque Ta to always keep a certain.

In order to use electricity generating motor 14 power generation amount of the offset Qa G the change of the load torque, from load torque detector will be based on 22a the operation detection signal of the load torque of the Qa Qs the change of the load torque is compared to the reference value. As a result, changes in the load torque Qa Qs is larger than the reference value, the reference value compared with the changes in power generation amount of the Qs, reduce electricity generating motor 14 g. power generation amount of the Opposite to this, changes in the load torque is smaller than the Qs Qa under the condition of the reference value, the reference value compared with the changes in power generation amount of the Qs, increase the generating motor 14 g. power generation amount of the

In other words, when the load torque of the operation obtained with the Qa Qs changes in the difference of the reference value, that is, when expressed as the change amount ΔQ = (Qa-Qs), if the variation amount for Δ Q "+", with the increased load torque will be correspondingly decreases the amount of power generation. Opposite to this, if the variation amount for Δ Q "-", and to reduce the load torque of the correspondingly increase the generation capacity.

As described above, changes in the reference value Qs, by the last few seconds to a few minutes between the average value of the load torque of to Qa, and the updating this navigation of the ship, therefore, Qa can be the most suitable for the load torque with changes in weather conditions at sea is compared to the reference value of Qs. As such, by using a power generation motor 14 power generation amount of the load torque absorbed by the change of the Qa, therefore, always certain to Ta drive the output torque of the internal combustion engine 13.

Figure 5 is a timing diagram of the ship propulsion device in said auxiliary control mode. In the auxiliary control mode, to the propeller 11 transfer internal combustion engine 13 and Ta as the output torque of the electric motor functioning electricity generating motor 14 m. auxiliary output The internal combustion engine 13 output torque is set smaller than Ta used for driving the propeller 11 of the torque needed to a certain value. When the ship's wave and the like applied to the external disturbance is applied to the propeller 11 changes in the load torque of the Qa, through the corresponding to the change of the power generating motor 14 changes in auxiliary output M, so that the internal combustion engine 13 is set to the output torque of a Ta. As such, through the electric power is generated by the generator motor 14 the auxiliary output of Qa M offset the change of the load torque, thus can make the internal combustion engine 13 output torque Ta to always keep a certain.

In order to use electricity generating motor 14 the auxiliary output of Qa M offset the change of the load torque, from load torque detector will be based on 22a receive detection signal of the load torque of the Qa Qs the change of the load torque is compared to the reference value. As a result, changes in the load torque Qa Qs is larger than the reference value, the reference value compared with the change in the auxiliary output M Qs, increase the generating motor 14 m. auxiliary output Opposite to this, changes in the load torque is smaller than the Qs Qa under the condition of the reference value, the reference value changes in the Qs compared with the auxiliary output, reduce electricity generating motor 14 m. auxiliary output

In other words, when the load torque of the operation obtained with the Qa Qs changes in the difference of the reference value, that is, when expressed as the change amount ΔQ = (Qa-Qs), if the variation amount for Δ Q "+", the corresponding increase in the load torque of the auxiliary output is increased. Opposite to this, if the variation amount for Δ Q "-", the reduction corresponding to the load torque of the auxiliary output is reduced. As such, by using a power generation motor 14 the auxiliary output of the load torque absorbed by the change of the Qa, therefore, always certain to Ta drive the output torque of the internal combustion engine 13.

In as shown in Figure 1 with electricity generating motor 14 in the propulsion unit, the reference value to the relative changes in the load torque of the Qs Qa corresponding to the amount of change of the control mode, there are also automatic change control mode, the automatic change of the state corresponding to the navigation control mode can be automatically switched to a power generation control mode and the auxiliary control mode in any one mode. In this case, for example, can correspond to the set speed for obtaining the necessary propulsion and host computer output, in other words, the relationship between the internal combustion engine output, or inboard, and supply the power demands of the relationship between, or capacitor 19a is the charging capacity of the relationship between the remaining capacity, automatically switching to Figure 4 the power generation control mode and in Figure 5 the auxiliary control mode shown in any one of mode. And then, the control mode to the other, also through a crew for power generation control mode switching operation and an auxiliary control mode in the manner of a pattern. In this case, the controller 20 is connected with a input control mode of the manual operation switch, the operation of the manual operating switch signal transmitted to a controller 20.

As mentioned above, determines the load torque of the Qa when navigating, the load torque of the determined before the change in Qa Qs Qa and the reference value is compared to the load torque, it is possible to find the amount of load torque Qa. The value of the variation is relative, does not include the error, therefore, when the Δ Q based on change amount of the propulsion device to control, can be based on load torque Qa control with high accuracy.

Figure 6 is a timing diagram of the ship propulsion device as other control mode automatic switching control mode.

In the automatic switching control mode, and changes in the load torque Qs Qa is compared to the reference value, the reference value is larger than Qa changes in load torque under the condition of Qs, the capacitor from as source 19a of the electric power to operate and generate electricity for the motor 14, and to the propeller 11 auxiliary provide power, changes in the load torque is smaller than the Qs Qa under the condition of the reference value, by the internal combustion engine 13 to operate and generate electricity for the motor 14, and to the capacitor as a power is given 19a the power supply. In Figure 6 in, the motor torque for assisting additional crosscourt expressed, by the internal combustion engine 13 to the power generating motor 14 for said annex point the generation torque.

In the automatic switching control mode, the internal combustion engine 13 based on changes in the output torque of the reference value Ta Qs close to the same set as the value of the. Qs as described above changes the reference value in the past several seconds to several minutes Qa between the average value of the load torque of the operation, the output torque is set to be approximately Ta close to the value of the same. As the wave or tide applied to the of the ship, such as the changes in the external disturbances and the reference value Ta Qs and output torque when the difference is greater than the limit value, the output torque changes in the adjustment Ta Qs is close to the value of the reference value. The limit value calculated by the reference value is longer than the period of cycle of the change in the calculated Qs, thereby preventing the frequent change of the output torque of the Ta. As such, when the in order to make the output torque Qs close to the reference value Ta changes in the mode of control, capable of preventing the charging and discharging of the capacitor caused by the deviation of the condition of insufficient capacity.

Therefore, when the ship in a short period in the variation of external disturbances such as waves or fluctuations when navigating on the surface of the water, if applied to the propeller 11 changes in the load torque of the Qa Qs increased compared with the reference value, the power generating motor 14 to propeller shaft 12a auxiliary provide the driving torque, therefore, the internal combustion engine does not need to increase the 13 supply of the fuel, in other words, there is no need to increase the internal combustion engine 13 output torque Ta, it can make the ship navigation. On the other hand, if applied to the propeller 11 changes in the load torque of Qs Qa is reduced compared with the reference value, electricity generating motor 14 will be the internal combustion engine 13 driving, the internal combustion engine 13 will serve as the output torque of the power generation energy use, therefore, can be no need to reduce the internal combustion engine 13 and fuel supplied to internal combustion engine 13 of the target output torque, the ship navigation.

When according to the above-mentioned various kinds of control mode when the propulsion device to control, even if the occurrence of a wave or undulation on the surface of the water, to the internal combustion engine 13 provides a certain amount of state of fuel, as shown in Figure 3 of the in (D) illustrated, no need to change the internal combustion engine 13 the number of rotations of, the output of the internal combustion engine can be kept in a certain torque, the ship navigation. In other words, the output torque can be carried out a certain navigation. As such, even if the load torque of the periodically applied, also can make the internal combustion engine 13 of a certain output torque, therefore, is compared in order to periodically change the internal combustion engine 13 of the rotation number of the driving situation of the way, the fuel efficiency can be improved.

Figure 7 is the characteristic curve of the internal combustion engine at 13 of the fuel supply to the internal combustion engine under the state of keeping a certain 13 output torque and the spindle 12b of the rotation number of the relations between. The internal combustion engine as said characteristic diagram 13 use of the characteristics of the diesel engine, the internal combustion engine 13 the fuel is supplied under a certain state, the output torque and the rotation number has as shown in Figure 5 the relationship between the characteristic. In Figure 7 the, symbol to symbol e that a delivery volume of fuel, respectively, with the symbols from the symbol a to e, the state of the fuel supply amount is reduced. The diesel engine has the number of increase increases its output torque, when revolution ratio of the maximum output torque of the maximum horsepower is also P when the rotation number, the output torque (lower-right [...]) lower right inclined the output characteristic. When normal navigation of the ship, the spindle 12b of the lower rotation number of the drive region.

For example, a ship to Figure 7 is shown in the navigation A the state point, in the past, as a result of the waves or fluctuations applied to the propeller 11 when the load increase, the spindle 12b of the rotation number of the reduced, therefore, to the internal combustion engine 13 will increase the fuel supply, and the load torque relative to the increase of the output torque is also improved. On the other hand, when the load torque is reduced, the rotation number increase, reducing the fuel supply, with the load torque to reduce the relative output torque is also reduced.

Therefore, when the Image of the prior art for short-term interference, as the outside of the control of the supply of fuel, as shown in Figure 3 of the in (D) shown in, frequent change of the rotation number of the engine, the fuel efficiency is reduced. And, when controlling the fuel supply, until the control end, as shown in Figure 3 of the in (D) illustrated, there is a time lag T ([...]), therefore not able to be short-term external interference and stably control the spindle 12b of the rotation number of the. Opposite to this, in the present invention, the short-term external interference, through operating electricity generating motor 14, thus even in the state of external interference, can also be as shown in Figure 3 of the in (D) the shows the spindle 12b maintain certain of the rotation number of the.

As shown in Figure 1, although the power transmission path 12 is provided with an electric motor and generator functions of the function of the power generating motor 14, but can also be in the power transmission path is provided with an electric motor and a generator, respectively. However, as shown in Figure 1, when the power transmission path 12 configuration electricity generating motor 14 at the time, can make the propulsion device is miniaturized. When the power transmission path 12 only when the electric motor is, in the case of load torque increase, to the propeller shaft 12a auxiliary to provide motor power. In this case, in order to Figure 5 the auxiliary control mode shown in the control of the auxiliary output of the electric motor m. On the other hand, when the power transmission path 12 is set only when the power generator, the load torque is reduced under the condition of, the-generator to generate electricity. In this case, in order to Figure 4 the power generation control mode control in the power generation capacity of the generator g.

Figure 8 is block diagram of said other of the invention one embodiment of a propulsion device. The propulsion device relative to the Figure 1 shown in a power transmission path of the advancing device 12 in a single-shaft type, as in the power transmission path 12 is provided with a gear 25 of the gear box-type. The internal combustion engine 13 of the spindle 12b, through the gear box 25 connected to the propeller shaft 12a, electricity generating motor 14 of the spindle 14a through a gear box 25 connected to the propeller shaft 12a. In this case, the gear box 25 combined reversing mechanism in, thus can make the internal combustion engine 13 of the spindle 12b and electricity generating motor 14 of the spindle 14a reverse rotation of, and is transmitted to the propeller shaft 12a. In the gear case 25 in combination with a planetary gear transmission mechanism, as the input side with the one of the input power on the output side of the other as the two shafts of one side of the function of the output, or will serve as two inputs of the input power into the one on the output side of the function of the output shaft.

Figure 9 is diagram of said other of the invention one embodiment of a propulsion device. The propulsion device eliminates the chart 1 the propulsion device shown in the generator 16 is also arranged outside the waste heat recovery device 26 as a power supply source. Waste heat supply device 26 from the internal combustion engine with 13 of the exhaust gas energy of the function of generating electrical power, the waste heat recovery device 26 the low-pressure low-temperature state of the exhaust gas is discharged to the outside.

As the waste heat recovery device 26, is provided with the velocity of flow of the exhaust gas, the pressure can be the type of turbine to rotate and generate electricity and the heat energy of exhaust gas from the boiler and through the boiler of the steam driving a steam turbine for power generation type. As such, the internal combustion engine 13 as the energy of the exhaust of the power supply source, so as to further improve the fuel efficiency of the internal-combustion engine.

Figure 9 the propulsion device is shown, is used for detecting propeller shaft 12a of the rotation number of the detector of the rotation number of the Na 27a and is used for measuring the spindle 12b of the rotation number of the detector of the rotation number of the Nb 27b. As shown in Figure 7, the internal combustion engine 13 with the output torque of the power transmission path is Ta 12 a corresponding relationship between the number of rotations of, by detecting the power transmission path 12 the amount of change of the rotation number of the, can find applied to the propeller 11 the amount of change of the load torque. As such, power transmission path determined 12 of the amount of change of the rotation number of the, find power transmission path means 12 the amount of change of the load torque. Therefore, based on the rotation number of the advance control, if the propeller shaft 12a decrease of the rotation number of the, capacity will be set for or reduce, or increase electricity generating motor 14 of the auxiliary torque, or switch to the motor mode. On the other hand, if the rotation number increase, is set or to increase the power generation amount, or reducing the generating motor 14 of the auxiliary torque, or switches to the power generation mode. However, also corresponding to the load torque can be the fuel-supply quantity and the propeller 11 of the mapping data of the rotation number of the stored in the ROM, by the transfer to the controller 20 from the rotation number detector 27a, 27b of the detection signal, based on the load torque Qa, Qb corresponding propeller shaft 12a and the main shaft 12b with the change of the rotation number of the, in order to make the rotation number become Qs changes in the way of the reference value, for generating control mode and the control of the auxiliary control mode.

Even though in Figure 1 and Figure 8 in the propulsion device is shown, also can use the rotation number detector 27a, 27b alternative load torque detector 22a, 22b. Figure 9 and shown in Figure 1 the same uniaxial type of propulsion device, but also can be and the Figure 8 with the same as the type of gear box.

The invention is not limited to the above embodiment, without deviating from the scope of the purport thereof various changes can be carried out.