Vehicle suspension system based on alternating-current hydraulic pressure

Abstract

The invention relates to a vehicle suspension system based on alternating-current hydraulic pressure, which comprises a vibration reduction system and an oil recharging system, the vibration reduction system comprises hydraulic cylinders, a balance valve and an overflow valve, and the hydraulic cylinders are connected with a vehicle body and are divided into an upper hydraulic cylinder and a lower hydraulic cylinder; the two hydraulic cylinders are symmetrically arranged on the upper side and the lower side of the wheel respectively. Piston rods of the hydraulic cylinders are connected with the wheel through piston rod connecting pieces. The oil supplementing system comprises a first hydraulic pump, a first electromagnetic switch valve, a first three-position four-way electromagnetic reversing valve and a first energy accumulator, one connector of the other end of the first three-position four-way electromagnetic reversing valve is grounded, and the other connector of the other end of the first three-position four-way electromagnetic reversing valve is connected with one end of the first electromagnetic switch valve and the first energy accumulator. The other end of the first electromagnetic switch valve is connected with a third overflow valve and a first hydraulic pump through a second one-way valve. The alternating-current hydraulic system is applied to the vehicle suspension system, the unique advantages of the alternating-current hydraulic system are brought into full play, and part of defects of an existing active suspension system are effectively overcome.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle suspension, and in particular to a vehicle suspension system based on AC hydraulics. Background Art

[0002] The vehicle suspension system is the general term for all components that connect the vehicle body and the moving parts. It not only elastically connects the vehicle body and the moving parts, but more importantly, it reduces and attenuates the dynamic load generated on the part above the vehicle body when the vehicle is driving on uneven roads, so as to reduce bumps and vibrations and ensure the smooth driving of the vehicle.

[0003] Vehicle suspension is divided into passive suspension and active suspension. Active suspension means that the stiffness and damping characteristics can be dynamically and adaptively adjusted according to the driving conditions of the vehicle, so that the suspension system is always in the best vibration reduction state. Compared with passive suspension, the active system can significantly improve the ride comfort and handling stability of the vehicle. However, the addition of active suspension system also corresponds to the need to install complex hydraulic pipelines, controllers, sensors and other additional structures, which will not only affect the space layout of the vehicle, increase the volume and weight of the vehicle, but also lead to higher costs, increased energy consumption and reduced reliability of the suspension part. In addition, many factors such as the strong nonlinearity of the suspension system, the uncertainty of the control system, and the rapidity of the control process also limit the application of active suspension.

[0004] AC hydraulic system refers to a system that uses fluid as a medium, purposefully controls the generation of hydraulic vibration, and transmits energy or signals by fluctuating flow or fluctuating pressure. It not only has the advantages similar to DC hydraulic technology, such as small size, light weight, self-lubrication, self-cooling, large unit power, wide speed regulation range, and long service life, but also has unique advantages such as simple structure, high synchronization, easy troubleshooting, convenient adjustment, and can be used in extreme environments. However, at present, AC hydraulic systems are mainly used in mechanical fields such as metallurgical equipment, vibration test benches, AC hydraulic hammers, and filter presses, and are rarely used in vehicle suspension systems.

[0005] In addition, the efficiency of the AC hydraulic system is affected by many factors such as load impedance and AC frequency. An AC hydraulic system with excellent design and simple structure may still have certain advantages in efficiency, but if complex structures such as AC valves and rectifiers are added, its efficiency may be much lower than the corresponding DC system; in terms of component performance and sealing, since the pipelines of the AC hydraulic system generally need to withstand high-pressure pulse pressure, this not only puts forward higher sealing requirements for the hydraulic system, but also requires important components such as hoses to have better service strength and life; in terms of heat dissipation and cooling, since the oil in the AC hydraulic system does not flow or flows back and forth in the pipeline, additional heat dissipation and cooling must be adopted. Summary of the invention

[0006] The present invention aims to provide a vehicle suspension system based on AC hydraulics, which applies the AC hydraulic system to the vehicle suspension system, gives full play to the unique advantages of the AC hydraulic system, and effectively solves some defects of the current active suspension system. The active suspension system has a simple structure, low cost, light weight and small size, reliable and durable operation, and is easy to maintain.

[0007] An AC hydraulic valve-controlled passive suspension system, the passive suspension system includes a vibration reduction system and an oil replenishment system, wherein the vibration reduction system includes a hydraulic cylinder and a balancing valve, the hydraulic cylinder is connected to the vehicle body through a cylinder body connecting piece, the hydraulic cylinder is divided into an upper hydraulic cylinder and a lower hydraulic cylinder, the upper hydraulic cylinder and the lower hydraulic cylinder are symmetrically arranged on the upper and lower sides of the wheel respectively, and the piston rods of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to the wheel through a piston rod connecting piece, the lower end of the upper hydraulic cylinder is connected to the upper end of the lower hydraulic cylinder through a first circuit, a first balancing valve is arranged in the first circuit, the upper end of the upper hydraulic cylinder and the lower end of the lower hydraulic cylinder are connected through a second circuit, a A second balancing valve is provided, and the oil replenishing system includes a first hydraulic pump, a first electromagnetic switch valve, a first three-position four-way electromagnetic reversing valve, and a first accumulator. The lower ends of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to an interface of the first three-position four-way electromagnetic reversing valve through a first one-way valve, and the upper ends of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to another interface of the same end of the first three-position four-way electromagnetic reversing valve through the first one-way valve. One interface at the other end of the first three-position four-way electromagnetic reversing valve is grounded, and the other interface is connected to one end of the first electromagnetic switch valve and the first accumulator. The other end of the first electromagnetic switch valve is respectively connected to the third overflow valve and the first hydraulic pump through the second one-way valve.

[0008] Preferably, a throttle valve is provided in both the first circuit and the second circuit.

[0009] Preferably, a first overflow valve is provided in the first circuit, and a second overflow valve is provided in the second circuit.

[0010] An AC hydraulic valve-controlled active suspension system comprises a valve-controlled active control system and a passive suspension system, wherein the passive suspension system comprises a vibration reduction system and an oil replenishment system, the vibration reduction system comprises a hydraulic cylinder, a balancing valve, and a relief valve, the hydraulic cylinder is connected to a vehicle body through a cylinder body connector, the hydraulic cylinder is divided into an upper hydraulic cylinder and a lower hydraulic cylinder, the upper hydraulic cylinder and the lower hydraulic cylinder are symmetrically arranged on the upper and lower sides of the wheel respectively, and the piston rods of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to the wheel through a piston rod connector, the lower end of the upper hydraulic cylinder is connected to the upper end of the lower hydraulic cylinder through a first circuit, a first balancing valve and a first relief valve are arranged in the first circuit, the upper end of the upper hydraulic cylinder and the lower end of the lower hydraulic cylinder are connected through a second circuit, a second balancing valve and a second relief valve are arranged in the second circuit, a throttle valve is arranged in both the first circuit and the second circuit, the oil replenishment system comprises a first hydraulic pump, a first electromagnetic switch valve, a first three-position four-way electromagnetic reversing valve, and a first accumulator, the lower ends of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to one end of the first three-position four-way electromagnetic reversing valve through a first one-way valve An interface, the upper ends of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to another interface at the same end of the first three-position four-way electromagnetic reversing valve through a first one-way valve, an interface at the other end of the first three-position four-way electromagnetic reversing valve is grounded, and another interface is connected to one end of the first electromagnetic switch valve and the first accumulator, and the other end of the first electromagnetic switch valve is respectively connected to the third overflow valve and the first hydraulic pump through a second one-way valve. The valve-controlled active control system includes a first central processor, a second electromagnetic switch valve, a second three-position four-way electromagnetic reversing valve, a second hydraulic pump, and a fourth overflow valve. An interface at one end of the second electromagnetic switch valve is connected to the upper end of the upper hydraulic cylinder, another interface is connected to the lower end of the lower hydraulic cylinder, and the other end is connected to one end of the second three-position four-way electromagnetic reversing valve. An interface at the other end of the second three-position four-way electromagnetic reversing valve is grounded, and another interface is respectively connected to the fourth overflow valve and the second hydraulic pump. The first central processor obtains the displacement signal of the wheel through the displacement sensor, and the first central processor analyzes and calculates the signal and feeds it back to the second three-position four-way electromagnetic reversing valve and controls it.

[0011] Preferably, an adjustable flow valve is further provided between the second electromagnetic switch valve and the hydraulic cylinder.

[0012] An AC hydraulic single-pump active suspension system includes a single-pump active control system and a passive suspension system, wherein the passive suspension system includes a vibration reduction system and an oil replenishment system, the vibration reduction system includes a hydraulic cylinder, a balancing valve, and a relief valve, the hydraulic cylinder is connected to the vehicle body through a cylinder body connector, the hydraulic cylinder is divided into an upper hydraulic cylinder and a lower hydraulic cylinder, the upper hydraulic cylinder and the lower hydraulic cylinder are symmetrically arranged on the upper and lower sides of the wheel respectively, and the piston rods of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to the wheel through a piston rod connector, the lower end of the upper hydraulic cylinder is connected to the upper end of the lower hydraulic cylinder through a first circuit, a first balancing valve and a first relief valve are arranged in the first circuit, the upper end of the upper hydraulic cylinder and the lower end of the lower hydraulic cylinder are connected through a second circuit, a second balancing valve and a second relief valve are arranged in the second circuit, a throttle valve is arranged in both the first circuit and the second circuit, the oil replenishment system includes a first hydraulic pump, a first electromagnetic switch valve, a first three-position four-way electromagnetic reversing valve, and a first accumulator, the lower ends of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to the first three-position four-way electromagnetic reversing valve through a first one-way valve The single pump control active control system comprises a driver, a second central processing unit, a servo motor, a double-acting hydraulic pump, a second accumulator, a fifth overflow valve, a sixth overflow valve, and two third electromagnetic switch valves. The two third electromagnetic switch valves are respectively connected to the upper end of the upper hydraulic cylinder and the lower end of the lower hydraulic cylinder. The fifth overflow valve, the sixth overflow valve, and the second accumulator are connected in parallel between the two third electromagnetic switch valves and connected to one end of the double-acting hydraulic pump. The other end of the double-acting hydraulic pump is connected to the driver through a servo motor. The second central processing unit obtains the displacement signal of the wheel through a displacement sensor, and the second central processing unit analyzes and calculates the signal and feeds it back to the driver to control the double-acting hydraulic pump.

[0013] Preferably, a third one-way valve is further provided at both ends of the second accumulator.

[0014] Preferably, a one-way throttle valve is arranged between the two third electromagnetic switch valves and the double-acting hydraulic pump.

[0015] An AC hydraulic dual-pump active suspension system includes a dual-pump active control system and a passive suspension system, wherein the passive suspension system includes a vibration reduction system and an oil replenishment system, the vibration reduction system includes a hydraulic cylinder, a balancing valve, and an overflow valve, the hydraulic cylinder is connected to the vehicle body through a cylinder body connector, the hydraulic cylinder is divided into an upper hydraulic cylinder and a lower hydraulic cylinder, the upper hydraulic cylinder and the lower hydraulic cylinder are symmetrically arranged on the upper and lower sides of the wheel, and the piston rods of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to the wheel through a piston rod connector, the lower end of the upper hydraulic cylinder is connected to the upper end of the lower hydraulic cylinder through a first circuit, and a first balancing valve and a first overflow valve are arranged in the first circuit The hydraulic cylinder 20 has a plurality of control valves, each of which is connected to the hydraulic cylinder 20 by a plurality of control valves, and the control valve 20 has a plurality of control valves. The control valve 20 has a plurality of control valves, each of which is connected to the hydraulic cylinder 20 by a plurality of control valves. The control valve 20 has a plurality of control valves, each of which is connected to the hydraulic cylinder 20 by a plurality of control valves. The control valve 20 has a plurality of control valves, each of which is connected to the hydraulic cylinder 20 by a plurality of control valves. One interface at the other end of the one-way valve is grounded, and the other interface is connected to one end of the first electromagnetic switch valve and the first accumulator. The other end of the first electromagnetic switch valve is connected to the third relief valve and the first hydraulic pump respectively through the second one-way valve. The dual-pump control active control system includes two single-pump control active control systems, and the single-pump control active control system includes a driver, a servo motor, a double-acting hydraulic pump, a second accumulator, a fifth relief valve, a sixth relief valve, and two third electromagnetic switch valves. The fifth relief valve, the sixth relief valve, and the second accumulator are connected in parallel between the two third electromagnetic switch valves and connected to one end of the double-acting hydraulic pump. Both ends of the second accumulator are provided with There is a third one-way valve, and a one-way throttle valve is arranged between the two third solenoid switch valves and the double-acting hydraulic pump. The other end of the double-acting hydraulic pump is connected to the driver through a servo motor. The two third solenoid switch valves of one single-pump active control system are respectively connected to the upper and lower ends of the upper hydraulic cylinder, and the two third solenoid switch valves of the other single-pump active control system are respectively connected to the upper and lower ends of the lower hydraulic cylinder. The second central processing unit obtains the displacement signal of the wheel through the displacement sensor, and the second central processing unit analyzes and calculates the signal and feeds it back to the drivers of the two single-pump active control systems to control the two double-acting hydraulic pumps respectively.

[0016] The vehicle suspension system based on AC hydraulic pressure of the present invention has the following beneficial effects: 1. Two sets of upper and lower hydraulic cylinders are used for vehicle system vibration reduction. The piston rods of the two hydraulic cylinders are connected to the wheels, and the cylinder bodies of the hydraulic cylinders are connected to the vehicle body to facilitate the fixation of the hydraulic cylinders.

[0017] 2. The passive suspension and active suspension work relatively independently. The passive suspension achieves vibration reduction through the damping of oil flow. The active suspension actively controls the extension and contraction and actuation force of the upper and lower hydraulic cylinders on the basis of the passive suspension to optimize the vibration reduction performance, and can realize active and passive switching.

[0018] 3. Design active suspension based on passive suspension, and design valve-controlled and pump-controlled active control loops at the same time, applying different principles to realize active suspension function.

[0019] 4. In the single-pump-controlled active suspension system, a single servo motor and a double-acting hydraulic pump are used to form a servo motor pump unit. The two output ports of the hydraulic pump are respectively connected to the outer chambers of the upper and lower hydraulic cylinders to achieve active control.

[0020] 5. In the dual-pump controlled active suspension system, two sets of servo motors and double-acting hydraulic pumps are used to connect the two output ports of the upper and lower double-acting hydraulic pumps to the inner and outer cavities of the upper and lower hydraulic cylinders respectively to achieve active and separate control.

[0021] 6. In the single-pump controlled active suspension system and the dual-pump controlled active suspension system, an adjustable one-way throttle valve and an electromagnetic reversing valve are designed between the output port of the hydraulic pump and the hydraulic cylinder cavity. The flow rate and flow velocity of the oil flowing from the active control circuit to the passive suspension system circuit can be affected in one direction by adjusting the opening size of the single-phase throttle valve. The electromagnetic reversing valve is used to control the active and passive switching of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the vehicle active suspension of the present invention; Figure 2 It is a schematic diagram of the AC hydraulic valve-controlled passive suspension system; Figure 3 It is a schematic diagram of the AC hydraulic valve-controlled active suspension system; Figure 4 It is a schematic diagram of the AC hydraulic single pump controlled active suspension system; Figure 5 Schematic diagram of the AC hydraulic dual-pump controlled active suspension system.

[0023] Explanation of the reference numerals: 1, vehicle body; 2, upper hydraulic cylinder; 3, lower hydraulic cylinder; 4, wheel; 5, first balancing valve; 6, second balancing valve; 7, first overflow valve; 8, second overflow valve; 9, third overflow valve; 10, throttle valve; 11, first non-return valve; 12, second non-return valve; 13, first hydraulic pump; 14, first electromagnetic switch valve; 15, first three-position four-way electromagnetic reversing valve; 16, first accumulator; 17, second hydraulic pump; 18, second three-position four-way electromagnetic reversing valve Valve; 19, second electromagnetic switch valve; 20, adjustable flow valve; 21, one-way throttle valve; 22, third electromagnetic switch valve; 23, fifth overflow valve; 24, sixth overflow valve; 25, second central processing unit; 26, driver; 27, fourth overflow valve; 29, third one-way valve; 30, second accumulator; 31, first central processing unit; 32, double-acting hydraulic pump; 33, servo motor; 100, cylinder connecting plate; 200, piston rod connecting piece; 300, balance elbow. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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 part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] like Figure 1 As shown, the hydraulic cylinder is divided into two parts, the lower hydraulic cylinder 3 and the upper hydraulic cylinder 2, the cylinder bodies of the lower hydraulic cylinder 3 and the upper hydraulic cylinder 2 are fixedly connected via a cylinder body connecting plate 100 connected to the vehicle body 1; the piston rods of the lower hydraulic cylinder 3 and the upper hydraulic cylinder 2 are connected to the balance elbow 300 of the wheel (road wheel) 4 via a piston rod connecting piece 200.

[0032] Example 1 like Figure 2 As shown, the figure shows an AC hydraulic valve-controlled passive suspension system, which includes a vibration reduction system and an oil replenishment system, wherein the vibration reduction system includes a hydraulic cylinder and a balancing valve, the hydraulic cylinder is connected to the vehicle body through a cylinder body connector, the hydraulic cylinder is divided into an upper hydraulic cylinder 2 and a lower hydraulic cylinder 3, the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are symmetrically arranged on the upper and lower sides of the wheel 4, and the piston rods of the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are connected to the wheel 4 through a piston rod connector, the lower end of the upper hydraulic cylinder 2 is connected to the upper end of the lower hydraulic cylinder 3 through a first circuit, a first balancing valve 5 is arranged in the first circuit, the upper end of the upper hydraulic cylinder 2 and the lower end of the lower hydraulic cylinder 3 are connected through a second circuit, a second balancing valve 5 is arranged in the second circuit 6. The oil replenishing system includes a first hydraulic pump 13, a first electromagnetic switch valve 14, a first three-position four-way electromagnetic reversing valve 15, and a first accumulator 16. The lower ends of the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are connected to an interface of the first three-position four-way electromagnetic reversing valve 15 through a first one-way valve 11, and the upper ends of the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are connected to another interface of the same end of the first three-position four-way electromagnetic reversing valve 15 through the first one-way valve 11. One interface of the other end of the first three-position four-way electromagnetic reversing valve 15 is grounded, and the other interface is connected to one end of the first electromagnetic switch valve 14 and the first accumulator 16. The other end of the first electromagnetic switch valve 14 is connected to the third overflow valve 9 and the first hydraulic pump 13 respectively through the second one-way valve 12.

[0033] Furthermore, a throttle valve 10 is provided in both the first circuit and the second circuit.

[0034] Furthermore, a first overflow valve 7 is provided in the first circuit, and a second overflow valve 8 is provided in the second circuit.

[0035] In the vibration reduction system, the piston rods of the two hydraulic cylinders are connected to the wheels to jointly bear the road vibration caused by the road surface. When vibration occurs, if the wheel moves downward vertically, the rigidly connected vehicle body and hydraulic cylinder body will remain stationary for a moment due to inertia at the beginning, and produce relative movement with the piston rod connected to the wheel. The volume of each chamber of the hydraulic cylinder changes, and the pressure also changes accordingly, resulting in a pressure difference that causes the balance valve to open, and the oil begins to flow back and forth in the hydraulic cylinder cavity and the pipeline. The oil in the outer cavity of the lower hydraulic cylinder 3 flows into the inner cavity of the upper hydraulic cylinder 2, and the oil in the inner cavity of the upper hydraulic cylinder 2 flows into the outer cavity of the lower hydraulic cylinder 3. By the throttling resistance and damping effect of the throttle valve 10 and the pipeline, the relationship between the descending distance of the vehicle body connected to the cylinder body and the descending distance of the wheel connected to the piston rod is: when the wheel vibrates upward, the oil flows in the opposite direction, but the upward displacement of the vehicle body is also less than the upward displacement of the wheel. In this periodic cyclic vibration, the damping force generated by the flow of oil reduces the vibration acceleration and displacement transmitted to the vehicle body by the wheel, thereby playing a vibration reduction role. The balance valve can provide the hydraulic system with a pressure difference that supports the entire vehicle structure. The overflow valve serves as a protection valve for the vibration reduction system circuit. When the system is overloaded, the overflow valve opens to protect the hydraulic system from overload.

[0036] In the oil replenishment system circuit, under normal circumstances, the first accumulator 16 can be used to maintain the system pressure and replenish oil for the vibration reduction system circuit. The first three-position four-way electromagnetic reversing valve 15 is used to adjust the pressure of the hydraulic system and replenish oil. When the pressure of the first accumulator 16 does not reach the oil replenishment pressure, the first electromagnetic switch valve 14 is opened, and the first hydraulic pump 13 replenishes oil to the vibration reduction system circuit and replenishes the charging pressure for the first accumulator. The third overflow valve 9 is used to control the outlet pressure of the hydraulic pump. The one-way valves are used to control the one-way flow of oil to prevent oil backflow from affecting the normal operation of the system.

[0037] Example 2 like Figure 3As shown, the figure shows an AC hydraulic valve-controlled active suspension system. It includes a valve-controlled active control system and a passive suspension system, wherein the passive suspension system includes a damping system and an oil replenishment system, the damping system includes a hydraulic cylinder, a balancing valve, and an overflow valve, the hydraulic cylinder is connected to the vehicle body through a cylinder body connector, the hydraulic cylinder is divided into an upper hydraulic cylinder 2 and a lower hydraulic cylinder 3, the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are symmetrically arranged on the upper and lower sides of the wheel 4, and the piston rods of the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are connected to the wheel 4 through a piston rod connector, the lower end of the upper hydraulic cylinder 2 is connected to the upper end of the lower hydraulic cylinder 3 through a first circuit, and a first balancing valve is arranged in the first circuit. The upper end of the upper hydraulic cylinder 2 and the lower end of the lower hydraulic cylinder 3 are connected through a second circuit, and a second balancing valve 6 and a second overflow valve 8 are provided in the second circuit. A throttle valve 10 is provided in both the first circuit and the second circuit. The oil replenishment system includes a first hydraulic pump 13, a first electromagnetic switch valve 14, a first three-position four-way electromagnetic reversing valve 15, and a first accumulator 16. The lower ends of the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are connected to an interface of the first three-position four-way electromagnetic reversing valve 15 through a first check valve 11, and the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are connected to an interface of the first three-position four-way electromagnetic reversing valve 15 through a first check valve 11. The upper end of the cylinder 3 is connected to another interface at the same end of the first three-position four-way electromagnetic reversing valve 15 through the first one-way valve 11, one interface at the other end of the first three-position four-way electromagnetic reversing valve 15 is grounded, and the other interface is connected to one end of the first electromagnetic switch valve 14 and the first accumulator 16, and the other end of the first electromagnetic switch valve 14 is connected to the third overflow valve 9 and the first hydraulic pump 13 respectively through the second one-way valve 12. The valve-controlled active control system includes a first central processor 31, a second electromagnetic switch valve 19, a second three-position four-way electromagnetic reversing valve 18, a second hydraulic pump 17, and a fourth overflow valve 27, one end of the second solenoid switch valve 19 has an interface connected to the upper end of the upper hydraulic cylinder 2, another interface connected to the lower end of the lower hydraulic cylinder 3, and the other end is connected to one end of the second three-position four-way solenoid reversing valve 18, one interface at the other end of the second three-position four-way solenoid reversing valve 18 is grounded, and the other interface is respectively connected to the fourth overflow valve 27 and the second hydraulic pump 17, the first central processing unit 31 obtains the displacement signal of the wheel through the displacement sensor, and the first central processing unit 31 analyzes and calculates the signal and feeds it back to the second three-position four-way solenoid reversing valve 18 and controls it.

[0038] Furthermore, an adjustable flow valve 20 is provided between the second electromagnetic switch valve 19 and the hydraulic cylinder.

[0039] The working principle of the valve-controlled active control system loop is to obtain the displacement signal of the wheel through the displacement sensor, transmit it to the first central processor 31, and then the controller preset therein analyzes and solves the signal, and feedback controls the second three-position four-way electromagnetic reversing valve 18, affecting the oil replenishment and pressurization of the passive suspension system by the active control system loop, and then controls the extension and contraction of the hydraulic cylinder, provides actuating force for the suspension system, offsets or attenuates the vibration of the vehicle body, and realizes closed-loop feedback control. The function of the adjustable flow valve 20 is mainly to affect the flow rate and flow rate of the flowing oil between the two circuits by adjusting its opening size.

[0040] In addition, the reversing valve in the circuit is used to control the switching of the active and passive suspension systems. When it is closed, the active control system is disconnected from the passive suspension system, the active control part no longer works, and the system switches to the passive suspension. The purpose of the dual-mode switching design is mainly to enhance the reliability of the suspension system and save on-board energy. First of all, an important reason why the active suspension system is difficult to apply at present is the low reliability. This system can ensure that the vehicle can maintain the basic vibration reduction performance of the passive suspension system when the active control module is damaged and fails; secondly, when the vehicle is driving on a relatively flat road and does not need higher suspension performance, the active control module can also be actively turned off and switched to the passive suspension system, which can not only save the extra energy consumed by the active control system, but also reduce the inevitable damage to the hydraulic system during use.

[0041] Example 3 like Figure 4As shown, the figure shows an AC hydraulic single pump active suspension system. It includes a single pump active control system and a passive suspension system, wherein the passive suspension system includes a vibration reduction system and an oil replenishment system, the vibration reduction system includes a hydraulic cylinder, a balance valve, and an overflow valve, the hydraulic cylinder is connected to the vehicle body through a cylinder body connector, the hydraulic cylinder is divided into an upper hydraulic cylinder 2 and a lower hydraulic cylinder 3, the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are symmetrically arranged on the upper and lower sides of the wheel, and the piston rods of the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are connected to the wheel 4 through a piston rod connector, the lower end of the upper hydraulic cylinder 2 is connected to the upper end of the lower hydraulic cylinder 3 through a first circuit, and a first balance valve 5 is arranged in the first circuit. and a first overflow valve 7, the upper end of the upper hydraulic cylinder 2 and the lower end of the lower hydraulic cylinder 3 are connected through a second circuit, a second balancing valve 6 and a second overflow valve 8 are provided in the second circuit, a throttle valve 10 is provided in both the first circuit and the second circuit, the oil replenishment system includes a first hydraulic pump 13, a first electromagnetic switch valve 14, a first three-position four-way electromagnetic reversing valve 15, and a first accumulator 16, the lower ends of the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are connected to an interface of the first three-position four-way electromagnetic reversing valve 15 through a first check valve 11, and the upper ends of the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are connected to an interface of the first three-position four-way electromagnetic reversing valve 15 through a first check valve 11. The first three-position four-way solenoid reversing valve 15 is connected to another interface at the same end through the first one-way valve 11, one interface at the other end of the first three-position four-way solenoid reversing valve 15 is grounded, and the other interface is connected to one end of the first solenoid switch valve 14 and the first accumulator 16, and the other end of the first solenoid switch valve 14 is respectively connected to the third overflow valve 9 and the first hydraulic pump 13 through the second one-way valve 12. The single pump control active control system includes a driver 26, a second central processor 25, a servo motor 33, a double-acting hydraulic pump 32, a second accumulator 30, a fifth overflow valve 23, and a sixth overflow valve 24. , two third electromagnetic switch valves 22, the two third electromagnetic switch valves 22 are respectively connected to the upper end of the upper hydraulic cylinder 2 and the lower end of the lower hydraulic cylinder 3, the fifth overflow valve 23, the sixth overflow valve 24, and the second accumulator 30 are connected in parallel between the two third electromagnetic switch valves 22 and connected to one end of the double-acting hydraulic pump 32, the other end of the double-acting hydraulic pump 32 is connected to the driver 26 through the servo motor 33, the second central processor 25 obtains the displacement signal of the wheel through the displacement sensor, and the second central processor 25 analyzes and calculates the signal and feeds it back to the driver 26 to control the double-acting hydraulic pump 32.

[0042] Furthermore, third one-way valves 29 are provided at both ends of the second accumulator 30 .

[0043] Furthermore, a one-way throttle valve 21 is provided between the two third electromagnetic switch valves 22 and the double-acting hydraulic pump 32 .

[0044] In this embodiment, a single set of servo motor and double-acting hydraulic pump is used to form a servo motor pump unit, and the two output ports of the hydraulic pump are respectively connected to the outer chambers of the upper and lower hydraulic cylinders. Finally, a single pump-controlled active suspension hydraulic system is designed, which is mainly composed of a single pump-controlled active control system loop and a passive suspension system loop. The working principle of the single pump-controlled active control system loop is to obtain the displacement signal of the wheel through the displacement sensor, and indirectly control the speed of the double-acting hydraulic pump 32 through the servo motor 33, thereby affecting its flow rate, as well as the oil replenishment of the passive suspension system by the active control system loop, control the extension and contraction of the double-acting hydraulic cylinder, provide actuating force for the suspension system, offset or attenuate the vibration of the vehicle body, and realize closed-loop feedback control. As in the EHA mechanism, the second accumulator 30 and the third one-way valve 29 are also used to prevent cavitation and compensate for the oil flow difference between the two chambers of the hydraulic cylinder. The fifth relief valve 23 and the sixth relief valve 24 are used as pressure limiting valves to prevent excessive oil pressure from accumulating in the pump. The function of the one-way throttle valve 21 is mainly to unidirectionally affect the flow rate and flow rate of the oil flowing from the active control circuit to the passive suspension system circuit by adjusting its opening size. The two electromagnetic switch valves in the circuit are also used to control the switching of the active and passive suspension systems, enhance the reliability of the suspension system and save vehicle energy.

[0045] Example 4 like Figure 5As shown, the figure shows an AC hydraulic dual-pump active suspension system. It includes a dual-pump active control system and a passive suspension system, wherein the passive suspension system includes a vibration reduction system and an oil replenishment system, the vibration reduction system includes a hydraulic cylinder, a balancing valve, and an overflow valve, the hydraulic cylinder is connected to the vehicle body through a cylinder body connector, the hydraulic cylinder is divided into an upper hydraulic cylinder 2 and a lower hydraulic cylinder 3, the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are symmetrically arranged on the upper and lower sides of the wheel 4, and the piston rods of the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are connected to the wheel 4 through a piston rod connector, the lower end of the upper hydraulic cylinder 2 is connected to the upper end of the lower hydraulic cylinder 3 through a first circuit, the first circuit is provided with a first balancing valve 5 and a first overflow valve 7, the upper end of the upper hydraulic cylinder 2 and the lower end of the lower hydraulic cylinder 3 are connected through a second circuit The second circuit is provided with a second balancing valve 6 and a second overflow valve 8, and the first circuit and the second circuit are both provided with a throttle valve 10. The oil replenishment system includes a first hydraulic pump 13, a first electromagnetic switch valve 14, a first three-position four-way electromagnetic reversing valve 15, and a first accumulator 16. The lower ends of the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are connected to an interface of the first three-position four-way electromagnetic reversing valve 15 through a first one-way valve 11, and the upper ends of the upper hydraulic cylinder 2 and the lower hydraulic cylinder 3 are connected to another interface of the same end of the first three-position four-way electromagnetic reversing valve 15 through the first one-way valve 11. One interface of the other end of the first three-position four-way electromagnetic reversing valve 15 is grounded, and the other interface is connected to the first One end of the electromagnetic switch valve 14 is connected to the first accumulator 16, and the other end of the first electromagnetic switch valve 14 is connected to the third relief valve 9 and the first hydraulic pump 13 respectively through the second one-way valve 12. The dual-pump control active control system includes two single-pump control active control systems, and the single-pump control active control system includes a driver 26, a servo motor 33, a double-acting hydraulic pump 32, a second accumulator 30, a fifth relief valve 23, a sixth relief valve 24, and two third electromagnetic switch valves 22. The fifth relief valve 23, the sixth relief valve 24, and the second accumulator 30 are connected in parallel between the two third electromagnetic switch valves 22 and connected to one end of the double-acting hydraulic pump 32. The second accumulator 30 is provided with a third one-way valve at both ends. 29. A one-way throttle valve 21 is arranged between the two third electromagnetic switch valves 22 and the double-acting hydraulic pump 32. The other end of the double-acting hydraulic pump 32 is connected to the driver 26 through a servo motor 33. The two third electromagnetic switch valves 22 of one single pump control active control system are respectively connected to the upper and lower ends of the upper hydraulic cylinder 2, and the two third electromagnetic switch valves 22 of the other single pump control active control system are respectively connected to the upper and lower ends of the lower hydraulic cylinder 3. The second central processor 25 obtains the displacement signal of the wheel through the displacement sensor, and the second central processor 25 analyzes and calculates the signal and feeds it back to the drivers 26 of the two single pump control active control systems to control the two double-acting hydraulic pumps 32 respectively.

[0046] In this embodiment, the difference from the single pump control is that two sets of servo motors and double-acting hydraulic pumps are used, and the two output ports of the upper and lower double-acting hydraulic pumps are respectively connected to the inner and outer cavities of the upper and lower hydraulic cylinders. Finally, a dual-pump-controlled active suspension hydraulic system is designed, which is mainly composed of a dual-pump-controlled active control system loop and a passive suspension system loop, wherein the structure and function of the passive suspension system loop are also the same as before. The working principle of the dual-pump active control system loop is basically the same as that of the single-pump-controlled active control. The core change of the dual-pump active suspension is that the central processor controls two sets of servo motors and hydraulic pump systems at the same time, respectively controlling the extension and retraction of the upper and lower hydraulic cylinders. The functions of hydraulic components such as accumulators, one-way valves, overflow valves, one-way throttle valves, and reversing valves in the hydraulic circuit in the hydraulic system are also basically the same as those in the single-pump-controlled active suspension system, and will not be repeated here. Here, the central processor will give the driver the same control signal, and then control the pressure and flow of the double-acting hydraulic pump 32 through the servo motor 33 to keep it consistent. Then, the hydraulic circuit will give the plunger rods connected to the two hydraulic cylinders a force in the same direction. From the perspective of the two hydraulic cylinders as hydraulic actuators, the forces of the hydraulic actuators are superimposed in the same direction, which can maximize the advantages of the dual-pump active suspension.

[0047] In the specific analysis process of the invention effect, the suspension system is comprehensively analyzed with the suspension travel as the constraint condition and the ride comfort and handling stability as the optimization target, and the ride comfort, handling stability and suspension travel are evaluated specifically with the body vibration acceleration, the deformation of the road wheel and the suspension dynamic deflection. Considering that the applicable target of the AC hydraulic suspension system designed by the present invention is mainly heavy vehicles, the theoretical maximum speed of heavy vehicles is 75km / h as an example, and its average highway speed is about 60%~70% of the theoretical maximum speed, and the average off-road speed is about 30%~40% of the theoretical maximum speed. The simulation conditions are finally determined to be: 54km / h on C-class road surface and 27km / h on E-class road surface.

[0048] Based on AMESim software, the AC hydraulic passive suspension system was modeled and simulated. The final simulation results show that compared with the single-wheel torsion bar suspension, the AC hydraulic passive suspension reduces the vehicle body vibration acceleration, road wheel deformation, and suspension dynamic deflection by 26.17%, 4.46%, and 0.26% respectively on C-class road conditions at 54km / h, and by 43.77%, 15.50%, and 11.15% respectively on E-class road conditions at 27km / h, with obvious optimization effects. The feasibility of the AC hydraulic passive suspension system as a vehicle suspension system is verified.

[0049] The AMESim modeling and simulation comparison of AC hydraulic valve-controlled active suspension found that under C-level and E-level road conditions, AC hydraulic valve-controlled active suspension showed better performance than AC hydraulic passive suspension in terms of body acceleration and suspension dynamic deflection. However, in terms of road wheel deformation, under E-level road conditions, valve-controlled active suspension also has obvious improvement over passive suspension, but it is slightly inferior to passive suspension under C-level road conditions, but the difference is very small.

[0050] The AMESim modeling and simulation comparison of the AC hydraulic single-pump active suspension found that whether on C-class or E-class roads, the AC hydraulic single-pump active suspension has improved in terms of body acceleration, road wheel deformation and suspension dynamic deflection compared to the AC hydraulic passive suspension, which shows that the single-pump active suspension can better cope with different road conditions and provide a more comfortable and safe driving experience. Especially under more severe road conditions such as E-class roads, the advantages of the single-pump active suspension are more obvious, and the optimization degree of the three evaluation indicators has reached more than 15%, especially in terms of body acceleration and suspension dynamic deflection, which has even reached more than 20%. It has a better optimization effect on more severe roads, which is also fully in line with the application environment and suspension performance requirements of heavy-duty vehicles.

[0051] The AMESim modeling and simulation comparison of the AC hydraulic dual-pump active suspension found that under C-level and E-level road conditions, the AC hydraulic dual-pump active suspension showed better performance than the AC hydraulic passive suspension in terms of body acceleration and suspension dynamic deflection, providing better ride comfort. Especially on uneven E-level roads, the improvement in the root mean square value of body acceleration even reached 39%. However, in terms of road wheel deformation, the dual-pump active suspension performed poorly. Under C-level road conditions, it even deteriorated by 41.83% compared with the passive suspension. Even if it was slightly improved under E-level road conditions, its optimization degree was only 1.59%.

[0052] Finally, considering the suspension performance, system characteristics and economic benefits, the single pump active suspension system with the best comprehensive performance was selected as the best structural design scheme. Subsequently, the suspension performance was further optimized by optimizing its active control mode from PID control to fuzzy control. The structural model of the suspension system was built in AMESim, and the control model of fuzzy control was built in MATLAB / Simulink. Finally, the joint simulation results of the two softwares proved that the single pump active suspension under fuzzy control reduced the body acceleration, road wheel deformation and suspension dynamic deflection by 19.9%, 4.24% and 10.69% respectively under C-class road conditions of 54km / h, and by 22.35%, 22.03% and 21.46% respectively under E-class road conditions of 27km / h. The improvement effect is very significant.

[0053] It should be noted that the above detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present application belongs.

[0054] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments described in the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0055] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0056] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0057] For ease of description, spatially relative terms, such as "above", "above", "on the upper surface of", "above", etc., may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0058] In the above detailed description, reference is made to the accompanying drawings, which form a part of this document. In the accompanying drawings, similar symbols typically identify similar components unless the context indicates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be used, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein.

[0059] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An AC hydraulic valve-controlled passive suspension system, characterized in that: The passive suspension system includes a vibration reduction system and an oil replenishment system, wherein the vibration reduction system includes a hydraulic cylinder and a balancing valve, wherein the hydraulic cylinder is connected to the vehicle body through a cylinder body connecting piece, and the hydraulic cylinder is divided into an upper hydraulic cylinder and a lower hydraulic cylinder, and the upper hydraulic cylinder and the lower hydraulic cylinder are symmetrically arranged on the upper and lower sides of the wheel respectively, and the piston rods of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to the wheel through a piston rod connecting piece, the lower end of the upper hydraulic cylinder is connected to the upper end of the lower hydraulic cylinder through a first circuit, and a first balancing valve is arranged in the first circuit, and the upper end of the upper hydraulic cylinder and the lower end of the lower hydraulic cylinder are connected through a second circuit, and a second balancing valve is arranged in the second circuit The oil replenishment system includes a first hydraulic pump, a first electromagnetic switch valve, a first three-position four-way electromagnetic reversing valve, and a first accumulator. The lower ends of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to an interface of the first three-position four-way electromagnetic reversing valve through a first one-way valve, and the upper ends of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to another interface of the same end of the first three-position four-way electromagnetic reversing valve through the first one-way valve. One interface at the other end of the first three-position four-way electromagnetic reversing valve is grounded, and the other interface is connected to one end of the first electromagnetic switch valve and the first accumulator. The other end of the first electromagnetic switch valve is respectively connected to the third overflow valve and the first hydraulic pump through the second one-way valve.

2. The AC hydraulic valve-controlled passive suspension system according to claim 1, characterized in that: Throttle valves are provided in both the first circuit and the second circuit.

3. The AC hydraulic valve-controlled passive suspension system according to claim 1, characterized in that: A first overflow valve is provided in the first circuit, and a second overflow valve is provided in the second circuit.

4. An AC hydraulic valve-controlled active suspension system, characterized in that: The invention comprises a valve-controlled active control system and a passive suspension system, wherein the passive suspension system comprises a vibration reduction system and an oil replenishment system, the vibration reduction system comprises a hydraulic cylinder, a balancing valve, and a relief valve, the hydraulic cylinder is connected to the vehicle body through a cylinder body connecting piece, the hydraulic cylinder is divided into an upper hydraulic cylinder and a lower hydraulic cylinder, the upper hydraulic cylinder and the lower hydraulic cylinder are symmetrically arranged on the upper and lower sides of the wheel respectively, and the piston rods of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to the wheel through a piston rod connecting piece, the lower end of the upper hydraulic cylinder is connected to the upper end of the lower hydraulic cylinder through a first circuit, a first balancing valve and a first relief valve are arranged in the first circuit, the upper end of the upper hydraulic cylinder and the lower end of the lower hydraulic cylinder are connected to the lower end of the lower hydraulic cylinder through a second circuit, a second balancing valve and a second relief valve are arranged in the second circuit, a throttle valve is arranged in both the first circuit and the second circuit, the oil replenishment system comprises a first hydraulic pump, a first electromagnetic switch valve, a first three-position four-way electromagnetic reversing valve, and a first accumulator, the lower ends of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to an interface of the first three-position four-way electromagnetic reversing valve through a first one-way valve, the upper The upper ends of the hydraulic cylinder and the lower hydraulic cylinder are connected to another interface at the same end of the first three-position four-way solenoid reversing valve through a first one-way valve, an interface at the other end of the first three-position four-way solenoid reversing valve is grounded, and another interface is connected to one end of the first solenoid switch valve and the first accumulator, and the other end of the first solenoid switch valve is respectively connected to the third overflow valve and the first hydraulic pump through a second one-way valve, the valve-controlled active control system includes a first central processor, a second solenoid switch valve, a second three-position four-way solenoid reversing valve, a second hydraulic pump, and a fourth overflow valve, an interface at one end of the second solenoid switch valve is connected to the upper end of the upper hydraulic cylinder, another interface is connected to the lower end of the lower hydraulic cylinder, and the other end is connected to one end of the second three-position four-way solenoid reversing valve, an interface at the other end of the second three-position four-way solenoid reversing valve is grounded, and another interface is respectively connected to the fourth overflow valve and the second hydraulic pump, the first central processor obtains the displacement signal of the wheel through the displacement sensor, and the first central processor analyzes and calculates the signal and feeds it back to the second three-position four-way solenoid reversing valve and controls it.

5. The AC hydraulic valve-controlled active suspension system according to claim 4, characterized in that: An adjustable flow valve is also arranged between the second electromagnetic switch valve and the hydraulic cylinder.

6. An AC hydraulic single pump controlled active suspension system, characterized in that: The invention comprises a single pump-controlled active control system and a passive suspension system, wherein the passive suspension system comprises a vibration reduction system and an oil replenishment system, the vibration reduction system comprises a hydraulic cylinder, a balancing valve, and an overflow valve, the hydraulic cylinder is connected to the vehicle body through a cylinder body connecting piece, the hydraulic cylinder is divided into an upper hydraulic cylinder and a lower hydraulic cylinder, the upper hydraulic cylinder and the lower hydraulic cylinder are symmetrically arranged on the upper and lower sides of the wheel respectively, and the piston rods of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to the wheel through a piston rod connecting piece, the lower end of the upper hydraulic cylinder is connected to the upper end of the lower hydraulic cylinder through a first circuit, a first balancing valve and a first overflow valve are arranged in the first circuit, the upper end of the upper hydraulic cylinder and the lower end of the lower hydraulic cylinder are connected to the lower end of the lower hydraulic cylinder through a second circuit, a second balancing valve and a second overflow valve are arranged in the second circuit, a throttle valve is arranged in both the first circuit and the second circuit, the oil replenishment system comprises a first hydraulic pump, a first electromagnetic switch valve, a first three-position four-way electromagnetic reversing valve, and a first accumulator, the lower ends of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to an interface of the first three-position four-way electromagnetic reversing valve through a first one-way valve, the The upper ends of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to another interface at the same end of the first three-position four-way electromagnetic reversing valve through a first one-way valve, one interface at the other end of the first three-position four-way electromagnetic reversing valve is grounded, and the other interface is connected to one end of the first electromagnetic switch valve and the first accumulator, and the other end of the first electromagnetic switch valve is respectively connected to the third overflow valve and the first hydraulic pump through the second one-way valve, and the single pump control active control system includes a driver, a second central processing unit, a servo motor, a double-acting hydraulic pump, a second accumulator, a fifth overflow valve, a sixth overflow valve, and two third electromagnetic switch valves, the two third electromagnetic switch valves are respectively connected to the upper end of the upper hydraulic cylinder and the lower end of the lower hydraulic cylinder, the fifth overflow valve, the sixth overflow valve, and the second accumulator are connected in parallel between the two third electromagnetic switch valves and connected to one end of the double-acting hydraulic pump, and the other end of the double-acting hydraulic pump is connected to the driver through a servo motor, and the second central processing unit obtains the displacement signal of the wheel through a displacement sensor, and the second central processing unit analyzes and calculates the signal and feeds it back to the driver to control the double-acting hydraulic pump.

7. The AC hydraulic single pump controlled active suspension system according to claim 6, characterized in that: A third one-way valve is also provided at both ends of the second accumulator.

8. The AC hydraulic single pump controlled active suspension system according to claim 6, characterized in that: A one-way throttle valve is arranged between the two third electromagnetic switch valves and the double-acting hydraulic pump.

9. An AC hydraulic dual-pump controlled active suspension system, characterized in that: The invention comprises a dual-pump active control system and a passive suspension system, wherein the passive suspension system comprises a vibration reduction system and an oil replenishment system, the vibration reduction system comprises a hydraulic cylinder, a balancing valve, and an overflow valve, the hydraulic cylinder is connected to the vehicle body through a cylinder body connecting piece, the hydraulic cylinder is divided into an upper hydraulic cylinder and a lower hydraulic cylinder, the upper hydraulic cylinder and the lower hydraulic cylinder are symmetrically arranged on the upper and lower sides of the wheel respectively, and the piston rods of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to the wheel through a piston rod connecting piece, the lower end of the upper hydraulic cylinder is connected to the upper end of the lower hydraulic cylinder through a first circuit, the first circuit is provided with a first balancing valve and a first overflow valve, the upper end of the upper hydraulic cylinder and The lower end of the lower hydraulic cylinder is connected through a second circuit, a second balancing valve and a second overflow valve are provided in the second circuit, a throttle valve is provided in both the first circuit and the second circuit, the oil replenishment system includes a first hydraulic pump, a first electromagnetic switch valve, a first three-position four-way electromagnetic reversing valve, and a first accumulator, the lower ends of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to an interface of the first three-position four-way electromagnetic reversing valve through a first one-way valve, the upper ends of the upper hydraulic cylinder and the lower hydraulic cylinder are connected to another interface of the same end of the first three-position four-way electromagnetic reversing valve through the first one-way valve, and the other end of the first three-position four-way electromagnetic reversing valve is connected to a The first electromagnetic switch valve is connected to the ground, and the other interface is connected to one end of the first electromagnetic switch valve and the first accumulator. The other end of the first electromagnetic switch valve is connected to the third relief valve and the first hydraulic pump through the second one-way valve. The dual-pump control active control system includes two single-pump control active control systems. The single-pump control active control system includes a driver, a servo motor, a double-acting hydraulic pump, a second accumulator, a fifth relief valve, a sixth relief valve, and two third electromagnetic switch valves. The fifth relief valve, the sixth relief valve, and the second accumulator are connected in parallel between the two third electromagnetic switch valves and connected to one end of the double-acting hydraulic pump. The second accumulator is provided with a third single relief valve at both ends. A one-way throttle valve is arranged between the two third electromagnetic switch valves and the double-acting hydraulic pump. The other end of the double-acting hydraulic pump is connected to the driver through a servo motor. The two third electromagnetic switch valves of one single-pump active control system are respectively connected to the upper and lower ends of the upper hydraulic cylinder, and the two third electromagnetic switch valves of the other single-pump active control system are respectively connected to the upper and lower ends of the lower hydraulic cylinder. The second central processing unit obtains the displacement signal of the wheel through the displacement sensor, and the second central processing unit analyzes and calculates the signal and feeds it back to the drivers of the two single-pump active control systems to control the two double-acting hydraulic pumps respectively.

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