Active hydraulic suspension system based on EHA principle

Abstract

The invention belongs to the technical field of vehicle hydraulic suspension, and particularly relates to an active hydraulic suspension system based on the EHA principle, the active hydraulic suspension system comprises a suspension hydraulic cylinder and a damping lifting rod body slidably stretching in the suspension hydraulic cylinder, and the suspension hydraulic cylinder is divided into a rod cavity and a rodless cavity by a damping part of the damping lifting rod body. The interior of the suspension hydraulic cylinder is divided into the rod cavity and the rodless cavity through the damping lifting rod body, the rod cavity and the rodless cavity are matched with the oil way conveying body to form oil way circulation, the gear pump and the hydraulic pump are correspondingly arranged at the upper end and the lower end of the oil way conveying body, and oil can be supplied to the rodless cavity and the rod cavity; oil supply damping supporting can be stably carried out in a complex road surface environment, the active radiator can actively carry out active heat conduction and heat dissipation on the temperature of oil liquid in the oil way conveying body, the device can carry out oil liquid conveying damping on suspension according to road surface bumping changes, the motion control performance is excellent, the heat dissipation capacity is excellent, and the requirement for active suspension in different environments is met.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle hydraulic suspension, and in particular relates to an active hydraulic suspension system based on the EHA principle. Background Art

[0002] The core of the EHA active hydraulic suspension system's braking and anti-bumping properties lies in its dynamic control through the active adjustment capabilities of the EHA (electrohydraulic actuator). When braking on bumpy roads, the system uses sensors to monitor parameters such as vehicle posture, wheel bounce, road surface roughness, and brake pressure in real time, transmitting this information to a controller. Based on a pre-set control strategy, the controller calculates the required suspension adjustment. It then activates the motor in the EHA to drive the hydraulic pump or directly adjusts the hydraulic valve to alter the hydraulic oil pressure and flow within the suspension cylinder, thereby rapidly adjusting the suspension's stiffness and damping characteristics. This active intervention effectively offsets the impact of bumpy roads, suppressing changes in vehicle pitch and roll, minimizing fluctuations in wheel-to-ground adhesion caused by road irregularities, and ensuring stable and safe braking.

[0003] Off-road vehicles require excellent maneuverability, a performance primarily achieved through active suspension. Compared to active suspension systems used on road vehicles, off-road vehicle suspensions require greater travel and enhanced environmental adaptability. Active suspensions based on electrohydrostatic actuators have become a key development direction due to their superior overall performance. Compared to other active suspension systems, they offer significant advantages such as compactness, low energy consumption, and electrification.

[0004] However, existing electro-hydraulic active suspensions struggle to meet the demanding requirements of off-road vehicles. The control response speed and precision of the suspension brakes are insufficient for long travels and adapting to complex terrain and harsh environments. Due to the forward shift of the vehicle's center of gravity during braking, wheel loads change significantly, and bumpy roads exacerbate wheel bouncing. Consequently, their damping and cushioning effects are relatively inadequate, making it difficult to adjust to the terrain and actively supply oil. This significantly impacts the suspension's ability to effectively control motion on complex terrain, such as sections with severe bumps. Suspension performance is relatively inadequate, and energy utilization is inefficient. Furthermore, the existing suspension's oil supply can overheat due to prolonged operation of the pump, resulting in insufficient heat dissipation and cooling capabilities. This significantly impacts the suspension's normal damping and support forces, preventing it from providing appropriate support and damping forces in a timely manner. This makes it difficult to effectively suppress severe vehicle vibration and posture deviation, which in turn impacts braking effectiveness and vehicle safety. Consequently, the suspension system fails to fully meet the high-performance suspension system requirements for braking under harsh road conditions. Therefore, we propose an active hydraulic suspension system based on the EHA principle to address these issues. Summary of the Invention

[0005] The purpose of the present invention is to provide an active hydraulic suspension system based on the EHA principle in order to solve the above problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions: an active hydraulic suspension system based on the EHA principle, comprising a suspension hydraulic cylinder and a damping lifting rod body that slides and retracts inside the suspension hydraulic cylinder, wherein the interior of the suspension hydraulic cylinder is divided into a rod chamber and a rodless chamber by the damping portion of the damping lifting rod body;

[0007] The damping part of the damping lifting rod body is provided with an oil-feeding electromagnetic valve body communicating with the rod cavity and the rodless cavity. The outer side of the suspension hydraulic cylinder is respectively provided with two oil delivery ends communicating with the rod cavity and the rodless cavity. The two oil delivery ends are integrally connected with an oil conveying body.

[0008] One side of the oil conveying body is connected to two gear pumps for supplying oil to the rodless chamber, and the other side of the oil conveying body is connected to a hydraulic pump for supplying oil to the rod chamber. A motor for driving the hydraulic pump is provided on the side of the hydraulic pump;

[0009] Active radiators are provided at the pipelines of the oil conveying body close to the hydraulic pump and the gear pump.

[0010] In the above-mentioned active hydraulic suspension system based on the EHA principle, the damping lifting rod body includes a damping block and a damping rod. The damping block is slidably connected to the inner side of the suspension hydraulic cylinder, and the damping rod is fixedly installed on the top of the damping block. The top of the damping block extends with a rod cavity and a suspension hydraulic cylinder in sequence.

[0011] In the above-mentioned active hydraulic suspension system based on the EHA principle, a movable spring is sleeved on the top of the damping rod, and both ends of the movable spring are fixedly connected to the suspension hydraulic cylinder and the damping rod respectively.

[0012] In the above-mentioned active hydraulic suspension system based on the EHA principle, an accumulator connected to the rod chamber is provided on the side of the suspension hydraulic cylinder away from the oil delivery end, and two one-way guide pipes connected to the two sides of the oil delivery body are provided on the side of the accumulator.

[0013] In the above-mentioned active hydraulic suspension system based on the EHA principle, the accumulator is composed of a pressurized oil tank, one-way control valves are fixedly installed on the two one-way guide pipes, and a pressure safety valve is correspondingly provided on the oil circuit conveying body.

[0014] In the above-mentioned active hydraulic suspension system based on the EHA principle, the oil-feeding solenoid valve body is an electrified valve body, and a damping end is provided on the oil-feeding solenoid valve body, and the opening and closing damping of the damping end is controlled by the oil-feeding solenoid valve body.

[0015] In the above-mentioned active hydraulic suspension system based on the EHA principle, the oil circuit delivery body is connected to the rod chamber and the rodless chamber by the oil delivery end respectively, and the oil circuit delivery body, the oil delivery end, the rod chamber, the rodless chamber and the oil delivery solenoid valve body form an oil supply circulation, and the active radiator is installed correspondingly at the oil delivery port of the oil circuit delivery body near the hydraulic pump and the gear pump.

[0016] In the above-mentioned active hydraulic suspension system based on the EHA principle, a generator is provided on the side of the electric motor, the electric motor is a four-quadrant operating motor, and the hydraulic pump is a bidirectional pump.

[0017] In the above-mentioned active hydraulic suspension system based on the EHA principle, a temperature detection controller is correspondingly provided on the oil conveying body, and the temperature detection controller is electrically connected to the plurality of active radiators.

[0018] In the above-mentioned active hydraulic suspension system based on the EHA principle, the active radiator includes a cooling fin rack and an air-cooled cooling fan. Multiple cooling fin racks are fixedly sleeved on the oil delivery body near the oil delivery port of the hydraulic pump and the gear pump, and the air-cooled cooling fan is fixedly installed on the outside of the cooling fin rack.

[0019] Compared with the existing technology, the beneficial effects of the present invention are:

[0020] 1. A damping lifting rod body is provided inside the suspension hydraulic cylinder, and the rod body of the damping lifting rod body slides and extends out of the suspension hydraulic cylinder to play a telescopic damping role, and the interior of the suspension hydraulic cylinder is divided into a rod chamber and a rodless chamber by the damping lifting rod body. The rod chamber and the rodless chamber can respectively carry out oil supply injection and oil damping discharge, thereby performing oil supply damping and supporting effects. When high-intensity suspension vibration and bumps occur, the rod chamber and the rodless chamber can respectively carry out oil supply damping and oil supply support, buffering support and protection, thereby realizing the basic elasticity and damping functions of the vehicle suspension.

[0021] 2. By providing an oil-feeding solenoid valve body in the damping part of the damping lifting rod body, when the power is connected, it plays a damping or opening effect on the damping activities of the rod chamber and the rodless chamber, and plays an active damping role when oil is delivered. When the rod chamber and the rodless chamber are subjected to vibration, the oil can be stably delivered by the oil to play a damping buffering and supporting effect. The suspension load is stable and the vibration buffering protection effect is good. In addition, the oil-feeding solenoid valve body can stably perform damping support in the power-off state, and the operation adaptation is stable.

[0022] 3. By providing oil delivery ends connected to the rod chamber and the rodless chamber respectively on the side of the suspension hydraulic cylinder, an integrally connected oil circuit delivery body is provided on the two oil delivery ends. The oil circuit delivery body can deliver oil to the rod chamber respectively, and then discharge oil from the rodless chamber to complete the oil delivery and oil discharge operations, or reverse oil supply and oil delivery. The oil is supplied and guided and discharged by the two oil delivery ends respectively. After the oil completes a cycle in the oil circuit delivery body, it enters the suspension hydraulic cylinder again to complete the closed-cycle oil supply operation, realizing continuous oil delivery. Stable oil supply and damping support can be performed in complex road environments to meet the special requirements of active suspension of off-road vehicles.

[0023] 4. By connecting two gear pumps that supply oil to the rodless cavity in the oil circuit delivery body, the rodless cavity can be continuously supplied with oil under normal circumstances. The oil circuit delivery body is connected to a hydraulic pump that delivers oil to the rod cavity, and the hydraulic pump is driven by an electric motor to supply oil to the rod cavity. Therefore, in the event of severe bumps and vibrations, the gear pump can supply oil to the rodless cavity, or the hydraulic pump can supply oil to the rod cavity, and forward or reverse oil supply can be performed respectively, which makes it convenient for the suspension hydraulic cylinder to operate the hydraulic pump or gear pump respectively according to the bump intensity and braking requirements. The operation is stable and convenient, and the motion control performance is excellent.

[0024] 5. When the gear pump is running and supplying oil to the rodless cavity, it can drive the hydraulic pump to drive in the opposite direction, and then drive the electric motor to generate electricity, complete energy conversion and recovery, and facilitate the recovery of electric energy. The electric energy recovery capability can improve the energy efficiency of the actuator.

[0025] 6. By installing active radiators in the pipelines of the oil circuit transport body close to the hydraulic pump and gear pump, the oil temperature in the oil circuit transport body can be actively conducted and dissipated, achieving rapid heat dissipation, stable and efficient heat dissipation, and excellent adaptability, so as to more efficiently exchange the heat of the radiator to the environment.

[0026] In summary: This solution can form an entire oil circuit cycle, and can separately transport oil and damp the two suspension chambers according to changes in road bumps. It has excellent motion control performance, high energy efficiency, adaptability to harsh environments, and excellent heat dissipation capabilities, meeting the requirements of active suspension in different environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural perspective front view of an active hydraulic suspension system based on the EHA principle provided by the present invention;

[0028] Figure 2 This is a schematic front view cross-sectional perspective diagram of the structure of an active hydraulic suspension system based on the EHA principle provided by the present invention;

[0029] Figure 3This is a top-down perspective diagram of the structure of an active hydraulic suspension system based on the EHA principle provided by the present invention;

[0030] Figure 4 This is a rear perspective schematic diagram of the structure of an active hydraulic suspension system based on the EHA principle provided by the present invention;

[0031] Figure 5 It is a front view cross-sectional perspective schematic diagram of the connecting structure of the suspension hydraulic cylinder and the oil delivery end of the present invention.

[0032] In the figure: 1. Suspension hydraulic cylinder; 2. Damping lifting rod body; 201. Damping block; 202. Damping rod; 203. Movable spring; 3. Rod chamber; 4. Rodless chamber; 5. Oil-feeding solenoid valve body; 501. Damping end; 6. Oil delivery end; 7. Oil circuit delivery body; 8. Gear pump; 9. Hydraulic pump; 10. Electric motor; 101. Generator; 11. Active radiator; 111. Heat dissipation fin rack; 112. Air-cooled heat dissipation fan; 12. Accumulator; 13. One-way guide pipe; 14. One-way control valve; 15. Pressure safety valve; 16. Temperature detection controller. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] like Figure 1-Figure 5 As shown, an active hydraulic suspension system based on the EHA principle includes a suspension hydraulic cylinder 1 and a damping lifting rod body 2 that slides and retracts inside the suspension hydraulic cylinder 1. The interior of the suspension hydraulic cylinder 1 is divided into a rod chamber 3 and a rodless chamber 4 by the damping portion of the damping lifting rod body 2.

[0035] The damping part of the damping lifting rod body 2 is provided with an oil-feeding electromagnetic valve body 5 connecting the rod chamber 3 and the rodless chamber 4. The outer side of the suspension hydraulic cylinder 1 is provided with two oil delivery ends 6 connecting the rod chamber 3 and the rodless chamber 4, respectively. The two oil delivery ends 6 are integrally connected to an oil conveying body 7.

[0036] One side of the oil conveying body 7 is connected to two gear pumps 8 that supply oil to the rodless chamber 4, and the other side of the oil conveying body 7 is connected to a hydraulic pump 9 that supplies oil to the rod chamber 3. The side of the hydraulic pump 9 is provided with an electric motor 10 that drives the hydraulic pump 9 to operate;

[0037] Active radiators 11 are provided on the pipelines of the oil delivery main body 7 close to the hydraulic pump 9 and the gear pump 8;

[0038] The beneficial effects to be expressed by this scheme are as follows: the interior of the suspension hydraulic cylinder 1 is divided into a rod chamber 3 and a rodless chamber 4 by the damping lifting rod body 2, and the sides of the rod chamber 3 and the rodless chamber 4 are both connected to an oil delivery end 6, and an integrally connected oil circuit delivery body 7 is provided on the two oil delivery ends 6. The oil is respectively supplied and guided by the two oil delivery ends 6. After the oil completes a cycle in the oil circuit delivery body 7, it enters the suspension hydraulic cylinder 1 again, completing the closed-cycle oil supply operation, realizing continuous oil delivery, and stably providing oil supply damping support in complex road environments;

[0039] The damping part of the damping lifting rod body 2 is provided with an oil-feeding electromagnetic valve body 5, which can assist in damping control support, facilitate suspension buffering protection in different complex ground environments, stable suspension load-bearing, and good vibration buffering protection effect. The upper and lower ends of the oil conveying body 7 are respectively provided with a gear pump 8 and a hydraulic pump 9. The gear pump 8 can continuously output oil to the rodless cavity 4, or the hydraulic pump 9 can supply oil to the rod cavity 3, so that the suspension hydraulic cylinder 1 can operate the hydraulic pump 9 or the gear pump 8 respectively according to the bump intensity and braking requirements. The operation is stable and convenient, and the oil supply damping support can be stably performed in a complex road environment.

[0040] When the gear pump 8 is running to supply oil to the rodless cavity 4, the oil in the oil circuit conveying body 7 input by the rod cavity 3 can drive the hydraulic pump 9 to drive in the opposite direction, and then drive the electric motor 10 to drive and generate electricity, completing energy conversion and recovery, which is convenient for recovering electric energy. The electric energy recovery capability can improve the energy efficiency of the actuator, and the active radiator 11 can actively conduct heat and dissipate heat of the oil temperature in the oil circuit conveying body 7 to complete rapid heat dissipation. The heat dissipation is stable and efficient, so that the device can carry out oil delivery damping for the suspension according to changes in road bumps. It has excellent motion control performance, high energy efficiency, adaptability to harsh environments, and excellent heat dissipation capability, meeting the requirements of active suspension in different environments.

[0041] Furthermore, the damping lifting rod body 2 includes a damping block 201 and a damping rod 202. The damping block 201 is slidably connected to the inner side of the suspension hydraulic cylinder 1. The damping rod 202 is fixedly mounted on the top of the damping block 201. The top of the damping block 201 extends in sequence with a rod cavity 3 and the suspension hydraulic cylinder 1.

[0042] Specifically, the damping block 201 can damp the movement inside the suspension hydraulic cylinder 1, and divide the interior of the suspension hydraulic cylinder 1 into a rod chamber 3 and a rodless chamber 4, maintaining stable damping when the damping block 201 is raised or lowered. The damping rod 202 can push the force generated by the external suspension vibration into the suspension hydraulic cylinder 1 through the damping block 201 to perform damping and buffering protection. The damping and buffering are stable, and the structure is simple and practical.

[0043] Furthermore, a movable spring 203 is sleeved on the top of the damping rod 202, and both ends of the movable spring 203 are fixedly connected to the suspension hydraulic cylinder 1 and the damping rod 202 respectively;

[0044] Specifically, a movable spring 203 is sleeved on the top of the damping rod 202. When the damping rod 202 cooperates with the damping block 201 for damping and buffering, the movable spring 203 can cooperate to provide spring buffering protection, so that the damping lifting rod body 2 as a whole has elasticity and damping buffering protection, and the buffering protection effect is good.

[0045] Furthermore, an accumulator 12 connected to the rod chamber 3 is provided on the side of the suspension hydraulic cylinder 1 away from the oil delivery end 6, and two one-way guide pipes 13 connected to the two sides of the oil delivery body 7 are provided on the side of the accumulator 12;

[0046] Specifically, the accumulator 12 is combined with two one-way guide pipes 13 and is connected in parallel with the oil circuit conveying body 7. The accumulator 12 can store and transport oil to achieve continuous oil delivery. The accumulator 12 is directly connected to the rod chamber 3, which is convenient for oil circuit delivery and circuit of the rod chamber 3. The accumulator 12 is connected to the two oil circuits of the oil circuit conveying body 7 by the one-way guide pipe 13 to achieve reliable oil suction of the hydraulic pump 9 and prevent cavitation.

[0047] Furthermore, the accumulator 12 is composed of a pressurized oil tank, and a one-way control valve 14 is fixedly installed on each of the two one-way flow guide pipes 13, and a pressure safety valve 15 is correspondingly provided on the oil conveying body 7;

[0048] Specifically, a one-way control valve 14 is provided on the one-way guide pipe 13 to prevent backflow when the oil circuit is supplied with oil. A pressure safety valve 15 is correspondingly provided on the oil circuit delivery body 7 to ensure that there is no overpressure inside the system to protect the hydraulic circuit and ensure stable operation.

[0049] Furthermore, the oil-feeding solenoid valve body 5 is an electrified valve body, and a damping end 501 is provided on the oil-feeding solenoid valve body 5 , and the damping end 501 is controlled by the oil-feeding solenoid valve body 5 to control the opening and closing damping;

[0050] Specifically, the oil-delivery type solenoid valve body 5 is an energized valve body, which can be in an energized state and a de-energized state. In the de-energized state, the damping end 501 provided on the oil-delivery type solenoid valve body 5 can perform oil circuit damping delivery, and the flow diversion is convenient and stable. The oil-delivery type solenoid valve body 5 can play the role of damping delivery and oil control delivery, and the switch control is convenient.

[0051] Furthermore, the oil delivery body 7 is connected to the rod cavity 3 and the rodless cavity 4 by the oil delivery end 6. The oil delivery body 7, the oil delivery end 6, the rod cavity 3, the rodless cavity 4 and the oil delivery solenoid valve body 5 form an oil supply cycle. The active radiator 11 is correspondingly installed at the oil delivery port of the oil delivery body 7 near the hydraulic pump 9 and the gear pump 8.

[0052] Specifically, the oil circuit conveying body 7 is connected to the rod chamber 3 and the rodless chamber 4 by the oil delivery end 6 respectively, which can form an oil circuit circulation loop. The circulating oil supply is stable, and the oil circuit circulation diversion of the suspension hydraulic cylinder 1 can be stably performed. The adaptation is stable, and when the oil circuit circulates, multiple active radiators 11 can actively dissipate the heat generated by the oil circuit, and the heat dissipation is convenient and stable.

[0053] Furthermore, a generator 101 is provided on the side of the motor 10, the motor 10 is a four-quadrant operating motor, and the hydraulic pump 9 is a bidirectional pump;

[0054] Specifically, a generator 101 is provided on the side of the motor 10. The motor 10 can drive the hydraulic pump 9 to supply oil. When the oil circuit is reversed, the dynamic hydraulic pump 9 is a bidirectional pump. When the reverse flow drives the dynamic hydraulic pump 9, it can drive the motor 10 to rotate and operate, thereby driving the motor 10 to drive the generator 101 to drive power generation, complete energy conversion and recovery, and facilitate the recovery of electrical energy. The electrical energy recovery capability can improve the energy efficiency of the actuator.

[0055] Furthermore, a temperature detection controller 16 is correspondingly provided on the oil conveying body 7, and the temperature detection controller 16 is electrically connected to the plurality of active radiators 11;

[0056] Specifically, the temperature detection controller 16 is arranged on the oil circuit conveying body 7, which can play the role of real-time oil temperature monitoring. When the oil circuit temperature in the oil circuit conveying body 7 is too high, multiple active radiators 11 can be controlled to perform active air cooling. The heat dissipation is convenient and stable, with good adaptability, which is convenient for heat dissipation protection operations.

[0057] Furthermore, the active radiator 11 includes a heat dissipation fin frame 111 and an air-cooled heat dissipation fan 112. The plurality of heat dissipation fin frames 111 are fixedly sleeved on the oil delivery port of the oil conveying body 7 near the hydraulic pump 9 and the gear pump 8, and the air-cooled heat dissipation fan 112 is fixedly installed on the outside of the heat dissipation fin frame 111.

[0058] Specifically, the heat dissipation fin frame 111 is installed on the oil circuit conveying body 7 to conduct the heat energy on the oil circuit conveying body 7 to the heat dissipation fin frame 111, and the heat dissipation operation is performed by the heat dissipation fin frame 111. Running the air-cooled heat dissipation fan 112 can perform auxiliary air cooling and heat dissipation on the heat dissipation fin frame 111. The active heat dissipation efficiency is high, so that the oil circuit temperature in the oil pipe is always kept stable, and it is not easy to overheat and damage components. In the field environment and harsh road conditions, the oil is always in a reasonable temperature range.

[0059] The operating principle of the present invention is now described as follows:

[0060] S1: A damping lifting rod body 2 is provided inside the suspension hydraulic cylinder 1, and the rod body of the damping lifting rod body 2 slides and extends out of the suspension hydraulic cylinder 1 to play a telescopic damping role, and the interior of the suspension hydraulic cylinder 1 is divided into a rod chamber 3 and a rodless chamber 4 by the damping lifting rod body 2. The rod chamber 3 and the rodless chamber 4 can respectively carry out oil supply injection and oil damping discharge, thereby achieving oil supply damping and supporting effects. When high-intensity suspension vibration and bumps occur, the rod chamber 3 and the rodless chamber 4 can respectively carry out oil supply damping and oil supply support, buffering support and protection, thereby realizing the basic elasticity and damping functions of the vehicle suspension;

[0061] S2: The damping part of the damping lifting rod body 2 is provided with an oil-feeding electromagnetic valve body 5. When the power is connected, the rod chamber 3 and the rodless chamber 4 are damped and moved, which plays a damping or opening effect. When vibration occurs, the damping lifting rod body 2 is squeezed and lifted, and the oil-feeding electromagnetic valve body 5 discharges oil or damps the oil. The oil-feeding electromagnetic valve body 5 has the ability to damp oil delivery in the power-off state, and plays an active damping role when delivering oil. The rod chamber 3 and the rodless chamber 4 both play a damping role in the up and down oil delivery, which is convenient for the normal operation of the oil. When the rod chamber 3 and the rodless chamber 4 are subjected to vibration, the oil can be stably delivered by the oil to play a damping, buffering and supporting effect. The suspension load is stable and the vibration buffering protection effect is good.

[0062] S3: The side of the suspension hydraulic cylinder 1 is provided with an oil delivery end 6 which is respectively connected to the rod chamber 3 and the rodless chamber 4. The two oil delivery ends 6 are provided with an integrally connected oil circuit delivery body 7. The oil circuit delivery body 7 can deliver oil to the rod chamber 3 respectively, and then discharge oil from the rodless chamber 4 to complete the oil delivery and oil discharge operations. The oil is respectively supplied and guided by the two oil delivery ends 6. After the oil completes a cycle in the oil circuit delivery body 7, it enters the suspension hydraulic cylinder 1 again to complete the closed-loop oil supply operation, realizing continuous delivery of the oil. It can stably provide oil damping support in complex road environments to meet the special requirements of active suspension of off-road vehicles.

[0063] S4: The oil circuit delivery body 7 is connected to two gear pumps 8 that supply oil to the rodless chamber 4. Under normal circumstances, the rodless chamber 4 can be continuously output and supply oil. The oil circuit delivery body 7 is connected to a hydraulic pump 9 that delivers oil to the rod chamber 3. The hydraulic pump 9 is driven by the motor 10 to supply oil to the rod chamber 3. Therefore, in the event of severe bumps and vibrations, the gear pump 8 can supply oil to the rodless chamber 4 and the rod chamber 3 can discharge oil to the oil circuit delivery body 7, or the hydraulic pump 9 can supply oil to the rod chamber 3 and the rodless chamber 4 can discharge oil to the oil circuit delivery body 7, respectively, to perform positive upward or reverse oil supply operations, so that the suspension hydraulic cylinder 1 can operate the hydraulic pump 9 or the gear pump 8 according to the bump intensity and braking requirements, and the operation is stable and convenient;

[0064] S5: When the gear pump 8 is running to supply oil to the rodless chamber 4, the oil in the oil passage 7 is inputted from the rod chamber 3, which can drive the hydraulic pump 9 to drive in the reverse direction, thereby driving the motor 10 to drive and generate electricity, completing energy conversion and recovery, facilitating the recovery of electric energy. The electric energy recovery capability can improve the energy efficiency of the actuator;

[0065] S6: Active radiators 11 are provided at the pipelines of the oil circuit delivery body 7 near the hydraulic pump 9 and the gear pump 8. When the hydraulic pump 9 and the gear pump 8 are running, the oil temperature will gradually rise. Due to the high working intensity, the ambient temperature may be high. Multiple sets of active radiators 11 are operated to perform active air cooling and heat dissipation at the nodes where the oil circuit rises, and close to the oil outlet end of the oil circuit delivery body 7 to complete rapid heat dissipation, stable and efficient heat dissipation, excellent adaptability, and more efficient exchange of radiator heat to the environment;

[0066] S7: The damping lifting rod body 2 includes a damping block 201 and a damping rod 202. The damping block 201 can be moved in a damping manner inside the suspension hydraulic cylinder 1, and the interior of the suspension hydraulic cylinder 1 is divided into a rod chamber 3 and a rodless chamber 4. When the damping block 201 is raised or lowered, stable damping is maintained. The damping rod 202 can push the force generated by the external suspension vibration into the suspension hydraulic cylinder 1 by the damping block 201 to perform damping and buffering protection. The damping and buffering are stable, the structure is simple and practical, and the top of the damping rod 202 is sleeved with a movable spring 203. When the damping rod 202 cooperates with the damping block 201 for damping and buffering, the movable spring 203 can cooperate with the spring buffering protection, so that the damping lifting rod body 2 as a whole has elasticity and damping and buffering protection, and the buffering protection effect is good.

[0067] S8: The accumulator 12 cooperates with two one-way guide pipes 13 and is connected in parallel with the oil circuit delivery body 7. The accumulator 12 can store and transport oil to achieve continuous oil delivery. The accumulator 12 is directly connected to the rod chamber 3, which is convenient for oil circuit delivery and circuit of the rod chamber 3. The accumulator 12 is connected to the two oil circuits of the oil circuit delivery body 7 by the one-way guide pipes 13 respectively to achieve reliable oil suction and prevent cavitation of the hydraulic pump 9. A one-way control valve 14 is provided on the one-way guide pipe 13 to prevent backflow when the oil circuit is supplied. A pressure safety valve 15 is correspondingly provided on the oil circuit delivery body 7 to ensure that there is no overpressure in the system to protect the hydraulic circuit and ensure stable operation.

[0068] S9: The oil-feeding solenoid valve body 5 is an energized valve body that can be in an energized state or a de-energized state. In the de-energized state, the damping end 501 provided on the oil-feeding solenoid valve body 5 can provide oil damping and delivery, making the flow guidance convenient and stable. The oil-feeding solenoid valve body 5 can play the role of damping and controlling oil delivery, and is easy to control on and off.

[0069] S10: The oil conveying body 7 is connected to the rod chamber 3 and the rodless chamber 4 through the oil conveying end 6, forming an oil circulation loop. The circulating oil supply is stable, and the oil circulation flow of the suspension hydraulic cylinder 1 can be stably conducted. The adaptability is stable, and when the oil circulates, multiple active radiators 11 can actively dissipate the heat generated by the oil circuit, and the heat dissipation is convenient and stable.

[0070] S11: A generator 101 is provided on the side of the motor 10. The motor 10 can drive the hydraulic pump 9 to supply oil. When reverse flow occurs in the oil circuit, the dynamic hydraulic pump 9 is a bidirectional pump. When the reverse flow drives the dynamic hydraulic pump 9, it can correspondingly drive the motor 10 to rotate and operate, thereby driving the motor 10 to drive the generator 101 to drive and generate electricity, completing energy conversion and recovery, facilitating the recovery of electrical energy. The electrical energy recovery capability can improve the energy efficiency of the actuator;

[0071] S12: The temperature detection controller 16 is provided on the oil conveying body 7, which can play a role in real-time oil temperature monitoring. When the oil temperature in the oil conveying body 7 is too high, it can control multiple active radiators 11 to perform active air cooling and heat dissipation. The heat dissipation is convenient and stable, with good adaptability, which is convenient for heat dissipation protection operations;

[0072] S13: The active radiator 11 includes a heat dissipation fin frame 111 and an air-cooling heat dissipation fan 112. The heat dissipation fin frame 111 is correspondingly installed on the oil conveying body 7 to conduct the heat energy on the oil conveying body 7 to the heat dissipation fin frame 111, and the heat dissipation operation is performed by the heat dissipation fin frame 111. The operation of the air-cooling heat dissipation fan 112 can provide auxiliary air cooling and heat dissipation on the heat dissipation fin frame 111. The active heat dissipation efficiency is high, so that the oil temperature in the oil pipe is always kept stable, and it is not easy to overheat and damage components. In the field environment and harsh road conditions, the oil is always within a reasonable temperature range;

[0073] S14: The device forms an entire oil circuit, which can transport oil and damp the two suspension chambers separately according to changes in road bumps. It has excellent motion control performance, high energy efficiency, adaptability to harsh environments, and excellent heat dissipation capacity, meeting the requirements of active suspension in different environments.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An active hydraulic suspension system based on the EHA principle, comprising a suspension hydraulic cylinder (1) and a damping lifting rod (2) that slides and retracts inside the suspension hydraulic cylinder (1), characterized in that: The interior of the suspension hydraulic cylinder (1) is divided into a rod chamber (3) and a rodless chamber (4) by the damping portion of the damping lifting rod body (2); The damping portion of the damping lifting rod body (2) is provided with an oil-feeding electromagnetic valve body (5) communicating with the rod chamber (3) and the rodless chamber (4); the outer side of the suspension hydraulic cylinder (1) is provided with two oil delivery ends (6) communicating with the rod chamber (3) and the rodless chamber (4); the two oil delivery ends (6) are integrally connected with an oil conveying body (7); One side of the oil conveying body (7) is connected to two gear pumps (8) for supplying oil to the rodless chamber (4), and the other side of the oil conveying body (7) is connected to a hydraulic pump (9) for supplying oil to the rod chamber (3). A motor (10) for driving the hydraulic pump (9) is provided on the side of the hydraulic pump (9); Active radiators (11) are provided at the pipelines of the oil conveying main body (7) close to the hydraulic pump (9) and the gear pump (8).

2. The active hydraulic suspension system based on the EHA principle according to claim 1, characterized in that: The damping lifting rod body (2) comprises a damping block (201) and a damping rod (202), wherein the damping block (201) is slidably connected to the inner side of the suspension hydraulic cylinder (1), and the damping rod (202) is fixedly mounted on the top of the damping block (201), and a rod cavity (3) and a suspension hydraulic cylinder (1) are sequentially extended from the top of the damping block (201).

3. The active hydraulic suspension system based on the EHA principle according to claim 2, characterized in that: A movable spring (203) is sleeved on the top of the damping rod (202), and two ends of the movable spring (203) are fixedly connected to the suspension hydraulic cylinder (1) and the damping rod (202) respectively.

4. The active hydraulic suspension system based on the EHA principle according to claim 1, characterized in that: An accumulator (12) connected to the rod chamber (3) is provided on the side of the suspension hydraulic cylinder (1) away from the oil delivery end (6), and two one-way flow guide pipes (13) connected to both sides of the oil delivery body (7) are provided on the side of the accumulator (12).

5. The active hydraulic suspension system based on the EHA principle according to claim 4 is characterized in that: The accumulator (12) is composed of a pressurized oil tank, and a one-way control valve (14) is fixedly installed on each of the two one-way flow guide pipes (13), and a pressure safety valve (15) is correspondingly provided on the oil conveying body (7).

6. The active hydraulic suspension system based on the EHA principle according to claim 1, characterized in that: The oil-feeding electromagnetic valve body (5) is an electrified valve body. A damping end (501) is provided on the oil-feeding electromagnetic valve body (5). The opening and closing damping of the damping end (501) is controlled by the oil-feeding electromagnetic valve body (5).

7. The active hydraulic suspension system based on the EHA principle according to claim 1, characterized in that: The oil circuit delivery body (7) is connected to the rod chamber (3) and the rodless chamber (4) through the oil delivery end (6), and the oil circuit delivery body (7), the oil delivery end (6), the rod chamber (3), the rodless chamber (4) and the oil delivery solenoid valve body (5) form an oil supply cycle. The active radiator (11) is correspondingly installed at the oil delivery port of the oil circuit delivery body (7) close to the hydraulic pump (9) and the gear pump (8).

8. The active hydraulic suspension system based on the EHA principle according to claim 1, characterized in that: A generator (101) is provided on the side of the electric motor (10). The electric motor (10) is a four-quadrant operating motor, and the hydraulic pump (9) is a bidirectional pump.

9. The active hydraulic suspension system based on the EHA principle according to claim 1, characterized in that: A temperature detection controller (16) is correspondingly provided on the oil conveying body (7), and the temperature detection controller (16) is electrically connected to the plurality of active radiators (11).

10. The active hydraulic suspension system based on the EHA principle according to claim 1, characterized in that: The active radiator (11) comprises a heat dissipation fin frame (111) and an air-cooled heat dissipation fan (112), wherein a plurality of the heat dissipation fin frames (111) are fixedly sleeved on the oil delivery main body (7) near the oil delivery port of the hydraulic pump (9) and the gear pump (8), and the air-cooled heat dissipation fan (112) is fixedly installed on the outside of the heat dissipation fin frame (111).

Images