Hydraulic interconnection suspension system

Abstract

The invention belongs to the technical field of automobile damping systems, and provides a hydraulic interconnection suspension system which comprises a damper located at a wheel, the damper is provided with a height sensor for detecting the relative distance between the upper portion and the lower portion of a spring, an upper cavity of a hydraulic cylinder of the damper is communicated with a hydraulic energy accumulator, and the hydraulic energy accumulator is communicated with a two-way hydraulic pump through a reversing valve. And the height sensor, the reversing valve and the bidirectional hydraulic pump are electrically connected with a controller. Dynamic parameters of a vehicle body are monitored in real time through the height sensor, the controller controls the electromagnetic valve, the reversing valve and the two-way hydraulic pump to adjust the flowing direction and flow of hydraulic oil in a system pipeline according to the dynamic parameters, the system pressure is dynamically adjusted, and pressure distribution of each shock absorber is compensated and balanced; therefore, the anti-roll and anti-pitching performance of the vehicle is improved, the roll angle of the vehicle can be effectively reduced, the turnover probability is reduced, and the driving comfort is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile vibration reduction systems, and in particular relates to a hydraulic interconnected suspension system. Background Art

[0002] Compared with traditional suspension, hydraulic interconnected suspension realizes interconnection between four suspension shock absorbers through pipelines, transmits hydraulic pressure, and realizes load distribution between wheels. The roll angle of the vehicle when turning and the pitch angle when accelerating or braking are smaller than those of vehicles equipped with traditional suspension, which can improve the wheel contact in complex terrain and enhance the off-road performance of the vehicle.

[0003] However, the existing hydraulic interconnected suspension still has problems such as large roll angle, large center of mass offset and large change in wheel alignment angle. Large roll angle will increase the head movement of the occupants, which can easily cause dizziness and affect the riding experience of the occupants; large center of mass offset will aggravate load transfer, reduce the rollover limit, and make the vehicle more likely to roll over; large changes in wheel alignment angle will reduce the tire cornering stiffness, resulting in a decrease in tire cornering stiffness and poor tracking, which in turn leads to increased tire wear. In addition, large body shaking will make the driver feel uneasy, affecting driving comfort. Summary of the invention

[0004] The present invention provides a hydraulic interconnected suspension system, aiming to solve the above technical problems.

[0005] The present invention is implemented as follows: a hydraulic interconnected suspension system includes a shock absorber located at a wheel, the shock absorber is equipped with a height sensor for detecting the relative distance between the sprung and unsprung springs, the upper chamber of the hydraulic cylinder of the shock absorber is connected to a hydraulic accumulator, the hydraulic accumulator is connected to a bidirectional hydraulic pump via a reversing valve, and the height sensor, the reversing valve and the bidirectional hydraulic pump are electrically connected to a controller.

[0006] Furthermore, the upper chamber and lower chamber of the hydraulic cylinder of the shock absorber of the two front wheels are connected to each other via a solenoid valve, and the upper chamber and lower chamber of the hydraulic cylinder of the shock absorber of the two rear wheels are connected to each other via another solenoid valve, and the solenoid valve is electrically connected to the controller.

[0007] Furthermore, the hydraulic accumulator includes a first accumulator connected to the upper chamber of the hydraulic cylinder of the shock absorber of the left front wheel, a second accumulator connected to the upper chamber of the hydraulic cylinder of the shock absorber of the right front wheel, a third accumulator connected to the upper chamber of the hydraulic cylinder of the shock absorber of the left rear wheel, and a fourth accumulator connected to the upper chamber of the hydraulic cylinder of the shock absorber of the right rear wheel.

[0008] Furthermore, four reversing valves are provided. The first accumulator and the second accumulator are connected to the bi-directional hydraulic pump through the first reversing valve, the second reversing valve and the third reversing valve. The third accumulator and the fourth accumulator are connected to the bi-directional hydraulic pump through the fourth reversing valve, the second reversing valve and the third reversing valve.

[0009] Furthermore, the solenoid valve is a proportional solenoid valve. The first reversing valve, the third reversing valve and the fourth reversing valve are three-position four-way reversing valves, and the second reversing valve is a two-position four-way reversing valve.

[0010] The present invention also provides a control method for the above hydraulic interconnected suspension system. The control method includes the following steps: Obtain the relative distance information collected by the height sensor; According to the relative distance information, control the opening and closing degree of the solenoid valve and / or control the start and stop of the bi-directional hydraulic pump to compensate the hydraulic oil in the upper chamber or the lower chamber of the hydraulic cylinder of the shock absorber.

[0011] The present invention also provides a vehicle, which includes the above hydraulic interconnected suspension system.

[0012] The hydraulic interconnected suspension system provided by the present invention uses a height sensor to real-time monitor the body dynamic parameters. The controller controls the solenoid valve, the reversing valve and the bi-directional hydraulic pump according to the dynamic parameters to adjust the flow direction and flow rate of the hydraulic oil in the system pipeline, dynamically adjust the system pressure, compensate and balance the pressure distribution of each shock absorber, so as to improve the anti-roll and anti-pitch performance of the vehicle, effectively reduce the vehicle roll angle, reduce the rollover probability, and improve the riding comfort. In addition, when the suspension jumps at high speed, due to the action of the solenoid valve and the hydraulic accumulator, the pipeline damping is large, which can greatly reduce the probability of suspension breakdown. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the hydraulic interconnected suspension system provided by the embodiment of the present invention.

[0014] Figure 2 is a schematic connection diagram of the controller in the hydraulic interconnected suspension system provided by the embodiment of the present invention.

[0015] Figure 3 is a schematic working principle diagram of the hydraulic interconnected suspension system provided by the embodiment of the present invention in the vertical mode.

[0016] Figure 4 is a schematic working principle diagram of the hydraulic interconnected suspension system provided by the embodiment of the present invention in the roll mode.

[0017] Figure 5 is a schematic working principle diagram of the hydraulic interconnected suspension system provided by the embodiment of the present invention in the pitch mode.

[0018] The reference numerals in the figure respectively denote: 1 - the first hydraulic cylinder, 2 - the second hydraulic cylinder, 3 - the third hydraulic cylinder, 4 - the fourth hydraulic cylinder, 5 - the first solenoid valve, 6 - the second solenoid valve, 7 - the first reversing valve, 8 - the second reversing valve, 9 - the third reversing valve, 10 - the fourth reversing valve, 11 - the bi-directional hydraulic pump, 12 - the first accumulator, 13 - the second accumulator, 14 - the third accumulator, 15 - the fourth accumulator, 16 - the first height sensor, 17 - the second height sensor, 18 - the third height sensor, 19 - the fourth height sensor, 20 - the controller. Detailed implementation manners

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] Refer to Figure 1 、 2 , an embodiment of the present invention provides a hydraulically interconnected suspension system. The system includes shock absorbers located at the wheels. Taking a four-wheel vehicle as an example in the embodiment of the present invention, there are four shock absorbers, and the four shock absorbers respectively include the first hydraulic cylinder 1 of the left front wheel of the vehicle, the second hydraulic cylinder 2 of the right front wheel, the third hydraulic cylinder 3 of the left rear wheel, and the fourth hydraulic cylinder 4 of the right rear wheel.

[0021] The shock absorbers are equipped with height sensors for detecting the relative distance between the upper and lower parts of the spring. The relative distance between the upper and lower parts of the spring corresponds to the movement of the piston rod of the hydraulic cylinder of the shock absorber into or out of the hydraulic cylinder. The embodiment of the present invention includes four height sensors, and the four height sensors are respectively arranged near the four wheels, with one end connected to the vehicle body or the frame and the other end connected to the lower control arm or the steering knuckle under the spring. The four height sensors are respectively the first height sensor 16 arranged near the left front wheel of the vehicle, the second height sensor 17 arranged near the right front wheel, the third height sensor 18 arranged near the left rear wheel, and the fourth height sensor 19 arranged near the right rear wheel.

[0022] The upper chamber of the hydraulic cylinder of the shock absorber is communicated with a hydraulic accumulator. There are four hydraulic accumulators, including the first accumulator 12 communicating with the upper chamber of the hydraulic cylinder of the shock absorber of the left front wheel, the second accumulator 13 communicating with the upper chamber of the hydraulic cylinder of the shock absorber of the right front wheel, the third accumulator 14 communicating with the upper chamber of the hydraulic cylinder of the shock absorber of the left rear wheel, and the fourth accumulator 15 communicating with the upper chamber of the hydraulic cylinder of the shock absorber of the right rear wheel.

[0023] Accordingly, in the embodiment of the present invention, the upper chamber of the first hydraulic cylinder 1 communicates with the first accumulator 12, the upper chamber of the second hydraulic cylinder 2 communicates with the second accumulator 13, the upper chamber of the third hydraulic cylinder 3 communicates with the third accumulator 14, and the upper chamber of the fourth hydraulic cylinder 4 communicates with the fourth accumulator 15.

[0024] Meanwhile, the upper chambers and the lower chambers of the hydraulic cylinders of the two front-wheel shock absorbers communicate with each other through a solenoid valve, and the upper chambers and the lower chambers of the hydraulic cylinders of the shock absorbers of the two rear wheels communicate with each other through another solenoid valve. The solenoid valves are electrically connected to the controller 20.

[0025] As Figure 1 shown, in the embodiment of the present invention, the upper chamber and the lower chamber of the first hydraulic cylinder 1 communicate with the upper chamber and the lower chamber of the second hydraulic cylinder 2 through the first solenoid valve 5, and the upper chamber and the lower chamber of the third hydraulic cylinder 3 communicate with the upper chamber and the lower chamber of the fourth hydraulic cylinder 4 through the second solenoid valve 6. The first solenoid valve 5 and the second solenoid valve 6 are proportional solenoid valves. After being energized, the opening and closing degree of the valve can be changed by adjusting the input current value. When the energized current value reaches the set value, the flow channels connected inside the solenoid valve will be switched. When the first solenoid valve 5 and the second solenoid valve 6 are not energized or the energized current value does not reach the switching current value, the x flow channels in the first solenoid valve 5 and the second solenoid valve 6 are connected, and the upper chamber and the lower chamber of the first hydraulic cylinder 1 are cross-connected with the upper chamber and the lower chamber of the second hydraulic cylinder 2, and the upper chamber and the lower chamber of the third hydraulic cylinder 3 are cross-connected with the upper chamber and the lower chamber of the fourth hydraulic cylinder 4; when the first solenoid valve 5 and the second solenoid valve 6 are energized and reach the switching current value, the first solenoid valve 5 and the second solenoid valve 6 are switched to the = flow channels, and the upper chamber and the lower chamber of the first hydraulic cylinder 1 are parallel-connected with the upper chamber and the lower chamber of the second hydraulic cylinder 2, and the upper chamber and the lower chamber of the third hydraulic cylinder 3 are parallel-connected with the upper chamber and the lower chamber of the fourth hydraulic cylinder 4. The combination of the two solenoid valves can adjust the flow rate and flow direction of the hydraulic oil.

[0026] The hydraulic accumulator is connected to a bidirectional hydraulic pump 11 through a reversing valve. The height sensor, the reversing valve, and the bidirectional hydraulic pump 11 are electrically connected to a controller 20.

[0027] In the embodiment of the present invention, there are four reversing valves. The first accumulator 12 and the second accumulator 13 are connected to the bidirectional hydraulic pump 11 through the first reversing valve 7, the second reversing valve 8, and the third reversing valve 9. The third accumulator 14 and the fourth accumulator 15 are connected to the bidirectional hydraulic pump 11 through the fourth reversing valve 10, the second reversing valve 8, and the third reversing valve 9. The first reversing valve 7, the third reversing valve 9, and the fourth reversing valve 10 are three-position four-way reversing valves, and the second reversing valve 8 is a two-position four-way reversing valve. As Figure 1As shown, the first reversing valve 7 and the fourth reversing valve 10 are in the middle position when not energized. After being energized, the first reversing valve 7 and the fourth reversing valve 10 each have two connection states. After being energized, they can be switched upward to cross-connection or downward to parallel connection; the second reversing valve 8 is in the parallel connection state when not energized and is switched to the two-in-one connection state to the right after being energized; when the third reversing valve 9 is not energized, the bi-directional hydraulic pump 11 is not connected to the pipeline. When the third reversing valve 9 is energized, the bi-directional hydraulic pump 11 has two connection states with the pipeline. When the third reversing valve 9 is switched to the left, the bi-directional hydraulic pump 11 is in parallel connection with the pipeline. When the third reversing valve 9 is switched to the right, the bi-directional hydraulic pump 11 is in cross-connection with the pipeline.

[0028] The bi-directional hydraulic pump 11 can work in two directions, that is, it can transport hydraulic oil in the forward direction or in the reverse direction. The first reversing valve 7, the second reversing valve 8, the third reversing valve 9, and the fourth reversing valve 10 cooperate with the bi-directional hydraulic pump 11 to change the flow direction of the hydraulic oil in the pipeline, so that the hydraulic oil flows in the pipeline according to the set pressure and flow rate.

[0029] In the embodiment of the present invention, the first height sensor 16, the second height sensor 17, the third height sensor 18, the fourth height sensor 19, the first solenoid valve 5, the second solenoid valve 6, the first reversing valve 7, the second reversing valve 8, the third reversing valve 9, the fourth reversing valve 10, and the bi-directional hydraulic pump 11 are electrically connected to the controller 20. The controller 20 is a programmable logic controller. The controller 20 controls the actions of the first solenoid valve 5, the second solenoid valve 6, the first reversing valve 7, the second reversing valve 8, the third reversing valve 9, the fourth reversing valve 10, and the bi-directional hydraulic pump 11 according to the dynamic parameters real-time monitored by the first height sensor 16, the second height sensor 17, the third height sensor 18, and the fourth height sensor 19 to adapt to different driving conditions and optimize the distribution of hydraulic oil.

[0030] In the vertical mode of the hydraulic interconnection suspension system provided by the embodiment of the present invention, such as when the vehicle is driving at a constant speed on a flat road surface, as Figure 3As shown, the first reversing valve 7, the second reversing valve 8, the third reversing valve 9, the fourth reversing valve 10 and the bi-directional hydraulic pump 11 are de-energized, the first solenoid valve 5 and the second solenoid valve 6 are energized and do not reach the switching current value, the x-channel is connected, and the opening and closing degrees of the two solenoid valves are adjusted through the controller 20, thereby adjusting the softness and hardness of the suspension. The piston rods in the first hydraulic cylinder 1, the second hydraulic cylinder 2, the third hydraulic cylinder 3 and the fourth hydraulic cylinder 4 have the same state and the same degree of compression. The movement direction of the piston rods in the hydraulic cylinders is moving into the hydraulic cylinders as shown by the thick arrows in the figure. The hydraulic oil in the upper chambers of the first hydraulic cylinder 1, the second hydraulic cylinder 2, the third hydraulic cylinder 3 and the fourth hydraulic cylinder 4 flows into the lower chambers of the cross-connected hydraulic cylinders for replenishment. Due to the presence of the piston rods, there is a flow difference between the upper and lower chambers of the hydraulic cylinders, so that part of the hydraulic oil in the upper chamber of the first hydraulic cylinder 1 enters the first accumulator 12, part of the hydraulic oil in the upper chamber of the second hydraulic cylinder 2 enters the second accumulator 13, part of the hydraulic oil in the upper chamber of the third hydraulic cylinder 3 enters the third accumulator 14, and part of the hydraulic oil in the upper chamber of the fourth hydraulic cylinder 4 enters the fourth accumulator 15, and the pressure of the whole system rises slightly, without affecting the vertical stiffness of the vehicle. When the piston rods in the first hydraulic cylinder 1, the second hydraulic cylinder 2, the third hydraulic cylinder 3 and the fourth hydraulic cylinder 4 are stretched, that is, when the piston rods move out of the hydraulic cylinders, the hydraulic oil in the lower chambers of the first hydraulic cylinder 1, the second hydraulic cylinder 2, the third hydraulic cylinder 3 and the fourth hydraulic cylinder 4 flows into the upper chambers of the cross-connected hydraulic cylinders for replenishment, and the first accumulator 12, the second accumulator 13, the third accumulator 14 and the fourth accumulator 15 discharge oil to compensate for the hydraulic oil volume of the whole system.

[0031] In the roll mode of the hydraulic interconnected suspension system provided by the embodiment of the present invention, when the vehicle turns right, such as Figure 4As shown, the first reversing valve 7, the second reversing valve 8, the third reversing valve 9, the fourth reversing valve 10 and the bi-directional hydraulic pump 11 are de-energized, the first solenoid valve 5 and the second solenoid valve 6 are energized and do not reach the switching current value, the x-channel is connected, and the opening and closing degrees of the two solenoid valves are adjusted through the controller 20, thereby adjusting the softness and hardness of the suspension. Under the action of the centripetal force, the vehicle body tilts to the left, the piston rods of the first hydraulic cylinder 1 and the third hydraulic cylinder 3 move into the hydraulic cylinders, and the piston rods of the second hydraulic cylinder 2 and the fourth hydraulic cylinder 4 move out of the hydraulic cylinders. The hydraulic oil in the upper chambers of the first hydraulic cylinder 1 and the lower chambers of the second hydraulic cylinder 2 connected thereto is compressed and flows into the first accumulator 12, and the hydraulic oil in the upper chambers of the third hydraulic cylinder 3 and the lower chambers of the fourth hydraulic cylinder 4 connected thereto is compressed and flows into the third accumulator 14, and the pipeline pressure increases. The hydraulic oil in the lower chambers of the first hydraulic cylinder 1, the upper chambers of the second hydraulic cylinder 2, the lower chambers of the third hydraulic cylinder 3 and the upper chambers of the fourth hydraulic cylinder 4 is stretched. The second accumulator 13 discharges oil to the lower chambers of the first hydraulic cylinder 1 and the upper chambers of the second hydraulic cylinder 2 respectively, and the fourth accumulator 15 discharges oil to the lower chambers of the third hydraulic cylinder 3 and the upper chambers of the fourth hydraulic cylinder 4 respectively, and the pipeline pressure decreases. Thus, under the action of the pressure difference between the red pipeline and the blue pipeline, a counter-torsion moment is generated to resist the roll movement of the vehicle body, and at the same time, the degree of understeer of the vehicle is reduced.

[0032] In the pitch mode provided by the hydraulic interconnected suspension system according to the embodiment of the present invention, such as when the vehicle brakes, as Figure 5 As shown, the first reversing valve 7, the second reversing valve 8, the third reversing valve 9, the fourth reversing valve 10 and the bi-directional hydraulic pump 11 are de-energized, the first solenoid valve 5 and the second solenoid valve 6 are energized and do not reach the switching current value, the x-channel is connected, and the opening and closing degrees of the two solenoid valves are adjusted through the controller 20, thereby adjusting the softness and hardness of the suspension. Under the action of inertia, the vehicle body dives forward, the piston rods of the first hydraulic cylinder 1 and the second hydraulic cylinder 2 of the two front wheels are pressed, a part of the hydraulic oil compressed in the upper chamber of the first hydraulic cylinder 1 flows into the first accumulator 12, and another part flows into the lower chamber of the second hydraulic cylinder 2. A part of the hydraulic oil compressed in the upper chamber of the second hydraulic cylinder flows into the second accumulator 13, and another part flows into the lower chamber of the first hydraulic cylinder. The piston rods of the third hydraulic cylinder 3 and the fourth hydraulic cylinder 4 of the two rear wheels are stretched, the hydraulic oil in the lower chamber of the third hydraulic cylinder 3 flows to the upper chamber of the fourth hydraulic cylinder 4 cross-connected thereto, and the hydraulic oil in the lower chamber of the fourth hydraulic cylinder 3 flows to the upper chamber of the third hydraulic cylinder 3 cross-connected thereto. At the same time, the third accumulator 14 discharges oil to the upper chamber of the third hydraulic cylinder 3, and the fourth accumulator 15 discharges oil to the upper chamber of the fourth hydraulic cylinder 4 to compensate for the volume of the hydraulic oil in the system, thereby reducing the amplitude of the vehicle body shaking.

[0033] In addition, the present invention can also achieve independent control of the four wheels. When the controller 20 is data-connected to the vehicle's on-board computer, an active lifting mode can be achieved. For example, the controller 20 controls the two-way hydraulic pump 11 to start, providing flowing power for the hydraulic oil in the pipeline. The controller 20 controls the directions and opening / closing degrees of the first reversing valve 7, the second reversing valve 8, the third reversing valve 9, the fourth reversing valve 10, the first solenoid valve 5, and the second solenoid valve 6, so that the hydraulic oil in the first accumulator 12, the second accumulator 13, the third accumulator 14, and the fourth accumulator 15 flows into the upper chambers of the first hydraulic cylinder 1, the second hydraulic cylinder 2, the third hydraulic cylinder 3, and the fourth hydraulic cylinder 4, raising the whole body of the vehicle and improving the vehicle's passability.

[0034] An anti-roll mode can be achieved. For example, the vehicle's camera connected to the on-board computer system obtains the information of the road ahead, or the vehicle navigation information. If the vehicle needs to turn right ahead, the controller 20 prepares in advance to control the two-way hydraulic pump 11, the first reversing valve 7, the second reversing valve 8, the third reversing valve 9, the fourth reversing valve 10, the first solenoid valve 5, and the second solenoid valve 6, and quickly reacts when the vehicle turns to make the system enter the roll mode described in the foregoing embodiment, improving the ride comfort.

[0035] An anti-pitch mode can be achieved. For example, the vehicle's camera connected to the on-board computer system obtains the speed and distance information of the vehicle ahead. If the vehicle ahead decelerates and the distance between the two vehicles decreases, then the vehicle needs to brake and decelerate. The controller 20 prepares in advance to control the two-way hydraulic pump 11, the first reversing valve 7, the second reversing valve 8, the third reversing valve 9, the fourth reversing valve 10, the first solenoid valve 5, and the second solenoid valve 6, and quickly reacts when the vehicle brakes to make the system enter the pitch mode described in the foregoing embodiment, improving the ride comfort.

[0036] In summary, the hydraulic interconnected suspension system provided by the embodiments of the present invention can effectively reduce the vehicle's roll angle, reduce the probability of rollover, improve the ride comfort, and improve the vehicle's uphill performance. In addition, when the suspension bounces at high speed, due to the action of the solenoid valve and the hydraulic accumulator, the pipeline damping is large, which can greatly reduce the probability of suspension breakdown.

[0037] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydraulic interconnected suspension system, comprising a shock absorber located at a wheel, characterized in that: The shock absorber is equipped with a height sensor for detecting the relative distance between the spring and the unsprung spring. The upper chamber of the hydraulic cylinder of the shock absorber is connected to a hydraulic accumulator, and the hydraulic accumulator is connected to a bidirectional hydraulic pump via a reversing valve. The height sensor, the reversing valve and the bidirectional hydraulic pump are electrically connected to a controller.

2. The hydraulic interconnected suspension system according to claim 1, characterized in that: The upper chamber and the lower chamber of the hydraulic cylinder of the shock absorber of the two front wheels are connected to each other through an electromagnetic valve, and the upper chamber and the lower chamber of the hydraulic cylinder of the shock absorber of the two rear wheels are connected to each other through another electromagnetic valve, and the electromagnetic valve is electrically connected to the controller.

3. The hydraulic interconnected suspension system according to claim 2, characterized in that: The hydraulic accumulator includes a first accumulator connected to the upper chamber of the hydraulic cylinder of the shock absorber of the left front wheel, a second accumulator connected to the upper chamber of the hydraulic cylinder of the shock absorber of the right front wheel, a third accumulator connected to the upper chamber of the hydraulic cylinder of the shock absorber of the left rear wheel, and a fourth accumulator connected to the upper chamber of the hydraulic cylinder of the shock absorber of the right rear wheel.

4. The hydraulic interconnected suspension system according to claim 3, characterized in that: There are four reversing valves, the first accumulator and the second accumulator are connected to the bidirectional hydraulic pump via the first reversing valve, the second reversing valve and the third reversing valve, and the third accumulator and the fourth accumulator are connected to the bidirectional hydraulic pump via the fourth reversing valve, the second reversing valve and the third reversing valve.

5. The hydraulic interconnected suspension system according to claim 4, characterized in that: The solenoid valve is a proportional solenoid valve, the first reversing valve, the third reversing valve and the fourth reversing valve are three-position four-way reversing valves, and the second reversing valve is a two-position four-way reversing valve.

6. The control method of the hydraulic interconnected suspension system according to any one of claims 2 to 5, characterized in that: The following steps are involved: Obtain the relative distance information collected by the height sensor; The opening and closing degree of the electromagnetic valve and / or the start and stop of the bidirectional hydraulic pump are controlled according to the relative distance information to compensate the hydraulic oil in the upper chamber or the lower chamber of the hydraulic cylinder of the shock absorber.

7. A vehicle, characterized in that: A hydraulic interconnected suspension system comprising any one of claims 1 to 5.

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