A comprises a fixed on the diaphragm of the piezoelectric transducer detecting terminal
Technical Field The invention relates to a for detecting the parking of the motor vehicle with the detecting terminal, the purpose is to monitor compliance with the parking regulations, and/or as motor vehicle guidance device of the basic element. Background Art In recent years, appears on the market in the road is embedded to automatic motor vehicle detecting terminal, these terminals through the radio will take up the transmission of information to the management apparatus. The terminals are the initial use of the earth magnetic field produced by motor vehicles and detecting as a change of the standard. However, the technical reliability is limited, when the parking location when the oblique or monitoring of the presence of the parking near the large motor vehicle such as a bus or truck when, the technical reliability is about 95%, and in the terminal in the tram, a subway or power supply line in the vicinity of, the technology has become highly random. To overcome these disadvantages, builder-imaging in general to optical or acoustic measurement on the basis of the standard to replace or improve the magnetic 2nd. Literature WO06005208 proposes to use in infrared laser or ultrasonic range finder on the basis of supplementary technical 2nd of detecting motor vehicle detector. Therefore, with such a detection, when the detector is not affected by water or snow when the interference, the reliability of the detector more than 99%. Reasonable is, magnetic technology and optical or acoustic technology to ensure that the drying time can be 99% or more of the reliability, interference exists in the presence of factors such as snow, reliability is about 95%. Magnetic technology can be buried in the detector in the road, the use of optical or acoustic technology means that as the detector buried underground portion with air to the interface between a detector sensitive to the detection of the part to be able to send the motor vehicle light or sound radiation, and receives the reflected radiation. The sensitive parts of the optical detector can be a one or a plurality of small glass, or acoustic detector is one or a plurality of surface or of the vibrating diaphragm. Literature DE 199 37 195 provides a comprises a piezoelectric transducer of the detecting part, the piezoelectric transducer through the transducer is fixed on the upper surface of the membrane to send and receive ultrasonic, the diaphragm and the housing opposite to the opening of, and through the connecting element is connected with the shell. The literature known detection part for mounting of the motor vehicle on a shock absorber. Literature WO2011/051040 discloses a the same type of detection components, it also includes the wrapping material made of shock-absorbing structure (structure d'atténuation), piezoelectric transducer buried in the shock absorbing structure. In the shock-absorbing structure and the bottom of the housing is arranged between the gap corresponding to the opening. Both cases, detection part is not suitable for the detection terminal, of the motor vehicle through the wheels, and to snow clearer of the particular road board every day on alternate sides of the parking to the area of the snow, detection part bearing great stress. Literature WO2012/032584 discloses a comprises a piezoelectric transducer of the detecting part, the piezoelectric transducer is fixed in relation to the opening of the slot is arranged in the housing arranged on a membrane. The diaphragm is connected by a connecting part of the shell, the connecting member includes a flexible claw and a closed end of the cylindrical structure, with the structure of a diaphragm relative and permanently against the flexible jaw. The piezoelectric transducer occupy the structure of the closed end of the gap between the and the diaphragm. Structure, the piezoelectric transducer and the diaphragm through the flexible claw is pressed against a surface of the housing, the surface and is arranged in the housing opposite to the opening of the slot. Content of the invention This invention lies in the introduction of contraction part, in order to allow the wheels of the motor vehicle or snow clearer through the board. Therefore, the object of the invention is the detection terminal as described above, characterized in that the diaphragm is connected with a structure, when the diaphragm when under stress, the stated structure allows the diaphragm in an opening of the outer shell by the structure opposite to an opening against the surface of the location determination of the contraction. The structure of the stop position of the connecting member can be a deformation restriction in the deformation of the diaphragm contraction required. In the retracted position, the pressure exerted on the diaphragm by the housing shoulder. Therefore the vehicle through the vehicle in the detection terminal through protection of the piezoelectric transducer, but does not need to formed in the housing is increased. According to the 1st embodiment, structure is tubular in shape, and the connecting member includes an elastic material of the sealing gasket. According to the 2nd embodiment, structure is tubular in shape, and the connection part includes a diaphragm form a single component with the skirt section. According to the 3rd embodiment, the connecting part comprises the diaphragm form a single component of the skirt, the skirt structure includes the thickness of the material in the 1st and 2nd by changes thin material thinned portion of the rib. Sensitive surface, namely the piezoelectric transducer is fixed on the surface of the diaphragm, a favorable position for the pile or road or parking flush, and in-depth, namely there tire or broom of the retracted position when the pressure, in order to protect the surface. Advantageously, the structure and the casing is provided with a preventing them from each other relative to the rotation of the anti-part. Therefore, the detecting terminal also resistance located above the force of the wheel, the wheel may be the driver with respect to the destruction of the detector using the auxiliary system of the motor vehicle the malicious strong action of the target. Measuring method used is included in the measurement to observe the cone distance of nearest point ultrasonic range finder. Description of drawings The following Figure shows the non-restrictive of the plurality. Figure 1 according to the embodiment of the said 1st is flush with the ground of the detection terminal. Figure 2 shows the bearing of the motor vehicle tire pressure of Figure 1 of the detection terminal. Figure 3 shown by Figure 1 and Figure 2 as shown the detection terminal of the perspective view of the support of the diaphragm. Figure 4 shows according to the 2nd embodiment is flush with the ground of the detection terminal. Figure 5 shows the pressure of the snow of Figure 4 of the detection terminal. Figure 6 according to the 3rd embodiment shown is flush with the ground of the detection terminal. Figure 7 shows the bearing motor vehicle tire pressure of Figure 6 of the detection terminal. Figure 8 said 1st embodiment in the structure of the ultrasonic bending effect. Figure 9 that the integrity of the 1st embodiment according to the double-sensor detection terminal. Figure 10 said that according to the 1st embodiment of the sectional view of the detecting terminal of the double-sensor. Figure 11 said double-sensor detection terminal of the wiring diagram. Figure 12 said single sensor detection terminal of the wiring diagram. Figure 13 with the detecting terminal associated with said electrical signal. Mode of execution In fig. 1 in, according to the 1st embodiment of the detection terminal comprising piezoelectric transducer 1, the piezoelectric transducer through the diaphragm 3 and receive ultrasonic issued 2, the piezoelectric transducer for example through the stuck and fixed on the diaphragm. The diaphragm 3 accept buried in soil 8 of the housing 7 of the opening 5 in. In this set up, the diaphragm 3 is located at the surface of the plants 6 at. The housing 7 containing not produce different electronic component, such as a microprocessor, may be magnetic sensor, battery and radio antenna. Figure 8 to exaggerated way then receives ultrasonic forming mechanism. See from Figure in the piezoelectric transducer and its fixed (adhered) in the structure 11 on the diaphragm 3. Left Figure indicated that he is bending of the diaphragm, namely center rise 41 straight bending of the diaphragm, the rise in the center of the to the structure 11 on the upper portion of. Through the reaction effect (momentum), the side wall bear the downward vertical micro-motion 42. See in the opposite the opposite phase, that negative bending of the diaphragm, so that the structure of the upper part of the drop 43 and structure wall 44 of the upward vertical micro-motion compensation effect. When the sound box, the piezoelectric element generates and transfers to the structure for the movement of the micrometer range, and receive the low when a two to three order of magnitude. The inside of the structure filled with sound insulation foam "barrier layer", in order to prevent possible from the rear part of the structure of the reflection. The diaphragm 3 through the elastic material sealing gasket 9 with the housing 7 is connected, and with the structure 11 is connected. The gasket 9 has a ring shape, and through the glue 10 is affixed to the housing 7 on. Structure 11 has a tubular shape, and is inserted into the housing 7 is also cylindrical groove 13 in. The groove 13 in the opening 5 with the bottom opposite to 15 extending between the. The tubular structure 11 of the slot 13 extends to the bottom of the in 15 is less than a few meters above the zero point of the position of the (àmoins d'une fraction de millimètre). The diaphragm 3 and the tubular structure 11 can form a single component. When in operation, the diaphragm 3 forms the piezoelectric transducer 1 excited oscillation surface. The overall impedance with respect to the structure 11 consistent. Ultrasonic 2 delivered to the hydroxides in 4 on, for example on the housing of the motor vehicle, and to the diaphragm 3 in the direction of reflection. This technology allows the large conical collection (saisie). It can also determine the distance between the ground and the hydroxides. As shown in Figure 2, when the diaphragm when under stress, such as is the detecting terminal running on the motor vehicle tire 17 pressure, elastic gasket 9 to allow the diaphragm 3 shrink. Shrinkage-by structure 11 against the housing 7 is formed in the groove 13 of the bottom 15 of the position determination. To this end, structure 11 with the toothholder 13 the bottom of the 15 about the zero point of a few gap 29. In fig. 1 and 3 in, structure 11 and groove 13 has prevented them from relative rotation of the plane 19, 21. This arrangement provides the piezoelectric transducer 1 and elastic gasket 9 better protection, the motor vehicle driver can be prevented from using the auxiliary steering gear malicious action destroy detection terminal. In fig. 4 and 5 in the illustrated embodiment, the detection terminal is also connected to the ground 6 flush. The piezoelectric transducer 1 is fixed to the diaphragm 3 on, the diaphragm is on the vertical movement through the sound insulation characteristics of the "barrier layer" of the connection part and the structure 11 is connected. The connecting part comprises the diaphragm 3 form a single component of the skirt 23, the skirt can be metal. Said single component closed groove 13 of the opening 5, and through the fixed point 27 is fixed on the casing. In the issue and receive ultrasonic when, about 0.1 mm gap 30 can make the skirt 23 and the diaphragm 3 vibration. When the motor vehicle runs on a detection terminal, structure 11 will be applied to the diaphragm 3 on the pressure is transmitted to the housing 7. Similarly, structure 11 also has the toothholder 13 the bottom of the 15 about the zero point of a few gap. Figure 5 shows the snow when the diaphragm 18 of the pressure diaphragm 3 shrink to the housing 7 of the opening 5 in. Structure 11 is located in the 13 the bottom of the 15 position. In fig. 6 and 7 in the illustrated embodiment, the detection terminal is still connected with the ground 6 flush. The connecting part comprises the skirt 31, the skirt section of the diaphragm 3 form a single component, in order to isolate the vertical micro-motion, the structure 11 comprises a skirt section in the 1st material by the thickness of the thin portion 35 and the 2nd material thinned portion 37 forming a rib 33. The thinned part or the notch can make the vibration area relative to the soleplate and accurately fixed, therefore better control of the vibrating diaphragm 3 mechanical impedance. Still in fig. 6, structure 33 has the toothholder 13 surface 16 about the zero point of a few gap. Figure 7 shows the diaphragm 3 bearing the tire 17 the pressure of the diaphragm contraction to the housing 7 of the opening 5 in. Structure 11 is located in the 13 of the surface 16 of the position. Figure 9 - 13 in more detail from said ground terminal embodiment. Figure 9 said diameter of 18 cm and height of 2.5 cm from the ground terminal 18, the terminal is provided with two integrated in the structure of the ultrasonic sensor, the structure is embedded in the terminal profile in and slightly inclined, in order to drain. In the Figure also see the groove 45, its purpose was to facilitate the drainage, while at the same time lightening the structure on the structure of the wheel caused by the existence of the 11 a portion of the load. Figure 10 said Figure 9 shown at the terminal of the cross section of the ultrasonic sensor. Structure 11 has a diameter of 14 mm, and the height is 10 mm. They through the thickness is 2 mm very soft 1st gasket 9 (the hardness is less than 20 Sh) and to MS - polymer-based elastic rubber 10 is fixed on the shell, the elastic rubber itself is also very soft and in the follow-up operation applied in the rear part of the housing. Therefore the assembly can have not transferred to the a vertical micro-motion. In the graph, it was also found that the bottom of the toothholder 15 about the zero point of a few gap 29. Figure 11 - 13 explained of ultrasonic testing of the basic function, the purpose is to prove that the ultrasonic device with the need for sound insulation of the housing. The measuring principle of the regular to the piezoelectric element characterized in that the transmission has a plurality of periodic pulse train, the frequency of the pulse train is equal to the resonance frequency of the piezoelectric element. Wherein the implementation of the application including a 40 Khz frequency transmission 8 a pulse train. The principle of measuring the reflected wave in the 2nd part, then measuring wave trains transmitting and reflected wave arrival time between, this time with the piezoelectric element and the dissolution of the proportional to the distance between the. Figure 11 circuit said double-sensor device. The double-sensor device comprises a microprocessor MP, about 100 V of the high-pressure source HT, controlled by the microprocessor and in which the wave trains y1 conveying to the transmitting piezoelectric element P1 of the transistor T. The return of the wave received by the receiving piezoelectric element P2 perception. Signal through the AMP amplification, then through element D, R and a C demodulator DEM demodulation, and then transported to the analog input port U of the microprocessor. Figure 12 circuit said single sensor device. The single sensor device and double-circuit of the sensor is similar, the difference is that only the one is installed in the similar in the structure of the piezoelectric element P. The piezoelectric element is used for the pulse, then at the end of the transmission through the switch S conversion to the amplifier. The distinction between the two circuit is characterized in that, in the double detection, with sound insulation improvement, therefore the blind area smaller. In order to 400 kHz rather than 40 Khz work can also be in the blind area reduced a order of magnitude, but it also limited the trucks and detecting critical distance measurement. Figure 13 indicated that regular delivery then the demodulator in response to the outlet of the U of the wave trains y1. In the 1st situation y2 lower, sensor through appropriate sealing gasket - glue assembly member is fixed on the casing. Figure can be seen in the blind area y3, then in time t1 see and after dissolution of the reflections of the waves on the relevant response y4. In the case of 2nd y5 in, sensor through a traditional sealing gasket - glue assembly member (the hardness is greater than 40 Sh) is fixed on the casing. It can be found, the blind area y6 greater, and have internal reflection or virtual reflected excitation y7, wherein the transmitting wave passes through the sealing gasket - rubber area, then reach the edge of the outer cover, in order to return to the detector, and can eventually be to see more small amplitude of the reflection is sought in the y8, then new wave trains y9 immediately following. A detection terminal including a piezoelectric transducer emitting and receiving ultrasound waves via a diaphragm to which it is secured, said diaphragm being arranged opposite an opening of a housing and connected to said housing by connection mechanism. According to the invention, the diaphragm is connected to a rigid structure which enables same, when subjected to pressure, to undergo a contraction limited to the space provided for said purpose, in the opening of the housing, determined by a position of the structure abutting against a surface of the housing opposite the opening. 1. A comprises a fixed on the diaphragm of the piezoelectric transducer detecting terminal, said piezoelectric transducer (1) through the diaphragm (3) send out and receive the ultrasonic wave (2), the diaphragm and the housing (7) of the groove (13) of the opening (5) disposed opposite, said diaphragm through the sound insulation of the connecting part (9, 23, 31) and the housing (7) is connected, and the diaphragm and the structure (11, 33) connected, the inserts in the trough structure (13) and is located in the structure (11, 33) with respect to the groove (13) to the opening (5) opposite the bottom (15) or surface (16) of the gap (29) position, characterized in that the sound insulation of the connecting part (9, 23, 31) allows the diaphragm (3) bearing the pressure to shrink the casing (7) of the opening (5) in the, the shrinkage-by the structure (11, 33) against the housing (7) of the groove (13) of said bottom (15) or surface (16) for determining the position, to allow the housing (7) bear the applied to the diaphragm (3) on the pressure to protect the piezoelectric transducer (1). 2. A comprises a fixed on the diaphragm of the piezoelectric transducer detecting terminal according to Claim 1, characterized in that said structure (11) is tubular, and said connecting part includes a sound insulation the elastic material of the sealing gasket (9). 3. A comprises a fixed on the diaphragm of the piezoelectric transducer detecting terminal according to Claim 1, characterized in that said structure (11) is tubular in shape, and said connecting part includes a skirt (23), the skirt section has connected with the housing and isolate the vertical wave of the skirt section of the connecting part and the diaphragm (3) form a single component. 4. A comprises a fixed on the diaphragm of the piezoelectric transducer detecting terminal as in Claim 2 or Claim 3, characterized in that said structure (11) and the housing (7) is provided with a preventing them from relative rotation of the mutually anti-part (19, 21). 5. A comprises a fixed on the diaphragm of the piezoelectric transducer detecting terminal according to Claim 1, characterized in that the connection part comprises a diaphragm (3) form a single component of the skirt section (31), and said structure (11) comprises a skirt (31) in the 1st material by the thickness of the thinned portion (35) and 2nd material thinned portion (37) forming a rib (33), the flank configured to generate a connected with the housing and isolate the vertical wave part.