Displacement measuring device, displacement measuring method, shock absorber, suspension system and vehicle

Abstract

The invention relates to a displacement measuring device, a displacement measuring method, a shock absorber, a suspension system and a vehicle. The displacement measuring device comprises a fixed part and a movable part. The movable part is slidably connected with the fixed part. Wherein one of the fixed part and the movable part is provided with a sensor, and the other one is provided with a sensing part. The induction part is configured to act on the sensor so that the sensor can output a signal used for representing the displacement amount after the fixed part and the movable part generate relative displacement. Therefore, the space occupied by the displacement measurement device is reduced, and the precision of displacement measurement is improved.

Description

Technical Field

[0001] The present application relates to the technical field of shock absorbers, and in particular to a displacement measuring device, a displacement measuring method, a shock absorber, a suspension system and a vehicle. Background Art

[0002] The vehicle's body posture information is essential perception information in the vehicle's intelligent chassis control system. In related technologies, a four-bar linkage is usually used to measure the wheel center height in the body posture information. The swing arm, connecting rod and other components in the four-bar linkage not only need to occupy the installation space of the shock absorber, but also require a large envelope space when the swing arm, connecting rod and other components move, resulting in a large space requirement for the shock absorber layout, which is not conducive to its miniaturization design. Summary of the invention

[0003] The embodiments of the present application provide a displacement measuring device, a displacement measuring method, a shock absorber, a suspension system and a vehicle, which simplify the structure of the displacement measuring device, reduce the space occupied by the displacement measuring device, and reduce the measurement error, so as to at least partially solve the above-mentioned technical problems.

[0004] In order to achieve the above object, according to a first aspect of the present application, a displacement measuring device is provided, comprising:

[0005] Fixings;

[0006] A movable part, the movable part is slidably connected to the fixed part;

[0007] Among them, one of the fixed part and the movable part is provided with a sensor, and the other is provided with a sensing part, and the sensing part is configured to act on the sensor so that the sensor outputs a signal for characterizing the displacement after the fixed part and the movable part undergo relative displacement.

[0008] Optionally, the signal output by the sensor is a voltage signal.

[0009] Optionally, the sensor includes:

[0010] An excitation unit, configured to generate a magnetic field in a power-on state;

[0011] an induction unit, configured to generate an induced voltage under the action of the magnetic field;

[0012] Wherein, the induction element is configured to act on the excitation unit and the induction unit, so that when the fixed element and the movable element are in different relative positions, the induction unit generates the induction voltage with different values.

[0013] Optionally, the induction member is a magnetic member, and the induction member is configured to change the magnetic permeability between the excitation unit and the induction unit, so that when the fixed member and the movable member are in different relative positions, the induction unit generates the induced voltage with different values.

[0014] Optionally, the sensor further includes:

[0015] The central control unit is electrically connected to the excitation unit and the induction unit, and is used to supply power to the excitation unit and receive the induction voltage, wherein the central control unit is used to obtain the displacement between the fixed part and the movable part based on the value of the induction voltage.

[0016] Optionally, the central control unit is used to provide alternating current to the excitation unit, and the excitation unit is configured to generate an alternating magnetic field under the action of the alternating current.

[0017] Optionally, the sensing unit includes:

[0018] a first induction coil, electrically connected to the central control unit, the first induction coil being configured to generate a first induced voltage under the action of the alternating magnetic field, and send the first induced voltage to the central control unit;

[0019] a second induction coil, electrically connected to the central control unit, the second induction coil being configured to generate a second induced voltage under the action of the alternating magnetic field, and send the second induced voltage to the central control unit;

[0020] The central control unit is used to obtain the displacement between the fixed part and the movable part based on the first induced voltage and the second induced voltage.

[0021] Optionally, the first induction coil and the second induction coil are both configured to be wavy, and a phase difference between the first induction coil and the second induction coil is 90 degrees.

[0022] Optionally, the first induction coil includes at least two first induction segments that are interconnected and in a sine curve shape, and the second induction coil includes at least two second induction segments that are interconnected and in a cosine curve shape.

[0023] Optionally, the central control unit is used to obtain the displacement between the fixed part and the movable part based on a preset relationship, the first induced voltage and the second induced voltage, and the preset relationship includes a corresponding relationship between the first induced voltage, the second induced voltage and the displacement.

[0024] Optionally, the preset relationship includes:

[0025]

[0026] Wherein, V1 is the first induced voltage, V2 is the second induced voltage, x is the displacement between the fixed part and the movable part, and k is a constant coefficient.

[0027] Optionally, the preset relationship further includes:

[0028] V1 = k sin (x);

[0029] V2 = k cos(x).

[0030] Optionally, the excitation unit includes an excitation coil, and the first induction coil and the second induction coil are both located within a range enclosed by the excitation coil.

[0031] Optionally, the sensor further includes:

[0032] A circuit board, wherein the central control unit, the first induction coil, the second induction coil and the excitation coil are all arranged on the circuit board.

[0033] Optionally, the circuit board has at least two circuit layers, and the first induction coil and the second induction coil are located in different circuit layers; and / or

[0034] The first induction coil and the second induction coil are insulated from each other on the circuit board.

[0035] Optionally, the movable part comprises:

[0036] Piston rod;

[0037] A connecting seat connected to the piston rod;

[0038] A shell connected to the connecting seat, wherein the piston rod is located inside the shell;

[0039] Wherein, the sensor is connected to the piston rod or the housing.

[0040] Optionally, the fixing member includes:

[0041] A cylinder body is movably connected to the shell, and one end of the piston rod away from the connecting seat is inserted into the cylinder body and moves relatively with the cylinder body;

[0042] Wherein, the sensing element is installed on the cylinder body, and along a moving direction perpendicular to the piston rod, the projection of the sensing element and the sensor at least partially overlap.

[0043] According to a second aspect of the present application, a displacement measurement method is provided, which is applied to the displacement measurement device as described above, and the method comprises:

[0044] In response to the relative displacement between the movable member and the fixed member, acquiring a signal output by the sensor;

[0045] Based on the signal, the displacement amount between the fixed member and the movable member is confirmed.

[0046] Optionally, the signal comprises a voltage signal.

[0047] Optionally, the voltage signal includes a first induced voltage and a second induced voltage, the sensor has a preset relationship, and the determining of the displacement between the fixed part and the movable part based on the signal includes:

[0048] Based on the preset relationship, the first induced voltage, and the second induced voltage, a displacement between the fixed part and the movable part is obtained.

[0049] Optionally, the preset relationship includes:

[0050]

[0051] Wherein, V1 is the first induced voltage, V2 is the second induced voltage, x is the displacement between the fixed part and the movable part, and k is a constant coefficient.

[0052] Optionally, the preset relationship further includes:

[0053] V1 = k sin (x);

[0054] V2 = k cos(x).

[0055] According to a third aspect of the present application, a shock absorber is also provided, comprising the displacement measuring device as described above.

[0056] According to a fourth aspect of the present application, a suspension system is also provided, comprising the shock absorber as described above.

[0057] According to a fifth aspect of the present application, a vehicle is also provided, comprising the suspension system as described above.

[0058] In the displacement measuring device, displacement measuring method, shock absorber, suspension system and vehicle of the embodiments of the present application, the mutual induction between the sensor and the sensing member enables the sensor to output a signal for characterizing the displacement based on the relative displacement between the fixed member and the movable member, thereby feeding back the displacement between the fixed member and the movable member. Since the sensor and the sensing member can be directly installed on the fixed member and the movable member, no other connection structure will be introduced to occupy the installation space, thereby reducing the space occupied by the displacement measuring device. In addition, the direct output signal of the sensor and the sensing member to characterize the displacement can also reduce the measurement error and improve the accuracy of the displacement measurement.

[0059] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0061] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0062] Figure 1 is one of the cross-sectional views of a shock absorber provided in an exemplary embodiment of the present application;

[0063] Figure 2 is a second cross-sectional view of a shock absorber provided in an exemplary embodiment of the present application;

[0064] Figure 3 is one of the schematic diagrams of the sensor and the sensing element provided in the exemplary embodiment of the present application;

[0065] Figure 4 is the second schematic diagram of the sensor and the sensing element provided in the exemplary embodiment of the present application;

[0066] Figure 5 yes Figure 4 A magnified schematic diagram of part A;

[0067] Figure 6 is a structural block diagram of a sensor provided in an exemplary embodiment of the present application;

[0068] Figure 7 is a waveform flow diagram of a displacement measurement process provided in an exemplary embodiment of the present application;

[0069] Figure 8 is a graph of induced voltage and displacement provided in an exemplary embodiment of the present application;

[0070] Fig. 9 is a flow chart of a displacement measurement method provided in an exemplary embodiment of the present application.

[0071] Description of reference numerals:

[0072] 1. Fixing part; 11. Cylinder; 12. Bushing; 13. Sealing ring;

[0073] 2. Moving parts; 21. Piston rod; 22. Connecting seat; 23. Housing;

[0074] 3. Sensor; 31. Excitation unit; 311. Excitation coil; 32. Induction unit; 321. First induction coil; 322. Second induction coil; 33. Central control unit; 34. Circuit board; 35. Power supply; 36. Interface circuit;

[0075] 4. Induction parts. DETAILED DESCRIPTION

[0076] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0077] like Figures 1 to 8 As shown, the present application provides a displacement measuring device. The displacement measuring device includes a fixed part 1 and a movable part 2. The movable part 2 is slidably connected to the fixed part 1. One of the fixed part 1 and the movable part 2 is provided with a sensor 3, and the other is provided with a sensing part 4. The sensing part 4 is configured to act on the sensor 3 so that the sensor 3 outputs a signal for characterizing the displacement after the fixed part 1 and the movable part 2 are relatively displaced.

[0078] In the embodiment of the present application, through the mutual induction between the sensor 3 and the inductive element 4, the sensor 3 can output a signal for characterizing the displacement based on the relative displacement between the fixed element 1 and the movable element 2, thereby feeding back the displacement between the fixed element 1 and the movable element 2. Since the sensor 3 and the inductive element 4 can be directly installed on the fixed element 1 and the movable element 2, no other connection structure will be introduced to occupy the installation space, thereby reducing the space occupied by the displacement measuring device. In addition, the direct output signal of the sensor 3 and the inductive element 4 to characterize the displacement can also reduce the measurement error and improve the accuracy of the displacement measurement.

[0079] It is understandable that the displacement measuring device can be applied to the shock absorber of the vehicle. The fixed part 1 and the movable part 2 are both structures of the shock absorber itself. The sensor 3 and the inductive part 4 are connected to the fixed part 1 and the movable part 2, so that the displacement measuring device does not take up additional installation space and the volume of the shock absorber can be reduced. At the same time, the installation process can be simplified and the motion verification step of the displacement measuring device can be omitted. In addition, there is no need to use a mounting bracket to fix the displacement measuring device, saving installation costs, development time and development costs. In addition, the use of connectors can be reduced, thereby reducing cumulative errors and improving measurement accuracy.

[0080] It should be noted that the sensing member 4 is the sensing object of the sensor 3. When the movable member 2 and the fixed member 1 are relatively displaced, the relative position of the sensing member 4 and the sensor 3 will also change, thereby changing the signal output by the sensor 3. Thus, the displacement between the movable member 2 and the fixed member 1 is obtained through the signal output by the sensor 3.

[0081] In some embodiments, the sensor 3 is installed on the fixed part 1 , and the induction part 4 is installed on the movable part 2 .

[0082] In some embodiments, the sensing element 4 is installed on the fixed element 1 , and the sensor 3 is installed on the movable element 2 .

[0083] In some embodiments, the sensor 3 outputs different signals when the fixed part 1 and the movable part 2 are in different relative positions.

[0084] It is understandable that, since the sensor 3 outputs different signals when the fixed part 1 and the movable part 2 are in different relative positions, the relative displacement between the movable part 2 and the fixed part 1 can be directly obtained according to the signal output by the sensor 3 .

[0085] After the sensor 3 outputs a signal based on the relative position of the fixed part 1 and the movable part 2, the displacement corresponding to the signal can be directly obtained by table lookup, function mapping, etc. For example, a mapping table is pre-stored in the central control unit 33 or the vehicle system, and the mapping table has a one-to-one correspondence between the signal and the displacement. After the sensor 3 outputs a signal based on the relative position of the fixed part 1 and the movable part 2, the signal can be sent to the central control unit 33 or the vehicle system, and compared with the pre-stored mapping table, so that the central control unit 33 or the vehicle system outputs the displacement. Alternatively, a functional relationship between the signal and the displacement is pre-stored in the central control unit 33 or the vehicle system. After the sensor 3 outputs a signal based on the relative position of the fixed part 1 and the movable part 2, the signal can be sent to the central control unit 33 or the vehicle system, and the displacement is output based on the functional relationship.

[0086] In some embodiments, the signal output by the sensor 3 is a voltage signal.

[0087] It is understandable that based on the voltage signal, the displacement between the fixed member 1 and the movable member 2 can be determined based on the amplitude of the voltage signal. At the same time, the voltage signal is also convenient for electrical transmission, making signal transmission more convenient and faster.

[0088] In some embodiments, the sensor 3 includes an excitation unit 31 and an induction unit 32. The excitation unit 31 is configured to generate a magnetic field when powered on. The induction unit 32 is configured to generate an induced voltage under the action of the magnetic field. The induction member 4 is configured to act on the excitation unit 31 and the induction unit 32, so that when the fixed member 1 and the movable member 2 are in different relative positions, the induction unit 32 generates an induced voltage of different values.

[0089] It is understandable that the excitation unit 31 generates a magnetic field after being energized, so that the induction unit 32 generates an induced voltage based on the magnetic field. When the relative position between the fixed part 1 and the movable part 2 changes, the effect of the induction member 4 on the excitation unit 31 and the induction unit 32 changes, so that the value of the induced voltage generated by the induction unit 32 changes.

[0090] In some embodiments, the induction member 4 is a magnetic member and is configured to change the magnetic permeability between the excitation unit 31 and the induction unit 32 so that the induction unit 32 generates an induction voltage of different values ​​when the fixed member 1 and the movable member 2 are in different relative positions.

[0091] It can be understood that, based on the fact that the induction unit 32 can generate an induced voltage under the action of a magnetic field, the magnetic permeability between the excitation unit 31 and the induction unit 32 is changed under the action of the induction member 4, and based on the difference in magnetic permeability, the induced voltage generated by the induction unit 32 can be changed. When the movable member 2 and the fixed member 1 are in different relative positions, and the induction member 4 and the induction unit 32 are also in different relative positions, the induction member 4 changes the magnetic permeability at different positions between the excitation unit 31 and the induction unit 32, so that the induction unit 32 outputs induced voltages of different values.

[0092] In some embodiments, the sensor 3 further includes a central control unit 33. The central control unit 33 is electrically connected to the excitation unit 31 and the induction unit 32, and is used to supply power to the excitation unit 31 and receive the induced voltage. The central control unit 33 is used to obtain the displacement between the fixed part 1 and the movable part 2 based on the value of the induced voltage.

[0093] It can be understood that the central control unit 33, as a power supply 35 component of the sensor 3, can supply power to the excitation unit 31 so that the excitation unit 31 can generate a magnetic field. The central control unit 33 can also serve as a control component of the sensor 3, thereby receiving the induced voltage generated by the induction unit 32, and obtaining the displacement between the fixed part 1 and the movable part 2 based on the value of the induction unit 32.

[0094] like Figure 6As shown, the central control unit 33 is connected to a power supply 35. After the power supply 35 supplies power to the central control unit 33, the power is transmitted to the excitation unit 31 through the central control unit 33, so that the excitation unit 31 generates a magnetic field. The central control unit 33 is also connected to an interface circuit 36, which can be connected to the vehicle computer system, so as to send the obtained displacement between the fixed part 1 and the movable part 2 to the vehicle computer system to display the wheel center height.

[0095] In some embodiments, the central control unit 33 can be configured as a MCU (Microcontroller Unit) or a CPU (Central Process Unit).

[0096] In some embodiments, the central control unit 33 is used to provide alternating current to the excitation unit 31. The excitation unit 31 is configured to generate an alternating magnetic field under the action of the alternating current.

[0097] It is understandable that after the central control unit 33 provides alternating current to the excitation unit 31, the excitation unit 31 can generate an alternating magnetic field based on the action of the alternating current. Under the action of the alternating magnetic field, the induction unit 32 generates an induced current.

[0098] It should be noted that the alternating current provided by the central control unit 33 to the excitation unit 31 is an alternating current of fixed frequency and fixed amplitude. According to Faraday's law of induction, the alternating current can cause the excitation unit 31 to generate an alternating magnetic field. When the alternating magnetic field acts on the induction unit 32, an alternating induced voltage can be generated. The amplitude of the alternating induced voltage depends on the magnetic permeability of the surrounding environment. Therefore, based on setting the induction member 4 as a magnetic member, the magnetic permeability between the excitation unit 31 and the induction unit 32 is changed to ensure that when the fixed member 1 and the movable member 2 are in different relative positions, the induction unit 32 generates an induced voltage of different values.

[0099] In some embodiments, the induction unit 32 includes a first induction coil 321 and a second induction coil 322. The first induction coil 321 is electrically connected to the central control unit 33. The first induction coil 321 is configured to generate a first induced voltage under the action of an alternating magnetic field, and send the first induced voltage to the central control unit 33. The second induction coil 322 is electrically connected to the central control unit 33. The second induction coil 322 is configured to generate a second induced voltage under the action of an alternating magnetic field, and send the second induced voltage to the central control unit 33. The central control unit 33 is used to obtain the displacement between the fixed part 1 and the movable part 2 based on the first induced voltage and the second induced voltage.

[0100] It can be understood that the first induction voltage and the second induction voltage are respectively obtained through the first induction coil 321 and the second induction coil 322. Based on the current values ​​of the first induction voltage and the second induction voltage, the central control unit 33 can directly output the displacement between the fixed part 1 and the movable part 2, thereby realizing rapid acquisition of the displacement.

[0101] In the embodiment of the present application, the first induction voltage and the second induction voltage are respectively obtained by the first induction coil 321 and the second induction coil 322 to calculate the displacement between the fixed part 1 and the movable part 2. Based on the setting of two induction coils, the influence of the interfering magnetic field that may be generated can be offset and the influence of temperature changes can be compensated.

[0102] In some embodiments, the first induction coil 321 , the second induction coil 322 and the excitation coil 311 described below may all be configured as multi-strand windings to ensure signal strength.

[0103] In some embodiments, the first induction coil 321 and the second induction coil 322 are both configured in a wave shape. The phase difference between the first induction coil 321 and the second induction coil 322 is 90 degrees.

[0104] It can be understood that based on setting the first induction coil 321 and the second induction coil 322 in a wave shape, when the relative position of the movable part 2 and the fixed part 1 changes, the position between the first induction coil 321, the second induction coil 322 and the excitation unit 31 will change in distance, so that the amplitude of the induced voltage generated by the first induction coil 321 and the second induction coil 322 changes periodically with the position of the coil.

[0105] In the embodiment of the present application, the phase difference between the first induction coil 321 and the second induction coil 322 is set to 90 degrees, so that the change rules of the first induction coil 321 and the second induction coil 322 will be different, so that it is convenient to combine two different induced voltage values ​​to reflect the displacement between the fixed part 1 and the movable part 2. At the same time, the displacement between the fixed part 1 and the movable part 2 can be directly obtained according to the difference between the two values.

[0106] In some embodiments, the phase difference of the first induction coil 321 and the second induction coil 322 is 90 degrees, which means that the wave crests of the first induction coil 321 and the second induction coil 322 are mutually offset. When the first induction coil 321 and the second induction coil 322 form a wavy induction coil structure with a period of 2π, the wave crests of the first induction coil 321 and the second induction coil 322 are offset by 90 degrees.

[0107] In some embodiments, the first induction coil 321 is a symmetrically arranged induction coil, and the second induction coil 322 is also a symmetrically arranged induction coil.

[0108] like Figure 4 and Figure 5 As shown, in some embodiments, the first induction coil 321 includes at least two first induction segments connected to each other and in a sine curve shape. The second induction coil 322 includes at least two second induction segments connected to each other and in a cosine curve shape.

[0109] It can be understood that by setting the first induction coil 321 to a sine curve shape and the second induction coil 322 to a cosine curve shape, it can be ensured that the phase difference between the first induction coil 321 and the second induction coil 322 is 90 degrees. At the same time, the phase difference between the first waveform of the first induced voltage generated by the first induction coil 321 and the second waveform of the second induced voltage generated by the second induction coil 322 is also 90 degrees, so as to facilitate subsequent calculations.

[0110] In some embodiments, the central control unit 33 is used to obtain the displacement between the fixed part 1 and the movable part 2 based on the preset relationship, the first induced voltage and the second induced voltage. The preset relationship includes the corresponding relationship between the first induced voltage, the second induced voltage and the displacement.

[0111] It can be understood that the central control unit 33 can obtain the displacement between the fixed part 1 and the movable part 2 based on the preset relationship, the first induced voltage and the second induced voltage, so as to directly confirm the displacement using the central control unit 33. The preset relationship can be stored in the central control unit 33. Alternatively, the preset relationship can be stored in the memory, and the central control unit 33 calls the preset relationship in the memory to obtain the displacement.

[0112] In some embodiments, the preset relationship can be a table relationship, and the displacement corresponding to the signal can be directly obtained by looking up the table. For example, the central control unit 33 pre-stores a mapping table, and the mapping table has the corresponding relationship between the first induced voltage, the second induced voltage and the displacement. After the first induction coil 321 and the second induction coil 322 send the first induced voltage and the second induced voltage to the central control unit 33, the central control unit 33 can directly obtain the displacement between the fixed part 1 and the movable part 2 through the mapping table.

[0113] In some embodiments, the preset relationship may also be a function mapping relationship, and the displacement corresponding to the signal may be obtained by function calculation. For example, the central control unit 33 pre-stores a function relationship between the first induced voltage, the second induced voltage, and the displacement. After the first induction coil 321 and the second induction coil 322 send the first induced voltage and the second induced voltage to the central control unit 33, the central control unit 33 may directly obtain the displacement between the fixed part 1 and the movable part 2 through the function relationship.

[0114] In some embodiments, the preset relationship includes Wherein, V1 is the first induced voltage, V2 is the second induced voltage, x is the displacement between the fixed part and the movable part, and k is a constant coefficient.

[0115] It can be understood that the first induction coil 321 can obtain the amplitude of V1, and the second induction coil 322 can obtain the amplitude of V2. Therefore, based on the first induction coil 321, the second induction coil 322 and the above-mentioned preset relationship, the displacement x between the fixed part 1 and the movable part 2 can be obtained.

[0116] like Figure 8 As shown, when the measurement range is in the AB segment, the displacement x between the fixed part 1 and the movable part 2 can be directly obtained based on the above preset relationship. Within the range of the AB segment, a y value corresponds to only one x value. That is, after calculating an amplitude difference through V1-V2, it will only correspond to one displacement x.

[0117] It should be noted that the constant coefficient k is determined by parameters such as the material of the first induction coil 321, the material of the second induction coil 322, and the distance between the first induction coil 321 and the second induction coil 322. For the same shock absorber, the constant coefficient k is a fixed value.

[0118] In some embodiments, the preset relationship further includes V1=k sin(x) and V2=k cos(x).

[0119] After the first induction coil 321 and the second induction coil 322 are preliminarily set, the preset relationship between the first induction coil 321 and the displacement can be: V1 = k1sin(x) + b1, and the preset relationship between the second induction coil 322 and the displacement can be: V2 = k2cos(x) + b2. By calibrating the sensor 3 and processing the data, b1 and b2 can be eliminated, and k1 = k2 = k, so that V1 = k sin(x) and V2 = k cos(x). This facilitates the calculation of V1-V2.

[0120] like Figure 8 As shown, when the measured range is the OC segment, the same y value can correspond to two x values. That is, two displacements are calculated through V1-V2. At this time, based on V1-V2, combined with V1=k sin(x) and V2=k cos(x), the actual displacement can be determined. That is, the two calculated displacements are re-submitted into V1=k sin(x) and V2=k cos(x), and the displacement that satisfies the actual measured V1 and V2 values ​​is the displacement between the movable part 2 and the fixed part 1.

[0121] It should be noted that, in order to prevent the measurement results from having periodic repeatability, the displacement range measured by the first induction coil 321 and the second induction coil 322 does not exceed one 2π. That is, the magnitudes of V1, V2 and V1-V2 are obtained only within one cycle of the sine function, and combined with the above-mentioned preset relationship, a unique displacement is obtained. The displacement corresponding to the one cycle will satisfy the maximum displacement and minimum displacement of the movable part 2 and the fixed part 1 on the shock absorber, so as to ensure that all displacement conditions can be measured.

[0122] In some embodiments, the excitation unit 31 includes an excitation coil 311 . The first induction coil 321 and the second induction coil 322 are both located within a range enclosed by the excitation coil 311 .

[0123] like Figure 7 As shown, the excitation coil 311 is electrically connected to the central control unit 33, and the central control unit 33 provides alternating current to the excitation coil 311, so that the excitation coil 311 can generate an alternating magnetic field. After the alternating magnetic field acts on the first induction coil 321 and the second induction coil 322, the first induction coil 321 and the second induction coil 322 can generate a first induced voltage and a second induced voltage respectively. When the first induction coil 321 and the second induction coil 322 are not acted on by the induction element 4, the magnetic permeability between the first induction coil 321 and the excitation coil 311 and the magnetic permeability between the second induction coil 322 and the excitation coil 311 basically do not change. Under the action of the magnetic induction element 4, the magnetic permeability between the excitation coil 311 and the first induction coil 321 and the magnetic permeability between the excitation coil 311 and the second induction coil 322 can be increased, thereby causing a measurable change in the induced voltage. As a result, the first induced voltage and the second induced voltage received by the central control unit 33 change periodically.

[0124] It should be noted that the excitation coil 311 can be set to a square shape and enclose the first induction coil 321 and the second induction coil 322. The induction element 4 can be set to a ring shape, and the distribution direction of the induction element 4 is perpendicular to the extension direction of the circuit board 34. That is, the distribution direction of the induction element 4 is perpendicular to the extension direction of the first induction coil 321, the extension direction of the second induction coil 322, and the extension direction of the excitation coil 311. Figure 5 As shown, at the location of the induction element 4, the distance between the first induction coil 321 and the excitation coil 311 is H1, and the distance between the second induction coil 322 and the excitation coil 311 is H2. When H1 is less than H2, the first induced voltage generated by the first induction coil 321 is less than the second induced voltage generated by the second induction coil 322. When H1 is greater than H2, the first induced voltage generated by the first induction coil 321 is greater than the second induced voltage generated by the second induction coil 322.

[0125] like Figure 3 and Figure 4 As shown, in some embodiments, the sensor 3 further includes a circuit board 34. The central control unit 33, the first induction coil 321, the second induction coil 322 and the excitation coil 311 are all disposed on the circuit board 34.

[0126] It can be understood that the central control unit 33 is disposed on the circuit board 34, and the first induction coil 321, the second induction coil 322 and the excitation coil 311 are all printed on the circuit board 34. When printing the first induction coil 321, the second induction coil 322 and the excitation coil 311, both ends of the first induction coil 321, the second induction coil 322 and the excitation coil 311 are connected to the central control unit 33 to achieve electrical connection between each coil and the central control unit 33.

[0127] In some embodiments, the circuit board 34 has at least two circuit layers. The first induction coil 321 and the second induction coil 322 are located in different circuit layers. And / or, the first induction coil 321 and the second induction coil 322 are insulated from each other on the circuit board 34 .

[0128] It is understandable that the circuit board 34 includes at least two circuit layers, and the first induction coil 321 and the second induction coil 322 are respectively arranged in different circuit layers to achieve relative insulation between the first induction coil 321 and the second induction coil 322. Alternatively, in some embodiments, the first induction coil 321 and the second induction coil 322 are located in the same circuit layer, and the two are insulated from each other. The mutual insulation arrangement includes: an insulating device is arranged at the connection between the first induction coil 321 and the second induction coil 322.

[0129] In some embodiments, the movable member 2 includes a piston rod 21, a connection seat 22 and a housing 23. The connection seat 22 is connected to the piston rod 21. The housing 23 is connected to the connection seat 22. The piston rod 21 is located in the housing 23. The sensor 3 is connected to the piston rod 21 or the housing 23.

[0130] It is understandable that the piston rod 21 can drive the connection seat 22 and the housing 23 to move synchronously. The sensor 3 is arranged inside the piston rod 21, on the outer surface of the piston rod 21, on the inner surface of the housing 23, or on the outer surface of the housing 23, so that the sensor 3 can move relatively. Thus, the change in the position of the sensor 3 can directly reflect the change in the position of the piston rod 21, thereby reflecting the displacement of the piston rod 21 based on the induced voltage of the sensor 3.

[0131] It should be noted that the housing 23 can be used as a dust cover for the shock absorber. The connecting seat 22 can be used to connect the upper support member of the shock absorber.

[0132] In some embodiments, the fixing member 1 includes a cylinder 11. The cylinder 11 is movably connected to the housing 23. The end of the piston rod 21 away from the connecting seat 22 is inserted into the cylinder 11 and moves relative to the cylinder 11. The sensing member 4 is installed on the cylinder 11. Along the moving direction perpendicular to the piston rod 21, the projections of the sensing member 4 and the sensor 3 at least partially overlap.

[0133] It can be understood that the piston rod 21 moves relative to the cylinder 11, based on the fact that the sensor 3 is relatively fixed to the piston rod 21, and the induction element 4 is relatively fixed to the cylinder 11. Therefore, when the piston rod 21 moves, the sensor 3 and the induction element 4 can move relative to each other, so that the induction element 4 outputs different induction voltages based on different positions, so as to provide real-time feedback on the displacement of the piston rod 21.

[0134] In the embodiment of the present application, the projections of the sensing element 4 and the sensor 3 are at least partially overlapped along a direction perpendicular to the movement of the piston rod 21. As a result, the sensing element 4 can act on the sensor 3 to cause a measurable change in the induced voltage of the sensor 3, thereby ensuring that the displacement of the piston rod 21 can be reflected by the value of the induced voltage.

[0135] like Figure 1 As shown, in some embodiments, the interior of the cylinder 11 is hollow, and the sensor 4 is installed in the cylinder 11. Figure 2 As shown, in some embodiments, the sensing element 4 is installed outside the cylinder 11 .

[0136] like Figure 1 and Figure 2 As shown, a bushing 12 is connected to one end of the cylinder 11 away from the housing 23, and the bushing 12 is used to connect the shock absorber to other structural parts of the vehicle. The cylinder 11 can also be provided with a sealing ring 13 to achieve a sealed connection between the piston rod 21 and the cylinder 11.

[0137] By arranging the sensor 3 on the piston rod 21 and the induction element 4 on the cylinder 11, the arrangement process of the displacement measuring device can be simplified and the calibration step of the displacement measuring device can be omitted. At the same time, there are no moving parts such as a four-bar linkage, which reduces the risk of bumps and collisions. There is no need to set up a mounting bracket, which can save development time and development costs and realize modular design. The structure can also remove intermediate parts, reduce error accumulation, and improve measurement accuracy.

[0138] In the embodiment of the present application, the displacement of the piston rod 21 is directly converted into an electrical signal to form displacement information, without the need for conversion through other parameters such as angles. This makes the measurement more direct, reduces intermediate conversion links, and makes the accuracy more accurate.

[0139] According to a second aspect of the present application, a displacement measurement method is provided, which is applied to the above-mentioned displacement measurement device. The displacement measurement method has all the beneficial effects of the above-mentioned displacement measurement device, which will not be described in detail in the present application.

[0140] like Fig. 9 As shown, the method includes:

[0141] S910 , in response to the relative displacement between the movable member 2 and the fixed member 1 , obtaining a signal output by the sensor 3 .

[0142] S920 , confirming the displacement between the fixed part 1 and the movable part 2 based on the signal.

[0143] In the embodiment of the present application, through the mutual induction between the sensor 3 and the inductive element 4, the sensor 3 can output a signal for characterizing the displacement based on the relative displacement between the fixed element 1 and the movable element 2, thereby feeding back the displacement between the fixed element 1 and the movable element 2. Since the sensor 3 and the inductive element 4 can be directly installed on the fixed element 1 and the movable element 2, no other connection structure will be introduced to occupy the installation space, thereby reducing the space occupied by the displacement measuring device. In addition, the direct output signal of the sensor 3 and the inductive element 4 to characterize the displacement can also reduce the measurement error and improve the accuracy of the displacement measurement.

[0144] In some embodiments, the signal is a voltage signal.

[0145] It is understandable that based on the voltage signal, the displacement between the fixed member 1 and the movable member 2 can be determined based on the amplitude of the voltage signal. At the same time, the voltage signal is also convenient for electrical transmission, making signal transmission more convenient and faster.

[0146] In some embodiments, the voltage signal includes a first induced voltage and a second induced voltage. The sensor 3 has a preset relationship. Based on the signal, the displacement between the fixed part 1 and the movable part 2 is determined, including:

[0147] Based on the preset relationship, the first induced voltage and the second induced voltage, the displacement between the fixed member 1 and the movable member 2 is obtained.

[0148] It can be understood that by setting a preset relationship in the sensor 3 , the sensor 3 can obtain the displacement between the fixed part 1 and the movable part 2 based on the preset relationship, the first induced voltage and the second induced voltage.

[0149] In some embodiments, the preset relationship may be a table relationship, and the displacement corresponding to the signal can be directly obtained by looking up the table. For example, a mapping table is pre-stored in the central control unit 33 of the sensor 3, and the mapping table has the corresponding relationship between the first induced voltage, the second induced voltage and the displacement. After the first induction coil 321 and the second induction coil 322 send the first induced voltage and the second induced voltage to the central control unit 33, the central control unit 33 can directly obtain the displacement between the fixed part 1 and the movable part 2 through the mapping table.

[0150] In some embodiments, the preset relationship may also be a function mapping relationship, and the displacement corresponding to the signal may be obtained by function calculation. For example, the central control unit 33 of the sensor 3 pre-stores a function relationship between the first induced voltage, the second induced voltage, and the displacement. After the first induction coil 321 and the second induction coil 322 send the first induced voltage and the second induced voltage to the central control unit 33, the central control unit 33 may directly obtain the displacement between the fixed part 1 and the movable part 2 through the function relationship.

[0151] In some embodiments, the preset relationship includes: Wherein, V1 is the first induced voltage, V2 is the second induced voltage, x is the displacement between the fixed part and the movable part, and k is a constant coefficient.

[0152] It can be understood that the first induction coil 321 can obtain the amplitude of V1, and the second induction coil 322 can obtain the amplitude of V2. Therefore, based on the first induction coil 321, the second induction coil 322 and the above-mentioned preset relationship, the displacement x between the fixed part 1 and the movable part 2 can be obtained.

[0153] like Figure 8 As shown, when the measurement range is in the AB segment, the displacement x between the fixed part 1 and the movable part 2 can be directly obtained based on the above preset relationship. Within the range of the AB segment, a y value corresponds to only one x value. That is, after calculating an amplitude difference through V1-V2, it will only correspond to one displacement x.

[0154] It should be noted that the constant coefficient k is determined by parameters such as the material of the first induction coil 321, the material of the second induction coil 322, and the distance between the first induction coil 321 and the second induction coil 322. For the same shock absorber, the constant coefficient k is a fixed value.

[0155] In some embodiments, the preset relationship further includes: V1 = k sin (x) and V2 = k cos (x).

[0156] After the first induction coil 321 and the second induction coil 322 are preliminarily set, the preset relationship between the first induction coil 321 and the displacement can be: V1 = k1sin(x) + b1, and the preset relationship between the second induction coil 322 and the displacement can be: V2 = k2cos(x) + b2. By calibrating the sensor 3 and processing the data, b1 and b2 can be eliminated, and k1 = k2 = k, so that V1 = k sin(x) and V2 = k cos(x). This facilitates the calculation of V1-V2.

[0157] like Figure 8 As shown, when the measured range is the OC segment, the same y value can correspond to two x values. That is, two displacements are calculated through V1-V2. At this time, based on V1-V2, combined with V1=k sin(x) and V2=k cos(x), the actual displacement can be determined. That is, the two calculated displacements are re-submitted into V1=k sin(x) and V2=k cos(x), and the displacement that satisfies the actual measured V1 and V2 values ​​is the displacement between the movable part 2 and the fixed part 1.

[0158] It should be noted that, in order to prevent the measurement results from having periodic repeatability, the displacement range measured by the first induction coil 321 and the second induction coil 322 does not exceed one 2π. That is, the magnitudes of V1, V2 and V1-V2 are obtained only within one cycle of the sine function, and combined with the above-mentioned preset relationship, a unique displacement is obtained. The displacement corresponding to the one cycle will satisfy the maximum displacement and minimum displacement of the movable part 2 and the fixed part 1 on the shock absorber, so as to ensure that all displacement conditions can be measured.

[0159] According to a third aspect of the present application, a shock absorber is provided, which includes the displacement measuring device as described above. The shock absorber has all the beneficial effects of the displacement measuring device described above, which will not be described in detail in the present application.

[0160] According to a fourth aspect of the present application, a suspension system is provided, the suspension system comprising the shock absorber as described above. The suspension system has all the beneficial effects of the shock absorber described above, which will not be described in detail in the present application.

[0161] According to a fifth aspect of the present application, a vehicle is provided, which includes the above-mentioned suspension system. The vehicle has all the beneficial effects of the above-mentioned suspension system, which will not be described in detail in the present application.

[0162] The vehicle may be a fuel vehicle, a plug-in hybrid vehicle or a new energy vehicle, etc., and this application does not make any specific limitation on this.

[0163] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0164] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0165] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0166] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A displacement measuring device, characterized in that: include: Fixings; A movable part, slidably connected to the fixed part; Among them, one of the fixed part and the movable part is provided with a sensor, and the other is provided with a sensing part, and the sensing part is configured to act on the sensor so that the sensor outputs a signal for characterizing the displacement after the fixed part and the movable part undergo relative displacement.

2. The displacement measuring device according to claim 1, characterized in that: The signal output by the sensor is a voltage signal.

3. The displacement measuring device according to claim 2, characterized in that: The sensor comprises: An excitation unit, configured to generate a magnetic field in a power-on state; an induction unit, configured to generate an induced voltage under the action of the magnetic field; Wherein, the induction element is configured to act on the excitation unit and the induction unit, so that when the fixed element and the movable element are in different relative positions, the induction unit generates the induction voltage with different values.

4. The displacement measuring device according to claim 3, characterized in that: The induction member is a magnetic member, and the induction member is configured to change the magnetic permeability between the excitation unit and the induction unit, so that when the fixed member and the movable member are in different relative positions, the induction unit generates the induction voltage with different values.

5. The displacement measuring device according to claim 4, characterized in that: The sensor also includes: The central control unit is electrically connected to the excitation unit and the induction unit, and is used to supply power to the excitation unit and receive the induction voltage, wherein the central control unit is used to obtain the displacement between the fixed part and the movable part based on the value of the induction voltage.

6. The displacement measuring device according to claim 5, characterized in that: The central control unit is used to provide alternating current to the excitation unit, and the excitation unit is configured to generate an alternating magnetic field under the action of the alternating current.

7. The displacement measuring device according to claim 6, characterized in that: The sensing unit comprises: a first induction coil, electrically connected to the central control unit, the first induction coil being configured to generate a first induced voltage under the action of the alternating magnetic field, and send the first induced voltage to the central control unit; a second induction coil, electrically connected to the central control unit, the second induction coil being configured to generate a second induced voltage under the action of the alternating magnetic field, and send the second induced voltage to the central control unit; The central control unit is used to obtain the displacement between the fixed part and the movable part based on the first induced voltage and the second induced voltage.

8. The displacement measuring device according to claim 7, characterized in that: The first induction coil and the second induction coil are both configured to be in a wave shape, and a phase difference between the first induction coil and the second induction coil is 90 degrees.

9. The displacement measuring device according to claim 8, characterized in that: The first induction coil includes at least two first induction segments connected to each other and in a sine curve shape, and the second induction coil includes at least two second induction segments connected to each other and in a cosine curve shape.

10. The displacement measuring device according to claim 7, characterized in that: The central control unit is used to obtain the displacement between the fixed part and the movable part based on a preset relationship, the first induced voltage and the second induced voltage, and the preset relationship includes a corresponding relationship between the first induced voltage, the second induced voltage and the displacement.

11. The displacement measuring device according to claim 10, characterized in that: The preset relationship includes: Wherein, V1 is the first induced voltage, V2 is the second induced voltage, x is the displacement between the fixed part and the movable part, and k is a constant coefficient.

12. The displacement measuring device according to claim 11, characterized in that: The preset relationship also includes: V1＝ksi n n ((x); V2 = k cos(x.

13. The displacement measuring device according to claim 7, characterized in that: The excitation unit includes an excitation coil, and the first induction coil and the second induction coil are both located within a range enclosed by the excitation coil.

14. The displacement measuring device according to claim 13, characterized in that: The sensor also includes: A circuit board, wherein the central control unit, the first induction coil, the second induction coil and the excitation coil are all arranged on the circuit board.

15. The displacement measuring device according to claim 14, characterized in that: The circuit board has at least two circuit layers, and the first induction coil and the second induction coil are located in different circuit layers; and / or The first induction coil and the second induction coil are insulated from each other on the circuit board.

16. The displacement measuring device according to any one of claims 1 to 15, characterized in that: The movable parts include: Piston rod; A connecting seat connected to the piston rod; A shell connected to the connecting seat, wherein the piston rod is located inside the shell; Wherein, the sensor is connected to the piston rod or the housing.

17. The displacement measuring device according to claim 16, characterized in that: The fixing member comprises: A cylinder body is movably connected to the shell, and one end of the piston rod away from the connecting seat is inserted into the cylinder body and moves relatively with the cylinder body; Wherein, the sensing element is installed on the cylinder body, and along a moving direction perpendicular to the piston rod, the projection of the sensing element and the sensor at least partially overlap.

18. A displacement measurement method, characterized in that: Applied to the displacement measuring device according to any one of claims 1 to 17, the method comprises: In response to the relative displacement between the movable member and the fixed member, acquiring a signal output by the sensor; Based on the signal, the displacement amount between the fixed member and the movable member is confirmed.

19. The method according to claim 18, characterized in that The signal comprises a voltage signal.

20. The method according to claim 19, characterized in that The voltage signal includes a first induced voltage and a second induced voltage, and the determining of the displacement between the fixed part and the movable part based on the signal includes: Based on the preset relationship, the first induced voltage, and the second induced voltage, the displacement between the fixed part and the movable part is obtained.

21. The method according to claim 20, characterized in that The preset relationship includes: Wherein, V1 is the first induced voltage, V2 is the second induced voltage, x is the displacement between the fixed part and the movable part, and k is a constant coefficient.

22. The method according to claim 21, characterized in that The preset relationship also includes: V1＝ksi n n ((x); V2 = kcoss((x).

23. A shock absorber, characterized in that: Comprising a displacement measuring device as claimed in any one of claims 1 to 17.

24. A suspension system, characterized in that: Comprising a vibration damper as claimed in claim 23.

25. A vehicle, characterized in that: Comprising a suspension system as claimed in claim 24.

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