Shock absorber assembly, vehicle and vehicle shock absorbing control method

Abstract

The application discloses a shock absorber assembly, a vehicle and a vehicle damping control method, and belongs to the technical field of vehicle damping. The shock absorber assembly comprises a shock absorber body, a working cylinder body provided with a sliding chamber, and a piston slidingly arranged in the sliding chamber, wherein the piston divides the sliding chamber into a recovery chamber and a compression chamber; a first external pipeline connected with the recovery chamber and the compression chamber at two ends; a digital incremental valve arranged on the first external pipeline; an accumulator in communication with the first external pipeline and located on the side of the digital incremental valve away from the recovery chamber; a compression compensation valve arranged on the piston and used for connecting the recovery chamber and the compression chamber during compression; and a recovery compensation valve arranged on the first external pipeline and located on the side of the accumulator close to the compression chamber and used for connecting the compression chamber and the accumulator during recovery. The application accelerates the response speed of the shock absorber, avoids the influence of oil resistance, improves the control precision of damping force, and reduces the wiring difficulty.

Description

Technical Field

[0001] This invention relates to the field of vehicle shock absorption technology, and in particular to a shock absorber assembly, a vehicle, and a vehicle shock absorption control method. Background Technology

[0002] Existing patent CN1699781A, "Hydraulic Shock Absorber with Actively Adjustable Damping for Semi-Active Vehicle Suspension," discloses a hydraulic shock absorber with actively adjustable damping. It includes a damping control unit composed of multiple high-speed electromagnetic switching valves connected in series and fixed damping valves connected in parallel, forming a hydraulically adjustable damping control valve. By using five electromagnetic valves connected in series and parallel, the magnitude of the damping force can be determined by the number and sequence of valve opening. During the recovery and compression processes, the opening degree of the electromagnetic valves differs.

[0003] However, in actual control, due to the very short recovery and compression process time, the solenoid valve core cannot quickly reach the response position due to the internal armature and oil resistance of the solenoid valve, which ultimately leads to the inaccurate control of the damping force; moreover, multiple solenoid valves need to be installed, increasing the difficulty of wiring.

[0004] Therefore, there is an urgent need to provide a shock absorber assembly, a vehicle, and a vehicle damping control method to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a shock absorber assembly, a vehicle, and a vehicle shock absorption control method, which accelerates the response speed, avoids the influence of oil resistance, improves the control accuracy of damping force, and reduces wiring difficulty.

[0006] To achieve the above objectives, the following technical solution is provided:

[0007] The shock absorber assembly includes:

[0008] The shock absorber body includes a working cylinder with a sliding chamber inside and a piston slidably disposed in the sliding chamber, wherein the piston divides the sliding chamber into a recovery chamber and a compression chamber;

[0009] The first external conduit is connected at both ends to the restoration chamber and the compression chamber, respectively.

[0010] A digital incremental valve is installed on the first external pipeline;

[0011] An energy accumulator is connected to the first external pipeline and is located on the side of the digital incremental valve away from the recovery chamber.

[0012] A compression compensation valve is disposed on the piston and is used to connect the recovery chamber and the compression chamber during compression.

[0013] A recovery compensation valve is installed on the first external pipeline and located on the side of the accumulator close to the compression chamber, for connecting the compression chamber and the accumulator during recovery.

[0014] As an optional solution for the shock absorber assembly, it also includes a second external pipeline and a compression valve disposed on the second external pipeline. The second external pipeline is disposed in parallel at both ends of the recovery compensation valve, and the opening stiffness of the compression valve is greater than the opening stiffness of the compression compensation valve.

[0015] As an optional solution for the shock absorber assembly, a recovery valve is also included. The recovery valve is disposed on the piston and is used to connect the recovery chamber and the compression chamber during recovery. The opening stiffness of the recovery valve is greater than the opening stiffness of the recovery compensation valve.

[0016] As an optional solution for the shock absorber assembly, the digital incremental valve includes a valve body and a slide valve, a ball screw, and a stepper motor coaxially disposed within the valve body. The oil inlet of the valve body is connected to the recovery chamber through the first external pipeline, and the oil outlet of the valve body is connected to the accumulator through the first external pipeline.

[0017] As an optional solution for the shock absorber assembly, the digital incremental valve also includes a position sensor disposed within the valve body for detecting the distance the slide valve has moved.

[0018] As an optional solution for the shock absorber assembly, the recovery compensation valve includes a first check valve, the outlet of which is connected to the compression chamber, and the inlet of which is connected to the accumulator.

[0019] As an optional solution for the shock absorber assembly, the compression valve includes a second check valve, the inlet of which is connected to the compression chamber, and the outlet of which is connected to the accumulator.

[0020] The vehicle includes the shock absorber assembly described above.

[0021] As an optional vehicle configuration, the shock absorber assembly is provided between the vehicle's chassis and each wheel.

[0022] A vehicle shock absorption control method for adjusting the damping force of the shock absorber assembly as described above includes the following steps:

[0023] Collect driver's actions and signals from position sensors;

[0024] The vehicle's status is determined based on the collected signals, and the required damping force for the vehicle is calculated.

[0025] Start the stepper motor to move the slide valve to the set position.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] The shock absorber assembly provided by this invention connects the shock absorber body, digital incremental valve, accumulator, and recovery compensation valve in series via a first external pipeline. A compression compensation valve is installed on the piston of the shock absorber body. During compression, the piston moves downward, directing the hydraulic oil in the compression chamber through the compression compensation valve to the recovery chamber, digital incremental valve, and accumulator. A recovery compensation valve is installed on the side of the first external pipeline near the compression chamber of the shock absorber body. During recovery, the piston moves upward, increasing the volume of the compression chamber and decreasing the internal pressure. The hydraulic oil flows from the recovery chamber into the digital incremental valve and then through the accumulator. The hydraulic oil in the accumulator then flows through the recovery compensation valve. The hydraulic oil flows to the compression chamber for rapid filling. During one cycle of compression and recovery, the hydraulic oil flows from the compression chamber to the recovery chamber, and then back to the compression chamber via the accumulator, thus achieving the recycling of hydraulic oil. A digital incremental valve replaces the traditional solenoid valve. The controller sends pulses to control the opening of the digital incremental valve, thereby controlling the flow from the recovery chamber to the accumulator and adjusting the damping force of the shock absorber assembly. This not only improves the vehicle's driving mode but also provides higher control precision, is not affected by oil resistance, reduces hysteresis, improves response speed, and reduces wiring difficulty.

[0028] The vehicle provided by this invention includes a shock absorber assembly for adjusting the vehicle's driving comfort. It not only improves the vehicle's driving mode, but also features higher precision control via a digital incremental valve, which is not affected by oil resistance, reduces hysteresis, and improves response speed.

[0029] The vehicle damping control method provided by this invention determines the vehicle's state and calculates the required damping force by collecting the driver's operating actions and signals from position sensors. This is used to adjust the vehicle's driving comfort, reduce lag, and improve response speed. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the vibration damper assembly in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the digital incremental valve in an embodiment of the present invention.

[0033] Figure label:

[0034] 1. Shock absorber body; 2. First external pipeline; 3. Digital incremental valve; 4. Accumulator; 5. Reset compensation valve; 51. First check valve; 52. First fixed damper; 6. Compression compensation valve; 7. Second external pipeline; 8. Compression valve; 81. Second check valve; 82. Second fixed damper; 9. Reset valve;

[0035] 11. Working cylinder; 12. Piston; 13. Restoration chamber; 14. Compression chamber; 15. Piston rod;

[0036] 31. Valve body; 32. Spool valve; 33. Ball screw; 34. Stepper motor; 35. Oil inlet; 36. Oil outlet; 37. Position sensor; 38. Oil passage. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0041] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0044] In the actual control process of hydraulic shock absorbers, due to the very short recovery and compression process time, the armature inside the solenoid valve and the oil resistance, the valve core of the solenoid valve cannot quickly reach the response position, which ultimately leads to the inaccurate control of the damping force.

[0045] To accelerate response speed, avoid the influence of oil resistance, and improve the control accuracy of damping force, this embodiment provides a shock absorber assembly, a vehicle, and a vehicle damping control method, which are described below in conjunction with... Figures 1 to 2 The specific content of this embodiment will be described in detail.

[0046] like Figure 1As shown, the shock absorber assembly includes a shock absorber body 1, a first external pipeline 2, a digital incremental valve 3, an accumulator 4, a compression compensation valve 6, and a recovery compensation valve 5. The shock absorber body 1 includes a working cylinder 11 with an internal sliding chamber and a piston 12 slidably disposed within the sliding chamber, dividing the sliding chamber into a recovery chamber 13 and a compression chamber 14. The two ends of the first external pipeline 2 are connected to the recovery chamber 13 and the compression chamber 14, respectively. The digital incremental valve 3 is disposed on the first external pipeline 2. The accumulator 4 is connected to the first external pipeline 2 and is located on the side of the digital incremental valve 3 away from the recovery chamber 13. The compression compensation valve 6 is disposed on the piston 12 and is used to connect the recovery chamber 13 and the compression chamber 14 during compression. The recovery compensation valve 5 is installed on the first external pipeline 2, and the recovery compensation valve 5 is located on the side of the accumulator 4 near the compression chamber 14, and is used to connect the compression chamber 14 and the accumulator 4 during recovery.

[0047] In short, the shock absorber assembly provided by this invention connects the shock absorber body, digital incremental valve 3, accumulator 4, and recovery compensation valve 5 in series via a first external pipeline 2. A compression compensation valve 6 is installed on the piston 12 of the shock absorber body 1. During compression, the piston 12 moves downward, causing the hydraulic oil in the compression chamber 14 to flow through the compression compensation valve 6 to the recovery chamber 13, digital incremental valve 3, and accumulator 4. A recovery compensation valve 5 is installed on the side of the first external pipeline 2 near the compression chamber 14 of the shock absorber body 1. During recovery, the piston 12 moves upward, increasing the volume of the compression chamber 14 and decreasing the internal pressure. The oil flows from the recovery chamber 13 into the digital incremental valve 3 and then through the accumulator 4. The hydraulic oil in the accumulator 4... Hydraulic oil flows through the recovery compensation valve 5 to the compression chamber 14 for rapid filling. During one cycle of compression and recovery by the piston 12, hydraulic oil flows from the compression chamber 14 to the recovery chamber 13, and then returns to the compression chamber 14 via the accumulator 4, achieving hydraulic oil recycling. A digital incremental valve 3 replaces the traditional solenoid valve. The controller sends pulses to control the opening of the digital incremental valve 3, thereby controlling the flow from the recovery chamber 13 to the accumulator 4, and thus adjusting the damping force of the shock absorber assembly. This not only improves the vehicle's driving mode but also provides higher control precision, is unaffected by oil resistance, reduces hysteresis, improves response speed, and simplifies wiring. The shock absorber assembly provided by this invention uses fewer components, has high reliability, and eliminates the noise generated by the high-frequency switching of the electromagnetic proportional valve.

[0048] Furthermore, the shock absorber assembly also includes a second external pipeline 7 and a compression valve 8 disposed on the second external pipeline 7. The second external pipeline 7 is connected in parallel to both ends of the recovery compensation valve 5, and the opening stiffness of the compression valve 8 is greater than that of the compression compensation valve 6. When under aggressive driving conditions, when the piston 12 is in a rapid compression state, both the compression valve 8 and the compression compensation valve 6 are opened. A portion of the hydraulic oil in the compression chamber 14 flows to the recovery chamber 13 through the compression compensation valve 6, and another portion of the hydraulic oil flows to the accumulator 4 through the compression valve 8, achieving a safe pressure relief function and ensuring the normal use of the shock absorber body 1. In this embodiment, the various parts are mechanically rigidly connected through holes and metal pipelines.

[0049] Furthermore, the shock absorber assembly also includes a recovery valve 9, which is located on the piston 12 and connects the recovery chamber 13 and the compression chamber 14 during recovery. The opening stiffness of the recovery valve 9 is greater than that of the recovery compensation valve 5. When the piston 12 is in a rapid recovery state under aggressive driving conditions, both the recovery valve 9 and the recovery compensation valve 5 are opened. Not only does the hydraulic oil in the accumulator 4 flow to the compression chamber 14 through the recovery compensation valve 5, but the hydraulic oil in the recovery chamber 13 is also quickly replenished to the compression chamber 14 through the recovery valve 9, preventing excessive vacuum in the compression chamber 14 and ensuring the normal operation of the shock absorber body 1.

[0050] Furthermore, the digital incremental valve 3 includes a valve body 31 and a spool valve 32, a ball screw 33, and a stepper motor 34 coaxially disposed within the valve body 31. The oil inlet 35 of the valve body 31 is connected to the recovery chamber 13 via a first external pipeline 2, and the oil outlet 36 of the valve body 31 is connected to the accumulator 4 via the first external pipeline 2. When the piston 12 is compressed, the hydraulic oil in the recovery chamber 13 flows from the oil inlet 35 of the valve body 31 into the digital incremental valve 3, and flows from the oil outlet 36 of the digital incremental valve 3 to the accumulator 4.

[0051] Understandably, the stepper motor 34 is itself a digital component, which facilitates connection to a computer interface, simplifies the valve structure, and reduces costs. The stepper motor 34 has no cumulative error and good repeatability. Theoretically, any level of positioning accuracy can be achieved when using a microstepping drive circuit. The stepper motor 34 has almost no hysteresis error, therefore the overall hysteresis error of the valve is very small. The control signal of the stepper motor 34 is a pulse logic signal, therefore the overall reliability and anti-interference capability of the valve are better than those of corresponding proportional valves and servo valves. The digital incremental valve 3 has no special requirements for the valve body 31 and can use the valve body of an existing proportional valve or conventional valve.

[0052] Furthermore, the digital incremental valve 3 also includes a position sensor 37, which is disposed within the valve body 31 and is used to detect the distance the slide valve 32 has moved. Specifically, since one end of the ball screw 33 is connected to the slide valve 32, the transmitting end of the position sensor 37 can be directed towards either the ball screw 33 or the slide valve 32, without further restrictions.

[0053] Furthermore, the recovery compensation valve 5 includes a first check valve 51 and a first fixed damper 52. The outlet of the first check valve 51 is connected to the compression chamber 14, and the inlet of the first check valve 51 is connected to the accumulator 4. The recovery valve 9 is a third check valve, with its inlet facing the recovery chamber 13 and its outlet facing the compression chamber 14. The spring stiffness of the third check valve is less than that of the first check valve 51. Under normal driving conditions, when the piston 12 is in the recovery phase, the hydraulic oil in the accumulator 4 passes through the first fixed damper 52 and opens the valve core of the first check valve 51, allowing the hydraulic oil to flow back to the compression chamber 14.

[0054] Furthermore, the compression valve 8 includes a second check valve 81 and a second fixed damper 82. The inlet end of the second check valve 81 is connected to the compression chamber 14, and the outlet end of the second check valve 81 is connected to the accumulator 4. The compression compensation valve 6 is a fourth check valve, with its inlet end facing the compression chamber 14 and its outlet end facing the recovery chamber 13. The spring stiffness of the fourth check valve is less than that of the second check valve 81. Under aggressive driving conditions, some of the hydraulic oil in the compression chamber 14 flows to the accumulator 4 through the second check valve 81 and the second fixed damper 82.

[0055] This embodiment also provides a vehicle including the aforementioned shock absorber assembly. Specifically, a shock absorber assembly is provided between the vehicle chassis and each wheel. By adding a shock absorber assembly between the chassis and each wheel, the damping force of the shock absorber assembly is adjusted by the opening of the digital incremental valve 3 of the shock absorber assembly. The incremental valve is multi-stage adjustable, approximately stepless.

[0056] This embodiment also provides a vehicle shock absorption control method for adjusting the damping force of the aforementioned shock absorber assembly. The vehicle shock absorption control method includes the following steps:

[0057] Collect driver's operating actions and signals from position sensor 37;

[0058] The vehicle's status is determined based on the collected signals, and the required damping force for the vehicle is calculated.

[0059] Start the stepper motor 34 to move the slide valve 32 to the set position.

[0060] Understandably, the basic principle of the vehicle damping control method is as follows: the controller collects the driver's operations in real time via the CAN bus, and simultaneously collects signals from various position sensors 37. The controller determines the vehicle's state based on the collected signals, calculates the required damping force in real time, and calculates the appropriate position of the stepper motor 34 or ball screw 33 based on the damping force, thereby controlling the vehicle's vibration.

[0061] For example, when the driver brakes suddenly, in order to suppress the pitching motion of the vehicle body, the stepper motor 34 of the front and rear shock absorbers is activated simultaneously. The ball screw 33 reduces the orifice diameter of the slide valve 32, increases the damping force of the shock absorber, and reduces the pitch.

[0062] When the driver is driving on a rough road surface, in order to suppress the vibration of the vehicle body, the four front and rear shock absorbers will adjust the position of the stepper motor 34 (the opening of the slide valve 32) in real time according to the vibration of the vehicle body and the road surface, and adjust the damping force as needed to achieve the best vehicle body vibration, suspension displacement and road surface contact.

[0063] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A shock absorber assembly, characterized in that, include: The shock absorber body (1) includes a working cylinder (11) with a sliding chamber inside and a piston (12) slidably disposed in the sliding chamber. The piston (12) divides the sliding chamber into a recovery chamber (13) and a compression chamber (14). The first external conduit (2) is connected at both ends to the restoration chamber (13) and the compression chamber (14), respectively; A digital incremental valve (3) is installed on the first external pipeline (2); The accumulator (4) is connected to the first external pipeline (2) and is located on the side of the digital incremental valve (3) away from the recovery chamber (13); A compression compensation valve (6) is disposed on the piston (12) and is used to connect the recovery chamber (13) and the compression chamber (14) during compression. The recovery compensation valve (5) is installed on the first external pipeline (2) and located on the side of the accumulator (4) near the compression chamber (14) for connecting the compression chamber (14) and the accumulator (4) during recovery; The first external pipeline (2) connects the shock absorber body (1), the digital incremental valve (3), the accumulator (4) and the recovery compensation valve (5) in series.

2. The shock absorber assembly according to claim 1, characterized in that, It also includes a second external pipeline (7) and a compression valve (8) disposed on the second external pipeline (7). The second external pipeline (7) is disposed in parallel at both ends of the recovery compensation valve (5), and the opening stiffness of the compression valve (8) is greater than the opening stiffness of the compression compensation valve (6).

3. The shock absorber assembly according to claim 2, characterized in that, It also includes a recovery valve (9), which is disposed on the piston (12) and is used to connect the recovery chamber (13) and the compression chamber (14) during recovery. The opening stiffness of the recovery valve (9) is greater than that of the recovery compensation valve (5).

4. The shock absorber assembly according to claim 3, characterized in that, The digital incremental valve (3) includes a valve body (31) and a slide valve (32), a ball screw (33) and a stepper motor (34) coaxially arranged in the valve body (31). The oil inlet (35) of the valve body (31) is connected to the recovery chamber (13) through the first external pipeline (2), and the oil outlet (36) of the valve body (31) is connected to the accumulator (4) through the first external pipeline (2).

5. The shock absorber assembly according to claim 4, characterized in that, The digital incremental valve (3) also includes a position sensor (37), which is disposed inside the valve body (31) and is used to detect the distance the slide valve (32) moves.

6. The shock absorber assembly according to any one of claims 3-5, characterized in that, The recovery compensation valve (5) includes a first check valve (51), the liquid outlet of the first check valve (51) is connected to the compression chamber (14), and the liquid inlet of the first check valve (51) is connected to the accumulator (4).

7. The shock absorber assembly according to any one of claims 3-5, characterized in that, The compression valve (8) includes a second check valve (81), the inlet end of which is connected to the compression chamber (14), and the outlet end of which is connected to the accumulator (4).

8. A vehicle, characterized in that, Includes the shock absorber assembly as described in any one of claims 1-7.

9. The vehicle according to claim 8, characterized in that, The shock absorber assembly is installed between the chassis of the vehicle and each wheel.

10. A vehicle shock absorption control method, characterized in that, Adjusting the damping force of the shock absorber assembly as described in any one of claims 5-7 includes the following steps: Collect driver's operating actions and signals from position sensor (37); The vehicle's status is determined based on the collected signals, and the required damping force for the vehicle is calculated. Start the stepper motor (34) to move the slide valve (32) to the set position.

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