Air suspension system

Abstract

The utility model discloses an air suspension system which comprises an air bag unit, an inflation unit and a motor unit, the inflation unit is used for controlling the air bag unit to be inflated or deflated, the inflation unit comprises a piston piece, and the piston piece comprises an inflation state and a deflation state; the motor unit comprises a rotor assembly, a stator assembly, an encoder assembly and a controller, the rotor assembly is used for driving the piston part to reciprocate, the stator assembly is in clearance fit with the periphery of the rotor assembly, and the encoder assembly is used for detecting the rotating speed of the rotor assembly and feeding back a detected signal to the controller; the controller obtains the position of the piston piece according to an output signal of the encoder assembly and judges whether the piston piece is in an inflation state or a deflation state, and then the output torque of the motor unit is adjusted. The position of the rotor can be fed back in real time, so that the rotating speed of the motor is stable, soft start can be realized, the motor can be accurately controlled to operate according to the position of the rotor, and over-high current and even motor damage caused by abrupt load can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of air suspension system in the automobile industry, especially relates to an air suspension system. BACKGROUND

[0002] With the development of the automobile industry, more and more vehicles use air suspension systems to support the vehicle body, so that the vehicle can adjust the suspension height and hardness according to different road conditions and driving conditions. The air suspension pump in the air suspension system is responsible for providing the required air pressure for the overall system, so that the overall system can adjust the vehicle body height by increasing or decreasing the air pressure, thereby ensuring that the vehicle body maintains a stable suspension state during operation. For example, on a highway, the suspension height can be lowered to improve the stability of the vehicle and reduce wind resistance, and when passing through a bumpy road or roadblock, the suspension height can be increased to provide better passability and reduce the impact on the vehicle and passengers. The air suspension system can provide a more comfortable driving experience by adjusting the suspension hardness, and the core component for achieving these functions is the air suspension pump motor.

[0003] Currently, brush air suspension pump motors are mainly used on the market, and the motor itself has no control program, so the motor cannot make corresponding adjustments in real time during operation according to load changes. The load variation rate of the air suspension pump is large, which causes the brush motor speed to fluctuate greatly with load changes, resulting in unstable inflation speed, large motor operation jitter, and high noise. How to monitor the movement of the air suspension pump in real time to provide the required air pressure is a technical problem that needs to be solved at present. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies of the prior art, the utility model provides an air suspension system that can feedback the position of the rotor in real time, so that the motor speed is relatively stable, can be soft-started, and the motor operation can be accurately controlled according to the rotor position, without causing the current to be too high or the motor to be damaged due to sudden load changes.

[0005] The utility model realizes the following technical solutions:

[0006] An air suspension system comprises:

[0007] An air bag unit;

[0008] An inflation unit for controlling the inflation or deflation of the air bag unit, the inflation unit comprising a piston member, the piston member comprising an inflation state and a deflation state;

[0009] The motor unit comprises a rotor assembly, a stator assembly, an encoder assembly and a controller, the rotor assembly is used to drive the reciprocating movement of the piston, the stator assembly is gap-fitted to the periphery of the rotor assembly, the encoder assembly is used to detect the rotating speed of the rotor assembly and feed back the detected signal to the controller, the controller obtains the position of the piston according to the output signal of the encoder assembly and judges whether the piston is in the inflation state or the deflation state, and then adjusts the output torque of the motor unit to provide the preset supporting force for the air bag unit in real time.

[0010] Further, the encoder assembly comprises a magnetic piece and an encoder chip, the magnetic piece is fixed on the rotor assembly, the encoder chip outputs corresponding encoding signals according to the magnetic field signals generated during the rotation of the magnetic piece, and the controller obtains the current position of the rotor assembly according to the encoding signals, and then judges whether the piston is in the inflation state or the deflation state.

[0011] Further, the rotor assembly comprises a rotating shaft, the magnetic piece is fixed on the rotating shaft, and the encoder chip is integrated on the controller and arranged opposite to the magnetic piece.

[0012] Further, the magnetic piece is fixed on the end of the rotating shaft, the encoder chip is arranged in the axial direction of the rotating shaft and spaced apart from the magnetic piece, and the encoder chip is fixed on the controller.

[0013] Further, the magnetic piece is fixed on the side surface of the rotating shaft, and the encoder chip is arranged in the radial direction of the rotating shaft and spaced apart from the magnetic piece.

[0014] Further, the distance between the magnetic piece and the encoder chip is 1-3mm.

[0015] Further, the controller is provided with a relief groove, and the rotating shaft can pass through the relief groove.

[0016] Further, the stator assembly comprises a stator core, the stator core comprises at least two stator iron blocks, and the at least two stator iron blocks form the stator core in a splicing manner.

[0017] Further, the motor unit further comprises a shell, and the stator core is installed on the inner side wall of the shell in an interference or transition fit manner.

[0018] Further, the pole shoes of the stator iron blocks are respectively formed with protrusions and grooves at both ends, and the adjacent stator iron blocks are spliced through the buckling of the protrusions and grooves.

[0019] Further, a through slot is formed at the outer edge of the stator block, and the through slot extends along the axial direction of the stator assembly.

[0020] Further, the through slot is located at the middle position of the pole shoe of the stator block, and the sidewall of the stator block forming the through slot is pressed and inclined inward during the buckling of the plurality of stator blocks.

[0021] Further, the controller is fixed in the shell and located at the axial end of the rotor assembly.

[0022] Further, the shell comprises a body and a cover, and the cover is buckled to the body in the axial direction to form a cavity accommodating the controller.

[0023] Further, the components of the controller are arranged towards the side of the cover.

[0024] Further, a plurality of cooling fins are formed on the outer circumferential surface of the body.

[0025] Further, a bracket is arranged on the inner wall of the shell, and a bearing member is mounted on the bracket to support the rotating shaft.

[0026] Further, the bracket is integrally formed with the shell, and a bearing chamber mounting the bearing member is formed on the bracket.

[0027] Further, an eccentric shaft is arranged at the output end of the rotating shaft, and when the rotor assembly rotates, the rotor assembly drives the rotating shaft to rotate, the rotating shaft drives the eccentric shaft to rotate, and the eccentric shaft can drive the piston of the piston member to reciprocate in the cylinder.

[0028] Compared with the prior art, the utility model has the advantages that:

[0029] 1. The encoder assembly can feedback the position of the rotor assembly in real time, the brushless motor has stable speed, can be started softly, the motor operation can be accurately controlled according to the position of the rotor assembly, and the current is not too high to cause the motor damage due to sudden load.

[0030] 2. The encoder chip and the magnetic member cooperate to monitor the angle of rotation of the rotor assembly in real time at any time and feedback to the controller, the controller can judge that the piston member is in the inflation or deflation state, and can know the real-time position of the piston in the cylinder, so that the control strategy of the piston member is adjusted by adjusting the current and the like, especially the output torque, so that the air suspension system runs more stably and controllably.

[0031] 3. By mounting the encoder chip on the controller, and the mounting position can be flexibly adjusted according to the magnetic member, the magnetic field interference of the motor internal winding can be reduced, and the output control signal is more accurate.

[0032] 4. A through groove is arranged at the outer edge of the stator block, and the through groove extends along the axial direction of the stator assembly, so as to ensure the air flowability and enhance the heat dissipation effect. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 Fig. 1 is a structural schematic view of a motor unit;

[0034] Figure 2 Fig. 2 is a sectional view of the motor unit;

[0035] Figure 3 Fig. 3 is a partial sectional view of the motor unit;

[0036] Figure 4 Fig. 4 is a structural schematic view of a rotating shaft;

[0037] Figure 5 Fig. 5 is a partial structural schematic view of the motor unit.

[0038] 1, rotor assembly; 10, rotating shaft; 100, end portion; 101, mounting groove; 11, eccentric shaft; 2, stator assembly; 20, stator block; 200, protrusion; 201, groove body; 202, through groove; 3, encoder assembly; 30, magnetic member; 31, encoder chip; 4, controller; 5, shell; 50, heat dissipation fin; 51, cover body; 52, cavity; 53, body; 54, support; 540, bearing chamber; 55, bearing member. DETAILED DESCRIPTION

[0039] The utility model discloses further non-restrictive detailed description of technical scheme to the utility model and its drawings in combination with preferred embodiment. In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings. In addition, the terms "first", "second" are only for the purpose of description, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one feature. In the description of the utility model, the meaning of "multiple" is at least two, for example two, three, etc., unless otherwise explicitly specified. The examples described below by referring to the drawings are exemplary, and are intended to explain the utility model, and can not be understood as limiting the utility model.

[0040] As Figures 1-5 The utility model discloses an air suspension system, including air bag unit, inflation unit and motor unit, and inflation unit is used to control air bag unit inflation or deflation, and inflation unit includes piston piece, and piston piece includes inflation state and deflation state, and motor unit is used to provide driving force for the movement of piston piece, and can drive piston piece switches between inflation state and deflation state.

[0041] As Figure 2 The utility model discloses an air suspension system, including air bag unit, inflation unit and motor unit, and inflation unit is used to control air bag unit inflation or deflation, and inflation unit includes piston piece, and piston piece includes inflation state and deflation state, and motor unit is used to provide driving force for the movement of piston piece, and can drive piston piece switches between inflation state and deflation state.

[0042] As Figure 3As shown, the motor unit further comprises an encoder assembly 3 for detecting the rotation speed of the rotor assembly 1 and feeding back the detected signal to a controller 4, and the controller 4 calculates the angle of rotation of the rotor relative to the reference point according to the output signal of the encoder assembly 3, and then converts and obtains the position of the piston, so as to accurately determine whether the piston is in the inflation state or the deflation state in real time, and then adjust the output torque of the motor unit to provide the air bag unit with a preset supporting force in real time to meet different road conditions of the vehicle during driving. By setting the encoder assembly 3, the position of the rotor assembly 1 can be fed back in real time, and combined with the stable characteristics of the brushless motor speed, the motor can be soft-started, and the motor operation can be accurately controlled according to the position of the rotor assembly 1, so that the current is not too high or the motor is not damaged due to sudden load.

[0043] The encoder assembly 3 comprises a magnetic piece 30 and an encoder chip 31. The magnetic piece 30 is fixed on the rotor assembly 1, and the encoder chip 31 is a patch component. Compared with the Hall switch combination scheme, the continuity of the encoder chip 31 is strong, the accuracy of the encoder chip 31 can reach more than 4096 lines, and the angle signal fed back by the encoder chip 31 is almost continuous. In the process of rotation of the rotor assembly 1, the encoder chip 31 outputs a corresponding encoding signal according to the magnetic field signal generated by the magnetic piece 30 during rotation, and the controller 4 obtains the current position of the rotor assembly 1 according to the encoding signal, and then judges whether the piston belongs to the inflation state or the deflation state according to the stroke of the piston rod. Specifically, the cooperation of the encoder chip 31 and the magnetic piece 30 arranged on the shaft 10 can monitor the angle of rotation of the rotor assembly 1 at any time and feed back to the controller 4. The controller 4 can determine whether the piston is in the inflation or deflation state at this time, and can obtain the real-time position of the piston in the cylinder, so as to adjust the control strategy of the piston by adjusting the current and other ways to adjust the output torque, so that the air suspension system runs more stably and controllably, and meets different road conditions of the vehicle during driving.

[0044] In this embodiment, the magnetic piece 30 is fixed on the shaft 10 of the rotor assembly 1, and the encoder chip 31 is integrated on the controller 4 and arranged opposite to the magnetic piece 30. By fixing the encoder chip 31 on the controller 4, the installation position can be flexibly adjusted according to the magnetic piece 30, which can reduce the magnetic field interference of the winding inside the motor, and the output control signal is more accurate.

[0045] In an embodiment of the utility model, magnetic piece 30 is fixed to the end 100 of rotating shaft 10, and encoder chip 31 is arranged in the axial direction of rotating shaft 10 and is spaced apart from magnetic piece 30. In another embodiment of the utility model, magnetic piece 30 is fixed to the side of rotating shaft 10, and encoder chip 31 is arranged in the radial direction of rotating shaft 10 and is spaced apart from magnetic piece 30. At this time, a relief groove (not shown in the figure) is arranged on the controller 4, and the rotating shaft 10 can pass through the relief groove. The distance between magnetic piece 30 and encoder chip 31 is 1-3mm.

[0046] As shown in Figure 4 , the mounting slot 101 is provided on the rotating shaft 10 corresponding to the mounting position of the magnetic piece 30, and the magnetic piece 30 is assembled in the mounting slot 101. The magnetic piece 30 is fixed in the mounting slot, and in an optional real-time mode, the magnetic piece 30 can be fixed in the mounting slot by colloid. In the axial direction, the outer end surface of the magnetic piece 30 is approximately flush with the end surface of the rotating shaft 10.

[0047] The stator assembly 2 comprises a stator core, and the stator core comprises at least two stator iron blocks 20, which form the stator core in a splicing manner. The number of stator iron blocks 20 is preferably 12. Compared with the closed annular structure of the integrated type, the buckling structure of the application, although an additional process is added, the installation error slightly increases, but it can be ensured that within the allowable range, compared with the processing method in the prior art, the application can greatly reduce the generation of waste, and the cost is reduced by 30-45%.

[0048] As shown in Figure 5 , the pole shoes of the stator iron blocks 20 are respectively formed with protrusions 200 and grooves 201, and the adjacent stator iron blocks 20 are spliced by the buckling of the protrusions 200 and the grooves 201. The protrusions 200 can be semicircular, rectangular, zigzag or other irregular shapes, and the grooves 201 are adapted to the shape of the protrusions 200.

[0049] As shown in Figure 5 , the outer edge of the stator iron block 20 is provided with a through groove 202, and the through groove 202 extends along the axial direction of the stator assembly 2. The through groove 202 can ensure the flowability of air and enhance the heat dissipation effect. In addition, the through groove 202 is located at the middle position of the pole shoe of the stator iron block 20, and the sidewall of the stator iron block 20 forming the through groove 202 is extruded and inclined inward during the buckling of the plurality of stator iron blocks 20. It can compensate for the small amount of deformation.

[0050] The motor unit further comprises a housing 5, and the stator core is installed on the inner sidewall of the housing 5 in an interference or transition fit manner.

[0051] The controller 4 is fixed in the shell 5 and located at the axial end of the rotor assembly 1, which reduces the magnetic field interference of the motor internal winding and makes the output control signal more accurate.

[0052] As shown in Figure 2 The shell 5 includes a body 53 and a cover 51, and the cover 51 is axially buckled to the body 53 to form a cavity 52 accommodating the controller 4. The components of the controller 4 are arranged towards the cover 51, and the components of the controller 4 are of different sizes. The above arrangement can better avoid the shaft 10 and other components, and the heat generated by the controller 4 can be dissipated through the cover 51, thereby avoiding heat conduction towards the motor unit as much as possible.

[0053] As shown in Figure 1 A plurality of cooling fins 50 are formed on the outer circumferential surface of the body 53. The cooling fins 50 extend along the axial direction of the body 53, and the plurality of cooling fins 50 are uniformly distributed on the outer circumferential surface of the body 53 in the circumferential direction, so as to increase the contact area between the shell 5 and the external air and improve the heat dissipation effect.

[0054] As shown in Figure 2 The inner wall of the shell 5 is provided with a bracket 54, and the bearing member 55 is installed on the bracket 54 to support the shaft 10. The bracket is integrally formed with the shell 5, and the bracket 54 is provided with a bearing chamber 540 for installing the bearing member 55.

[0055] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An air suspension system characterized by, The application relates to an airbag unit, an inflating unit for controlling the inflation or deflation of the airbag unit, the inflating unit comprising a piston element, the piston element comprising an inflation state and a deflation state, a motor unit, the motor unit comprising a rotor assembly (1) for driving the piston element to reciprocate, a stator assembly (2) gap-fitted to the periphery of the rotor assembly (1), an encoder assembly (3) for detecting the rotating speed of the rotor assembly (1) and feeding back the detected signal to a controller (4), and the controller (4) obtaining the position of the piston element according to the output signal of the encoder assembly (3) and judging whether the piston element is in the inflation state or the deflation state, and then adjusting the output torque of the motor unit to provide a preset supporting force for the airbag unit in real time. The encoder assembly (3) comprises a magnetic element (30) fixed on the rotor assembly (1) and an encoder chip (31) for outputting a corresponding encoding signal according to the magnetic field signal generated during the rotation of the magnetic element (30), and the controller (4) obtains the current position of the rotor assembly (1) according to the encoding signal and then judges whether the piston element is in the inflation state or the deflation state. The rotor assembly (1) comprises a rotating shaft (10), the magnetic element (30) is fixed on the rotating shaft (10), and the encoder chip (31) is integrated on the controller (4) and arranged opposite to the magnetic element (30). The magnetic element (30) is fixed on the end portion (100) of the rotating shaft (10), the encoder chip (31) is arranged in the axial direction of the rotating shaft (10) and spaced apart from the magnetic element (30), and the encoder chip (31) is fixed on the controller (4).

2. The air suspension system of claim 1, wherein, The magnetic element (30) is fixed on the side surface of the rotating shaft (10), and the encoder chip (31) is arranged in the radial direction of the rotating shaft (10) and spaced apart from the magnetic element (30).

3. The air suspension system of claim 2, wherein, The distance between the magnetic element (30) and the encoder chip (31) is 1-3 mm.

4. The air suspension system of claim 3, wherein, The controller (4) is provided with a avoiding groove, and the rotating shaft (10) can pass through the avoiding groove.

5. The air suspension system of claim 3, wherein, The stator assembly (2) comprises a stator core, the stator core comprises at least two stator iron blocks (20), and the at least two stator iron blocks (20) are spliced to form the stator core.

6. The air suspension system of claim 4 or 5, wherein, The motor unit further comprises a shell (5), and the stator core is installed on the inner side wall of the shell (5) in an interference or transition fit mode.

7. The air suspension system of claim 5, wherein, The pole shoes of the stator iron blocks (20) are respectively provided with protrusions (200) and grooves (201) at both ends, and the adjacent stator iron blocks (20) are spliced through the buckling of the protrusions (200) and the grooves (201).

8. The air suspension system of claim 3, wherein, A through groove (202) is formed at the outer edge of the stator iron blocks (20), and the through groove (202) extends along the axial direction of the stator assembly (2).

9. The air suspension system of claim 8, wherein, ​ 10. The air suspension system of claim 8, wherein, ​ 11. The air suspension system of claim 8, wherein, ​ 12. The air suspension system of claim 11, wherein, The through slot (202) is located at the middle position of the pole shoe of the stator iron block (20), and the side wall of the stator iron block (20) forming the through slot (202) is pressed and inclined inward during the buckling of the plurality of stator iron blocks (20).

13. The air suspension system of claim 9, wherein, The controller (4) is fixed in the shell (5) and located at the axial end of the rotor assembly (1).

14. The air suspension system of claim 9, wherein, The shell (5) comprises a body (53) and a cover (51), the cover (51) is buckled to the body (53) in the axial direction to form a cavity (52) accommodating the controller (4).

15. The air suspension system of claim 14, wherein, The components of the controller (4) are arranged towards the side of the cover (51).

16. The air suspension system of claim 14, wherein, A plurality of cooling fins (50) are formed on the outer circumferential surface of the body (53).

17. The air suspension system of claim 9, wherein, A support (54) is arranged on the inner wall of the shell (5), and a bearing member (55) is installed on the support (54) to support the rotating shaft (10).

18. The air suspension system of claim 17, wherein, The support is integrally formed with the shell (5), and a bearing cavity (540) for installing the bearing member (55) is formed on the support (54).

19. The air suspension system of claim 17, wherein, An eccentric shaft (11) is arranged at the output end of the rotating shaft (10), when the rotor assembly (1) rotates, the rotor assembly (1) drives the rotating shaft (10) to rotate, the rotating shaft (10) drives the eccentric shaft (11) to rotate, and the eccentric shaft (11) can drive the piston of the piston member to reciprocate in the cylinder.

Images