Suspension system, control method of suspension system and vehicle

Abstract

The invention relates to a suspension system, a control method of the suspension system and a vehicle. The suspension system comprises an energy accumulator and a pressure regulating device. The energy accumulator is used for providing system pressure required by the suspension system through the first pressure working medium; the pressure regulating device is configured to be used for outputting a second pressure working medium to the energy accumulator or enabling the energy accumulator to release the second pressure working medium; the energy accumulator comprises a variable first chamber and a variable second chamber; the first cavity contains a first pressure working medium; the second cavity communicates with the pressure regulating device so as to contain a second pressure working medium output by the pressure regulating device. The suspension system and the vehicle have the beneficial effects that the second pressure working medium can be obtained from the environment, and therefore the height of the suspension system can be conveniently adjusted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile suspension, in particular to a suspension system, a control method of the suspension system and a vehicle. BACKGROUND

[0002] The suspension system is a mechanism for connecting the wheels and the vehicle body, and mainly functions to support the stable driving of the vehicle body and to reduce the impact from the road. According to whether the suspension system can adjust the acting force, the suspension can be divided into passive suspension and active suspension.

[0003] The height adjustment and active force regulation of the current active suspension exist contradictions in implementation. SUMMARY

[0004] The embodiments of the present application provide a suspension system, a control method of the suspension system and a vehicle, which improve the adaptability of the height adjustment capability and the active force regulation capability of the suspension system, so as to at least partially solve the above technical problems.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a suspension system is provided, characterized in that it comprises:

[0006] An accumulator is configured to provide a system pressure required by the suspension system by using a first pressure medium;

[0007] A pressure regulating device is configured to output or release a second pressure medium to or from the accumulator;

[0008] The accumulator comprises a first chamber and a second chamber, the first chamber is configured to contain the first pressure medium, and the second chamber is in communication with the pressure regulating device to contain the second pressure medium output by the pressure regulating device.

[0009] Optionally, the pressure regulating device further comprises:

[0010] A pressure medium pump is configured to pump the second pressure medium.

[0011] Optionally, the pressure medium pump is configured as an air compressor.

[0012] Optionally, the pressure regulating device further comprises:

[0013] A first one-way valve is configured to allow the pump outlet of the pressure medium pump to be unidirectionally communicated with the accumulator.

[0014] Optionally, the pressure regulating device further comprises:

[0015] A drying unit is configured to dry the second pressure medium entering the accumulator.

[0016] Optionally, the pressure regulating device further comprises:

[0017] A two-stage check valve is used to ensure one-way communication between the pump outlet of the pressure regulating working fluid pump and the drying unit.

[0018] Optionally, the voltage regulating device further includes:

[0019] A throttle valve is connected in parallel with the secondary check valve and positioned between the accumulator and the drying unit.

[0020] Optionally, the voltage regulating device further includes:

[0021] A regulating control valve is used to control whether the accumulator releases the second pressure working fluid to the outside.

[0022] Optionally, the voltage regulating device further includes:

[0023] A filtration unit is used to filter the second pressurized working fluid entering the accumulator.

[0024] Optionally, the regulating control valve is connected between the drying unit and the filtering unit.

[0025] Optionally, the pressure regulating device is configured to output to the accumulator or cause the accumulator to release the second pressure working fluid according to the suspension height setting of the suspension system.

[0026] Optionally, the density of the second pressure working fluid provided by the pressure regulating device is less than the density of the first pressure working fluid.

[0027] Optionally, the suspension system further includes:

[0028] Piston rod, including a piston section;

[0029] A cylinder body for accommodating the piston section and being divided by the piston section into a third chamber and a fourth chamber;

[0030] A first one-way valve is used to establish a one-way connection between the accumulator and the third chamber;

[0031] A second one-way valve is used to establish a one-way connection between the accumulator and the fourth chamber.

[0032] Optionally, the suspension system further includes:

[0033] A first damping valve is used to form a damped connection between the accumulator and the third chamber;

[0034] A second damping valve is used to create a damped connection between the accumulator and the fourth chamber.

[0035] Optionally, the suspension system further includes:

[0036] A second pump configured as a bidirectional pump in communication with the third chamber and the fourth chamber, respectively.

[0037] According to a third aspect of the present application, a control method of a suspension system is provided, comprising:

[0038] outputting or releasing the second pressure medium to the accumulator according to a suspension height setting of the suspension system, to adjust the suspension height of the suspension system;

[0039] The accumulator is configured to provide a system pressure required by the suspension system by using the first pressure medium.

[0040] Optionally, the outputting or releasing the second pressure medium to the accumulator according to a suspension height setting of the suspension system, to adjust the suspension height of the suspension system, comprises:

[0041] releasing the second pressure medium from the accumulator when lowering the suspension height of the suspension system; or,

[0042] outputting the second pressure medium to the accumulator when raising the suspension height of the suspension system.

[0043] Optionally, the releasing the second pressure medium from the accumulator when lowering the suspension height of the suspension system, comprises:

[0044] controlling the pressure control valve to switch to a first state, so that the second chamber of the accumulator for containing the second pressure medium releases the second pressure medium through the pressure control valve.

[0045] Optionally, the outputting the second pressure medium to the accumulator when raising the suspension height of the suspension system, comprises:

[0046] controlling the pressure control valve to switch to a second state, so that the pressure medium pump is in communication with the second chamber of the accumulator for containing the second pressure medium through the pressure control valve, and the pressure medium pump outputs the second pressure medium to the second chamber through the pressure control valve.

[0047] Optionally, when the suspension height of the suspension system is at a design height, the state parameter of the suspension system satisfies:

[0048] P0(A2-A1)η+kx0=mg

[0049] P0(A2-A1)η=kx0, wherein P0 is a system pressure of the suspension system when the suspension is at a design height, A1 is a cross-sectional area of a first chamber of the accumulator for containing the first pressure medium, A2 is a cross-sectional area of a second chamber of the accumulator for containing the second pressure medium, k is a suspension wheel center stiffness, η is a lever ratio, x0 is an equivalent compression amount of a spring, m is a single wheel vehicle weight, and g is a gravitational acceleration.

[0050] Optionally, when lowering the height of the suspension of the suspension system, a state parameter of the suspension system satisfies:

[0051] (P0-P1)(A2-A1)η=kx1

[0052] wherein x1 is a lowering target height, and P1 is a system pressure of the suspension system at the lowering target height x1.

[0053] Optionally, when raising the height of the suspension of the suspension system, a design state parameter of the suspension system satisfies:

[0054] (P2-P0)(A2-A1)η=kx2

[0055] wherein x2 is a raising target height, and P2 is a system pressure of the suspension system at the raising target height x2.

[0056] According to a third aspect of the present application, there is also provided a vehicle comprising the suspension system or implementing the control method as described above.

[0057] The present application has the beneficial effect of providing a suspension system and vehicle capable of obtaining the second pressure medium from the environment to conveniently adjust the height of the suspension system and the like.

[0058] More specifically, some embodiments of the present application can have the following specific beneficial effects:

[0059] By configuring the pressure regulating device cooperating with the accumulator, and outputting the second pressure medium to the accumulator by the pressure regulating device, the height of the suspension system can be adjusted relatively independently with respect to the active power adjustment function, so that the active power adjustment and the vehicle body height adjustment can be adapted to each other, and the change of one of the two unconventional changes causes the change of the other, so that the suspension system is adapted to more complex road conditions for use to improve the passability, maneuverability and comfort of the vehicle. And the use of the second pressure medium is relatively independent of the first pressure medium, so the dependence on the original first pressure medium of the suspension system is smaller.

[0060] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0062] For a more complete understanding of the present application and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings in which like reference numerals represent like parts of the present application.

[0063] Figure 1 is the overall structure schematic diagram of the suspension system provided in the exemplary embodiments of the present application;

[0064] Figure 2 is the main flow chart of the suspension system control method provided in the exemplary embodiments of the present application;

[0065] Figure 3 is the partial flow chart of the suspension system control method provided in the exemplary embodiments of the present application;

[0066] Figure 4 is the height adjustment principle diagram of the suspension system provided in the exemplary embodiments of the present application;

[0067] Figure 5 is the damping force adjustment and active force adjustment principle diagram of the suspension system provided in the exemplary embodiments of the present application;

[0068] Figure 6 is the usage state reference diagram of the adjustment control valve in the suspension system provided in the exemplary embodiments of the present application;

[0069] Figure 7 is the overall structure schematic diagram of the vehicle provided in the exemplary embodiments of the present application.

[0070] Explanation of reference numerals:

[0071] 1, piston rod; 2, third chamber; 3, piston part; 4, fourth chamber; 5, second pump; 6, bidirectional motor; 7, first check valve; 8, first damping valve; 9, second check valve; 10, second damping valve; 11, accumulator; 11a, first chamber; 11b, second chamber; 12, two-stage check valve; 13, throttle valve; 14, drying unit; 15, primary check valve; 16, adjustment control valve; 17, pressure regulating working medium pump; 18, filtering unit; 100, vehicle. DETAILED DESCRIPTION

[0072] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0073] According to a first aspect of the present application, with reference to Figure 1 The present application provides a suspension system, comprising an accumulator 11 and a pressure regulating device.

[0074] The accumulator 11 is configured to provide system pressure required by the suspension system by using a first pressure medium; the pressure regulating device is configured to output or release a second pressure medium to or from the accumulator 11; the accumulator 11 comprises a first chamber 11a and a second chamber 11b; the first chamber 11a is configured to contain the first pressure medium; the second chamber 11b is in communication with the pressure regulating device to contain the second pressure medium output by the pressure regulating device. By configuring the pressure regulating device in cooperation with the accumulator 11, and outputting the second pressure medium to the accumulator 11 by using the pressure regulating device, the height of the suspension system can be adjusted relatively independently with respect to the active power adjustment function, so that the active power adjustment and the vehicle body height adjustment can be adapted to each other, and the change of the conventional one will change the other, so that the suspension system is adapted to more complex road conditions for use to improve the passability, maneuverability and comfort of the vehicle.

[0075] In addition, the use of the second pressure medium is relatively independent of the first pressure medium, that is, the first pressure medium and the second pressure medium can be obtained from different sources, for example, the second pressure medium can be obtained from a source integrated with the suspension system, such as a vehicle, and the first pressure medium can be obtained from an external environment, so that the dependence of the first pressure medium on the original suspension system for achieving the buffering and damping function is smaller.

[0076] It should be noted that the first pressure medium can be a medium used by the suspension system to provide a buffering effect for a device such as a vehicle on which the suspension system is mounted, for example, hydraulic oil, compressed air, for example, when the first pressure medium is hydraulic oil, the source of the first pressure medium can be a hydraulic oil tank configured to store hydraulic oil on a device such as a vehicle integrated with the suspension system. Correspondingly, the second pressure medium can be a medium used in the accumulator 11 to provide a buffering and damping effect, for example, hydraulic oil, air, etc., for example, when the second pressure medium is air, the source of the second pressure medium can be an external environment in which a device such as a vehicle integrated with the suspension system is located.

[0077] In some embodiments, the pressure regulating device is configured to output or release the second pressure medium from the accumulator 11 according to the suspension height of the suspension system. That is, when the suspension height of the suspension system needs to be adjusted, the flow of the first pressure medium is controlled by the input or output of the second pressure medium in the accumulator 11, so that the suspension height is flexibly adjusted by the cooperation of the first pressure medium and the second pressure medium.

[0078] In some embodiments, the pressure regulating device provides the second pressure medium with a density less than that of the first pressure medium.

[0079] In specific embodiments, the first pressure medium is, for example, hydraulic oil. The second pressure medium can be obtained from the environment, for example, air. By defining that the densities of the first pressure medium and the second pressure medium are different, that is, substantially defining that the first pressure medium and the second pressure medium are two different substances, the pressure, amount, and other parameters of the first pressure medium and the second pressure medium can be independently adjusted, and the first pressure medium is directly used to provide the pressure of the suspension system, while the second pressure medium is used to adjust the pressure and other parameters of the second pressure medium. The density difference between the two kinds of media makes the weight of the second pressure medium used to directly provide the system pressure relatively greater than the weight of the first pressure medium used to indirectly adjust the system pressure, and the mass ratio of the two kinds of media in the system is reasonable, which is beneficial to control the overall weight of the suspension system.

[0080] In some embodiments, the pressure regulating device further comprises a pressure regulating medium pump 17. The pressure regulating medium pump 17 is used to pump the second pressure medium, so as to pump the second pressure medium from the pressure regulating device to the accumulator 11. In specific embodiments, the pressure regulating medium pump 17 can be, for example, an air compressor, which can be used to pump air into the accumulator 11 when the second pressure medium is air.

[0081] In some embodiments, the pressure regulating device further comprises a primary one-way valve 15. The primary one-way valve 15 is used to unidirectionally connect the pump outlet of the pressure regulating medium pump 17 and the accumulator 11, so as to avoid the second pressure medium in the accumulator 11 from flowing back to the pressure regulating medium pump 17 and damaging the pressure regulating medium pump 17, or avoiding the height of the suspension system from changing due to excessive loss of the second pressure medium in the accumulator 11, and ensuring the stable operation of the suspension system.

[0082] In some embodiments, the pressure regulating device further comprises a drying unit 14. The drying unit 14 is used to dry the second pressure medium entering the accumulator 11. By drying the second pressure medium, the possibility of rust inside the accumulator 11 is reduced.

[0083] In some embodiments, the pressure regulating device further comprises a secondary check valve 12. The secondary check valve 12 is configured to allow a one-way flow from the pump outlet of the pressure regulating working medium pump 17 to the drying unit 14. The secondary check valve 12 is configured to prevent the second pressure working medium in the accumulator 11 from flowing to the drying unit 14 and damaging the drying unit 14, or to prevent the height of the suspension system from changing due to excessive loss of the second pressure working medium in the accumulator 11, thereby ensuring stable operation of the suspension system.

[0084] In some embodiments, the pressure regulating device further comprises a throttle valve 13. The throttle valve 13 is connected in parallel with the secondary check valve 12 and arranged between the accumulator 11 and the drying unit 14. The throttle valve 13 is configured to control the flow rate of the second pressure working medium in the accumulator 11 after the second pressure working medium is discharged from the throttle valve 13, thereby relatively smoothly adjusting the height of the suspension system.

[0085] In a specific embodiment, the throttle valve 13 can be used as a damping valve and arranged between the accumulator 11 and the drying unit 14. The throttle valve 13 is configured to prolong the discharge time, thereby more easily removing the moisture absorbed in the drying unit 14.

[0086] In some embodiments, the pressure regulating device further comprises an adjusting control valve 16. The adjusting control valve 16 is configured to control whether the second pressure working medium in the accumulator 11 is released to the outside, i.e., to control the on-off of the flow of the second pressure working medium in the accumulator 11.

[0087] In some embodiments, the pressure regulating device further comprises a filtering unit 18. The filtering unit 18 is configured to filter the second pressure working medium entering the accumulator 11. The filtering unit 18 is configured to ensure that the second pressure working medium is relatively pure, thereby preventing too many impurities from entering the accumulator 11 or the pressure regulating working medium pump 17 and damaging the equipment.

[0088] In some embodiments, the adjusting control valve 16 is connected between the drying unit 14 and the filtering unit 18. The adjusting control valve 16 is configured to allow the second pressure working medium in the accumulator 11 to flow from the drying unit 14 to the filtering unit 18 and finally be discharged, thereby achieving backwashing of the drying unit 14 and the filtering unit 18.

[0089] In some embodiments, the suspension system further comprises: a piston rod 1, a cylinder, a first one-way valve 7 and a second one-way valve 9. Wherein, the piston rod 1 comprises a piston part 3; the cylinder is used for containing the piston part 3 and is divided into a third chamber 2 and a fourth chamber 4 by the piston part 3; the first one-way valve 7 is used for establishing one-way communication between the accumulator 11 and the third chamber 2, i.e. the first pressure working medium between the accumulator 11 and the third chamber 2 is only allowed to flow from the accumulator 11 to the third chamber 2 at the first one-way valve 7; the second one-way valve 9 is used for establishing one-way communication between the accumulator 11 and the fourth chamber 4, i.e. the first pressure working medium between the accumulator 11 and the fourth chamber 4 is only allowed to flow from the accumulator 11 to the fourth chamber 4 at the second one-way valve 9.

[0090] The piston rod 1 is used for being connected to a corresponding part of the vehicle, such as a vehicle body, a wheel, etc., and provides a buffer for the vehicle through hydraulic pressure when the vehicle is running, so as to realize shock absorption of external impact. In some specific embodiments, the piston rod 1 can be connected to a wheel shaft, so that when the wheel jumps, the piston rod 1 can move relative to the cylinder along with the wheel, for example, when the wheel jumps down, the oil in the third chamber 2 is extruded. When the wheel jumps up, the oil in the fourth chamber 4 is extruded.

[0091] In some embodiments, the suspension system further comprises: a first damping valve 8 and a second damping valve 10. Wherein, the first damping valve 8 is used for establishing damping communication between the accumulator 11 and the third chamber 2; the second damping valve 10 is used for establishing damping communication between the accumulator 11 and the fourth chamber 4. By using the first damping valve 8 and the second damping valve 10, the rigidity of the suspension system can be adjusted, i.e. the degree of buffer stroke when the piston rod 1 responds to external force impact.

[0092] In some embodiments, the suspension system further comprises: a second pump 5. Wherein, the second pump 5 is configured as a bidirectional pump which communicates with the third chamber 2 and the fourth chamber 4 respectively. In a specific scheme, the second pump 5 is further connected with a bidirectional motor 6, and is driven to work by the bidirectional motor 6, so as to supply oil to the third chamber 2 or the fourth chamber 4, and realize active force adjustment of the suspension system.

[0093] According to a second aspect of the present application, a control method of a suspension system is provided. In specific embodiments, the control method of the suspension system provided by the present application can be applied to control the aforementioned suspension system to adjust the height of the suspension of the aforementioned suspension system.

[0094] Referring to Figure 2 and Figure 3 , the control method of the suspension system provided by the present application comprises:

[0095] S100, outputting or releasing the second pressure working medium to the accumulator according to the suspension height setting of the suspension system; wherein the accumulator is configured to provide the system pressure required by the suspension system through the first pressure working medium.

[0096] Specifically, S100 includes:

[0097] S110, releasing the second pressure working medium from the accumulator when lowering the height of the suspension of the suspension system; or outputting the second pressure working medium to the accumulator when raising the height of the suspension of the suspension system.

[0098] When lowering the height of the suspension of the suspension system, the pressure regulating control valve is controlled to switch to the first state, so that the second chamber of the accumulator for containing the second pressure working medium releases the second pressure working medium through the pressure regulating control valve.

[0099] When raising the height of the suspension of the suspension system, the pressure regulating control valve is controlled to switch to the second state, so that the pressure regulating working medium pump is connected to the second chamber of the accumulator for containing the second pressure working medium through the pressure regulating control valve, and the pressure regulating working medium pump outputs the second pressure working medium to the second chamber through the pressure regulating control valve.

[0100] The suspension system and the control method of the suspension system adapted to the suspension system of the present application will be specifically described below with reference to the accompanying drawings, so as to specifically illustrate the inventive concept of the present application. In the following specific embodiments, the suspension system is integrated on a vehicle, and the suspension of the suspension system is arranged between the wheels and the vehicle body to provide a cushioning effect, and the control method of the suspension system is used to adjust the height of the suspension and thus adjust the relative position between the wheels and the vehicle body.

[0101] The present application adjusts the height of the full-active hydraulic suspension system by adjusting the pressure of the gas supply system of the accumulator, and the system can still be adjusted in damping and active force after being adjusted to the target height. The system solves the industry pain point problem that the existing active suspension system cannot maintain the height for a long time, so that the active suspension system can be adjusted and maintained at any height, and the passability, maneuverability and comfort of the vehicle are further improved.

[0102] Referring to Figure 4 The present application can adjust the active force and / or the height of the vehicle body through various configurations, thereby forming various adjustment modes.

[0103] The height adjustment according to the present application is described as follows:

[0104] The suspension controller (for example, the suspension controller can be a vehicle-mounted controller when the suspension system is integrated on a vehicle, i.e., the suspension controller can be specifically configured as a vehicle-mounted ECU) analyzes the collected signals to determine the target height position that the system should execute.

[0105] When the suspension controller judges that the suspension is in the design height state, the adjusting control valve 16 is switched to the Figure 6 The position shown corresponds to the adjusting control valve 16 being in the first state, at which time the pressure regulating working medium pump 17 is disconnected from the accumulator 11. The piston part 3 is maintained in the design position by the initial pressure of the accumulator, the initial compression amount of the spring, and the spring load reaching equilibrium. At this time, the state parameters of the suspension system satisfy:

[0106] P0(A2-A1)η+kx0=mg

[0107] Where P0 is the system pressure of the suspension system when the suspension is in the design height state, A1 is the cross-sectional area of the third chamber 2 of the cylinder body for containing the first pressure working medium, A2 is the cross-sectional area of the fourth chamber 4 of the cylinder body for containing the first pressure working medium, k is the suspension wheel center stiffness, η is the lever ratio, x0 is the design state spring equivalent compression amount, m is the single wheel vehicle weight (i.e. the weight of the vehicle borne by a single wheel of the vehicle equipped with the suspension, for reference, for example, when the vehicle is a four-wheel vehicle, the single wheel vehicle weight is generally 1 / 4 of the total weight of the vehicle), and g is the acceleration of gravity.

[0108] It should be noted that the system pressure of the suspension system mentioned in the present application can specifically refer to the pressure of the first pressure working medium for providing a buffering effect in the suspension system. In specific embodiments, for example, when the first pressure working medium is hydraulic oil, the system pressure of the suspension system can refer to the hydraulic pressure of the first pressure working medium in the cylinder body.

[0109] The spring mentioned in the present application is specifically a spring configured between the wheel and the vehicle body of the suspension for providing a buffering and damping effect.

[0110] It is generally considered that the inner wall of the cylinder body forming the third chamber 2 and the fourth chamber 4 is generally cylindrical. At this time, the cross-sectional area of the third chamber 2 is configured as the area surrounded by the projection of the inner wall of the third chamber 2 on the projection plane with the central axis of the cylinder as the normal line, and the cross-sectional area of the fourth chamber 4 is configured as the area surrounded by the projection of the inner wall of the fourth chamber 4 on the projection plane with the central axis of the cylinder as the normal line.

[0111] As another solution, a fitting such as the piston part 3 is often slidably arranged between the third chamber 2 and the fourth chamber 4, so that the volumes of the third chamber 2 and the fourth chamber 4 are variable. At this time, the cross-sectional area of the third chamber 2 can be configured as the area surrounded by the projection of the inner wall of the third chamber 2 on the projection plane with the sliding direction of the piston part 3 as the normal line, and the cross-sectional area of the fourth chamber 4 can be configured as the area surrounded by the projection of the inner wall of the second chamber on the projection plane with the sliding direction of the piston part 3 as the normal line.

[0112] When the suspension controller determines that the suspension needs to be lowered, the regulating control valve 16 is switched to the position shown in Figure 5 , and the gas in the accumulator 11 flows through the throttle valve 13, the drying unit 14, the regulating control valve 16, and the filter unit 18 to be discharged into the atmosphere. After the gas is exhausted, the regulating control valve 16 is switched to the position shown in Figure 6 , the pressure regulating working medium pump 17 is started, and the air flows through the filter unit 18, the primary one-way valve 15, the drying unit 14, the secondary one-way valve 12, and the accumulator 11, and the system pressure is adjusted to P1, and then the pressure regulating working medium pump 17 is turned off (the control strategy can also be replaced by turning off the pressure regulating working medium pump 17 when the suspension height signal is detected to be lowered to the target height x1). The system parameters satisfy:

[0113] (P0-P1)(A2-A1)η=kx1

[0114] , wherein P1 is the system pressure of the suspension corresponding to the target height x1.

[0115] When the suspension controller determines that the suspension needs to be raised, the regulating control valve 16 is switched to the position shown in Figure 6 , the pressure regulating working medium pump 17 is started, and the air flows through the filter unit 18, the primary one-way valve 15, the drying unit 14, the secondary one-way valve 12, and the accumulator 11, and the system pressure is adjusted to P2, and then the pressure regulating working medium pump 17 is turned off (the control strategy can also be replaced by turning off the pressure regulating working medium pump 17 when the suspension height signal is detected to be raised to the target height x2). The system parameters satisfy:

[0116] (P2-P0)(A2-A1)η=kx2

[0117] , wherein P2 is the system pressure of the suspension corresponding to the target height x2.

[0118] As shown in Figure 4 , the active force regulation mode according to the embodiment of the present application is described as follows:

[0119] The suspension controller determines that the system should be in the active force regulation mode by analyzing the collected signals.

[0120] When the suspension controller determines that the tire needs to be lifted, the bidirectional motor 6 drives the second pump 5 to pump hydraulic oil, part of the hydraulic oil pushes the piston part 3 to move downward, the hydraulic oil in the fourth chamber 4 is extruded and flows back to the second pump 5, and the other part of the hydraulic oil flows through the first damping valve 8 and enters the accumulator 11 until the system pressure is balanced.

[0121] It should be noted that the description of the "up" and "down" directions mentioned in the present application is for the purpose of explaining the inventive concept of the present application, and is relative to the up and down directions of the corresponding drawings, and is not a limitation on the specific relative position relationship between the parts.

[0122] When the suspension controller determines that the tire needs to be pressed down, the bidirectional motor 6 drives the second pump 5 to pump hydraulic oil, part of the hydraulic oil pushes the piston part 3 to move upwards, and the liquid in the third chamber 2 is extruded and flows back into the second pump 5; another part of the hydraulic oil flows through the second damping valve 10 and the oil of the accumulator 11 flows through the first one-way valve 7, and is supplemented into the second pump 5 until the system pressure balance is reached.

[0123] Referring to Figures 4 to 6 , the damping adjustment mode implemented according to the present application is described as follows:

[0124] The suspension controller determines that the system should be in the damping adjustment mode by analyzing the collected signals.

[0125] In the damping adjustment mode, the second pump 5 is in a disconnected state, that is, the second pump 5 does not pump hydraulic oil into the cylinder.

[0126] When the wheel jumps up, the hydraulic oil in the fourth chamber 4 is extruded and flows through the second damping valve 10, part of the hydraulic oil enters the accumulator 11, and another part of the hydraulic oil flows through the first one-way valve 7 and enters the third chamber 2. By changing the size of the input current to adjust the opening of the second damping valve 10, the compression damping force can be adjusted.

[0127] When the wheel drops down, the hydraulic oil in the third chamber 2 is extruded and flows through the first damping valve 8, and under the pressure of the accumulator 11, the hydraulic oil flows through the second one-way valve 9 and enters the fourth chamber 4. By changing the size of the input current to adjust the opening of the first damping valve 8, the recovery damping force can be adjusted.

[0128] It should be noted that for the suspension controller determining that the tire needs to be pressed up, the vehicle body needs to be lowered, etc. mentioned in the foregoing, the present application does not involve improvement of the specific implementation mode, and therefore is not mentioned in the text, which is not limited and elaborated here.

[0129] According to a third aspect of the present application, referring to Figure 7 , the present application also provides a vehicle 100, which comprises the above-mentioned suspension system or is used to implement the above-mentioned control method, and has all the beneficial effects of the above-mentioned suspension system or control method, which will not be elaborated here.

[0130] The vehicle 100 can be a fuel automobile, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., which is not specifically limited by the present application.

[0131] In the description of the application, the terms "first", "second", "third" and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0132] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0133] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0134] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment in accordance with the technical essence of the present application without departing from the technical solution content of the present application still falls within the scope of the technical solution of the present application.

Claims

1. A suspension system, characterized in that, include: An accumulator is used to provide the system pressure required by the suspension system through a first pressure working fluid; A pressure regulating device is used to output to the accumulator or to cause the accumulator to release a second pressure working fluid; The energy storage device includes a variable first chamber and a second chamber; the first chamber contains the first pressure working fluid; the second chamber is connected to the pressure regulating device to contain the second pressure working fluid output by the pressure regulating device.

2. The suspension system according to claim 1, characterized in that, The voltage regulating device further includes: A pressure regulating working fluid pump is used to pump the second pressure working fluid.

3. The suspension system according to claim 2, characterized in that, The pressure regulating working fluid pump is configured as an air compressor.

4. The suspension system according to claim 2, characterized in that, The voltage regulating device further includes: A first-stage check valve is used to ensure one-way communication between the pump outlet of the pressure regulating working fluid pump and the accumulator.

5. The suspension system according to claim 2, characterized in that, The voltage regulating device further includes: A drying unit is used to dry the second pressurized working fluid entering the accumulator.

6. The suspension system according to claim 5, characterized in that, The voltage regulating device further includes: A two-stage check valve is used to ensure one-way communication between the pump outlet of the pressure regulating working fluid pump and the drying unit.

7. The suspension system according to claim 6, characterized in that, The voltage regulating device further includes: A throttle valve is connected in parallel with the secondary check valve and positioned between the accumulator and the drying unit.

8. The suspension system according to claim 5, characterized in that, The voltage regulating device further includes: A regulating control valve is used to control whether the accumulator releases the second pressure working fluid to the outside.

9. The suspension system according to claim 8, characterized in that, The voltage regulating device further includes: A filtration unit is used to filter the second pressurized working fluid entering the accumulator.

10. The suspension system according to claim 9, characterized in that, The regulating control valve is connected between the drying unit and the filtration unit.

11. The suspension system according to claim 1, characterized in that, The pressure regulating device is configured to output to the accumulator or cause the accumulator to release the second pressure working fluid according to the suspension height setting of the suspension system.

12. The suspension system according to claim 1, characterized in that, The density of the second pressure working fluid provided by the pressure regulating device is less than the density of the first pressure working fluid.

13. The suspension system according to any one of claims 1 to 12, characterized in that, The suspension system also includes: Piston rod, including a piston section; A cylinder body for accommodating the piston section and being divided by the piston section into a third chamber and a fourth chamber; A first one-way valve is used to establish a one-way connection between the accumulator and the third chamber; A second one-way valve is used to establish a one-way connection between the accumulator and the fourth chamber.

14. The suspension system according to claim 13, characterized in that, Also includes: A first damping valve is used to form a damped connection between the accumulator and the third chamber; A second damping valve is used to create a damped connection between the accumulator and the fourth chamber.

15. The suspension system according to claim 14, characterized in that, The suspension system also includes: The second pump is configured as a bidirectional pump that is connected to the third chamber and the fourth chamber respectively.

16. A control method for a suspension system, characterized in that, The control method includes: According to the suspension height setting of the suspension system, a second pressure working fluid is output to or released to the accumulator to adjust the suspension height of the suspension system; The accumulator is used to provide the system pressure required by the suspension system through a first pressure working fluid.

17. The control method according to claim 16, Its features are, The step of adjusting the suspension height of the suspension system by outputting a second pressure working fluid to the accumulator or releasing the second pressure working fluid from the accumulator according to the suspension height setting of the suspension system includes: When lowering the suspension height of the suspension system, the accumulator releases the second pressure working fluid; or, When the height of the suspension system is increased, the second pressure working fluid is output to the accumulator.

18. The control method according to claim 17, characterized in that, in, The step of releasing the second pressure working fluid from the accumulator when lowering the suspension height of the suspension system includes: The pressure regulating control valve is switched to the first state, so that the second chamber of the accumulator used to contain the second pressure working medium releases the second pressure working medium through the pressure regulating control valve.

19. The control method according to claim 17, characterized in that, in, The step of outputting the second pressure working fluid to the accumulator when raising the height of the suspension system includes: The pressure regulating control valve is switched to the second state, so that the pressure regulating working fluid pump is connected to the second chamber of the accumulator for containing the second pressure working fluid through the pressure regulating control valve, and the pressure regulating working fluid pump outputs the second pressure working fluid to the second chamber through the pressure regulating control valve.

20. The control method according to claim 16, characterized in that, When the suspension of the suspension system is at the design height, the state parameters of the suspension system satisfy: P0(A2-A1)η+kx0=mg Wherein, P0 is the system pressure of the suspension system when the suspension is at the design height, A1 is the cross-sectional area of ​​the first chamber of the accumulator used to contain the first pressure working medium, A2 is the cross-sectional area of ​​the second chamber of the accumulator used to contain the second pressure working medium, k is the suspension wheel center stiffness, η is the lever ratio, x0 is the equivalent compression of the spring, m is the weight of a single wheel of the vehicle, and g is the acceleration due to gravity.

21. The control method according to claim 20, characterized in that, When the suspension height of the suspension system is lowered, the state parameters of the suspension system satisfy the following: (P0-P1)(A2-A1)η=kx1 Where x1 is the target descent height, and P1 is the system pressure of the suspension system when the target descent height x1 is reached.

22. The control method according to claim 21, characterized in that, When the height of the suspension system is increased, the design parameters of the suspension system satisfy the following: (P2-P0)(A2-A1)η=kx2 Where x2 is the target height, and P2 is the system pressure of the suspension system when the target height x2 is increased.

23. A vehicle, characterized in that, Includes the suspension system according to any one of claims 1 to 15 or the control method for implementing any one of claims 16 to 22.

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