Position sensor, shock absorber and vehicle

Abstract

The utility model discloses a position sensor, comprising a first moving part extending along a first direction and capable of reciprocating in the first direction; the first piezoelectric part and the second piezoelectric part are arranged on the first moving part in a spaced mode in the first direction, and the first piezoelectric part and the second piezoelectric part do not move together with the first moving part; the abutting part is arranged between the first piezoelectric part and the second piezoelectric part, the first piezoelectric part generates a first voltage value under pressure, the second piezoelectric part generates a second voltage value under pressure, and the abutting part can synchronously move along with the first moving part; and the control part is used for receiving the first voltage value and the second voltage value. According to the utility model, the displacement direction of the abutting part can be directly judged by comparing the first voltage value with the second voltage value, and the displacement of the abutting part can be directly calculated according to the first voltage value or the second voltage value (namely, the height variation of a vehicle body is directly represented). The utility model further provides a shock absorber and a vehicle.

Description

Technical Field

[0001] The utility model relates to the field of sensors, in particular to a position sensor, a shock absorber and a vehicle. Background Art

[0002] Chassis Height Sensor (also called axle height sensor, vehicle posture sensor, suspension height sensor, etc.) is an essential component used to measure the changes in the front and rear suspension postures of the vehicle. Currently, the vehicle's suspension control system (such as active suspension system, suspension damping control system, air suspension system, etc.) and automatic headlight adjustment system all need to use this sensor to measure changes in the vehicle's driving posture.

[0003] The vehicle height sensor in the prior art is a multi-link structure, which converts the change of the vehicle suspension position into the rotation of the sensor through the connecting rod and the ball joint, and then converts the angle signal into a height signal and outputs it to the vehicle body controller. That is, the vehicle height sensor in the prior art actually measures the angle change and then converts it into a linear displacement change, and cannot directly measure the linear displacement. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problem that the linear displacement of the vehicle body height cannot be directly measured in the prior art. The utility model provides a position sensor that can directly measure the accurate value of the linear displacement of the vehicle body height.

[0005] In order to solve the above technical problems, the embodiment of the utility model discloses a position sensor, comprising:

[0006] a first moving portion, the first moving portion extending along a first direction and capable of reciprocating in the first direction;

[0007] A first piezoelectric portion and a second piezoelectric portion, wherein the first piezoelectric portion and the second piezoelectric portion are spaced apart from each other on the first moving portion along the first direction, and neither the first piezoelectric portion nor the second piezoelectric portion moves together with the first moving portion;

[0008] an abutting portion, the abutting portion being disposed between the first piezoelectric portion and the second piezoelectric portion, the first piezoelectric portion generating a first voltage value when subjected to pressure, the second piezoelectric portion generating a second voltage value when subjected to pressure, and the abutting portion being able to move synchronously with the first moving portion;

[0009] A control unit, configured to receive the first voltage value and the second voltage value;

[0010] The first movable part can switch between a first state, a second state and a third state. When the first movable part is in the first state, the abutment part moves toward the first piezoelectric part; when the first movable part is in the second state, the abutment part moves toward the second piezoelectric part; when the first movable part is in the third state, the abutment part is spaced between the first piezoelectric part and the second piezoelectric part.

[0011] By adopting the above technical solution, since the abutting portion can move synchronously with the first movable portion in the first direction, when the abutting portion moves toward the first piezoelectric portion in the first direction, it will compress the first piezoelectric portion to increase the first voltage value generated by the first piezoelectric portion; when the abutting portion moves toward the second piezoelectric portion in the first direction, it will compress the second piezoelectric portion to increase the second voltage value generated by the second piezoelectric portion.

[0012] By comparing the first voltage value and the second voltage value, the displacement direction of the abutment part (which can be used to indicate the displacement direction of the vehicle body) can be directly determined. The first voltage value and the second voltage value are received by the control part, and the displacement amount of the abutment part can be directly calculated according to the first voltage value or the second voltage value, which indicates the linear displacement change of the vehicle body height.

[0013] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a position sensor, which includes a first shell, the first shell includes a accommodating cavity, the first movable part passes through the first shell and is partially located in the accommodating cavity, and the first piezoelectric part, the second piezoelectric part and the abutting part are all arranged in the accommodating cavity.

[0014] By adopting the above technical solution, the first piezoelectric part, the second piezoelectric part and the abutting part are all arranged in the accommodating cavity of the first shell. The first shell can provide protection for the first piezoelectric part, the second piezoelectric part and the abutting part to prevent the first piezoelectric part and the second piezoelectric part from being disturbed by external forces, thereby improving the displacement measurement accuracy of the position sensor.

[0015] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a position sensor, the control part includes a PCB, the PCB is arranged in the accommodating cavity, when the first voltage value is greater than the second voltage value, the PCB converts the first voltage value into a first displacement value, at which time the first moving part is in the first state;

[0016] When the first voltage value is less than the second voltage value, the PCB is used to convert the second voltage value into a second displacement value, and the first moving part is in the second state.

[0017] By adopting the above technical solution, the PCB compares the first voltage value and the second voltage value, and obtains the first displacement value or the second displacement value accordingly, so as to directly obtain the displacement value of the first moving part to accurately indicate the change in the vehicle body height.

[0018] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a position sensor, the position sensor includes a first pressure portion, along the first direction, the first pressure portion is arranged between the first piezoelectric portion and the abutting portion, and the first pressure portion and the first piezoelectric portion are arranged in contact with each other;

[0019] The second piezoelectric portion includes a second pressure portion. Along the first direction, the second pressure portion is disposed between the second piezoelectric portion and the elastic member. The second pressure portion is disposed in contact with the second piezoelectric portion.

[0020] By adopting the above technical solution, since the first pressure part is arranged in close contact with the first piezoelectric part, and the second pressure part is arranged in close contact with the second piezoelectric part, the first pressure part and the second pressure part can evenly transfer the pressure of the abutting part to the first piezoelectric part and the second piezoelectric part, so that the first piezoelectric part and the second piezoelectric part can stably generate the first voltage value and the second voltage value.

[0021] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a position sensor, the abutment portion includes an elastic member, the first movable portion includes a convex portion, the convex portion is protruded along the second direction on the first movable portion and is connected to the elastic member, and the two ends of the elastic member are respectively abutted against the first piezoelectric portion and the second piezoelectric portion.

[0022] By adopting the above technical solution, a convex portion is provided on the first movable portion, and the convex portion is connected to the elastic member, so that the elastic member can synchronously reciprocate in the first direction with the first movable portion, so as to realize that the linear displacement change of the vehicle body height is synchronously reflected on the elastic member through the first movable portion, so that the displacement of the elastic member is equivalent to the linear displacement of the vehicle body height.

[0023] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses a position sensor, wherein the elastic member includes a spring.

[0024] By adopting the above technical solution, pressure is applied to the first piezoelectric part and the second piezoelectric part by compressing or extending the spring, so that the first voltage value and the second voltage value can be changed evenly.

[0025] An embodiment of the utility model also discloses a shock absorber, wherein the vehicle includes at least a position sensor according to any one of the above embodiments, and the shock absorber includes a second movable part, which can reciprocate along the first direction, and the first movable part of the position sensor is connected to the second movable part, and the first movable part and the second movable part move synchronously.

[0026] With the above technical solution, since the first movable part of the position sensor is connected to the second movable part of the shock absorber, the first movable part can move synchronously with the second movable part, and the height change of the vehicle body is transmitted to the position sensor through the shock absorber.

[0027] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a shock absorber, which also includes a fixed part, and the first shell of the position sensor is arranged on the fixed part. The fixed part includes a cavity, and the second movable part reciprocates in the cavity along the first direction.

[0028] By adopting the above technical solution, the position sensor can be arranged on the shock absorber, thereby reducing the space occupied by the position sensor.

[0029] The embodiment of the utility model further discloses a vehicle, the vehicle at least comprising the shock absorber in any one of the above embodiments, the vehicle comprising a chassis and a chassis swing arm, the second movable portion of the shock absorber being connected to the chassis swing arm;

[0030] When the first moving part of the position sensor is in the first state, the position of the chassis is lowered; when the first moving part is in the second state, the position of the chassis is raised; when the first moving part is in the third state, the position of the chassis remains unchanged.

[0031] By adopting the above technical solution, the second movable part moves through the displacement change of the chassis swing arm, thereby driving the first movable part to move, which can accurately reflect the change of the vehicle body height. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a vehicle height sensor in some embodiments is shown.

[0033] Figure 2 A schematic diagram of the installation of a chassis swing arm and a shock absorber of a position sensor provided in an embodiment of the present application is shown.

[0034] Figure 3 A schematic isometric view of a shock absorber provided in an embodiment of the present application is shown.

[0035] Figure 4 A schematic diagram of an axonometric half section of a position sensor provided in an embodiment of the present application is shown.

[0036] Figure 5 A schematic diagram of an explosion and decomposition of a position sensor provided in an embodiment of the present application is shown.

[0037] Figure 6 A partial schematic diagram of a position sensor provided in an embodiment of the present application is shown.

[0038] Figure 7 A schematic isometric view of a position sensor provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0039] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0040] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0041] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0042] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0043] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0044] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0045] In some embodiments, see Figure 1 The vehicle height sensor includes a first link 11, a second link 12 and an angle sensor, wherein the angle sensor has a swing arm 13, the first link 11 is connected to a lower swing arm 21 of a vehicle chassis 20 through a ball head rod, the second link 12 is connected to the swing arm 13 of the angle sensor, and the lower swing arm 21 is arranged between the tire 30 and the chassis 20. When the vehicle height changes, the lower swing arm 21 will rotate and swing, and at the same time drive the first link 11 and the second link 12 to move, the swing arm 13 of the angle sensor is driven to rotate, and the output signal of the angle sensor changes, which indirectly reflects the change of the vehicle height.

[0046] The vehicle height sensor in the aforementioned technical solution has at least the following disadvantages:

[0047] ①The ball head needs to be pressed into the connecting rod, so the connecting rod must be injection molded with highly elastic TPC soft rubber, which is more expensive;

[0048] ② Grease needs to be applied between the ball groove and the ball head to ensure that the connecting rod can rotate normally;

[0049] ③The connecting rod stiffness is low, which will affect the accuracy of the sensor output signal.

[0050] The position sensor provided in the present application utilizes the piezoelectric effect to measure displacement. The piezoelectric effect refers to the fact that when pressure is applied to a piezoelectric element (i.e., the first piezoelectric portion and the second piezoelectric portion described below), polarization will occur inside the piezoelectric element, and charges of opposite signs will be generated on two surfaces at the same time. When the external force is removed, the material returns to a non-charged state. When the direction of the external force changes, the polarity of the charge also changes accordingly. The amount of charge generated by the material when it is subjected to force is proportional to the magnitude of the external force.

[0051] In some embodiments, see Figure 2 , Figure 3The present application provides a vehicle, which includes a shock absorber 50, a chassis (not shown in the figure), a tire 30 and a chassis swing arm 61. The chassis swing arm 61 connects the tire 30 and the chassis. The shock absorber 50 is arranged on the chassis swing arm 61. When the height of the vehicle body changes with a linear displacement, the chassis swing arm 61 swings and the shock absorber 50 contracts or extends accordingly.

[0052] In some embodiments, the present application further provides a shock absorber 50, the shock absorber 50 includes a position sensor 40 and a second movable part 51, the second movable part 51 of the shock absorber 50 is connected to the chassis swing arm 61, and when the chassis swing arm 61 swings, the second movable part 51 can reciprocate along the first direction X. Exemplarily, the second movable part 51 is provided with a connector 511 at one end away from the first movable part 41 along the first direction X for connecting with the chassis swing arm 61.

[0053] In some embodiments, the shock absorber 50 further includes a fixed portion 52 , and the fixed portion 52 includes a cavity (not shown in the figure), and along the first direction X, the second movable portion 51 reciprocates in the cavity.

[0054] In some embodiments, see Figure 2 , Figure 3 , Figure 4 The position sensor 40 provided in the present application includes a first moving part 41, an abutting part 42, a control part 43, and a first piezoelectric part 44 and a second piezoelectric part 45, wherein the first moving part 41 extends along the first direction X and can reciprocate in the first direction X; the first piezoelectric part 44 and the second piezoelectric part 45 are arranged at intervals on the first moving part 41 along the first direction X, and the first piezoelectric part 44 and the second piezoelectric part 45 do not move with the first moving part 41; the abutting part 42 is arranged between the first piezoelectric part 44 and the second piezoelectric part 45, the first piezoelectric part 44 generates a first voltage value U1 when subjected to pressure, and the second piezoelectric part 45 generates a second voltage value U2 when subjected to pressure, and the abutting part 42 can move synchronously with the first moving part 41; the control part 43 is used to receive the first voltage value U1 and the second voltage value U2.

[0055] The first movable part 41 can switch between a first state, a second state and a third state. When the first movable part 41 is in the first state, the abutment part 42 moves toward the first piezoelectric part 44; when the first movable part 41 is in the second state, the abutment part 42 moves toward the second piezoelectric part 45; when the first movable part 41 is in the third state, the abutment part 42 is spaced between the first piezoelectric part 44 and the second piezoelectric part 45.

[0056] Since the abutment portion 42 can move synchronously with the first movable portion 41 in the first direction X, when the abutment portion 42 moves toward the first piezoelectric portion 44 in the first direction X, it will press the first piezoelectric portion 44 to increase the first voltage value U1 generated by the first piezoelectric portion 44; when the abutment portion 42 moves toward the second piezoelectric portion 45 in the first direction X, it will press the second piezoelectric portion 45 to increase the second voltage value U2 generated by the second piezoelectric portion 45.

[0057] By comparing the first voltage value U1 and the second voltage value U2, the displacement direction of the abutment portion 42 (which can be used to indicate the displacement direction of the vehicle body) can be directly determined. The first voltage value U1 and the second voltage value U2 are received by the control portion 43. The displacement amount of the abutment portion 42 can be directly calculated based on the first voltage value U1 or the second voltage value U2, which indicates the linear displacement change amount of the vehicle body height.

[0058] In some embodiments, the first movable portion 41 is cylindrical and extends along the first direction X, and the abutment portion 42, the first piezoelectric portion 44 and the second piezoelectric portion 45 are all sleeved on the first movable portion 41. It can be understood that the first movable portion 41 can also be other shapes such as a rectangular column, or other forms such as a plate. The present application does not limit the form and shape of the first movable portion 41.

[0059] In some embodiments, the first movable portion 41 of the position sensor 40 is connected to the second movable portion 51 of the shock absorber 50, and the first movable portion 41 and the second movable portion 51 move synchronously. When the position of the chassis is lowered relative to the ground, the chassis swing arm 61 swings to shrink the shock absorber 50, that is, the second movable portion 51 moves toward the cavity along the first direction X, and the first movable portion 41 of the position sensor 40 is in the first state; when the position of the chassis is raised relative to the ground, the chassis swing arm 61 swings to extend the shock absorber 50, that is, the second movable portion 51 moves away from the cavity along the first direction X, and the first movable portion 41 is in the second state; when the position of the chassis remains unchanged, the second movable portion 51 remains relatively still with the cavity in the first direction X, and the first movable portion 41 is in the third state. In some embodiments, refer to Figure 5 , Figure 6 The position sensor 40 includes a first pressure portion 46, which is disposed between the first piezoelectric portion 44 and the abutment portion 42 along the first direction X, and the first pressure portion 46 is fitted with the first piezoelectric portion 44; the second piezoelectric portion 45 includes a second pressure portion 47, which is disposed between the second piezoelectric portion 45 and the elastic member along the first direction X, and the second pressure portion 47 is fitted with the second piezoelectric portion 45.

[0060] Exemplarily, the first pressure portion 46, the second pressure portion 47, the first piezoelectric portion 44 and the second piezoelectric portion 45 are all in annular shape, are all sleeved on the first movable portion 41 and are not in direct contact with the first movable portion 41. The first pressure portion 46, the second pressure portion 47, the first piezoelectric portion 44 and the second piezoelectric portion 45 can also be other shapes such as rectangles, and the present application does not impose any restrictions on this.

[0061] Exemplarily, the position sensor 40 includes a first positive electrode 441, a first negative electrode 442, a second positive electrode 443, and a second negative electrode 444, wherein the first positive electrode 441 and the first negative electrode 442 are bonded to opposite sides of the first piezoelectric portion 44 along the first direction X, at which time the first negative electrode 422 is bonded to the first pressure portion 46 along the first direction X on a side facing away from the first piezoelectric portion 44, and the first positive electrode 441 has a first connecting segment 4411, and the first negative electrode 442 has a second connecting segment 4421, and the first positive electrode 441 and the first negative electrode 442 are electrically connected to the control portion 43 through the first connecting segment 4411 and the second connecting segment 4421, respectively;

[0062] The second positive electrode 443 and the second negative electrode 444 are bonded to two opposite sides of the second piezoelectric portion 45 along the first direction X. At this time, the second negative electrode 444 is bonded to the second pressure portion 47 along the first direction X on the side facing away from the second piezoelectric portion 45, and the second positive electrode 443 has a third connecting segment 4431, and the second negative electrode 444 has a fourth connecting segment 4441. The second positive electrode 443 and the second negative electrode 444 are electrically connected to the control portion 43 through the third connecting segment 4431 and the fourth connecting segment 4441, respectively.

[0063] Exemplarily, the first connecting segment 4411, the second connecting segment 4421, the third connecting segment 4431, and the fourth connecting segment 4441 all extend along the second direction Y, and the first connecting segment 4411 and the second connecting segment 4421 jointly support the first pressure portion 46, the first piezoelectric portion 44, the first positive electrode 441, and the first negative electrode 442, so that the first pressure portion 46, the first piezoelectric portion 44, the first positive electrode 441, and the first negative electrode 442 are not in direct contact with the first movable portion 41; the third connecting segment 4431 and the fourth connecting segment 4441 jointly support the second pressure portion 47, the second piezoelectric portion 45, the second positive electrode 443, and the second negative electrode 444, so that the second pressure portion 47, the second piezoelectric portion 45, the second positive electrode 443, and the second negative electrode 444 are not in direct contact with the second movable portion.

[0064] In some embodiments, the abutment portion 42 includes an elastic member, and the first moving portion 41 includes a convex portion 411, which is convexly arranged on the first moving portion 41 along the second direction Y and connected to the elastic member, and the two ends of the elastic member are respectively abutted against the first piezoelectric portion 44 and the second piezoelectric portion 45. Exemplarily, the elastic member includes a spring, and the convex portion 411 is arranged in the middle of the spring in the first direction X and is clamped on the spring. When the first moving portion 41 moves toward the first pressure portion 46, the convex portion 411 compresses the part of the spring close to the first pressure portion 46, and at the same time extends the part of the spring close to the second pressure portion 47, so that the first voltage value U1 increases and the second voltage value U2 decreases. When the first moving portion 41 moves toward the second pressure portion 47, the convex portion 411 compresses the part of the spring close to the second pressure portion 47, and at the same time extends the part of the spring close to the first pressure portion 46, so that the first voltage value U1 decreases and the second voltage value U2 increases. It can be understood that the elastic member can also be other forms such as a spring sheet, and the present application does not limit this.

[0065] In some embodiments, the control unit 43 includes a PCB, which is disposed in the accommodating cavity. When the first voltage value U1 is greater than the second voltage value U2, the PCB converts the first voltage value U1 into a first displacement value, and the first movable unit 41 is in a first state. When the first voltage value U1 is less than the second voltage value U2, the PCB is used to convert the second voltage value U2 into a second displacement value, and the first movable unit 41 is in a second state.

[0066] Exemplarily, when the first voltage value U1 is greater than the second voltage value U2, the position of the chassis is lowered relative to the ground; when the first voltage value U1 is less than the second voltage value U2, the position of the chassis is raised relative to the ground; when the first voltage value U1 is equal to the second voltage value U2, the position of the chassis remains unchanged relative to the ground.

[0067] In some embodiments, the pressure generated by the spring is F=C×U, where C represents the piezoelectric element constant and U represents the voltage value generated by the piezoelectric element. When the PCB determines that the first voltage value U1 is greater than the second voltage value U2, F=C×U1; when the PCB determines that the first voltage value U1 is less than the second voltage value U2, F=C×U2; when the PCB determines that the first voltage value U1 is equal to the second voltage value U2, U=0, F=C×0.

[0068] After calculating the pressure F generated by the spring through the above scheme, the displacement value of the spring, that is, the linear displacement value of the vehicle body height change, can be obtained according to ΔL=F / K, where ΔL represents the displacement of the elastic member and K represents the spring stiffness coefficient.

[0069] In some embodiments, the selection requirements of the piezoelectric element can also be calculated by presetting the vehicle chassis travel, for example: setting the vehicle chassis travel ±100mm, + indicates that the vehicle chassis position is raised, - indicates that the vehicle chassis position is lowered, when the vehicle chassis position is lowered, that is, when the shock absorber 50 contracts, the spring pressure on the first piezoelectric part 44 increases, and the spring pressure on the second piezoelectric part 45 decreases, at this time U1>U2, if the chassis position is lowered by 100mm, the spring displacement ΔL=100mm, at this time if the spring stiffness coefficient K is set to 0.1N / mm, ΔL=F / K is substituted to obtain F=10N, then the relationship between C and U selected by the first piezoelectric part 44 is C×U1=10. It can be understood that the above technical solution is only an example, and the value of the spring stiffness coefficient K can be set according to actual needs.

[0070] In some embodiments, see Figure 5 , Figure 6 , Figure 7 The position sensor 40 includes a first shell 48, the first shell 48 includes a accommodating cavity 482, the first movable portion 41 passes through the first shell 48 and is partially located in the accommodating cavity 482, the first piezoelectric portion 44, the second piezoelectric portion 45, the first pressure portion 46, the second pressure portion 47 and the abutting portion 42 are all arranged in the accommodating cavity 482.

[0071] Exemplarily, through holes 481 are provided on both sides of the first housing 48 along the first direction X, and the first moving part 41 passes through the through holes 481 and does not contact the first housing 48, that is, when the first moving part 41 reciprocates, the first housing 48 remains stationary. The surface of the first housing 48 is also provided with a vehicle connection hole 483 and a signal output part 484, which can fix the position sensor 40 to other components by bolts and other connecting parts, and the signal output part 484 is used to output the value measured by the position sensor to the control system of the vehicle.

[0072] In some embodiments, reference Figure 7 Combined with Figure 3 The first housing 48 of the position sensor 40 is disposed on the fixing portion 52 of the shock absorber 50 . Exemplarily, a connecting hole 483 is provided on the side of the first housing 48 , and the housing is fixed to the fixing portion 52 through the connecting hole 483 .

[0073] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A position sensor, characterized in that: include: a first moving portion, the first moving portion extending along a first direction and capable of reciprocating in the first direction; A first piezoelectric portion and a second piezoelectric portion, wherein the first piezoelectric portion and the second piezoelectric portion are spaced apart from each other on the first moving portion along the first direction, and neither the first piezoelectric portion nor the second piezoelectric portion moves together with the first moving portion; an abutting portion, the abutting portion being disposed between the first piezoelectric portion and the second piezoelectric portion, the first piezoelectric portion generating a first voltage value when subjected to pressure, the second piezoelectric portion generating a second voltage value when subjected to pressure, and the abutting portion being able to move synchronously with the first moving portion; A control unit, configured to receive the first voltage value and the second voltage value; The first movable part can switch between a first state, a second state and a third state. When the first movable part is in the first state, the abutment part moves toward the first piezoelectric part; when the first movable part is in the second state, the abutment part moves toward the second piezoelectric part; when the first movable part is in the third state, the abutment part is spaced between the first piezoelectric part and the second piezoelectric part.

2. The position sensor according to claim 1, characterized in that: The position sensor includes a first shell, the first shell includes a containing cavity, the first moving part passes through the first shell and is partially located in the containing cavity, and the first piezoelectric part, the second piezoelectric part and the abutting part are all arranged in the containing cavity.

3. The position sensor according to claim 2, characterized in that: The control part includes a PCB, and the PCB is arranged in the accommodating cavity. When the first voltage value is greater than the second voltage value, the PCB converts the first voltage value into a first displacement value, and at this time, the first moving part is in the first state; When the first voltage value is less than the second voltage value, the PCB is used to convert the second voltage value into a second displacement value, and the first moving part is in the second state.

4. The position sensor according to claim 3, characterized in that: The position sensor comprises a first pressure portion, and along the first direction, the first pressure portion is arranged between the first piezoelectric portion and the abutting portion, and the first pressure portion and the first piezoelectric portion are arranged in contact with each other; The second piezoelectric part includes a second pressure part, which is arranged in contact with the second piezoelectric part. The abutting part includes an elastic member. Along the first direction, the second pressure part is arranged between the second piezoelectric part and the elastic member. The first movable part includes a convex part, which is protruding from the first movable part along the second direction and is connected to the elastic member. Two ends of the elastic member abut against the first piezoelectric part and the second piezoelectric part respectively.

5. The position sensor according to claim 4, characterized in that: The elastic member includes a spring.

6. A shock absorber, characterized in that: It includes a position sensor as described in any one of claims 1 to 5, the shock absorber includes a second movable part, the second movable part can reciprocate along the first direction, the first movable part of the position sensor is connected to the second movable part, and the first movable part and the second movable part move synchronously.

7. The shock absorber according to claim 6, characterized in that The shock absorber further includes a fixed portion, the first housing of the position sensor is disposed on the fixed portion, the fixed portion includes a cavity, and the second moving portion reciprocates in the cavity along the first direction.

8. A vehicle, characterized in that: comprising the shock absorber according to any one of claims 6 to 7, the vehicle comprising a chassis and a chassis swing arm, the second movable portion of the shock absorber being connected to the chassis swing arm; When the first movable part of the position sensor is in the first state, the position of the chassis is lowered relative to the ground; when the first movable part is in the second state, the position of the chassis is raised relative to the ground; when the first movable part is in the third state, the position of the chassis remains unchanged relative to the ground.

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