Composite shock absorber and control method therefor, vehicle, electronic device, and medium

Abstract

A composite shock absorber and a control method therefor, a vehicle, an electronic device, and a medium. The composite shock absorber comprises: an active shock absorber main body, comprising a first outer cylinder (210), a first damping piston (220), a first piston rod (230), a hydraulic oil path, an energy accumulator (260), and an electric hydraulic pump (270), wherein the first outer cylinder (210) is provided with a first liquid chamber (240), the first damping piston (220) is arranged in the first liquid chamber (240) to divide the first liquid chamber (240) into a rebound chamber and a compression chamber and is capable of moving in the axial direction of the first outer cylinder (210), one end of the first piston rod (230) is connected to the first damping piston (220), the energy accumulator (260) and the electric hydraulic pump (270) are arranged on the hydraulic oil path, and the two ends of the hydraulic oil path are respectively communicated with the rebound chamber and the compression chamber; a magnetorheological damper main body, arranged in the compression chamber, wherein the two opposite ends of the magnetorheological damper main body are respectively connected to the first outer cylinder (210) and the first piston rod (230); and an electric control valve (300), wherein the two ends of the electric control valve are respectively communicated with the rebound chamber and the compression chamber.

Description

Composite damper, control method thereof, vehicle, electronic device and medium TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a composite damper, a control method thereof, a vehicle, an electronic device and a medium. BACKGROUND

[0002] As a component in active suspension, the active damper pumps oil into the recovery cavity or compression cavity of the outer cylinder through an electric hydraulic pump to drive the piston on the piston rod to move along the axial direction of the outer cylinder, so as to control the movement and force of the piston rod and thus control the posture and vibration of the vehicle body. The active damper can greatly improve the comfort and handling of the vehicle in low-frequency vibration conditions. However, in high-frequency conditions, the active damper is limited by the response bandwidth of the electric hydraulic pump, and the vibration control effect is worse than that of the magneto-rheological damper.

[0003] SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a composite damper, a control method thereof, a vehicle, an electronic device and a medium, which can play an excellent damping role in low-frequency, medium-frequency and high-frequency conditions, thereby improving the ride comfort and handling stability of the vehicle.

[0005] The first aspect of the present application provides a composite damper, comprising:

[0006] An active damper body, comprising a first outer cylinder, a first damping piston, a first piston rod, a hydraulic oil circuit, an accumulator and an electric hydraulic pump, the first outer cylinder is provided with a first liquid cavity, the first damping piston is arranged in the first liquid cavity and divides the first liquid cavity into a recovery cavity and a compression cavity, the first damping piston can move along the axial direction of the first outer cylinder, one end of the first piston rod is connected with the first damping piston, the accumulator and the electric hydraulic pump are arranged on the hydraulic oil circuit, and two ends of the hydraulic oil circuit are respectively communicated with the recovery cavity and the compression cavity;

[0007] A magneto-rheological damper body arranged in the compression cavity, and opposite ends of the magneto-rheological damper body are respectively connected with the first outer cylinder and the first piston rod;

[0008] An electric control valve, two ends of which are respectively communicated with the recovery cavity and the compression cavity.

[0009] The composite damper according to the embodiment of the first aspect of the present application has at least the following beneficial effects: the MR damper body is arranged in the compression cavity of the active damper body, and the opposite ends of the MR damper body are fixedly connected with the first outer cylinder and the first piston rod of the active damper body, so that the extension and contraction damping directions of the MR damper body and the active damper body are consistent, and in the process of operation of at least one of the MR damper body and the active damper body, the MR damper body and the active damper body can perform synchronous extension and contraction actions to dampen the vehicle.

[0010] Moreover, based on the above structure, the electric control valve is additionally arranged, the accumulator and the electric hydraulic pump connected in series with the hydraulic oil circuit of the active damper body are arranged in parallel, and when the vehicle is in a medium frequency or low frequency working condition, the active damper body is selected to be activated, and the electric control valve and the MR damper body are in a closed and deactivated state; when the vehicle is in a high frequency working condition, the MR damper body is selected to be activated, and the electric control valve is in an open state, and the active damper body is in a closed and deactivated state; and when the vehicle is in an extreme working condition, the MR damper body and the active damper body are selected to be activated simultaneously.

[0011] The composite damper according to the embodiment of the present application organically combines the MR damping technology and the active damping technology, combines the advantages of both, and decouples and coordinates the MR damper body and the active damper body by means of the electric control valve to meet the damping requirements of the vehicle in low frequency, medium frequency, high frequency and extreme working conditions, and improve the ride comfort and handling stability of the vehicle. Moreover, even if the active damper body or the MR damper body fails, the composite damper still has certain damping function, and the ride comfort and handling stability of the vehicle are not greatly reduced.

[0012] In some embodiments of the present application, the MR damper body comprises a second outer cylinder, a second damping piston, a second floating piston and a second piston rod, the second outer cylinder is provided with a second cavity, the second floating piston is arranged in the second cavity to divide the second cavity into a second liquid cavity and a second gas cavity, the second damping piston is arranged in the second liquid cavity, one end of the second piston rod is connected with the second damping piston, the other end of the second piston rod is connected with the first piston rod, and the end of the second outer cylinder away from the second piston rod is connected with the first outer cylinder.

[0013] In some embodiments of the present application, the first piston rod is provided with a concave cavity, the opening of the concave cavity is arranged to be open towards the direction of the compression cavity, the second outer cylinder partially extends into the concave cavity, and the other end of the second piston rod is connected with the wall surface of the concave cavity.

[0014] In some embodiments of the present application, a gap is provided between the inner circumferential surface of the concave cavity and the outer circumferential surface of the second outer cylinder.

[0015] In some embodiments of the present application, the first liquid cavity, the second liquid cavity, the first piston rod, the concave cavity and the second piston rod are coaxially arranged.

[0016] In some embodiments of the present application, the side wall of the first outer cylinder is provided with a first connecting port and a second connecting port, the first connecting port is in communication with the recovery cavity, the second connecting port is in communication with the compression cavity, two ends of the hydraulic oil path are connected with the first connecting port and the second connecting port respectively, and two ends of the electric control valve are connected with the first connecting port and the second connecting port respectively.

[0017] In some embodiments of the present application, the accumulator is located at one end of the hydraulic oil path close to the first connecting port, and the electric hydraulic pump is located at one end of the hydraulic oil path close to the second connecting port.

[0018] In some embodiments of the present application, the accumulator is provided with a first cavity, a first floating piston is arranged in the first cavity, the first floating piston divides the first cavity into a first gas cavity and a third liquid cavity, the third liquid cavity is provided with a communication port, and the communication port is in communication with the hydraulic oil path.

[0019] In some embodiments of the present application, the active damper body further comprises a pressure sensor, the pressure sensor is arranged on the hydraulic oil path and located between the second connecting port and the electric hydraulic pump.

[0020] The second aspect embodiment of the present application provides a control method of a composite damper, applied to the composite damper of the first aspect embodiment, and the control method comprises the following steps:

[0021] judging a current working condition of a vehicle;

[0022] if the current working condition is a low-frequency working condition, controlling the electric control valve to be closed, the magnetorheological damper body to be powered off and the electric hydraulic pump to be started;

[0023] if the current working condition is a high-frequency working condition, controlling the electric control valve to be opened, the electric hydraulic pump to be closed and the magnetorheological damper body to be powered on.

[0024] According to the control method of the composite damper according to the second aspect of the present application, at least the following beneficial effects are achieved: during the driving of the vehicle, the current working condition of the vehicle is first determined to select the active damper body or the magnetorheological damper body to be activated; if the current working condition is in a low-frequency working condition, the active damper body is activated, the electric control valve and the magnetorheological damper body are in a closed and deactivated state, the electric hydraulic pump of the active damper body can establish oil pressure and generate active force, the first damping piston of the active damper body can generate damping force, and meanwhile, the damping function of the active damper body is prevented from being affected by the electric control valve and the magnetorheological damper body; if the current working condition is in a high-frequency working condition, the magnetorheological damper body is activated, the electric control valve is in an open state, and the electric hydraulic pump cannot establish oil pressure, so that the damping force generated on both sides of the first damping piston is prevented from affecting the damping control accuracy of the magnetorheological damper body.

[0025] In some embodiments of the present application, the control method further includes the following step: if the current working condition is an extreme working condition, the electric control valve is controlled to be closed, the electric hydraulic pump is activated, and the magnetorheological damper body is powered on.

[0026] The third aspect of the present application provides a vehicle including the composite damper according to the first aspect of the present application.

[0027] According to the vehicle according to the third aspect of the present application, at least the following beneficial effects are achieved: the composite damper with the above structure is used on the vehicle, the corresponding damping function can be selected in a low-frequency, medium-frequency and high-frequency working condition, the composite damper can provide excellent damping effect for the vehicle, and the vehicle has good driving smoothness and steering stability.

[0028] The fourth aspect of the present application provides an electronic device including:

[0029] at least one processor; and

[0030] a memory connected with the at least one processor in communication; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the control method of the composite damper according to the second aspect of the present application.

[0031] The fifth aspect of the present application provides a computer readable storage medium having a computer program stored thereon, and the program is executed by a processor to implement the control method of the composite damper according to the second aspect of the present application.

[0032] Other features and advantages of the present application will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the application. The purposes and other advantages of the present application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0033] FIG. 1 is a structural schematic diagram of a composite damper according to an embodiment of the present application;

[0034] FIG. 2 is a structural schematic diagram of a connection between a first piston rod and a second piston rod in a composite damper according to an embodiment of the present application;

[0035] FIG. 3 is a flowchart of a control method of a composite damper according to an embodiment of the present application;

[0036] FIG. 4 is a flowchart of a control method of a composite damper according to another embodiment of the present application;

[0037] FIG. 5 is a structural schematic diagram of an electronic device according to an embodiment of the present application.

[0038] Reference numerals: 110, second outer cylinder; 120, second damping piston; 130, second piston rod; 140, second floating piston; 150, first sub-cavity; 160, second sub-cavity; 170, second gas cavity; 180, wire harness; 210, first outer cylinder; 220, first damping piston; 230, first piston rod; 240, first liquid cavity; 250, concave cavity; 260, accumulator; 261, first gas cavity; 262, first floating piston; 263, third liquid cavity; 270, electric hydraulic pump; 280, pressure sensor; 290, gap; 300, electric control valve. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described in detail below with reference to the attached drawings, which are meant to be exemplary, and are not to be construed as limiting the present application.

[0040] In the description of the present application, it is to be understood that the features defined with "first", "second" can include one or more of the features explicitly or implicitly. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0041] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] The suspension system is an important part in the automobile for connecting the vehicle body and the wheels, which is generally composed of elastic elements, guide mechanisms and shock absorbers, etc. Its main function is to buffer and attenuate the impact load generated by the road surface, so as to suppress the bouncing of the wheels and reduce the irregular vibration of the vehicle body, thereby improving and enhancing the ride comfort and handling stability of the vehicle.

[0043] The suspension system can be divided into passive suspension, semi-active suspension and active suspension. Among them, the active shock absorber is a key component in the active suspension. When the active shock absorber works, the electric hydraulic pump of the active shock absorber pumps oil into the recovery cavity or compression cavity of the outer cylinder to drive the piston on the piston rod to move along the axial direction of the outer cylinder, so as to control the movement and force of the piston rod, thereby controlling the posture and vibration of the vehicle body.

[0044] The active shock absorber can improve the comfort and handling of the vehicle in the medium frequency and low frequency vibration working conditions, and can meet the basic low frequency control requirements. However, the application of the active shock absorber in high frequency working conditions still has limitations, and the range of active force is limited. Specifically, in high frequency (such as frequency above 12 Hz) working conditions, the vibration control effect of the active shock absorber is worse than that of the magnetorheological shock absorber due to the response bandwidth limitation of the electric hydraulic pump.

[0045] Based on the above technical problems, the present application provides a composite shock absorber and its control method, vehicle, electronic device and medium, which can play an excellent damping effect in low frequency, medium frequency and high frequency working conditions, thereby improving the ride comfort and handling stability of the vehicle.

[0046] The composite shock absorber and its control method, vehicle, electronic device and medium provided by the embodiments of the present application are described below with reference to FIGS. 1-5.

[0047] As shown in FIGS. 1 and 2, the composite shock absorber according to the first aspect of the present application comprises an active shock absorber body, a magnetorheological shock absorber body and an electric control valve 300.

[0048] The structure of the active shock absorber body comprises a first outer cylinder 210, a first damping piston 220, a first piston rod 230, a hydraulic oil circuit, an energy accumulator 260 and an electric hydraulic pump 270.

[0049] The first outer cylinder 210 is hollow inside to form a first liquid cavity 240, and the first damping piston 220 is arranged in the first liquid cavity 240, the outer circumferential surface of the first damping piston 220 is in contact with the inner circumferential surface of the first liquid cavity 240, and the first damping piston 220 can move in the axial direction of the first outer cylinder 210. Moreover, the first damping piston 220 divides the first liquid cavity 240 into a recovery cavity and a compression cavity, and the volume ratio between the recovery cavity and the compression cavity changes when the first damping piston 220 moves axially. The recovery cavity and the compression cavity are both filled with oil, and because the first damping piston 220 is provided with a damping channel, the recovery cavity and the compression cavity are in communication with each other, and the oil can flow between the recovery cavity and the compression cavity.

[0050] In this embodiment, the first outer cylinder 210 can be cylindrical, and the axial direction of the first outer cylinder 210 extends in the up-down direction, and the first liquid cavity 240 is a cylindrical cavity.

[0051] One end of the first piston rod 230 is fixedly connected to the first damping piston 220, and the other end of the first piston rod 230 penetrates the first outer cylinder 210, so that the other end of the first piston rod 230 can be fixedly connected to the vehicle body, the first outer cylinder 210 can be connected to the corresponding control arm, and the first piston rod 230 can drive the first damping piston 220 to move relative to the first outer cylinder 210.

[0052] In this embodiment, the upper end surface of the first outer cylinder 210 is provided with a first shaft hole, the first piston rod 230 penetrates the first shaft hole, the outer circumferential surface of the first piston rod 230 is in contact with the inner circumferential surface of the first shaft hole, and a sealing member such as a sealing ring is arranged between the first piston rod 230 and the first shaft hole to prevent oil from leaking from the gap between the first piston rod 230 and the first shaft hole. The upper end of the first piston rod 230 is provided with a connecting portion, so that the first piston rod 230 is connected to the vehicle body through the connecting portion.

[0053] The accumulator 260 and the electric hydraulic pump 270 are arranged on the hydraulic oil path, the hydraulic oil path is filled with oil, and the oil can flow into the electric hydraulic pump 270 and the accumulator 260. When the electric hydraulic pump 270 operates, the electric hydraulic pump 270 can provide driving force to drive the oil in the hydraulic oil path to flow. Moreover, the two ends of the hydraulic oil path are in communication with the recovery cavity and the compression cavity of the first outer cylinder 210, respectively, so that the oil can flow through the hydraulic oil path, the electric hydraulic pump 270, the accumulator 260, the recovery cavity, and the compression cavity. It can be understood that through the forward and reverse rotation of the electric hydraulic pump 270, the active damper body can generate active force and damping force.

[0054] Specifically, the accumulator 260 is internally hollowed to form a first cavity, and the first cavity is provided with a first floating piston 262. The inner circumferential surface of the first cavity is in contact with the outer circumferential surface of the first floating piston 262, and the first floating piston 262 can move in the axial direction of the accumulator 260. In this embodiment, the first cavity is in a cylindrical shape.

[0055] Moreover, the first floating piston 262 divides the first cavity into a first gas cavity 261 and a third liquid cavity 263. When the first floating piston 262 moves in the axial direction, the volume ratio between the first gas cavity 261 and the third liquid cavity 263 changes. The third liquid cavity 263 is provided with a communication port, which is in communication with a hydraulic oil passage. Therefore, the oil in the hydraulic oil passage can flow into the third liquid cavity 263. It can be understood that the first gas cavity 261 is filled with inert gas such as nitrogen, and the third liquid cavity 263 is filled with oil. A pipeline can be used to provide the hydraulic oil passage. During the movement of the first piston rod 230, the first floating piston 262 moves in the first cavity, ensuring that the oil is always filled in the recovery cavity, the compression cavity, the hydraulic oil passage, the electric hydraulic pump 270, and the third liquid cavity 263.

[0056] The magneto-rheological damper body is arranged in the compression cavity of the first outer cylinder 210, and the opposite ends of the magneto-rheological damper body are fixedly connected with the first outer cylinder 210 and the first piston rod 230, respectively, and the opposite ends of the magneto-rheological damper body can approach or move away from each other. It can be understood that when the active damper body operates, the first piston rod 230 moves linearly relative to the first outer cylinder 210, at this time, the magneto-rheological damper body is driven by the first piston rod 230 to stretch and contract. Alternatively, when the magneto-rheological damper body operates, the magneto-rheological damper body stretches and contracts, at this time, the first piston rod 230 moves relative to the first outer cylinder 210.

[0057] The magneto-rheological damper body is a single-cylinder magneto-rheological damper. Specifically, the structure of the magneto-rheological damper body includes a second outer cylinder 110, a second damping piston 120, a second floating piston 140, and a second piston rod 130.

[0058] The second outer cylinder 110 is provided with a second cavity, and the second floating piston 140 is arranged in the second cavity. The outer circumferential surface of the second floating piston 140 is in contact with the inner circumferential surface of the second cavity, and the second floating piston 140 can move relative to the second outer cylinder 110. The second floating piston 140 divides the second cavity into a second liquid cavity and a second gas cavity 170. During the movement of the second floating piston 140, the volume ratio between the second liquid cavity and the second gas cavity 170 changes. It can be understood that the second gas cavity 170 is filled with inert gas such as nitrogen, and the second liquid cavity is filled with magneto-rheological fluid. The second floating piston 140 has good sealing effect, which prevents the magneto-rheological fluid and the inert gas from contacting and mixing.

[0059] The second damping piston 120 is arranged in the second liquid cavity of the second outer cylinder 110, and the second damping piston 120 divides the second liquid cavity into a first sub-cavity 150 and a second sub-cavity 160. In the embodiment, the first sub-cavity 150 is located above the second sub-cavity 160, and the second sub-cavity 160 is located above the second gas cavity 170.

[0060] One end of the second piston rod 130 is fixedly connected with the second damping piston 120, and the other end of the second piston rod 130 is arranged in the second outer cylinder 110 and fixedly connected with the first piston rod 230. The end of the second outer cylinder 110 away from the second piston rod 130 is fixedly connected with the first outer cylinder 210. Therefore, the first piston rod 230 and the second piston rod 130 jointly form a piston rod structure of the composite damper.

[0061] It can be understood that the second damping piston 120 is provided with a damping channel, so that the first sub-cavity 150 and the second sub-cavity 160 are connected, and the magnetorheological fluid can flow between the first sub-cavity 150 and the second sub-cavity 160 through the damping channel of the second damping piston 120. The second damping piston 120 is provided with a coil winding, and the size of the magnetic field can be changed by controlling the current size of the coil winding, so as to control the damping force of the magnetorheological damper body. Specifically, when the coil winding is powered, if the current increases, the generated magnetic field increases, so the viscosity of the magnetorheological fluid increases, and the damping force of the magnetorheological damper body increases; if the current decreases, the generated magnetic field decreases, so the viscosity of the magnetorheological fluid decreases, and the damping force of the magnetorheological damper body decreases.

[0062] During the movement of the second piston rod 130, the second floating piston 140 can move with it to ensure that the magnetorheological fluid always fills the first sub-cavity 150 and the second sub-cavity 160.

[0063] In the embodiment, the second outer cylinder 110 can be in a cylindrical shape, the axial direction of the second outer cylinder 110 extends in the up-down direction, and the second cavity is a cylindrical cavity. The upper end surface of the second outer cylinder 110 is provided with a second shaft hole, the second piston rod 130 passes through the second shaft hole, the outer circumferential surface of the second piston rod 130 is in contact with the inner circumferential surface of the second shaft hole, and a sealing element is arranged between the second piston rod 130 and the second shaft hole to prevent the magnetorheological fluid from leaking from the gap between the second piston rod 130 and the second shaft hole. The second piston rod 130 and the first piston rod 230 are hollow inside, so that the wire harness 180 of the coil winding can be routed and arranged through the second piston rod 130 and the first piston rod 230 and electrically connected with the power supply. The lower end surface of the second outer cylinder 110 is fixedly connected with the wall surface of the compression cavity.

[0064] Since the magnetorheological fluid is a suspension composed of soft magnetic particles and non-magnetic oil, the oil in the active damper body and the magnetorheological fluid in the magnetorheological damper body are separated by the sealing structure, which prevents the magnetorheological fluid from leaking into the compression chamber and causing the particles in the magnetorheological fluid to wear the electric hydraulic pump 270 or even cause the electric hydraulic pump 270 to jam.

[0065] The two ends of the electric control valve 300 are respectively connected to the recovery chamber and the compression chamber of the first outer cylinder 210. The electric control valve 300 is arranged to bypass the electric hydraulic pump 270. When the electric control valve 300 is open, the electric hydraulic pump 270 of the active damper body cannot establish oil pressure. When the electric control valve 300 is closed, the electric hydraulic pump 270 of the active damper body can establish oil pressure and generate active force. Therefore, the electric control valve 300 can be used to decouple the active damper body and the magnetorheological damper body.

[0066] In this embodiment, the electric control valve 300 is an electromagnetic valve. The side wall of the first outer cylinder 210 is provided with a first connecting port and a second connecting port. The first connecting port is connected to the recovery chamber, and the second connecting port is connected to the compression chamber. The two ends of the hydraulic oil line are respectively connected to the first connecting port and the second connecting port, so that the two ends of the hydraulic oil line are respectively connected to the recovery chamber and the compression chamber. The hydraulic oil line is connected in parallel with a bypass oil line, and the electric control valve 300 is arranged on the bypass oil line, so that the two ends of the electric control valve 300 are respectively connected to the first connecting port and the second connecting port through the pipeline. The accumulator 260 is located at one end of the hydraulic oil line close to the first connecting port, and the electric hydraulic pump 270 is located at one end of the hydraulic oil line close to the second connecting port.

[0067] In some embodiments, as shown in FIG. 1, the active damper body further comprises a pressure sensor 280. The pressure sensor 280 is arranged on the hydraulic oil line, and the pressure sensor 280 is located between the second connecting port and the electric hydraulic pump 270. The pressure sensor 280 can obtain the oil pressure data of the hydraulic oil line in real time, so as to adjust the output power of the electric hydraulic pump 270 according to the oil pressure data when the active damper body is working, thereby controlling the damping force of the active damper body.

[0068] In some embodiments, as shown in FIGS. 1 and 2, the first piston rod 230 is provided with a recessed cavity 250, and the opening of the recessed cavity 250 is arranged to open towards the compression chamber. In this embodiment, the recessed cavity 250 is cylindrical, and the size of the recessed cavity 250 can allow the second piston rod 130 and the second outer cylinder 110 to extend into.

[0069] The second outer cylinder 110 partially extends into the concave cavity 250 of the first piston rod 230, and the other end of the second piston rod 130 is connected with the wall surface of the concave cavity 250. In this way, the internal space of the first piston rod 230 can be effectively utilized, and the stroke of the magneto-rheological damper body is increased when the stroke of the active damper body is constant, thereby increasing the damping force range provided by the composite damper.

[0070] Further, there is a gap 290 between the inner circumferential surface of the concave cavity 250 and the outer circumferential surface of the second outer cylinder 110. The size of the gap 290 can be designed according to actual conditions.

[0071] In the embodiment, the first liquid cavity 240, the second liquid cavity, the first piston rod 230, the concave cavity 250 and the second piston rod 130 are coaxially arranged.

[0072] Because there is a gap 290 between the concave cavity 250 and the second outer cylinder 110, the compression cavity and the concave cavity 250 are filled with oil, so that the second piston rod 130 moves relative to the second outer cylinder 110 when the first piston rod 230 moves relative to the first outer cylinder 210. At this time, the oil can flow between the compression cavity and the concave cavity 250 through the gap 290, so that the oil can flow freely, thereby avoiding the problems of cavitation and high damping force in the concave cavity 250 when the first piston rod 230 moves up and down. Therefore, the active force of the active damper body can be increased. At the same time, for the compression cavity, the oil pressure acting area of the active damper body is the cross-sectional area of the compression cavity of the first outer cylinder 210, rather than the annular area surrounded by the inner circumferential surface of the first outer cylinder 210 and the outer circumferential surface of the second outer cylinder 110. In this way, the acting force area of the oil in the compression cavity can be increased, that is, the pressurization area of the active damper body is increased, thereby greatly improving the active force of the active damper body.

[0073] Of course, in some embodiments, the first piston rod 230 is not provided with the concave cavity 250, and the upper end of the second piston rod 130 is fixedly connected with the lower end of the first piston rod 230.

[0074] In the composite damper provided in the embodiment, the magneto-rheological damper body is arranged in the compression cavity of the active damper body, and the opposite ends of the magneto-rheological damper body are fixedly connected with the first outer cylinder 210 and the first piston rod 230 of the active damper body, respectively. Therefore, the extension and contraction damping directions of the magneto-rheological damper body and the active damper body are consistent, and the magneto-rheological damper body and the active damper body can perform synchronous extension and contraction actions during the operation of at least one of the magneto-rheological damper body and the active damper body, so as to dampen the vehicle.

[0075] And, on the basis of the above structure, the electric control valve 300 is added, the accumulator 260 and the electric hydraulic pump 270 connected in series with the electric control valve 300 and the hydraulic oil circuit of the active damper body are arranged in parallel, then when the vehicle is in a medium frequency or low frequency working condition (i.e. the frequency is less than or equal to 12 Hz), the active damper body is selected to be activated, and the electric control valve 300 and the magnetorheological damper body are in a closed and deactivated state, so as to avoid the electric control valve 300 and the magnetorheological damper body affecting the damping force control of the active damper body; when the vehicle is in a high frequency working condition, the magnetorheological damper body is selected to be activated, and the electric control valve 300 is in an open state, so as to decouple the magnetorheological damper body and the active damper body, and make the active damper body in a closed and deactivated state, so as to avoid the active damper body affecting the damping force control of the magnetorheological damper body; and when the vehicle is in an extreme working condition, the magnetorheological damper body and the active damper body are selected to be activated at the same time.

[0076] It can be understood that the composite damper of the embodiment of the present application organically fuses the magnetorheological damping technology and the active damping technology, combines the advantages of both, and decouples and controls the magnetorheological damper body and the active damper body by means of the electric control valve 300, so as to cope with the damping requirements of the vehicle in low frequency, medium frequency, high frequency and extreme working conditions, and improve the ride comfort and handling stability of the vehicle.

[0077] Moreover, the composite damper structure is unique and low in cost, and can decouple the active damper body and the magnetorheological damper body, so that the active damper body or the magnetorheological damper body can be used alone according to the low frequency, medium frequency and high frequency working conditions of the vehicle, and the damping force can be precisely controlled, so as to avoid mutual interference of the two.

[0078] Meanwhile, even if one of the active damper body and the magnetorheological damper body fails, the composite damper still has certain damping function, so as to prevent the entire composite damper from failing, thereby improving the operation reliability of the composite damper, and avoiding the ride comfort and handling stability of the vehicle from being greatly reduced.

[0079] In addition, since the damping force of the magnetorheological damper body changes greatly in high temperature and low temperature environments, the electric control valve 300 can be used to compensate the change of the damping force of the magnetorheological damper body caused by temperature change.

[0080] Specifically, when the magneto-rheological damper body is in the power-off state, the active damper body is started and provides a damping force. At this time, since the magneto-rheological damper body has a high damping force due to temperature change, the total damping force of the compound damper is equal to the sum of the damping forces of the active damper body and the magneto-rheological damper body, which exceeds the damping force requirement of the vehicle. Then, the opening size of the electric control valve 300 can be adjusted to increase the oil flow through the electric control valve 300 and reduce the oil flow into the first liquid cavity 240, thereby reducing the damping force generated at the first damping piston 220, so that the damping force provided by the compound damper meets the damping force requirement of the vehicle, and the purpose of adjusting the electric control valve 300 to compensate for the damping force in a low-temperature environment or a high-temperature environment is achieved.

[0081] As shown in FIG. 3, the control method of the compound damper according to the second aspect of the present application is applied to the compound damper according to the first aspect of the present application, and the control method of the compound damper specifically includes the following steps:

[0082] Step S1: judging the current working condition of the vehicle.

[0083] Step S2: if the current working condition is a low-frequency working condition, controlling the electric control valve 300 to be closed, the magneto-rheological damper body to be power-off, and the electric hydraulic pump 270 to be started.

[0084] Step S3: if the current working condition is a high-frequency working condition, controlling the electric control valve 300 to be opened, the electric hydraulic pump 270 to be closed, and the magneto-rheological damper body to be powered on.

[0085] Since the response time of the magneto-rheological damper body is relatively fast, generally about 10 ms, and the output active force of the active damper body is generally slower than that of the magneto-rheological damper body, the magneto-rheological damper body can be applied to the high-frequency working condition with high response time requirement and mainly adjust the ride comfort of the vehicle in real time, while the active damper body can be applied to the medium-frequency and low-frequency working conditions with low response time requirement, and the response time is generally about 100 ms, mainly adjusting the handling stability of the vehicle.

[0086] In the process of driving the vehicle, the current working condition of the vehicle is first judged to select the magneto-rheological damper body or the active damper body to be started.

[0087] If the current working condition is in the low-frequency working condition, the active damper body can be started, the electric control valve 300 and the magneto-rheological damper body are in the closed and deactivated state, the electric hydraulic pump 270 of the active damper body can establish oil pressure and generate active force, so that the first damping piston 220 of the active damper body can generate damping force, and at the same time, the damping function of the active damper body is prevented from being affected by the electric control valve 300 and the magneto-rheological damper body.

[0088] Specifically, in the process of the active damper body working, if the electric control valve 300 is opened, the electric control valve 300 will bypass the electric hydraulic pump 270, reduce the active force generated by the active damper body, cause the damping force of the composite damper to be too small to meet the required damping force of the vehicle, and thus affect the ride comfort of the vehicle; if the magnetorheological damper body is powered on, the magnetorheological damper body will generate a damping force, causing the damping force of the composite damper to be too large to meet the required damping force of the vehicle, which will also affect the ride comfort of the vehicle. At the same time, because the damping force is too large, the transmitted impact is too strong, and the buffering effect is reduced.

[0089] When the active damper body is running, the damping force provided by the active damper body can be adjusted by controlling the output of the electric hydraulic pump 270.

[0090] Of course, in a high-temperature environment or a low-temperature environment, the magnetorheological damper body will change the damping force, at which time the opening of the electric control valve 300 can be appropriately adjusted to complete the damping force compensation.

[0091] If the current working condition is in a high-frequency working condition, the magnetorheological damper body can be started, and the electric control valve 300 is in an open state, so that the electric hydraulic pump 270 cannot play the role of establishing oil pressure, thereby avoiding the damping force generated on both sides of the first damping piston 220 to affect the damping control accuracy of the magnetorheological damper body.

[0092] Specifically, in the process of the magnetorheological damper body being powered on, the damping force generated by the magnetorheological damper body can be adjusted by adjusting the current, so that the damping force of the composite damper meets the damping requirements of the vehicle. Because the electric control valve 300 is in a fully open state, the electric control valve 300 bypasses the electric hydraulic pump 270, so that the first damping piston 220 cannot generate a damping force and can only be provided by the magnetorheological damper body, so that the magnetorheological damper body accurately controls the damping force. At this time, the second piston rod 130 will move the first piston rod 230, and the first piston rod 230 will move the first damping piston 220, so that the oil can flow to the bypass oil passage with the electric control valve 300 under the action of the first damping piston 220, reduce the oil flow through the first damping piston 220, and let the oil flow freely along the bypass oil passage to the recovery cavity or the compression cavity.

[0093] When the magnetorheological damper body is running, the damping force provided by the magnetorheological damper body can be adjusted by controlling the current of the magnetorheological damper body.

[0094] In some embodiments, as shown in FIG. 4, the control method of the composite damper further includes the following steps:

[0095] Step S4: If the current working condition is the extreme working condition, the control valve 300 is closed, the electric hydraulic pump 270 is started, and the magnetorheological damper body is powered on.

[0096] In the ride comfort control of the vehicle, the semi-active damping control technology is adopted. In the handling stability control of the vehicle, the active damping control technology is adopted. It can be understood that in the high-frequency working condition of the vehicle, the ride comfort is preferred, and therefore the damping force can be provided by the magnetorheological damper body. In the medium-frequency and low-frequency working condition of the vehicle, the handling stability is preferred, and therefore the damping force can be provided by the active damper body. In the extreme working condition of the vehicle, the semi-active damping technology and the active damping technology are adopted, so that the magnetorheological damper body and the active damper body simultaneously perform the damping function, and even if one of them fails, the composite damper still has the damping function.

[0097] The vehicle according to the third aspect of the present application comprises the composite damper according to the first aspect of the present application.

[0098] The composite damper is connected to the control arm on the vehicle body and the suspension of the vehicle respectively, can absorb mechanical energy and convert it into heat, form the damping effect on the motion, and thus realize the damping effect on the vehicle.

[0099] The composite damper with the above structure is used on the vehicle, can select the corresponding damping function (active damping function or semi-active damping function) in the low-frequency, medium-frequency and high-frequency working conditions, so that the composite damper can provide excellent damping effect for the vehicle, and ensure that the vehicle has good ride comfort and handling stability.

[0100] Specifically, the vehicle can be a private car, such as a sedan, an SUV, an MPV or a pickup truck, etc. The vehicle can also be an operational vehicle, such as a minibus, a bus, a small truck or a large trailer, etc. The vehicle can be a gasoline vehicle or a new energy vehicle. When the vehicle is a new energy vehicle, it can be a hybrid vehicle or a pure electric vehicle.

[0101] As shown in FIG. 5, the electronic device according to the fourth aspect of the present application comprises at least one processor, a memory, an input / output interface, a communication interface and a bus. The memory stores a computer program executable by the at least one processor. The computer program is executed by the at least one processor, so that the at least one processor can execute the control method of the composite damper according to the second aspect of the present application. The memory, the at least one processor, the input / output interface and the communication interface are connected to each other in the device through the bus.

[0102] It can be understood that the processor can be implemented in the form of a general-purpose CPU (i.e., central processing unit), a microprocessor, or one or more integrated circuits, etc., for executing relevant computer programs to implement the control method of the composite damper according to the second aspect of the present application.

[0103] The memory mainly includes a program storage area and a data storage area. The program storage area can store an operating system and at least one application program required by a function. The data storage area can store data created according to the use of the terminal. In addition, the memory can include a high-speed random access memory and can also include a nonvolatile memory such as at least one disk storage device, a flash memory device, or other nonvolatile solid-state memory device. In some examples, the memory can further include a memory remotely arranged with respect to the processor, and these remote memories can be connected to the device through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0104] The input / output interface is used to connect an input / output unit to realize information input and output. The input / output unit can be arranged in the device as a component or externally connected to the device to provide corresponding functions. The input unit can include a touch screen, a microphone, etc., and the output unit can include a display, a speaker, etc.

[0105] The communication interface is used to connect a communication unit to realize the communication interaction between the device and other devices. The communication unit can realize the communication function through a wired or wireless manner. The bus includes a path for transmitting information between various components (such as the processor, the memory, the input / output interface, and the communication interface) of the device.

[0106] According to the computer readable storage medium of the fifth aspect of the present application, a computer program is stored thereon, and the program is executed by the processor to implement the control method of the composite damper according to the second aspect of the present application.

[0107] The computer readable storage medium of the embodiments of the present application can adopt any combination of one or more computer readable media. The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination thereof. More specific examples (a non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the embodiments of the present application, the computer readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus or device.

[0108] The computer readable signal medium can include a data signal propagated in baseband or propagated as a carrier wave in a propagated data signal, in which computer readable program code is embodied. Such propagated data signal can take a variety of forms, including but not limited to electro-magnetic, optical or any suitable combination thereof. The computer readable signal medium can also be any computer readable medium that is not a storage medium and that can communicate, propagate or transport program for use by or in connection with an instruction execution system, apparatus or device.

[0109] The program code embodied on the computer readable medium can be transmitted using any suitable medium, including but not limited to wireless, wire line, optical fiber cable, RF, etc., or any suitable combination of the above.

[0110] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0111] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A composite vibration damper, characterized in that, include: The active shock absorber body includes a first outer cylinder, a first damping piston, a first piston rod, a hydraulic circuit, an accumulator, and an electric hydraulic pump. The first outer cylinder is provided with a first liquid chamber, and the first damping piston is disposed in the first liquid chamber, dividing the first liquid chamber into a recovery chamber and a compression chamber. The first damping piston can move axially along the first outer cylinder. One end of the first piston rod is connected to the first damping piston. The accumulator and the electric hydraulic pump are disposed on the hydraulic circuit, and the two ends of the hydraulic circuit are respectively connected to the recovery chamber and the compression chamber. The magnetorheological damper body is disposed in the compression chamber, and the opposite ends of the magnetorheological damper body are respectively connected to the first outer cylinder and the first piston rod; An electrically controlled valve, the two ends of which are respectively connected to the recovery chamber and the compression chamber.

2. The composite vibration damper according to claim 1, characterized in that, The magnetorheological damper body includes a second outer cylinder, a second damping piston, a second floating piston, and a second piston rod. The second outer cylinder has a second cavity, and the second floating piston is disposed in the second cavity to divide the second cavity into a second liquid cavity and a second gas cavity. The second damping piston is disposed in the second liquid cavity. One end of the second piston rod is connected to the second damping piston, and the other end is connected to the first piston rod. The end of the second outer cylinder away from the second piston rod is connected to the first outer cylinder.

3. The composite vibration damper according to claim 2, characterized in that, The first piston rod has a recessed cavity with the opening facing the compression chamber. The second outer cylinder extends into the recessed cavity, and the other end of the second piston rod is connected to the wall of the recessed cavity.

4. The composite vibration damper according to claim 3, characterized in that, There is a certain gap between the inner circumferential surface of the concave cavity and the outer circumferential surface of the second outer cylinder.

5. The composite vibration damper according to claim 4, characterized in that, The first liquid chamber, the second liquid chamber, the first piston rod, the concave cavity, and the second piston rod are coaxially arranged.

6. The composite vibration damper according to claim 1, characterized in that, The side wall of the first outer cylinder is provided with a first connection port and a second connection port. The first connection port is connected to the recovery chamber, and the second connection port is connected to the compression chamber. The two ends of the hydraulic oil circuit are respectively connected to the first connection port and the second connection port, and the two ends of the electric control valve are respectively connected to the first connection port and the second connection port.

7. The composite vibration damper according to claim 6, characterized in that, The accumulator is located at the end of the hydraulic circuit near the first connection port, and the electric hydraulic pump is located at the end of the hydraulic circuit near the second connection port.

8. The composite vibration damper according to claim 7, characterized in that, The accumulator is provided with a first cavity, and a first floating piston is provided in the first cavity. The first floating piston divides the first cavity into a first gas cavity and a third liquid cavity. The third liquid cavity is provided with a connecting port, and the connecting port is connected to the hydraulic oil circuit.

9. The composite vibration damper according to claim 7, characterized in that, The active damper body also includes a pressure sensor, which is located on the hydraulic oil circuit and between the second connection port and the electric hydraulic pump.

10. A control method for a composite vibration damper, characterized in that, Applied to the composite vibration damper as described in any one of claims 1 to 9, the control method includes the following steps: Determine the current operating condition of the vehicle; If the current operating condition is a low-frequency operating condition, control the electronically controlled valve to close, de-energize the magnetorheological damper body, and start the electric hydraulic pump; If the current operating condition is a high-frequency operating condition, control the opening of the electronically controlled valve, the closing of the electric hydraulic pump, and the energization of the magnetorheological vibration damper body.

11. The control method for the composite vibration damper according to claim 10, characterized in that, It also includes the following steps: if the current working condition is an extreme working condition, control the electronically controlled valve to close, the electric hydraulic pump to start, and the magnetorheological damper body to be energized.

12. A vehicle, characterized in that, Includes the composite vibration damper as described in any one of claims 1 to 9.

13. An electronic device, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the control method for the composite damper as described in claim 10 or 11.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the control method for the composite vibration damper as described in claim 10 or 11.

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