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, and a hydraulic cylinder upper cavity and a hydraulic cylinder lower cavity of the damper are communicated with electromagnetic valves respectively. The electromagnetic valve is communicated with two hydraulic energy accumulators and a reversing valve, the two hydraulic energy accumulators are respectively communicated with the reversing valve, the reversing valve is communicated with a hydraulic pump, and the height sensor, the electromagnetic valve, the reversing valve and the hydraulic pump are electrically connected with a controller. The height sensor is used for monitoring dynamic parameters of a vehicle body in real time, the controller controls the electromagnetic valve, the reversing valve and the 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, so that the anti-roll and anti-pitching performance of the vehicle is improved, and the service life of the vehicle is prolonged. 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 hydraulically 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 spring and the unsprung spring, the upper chamber and the lower chamber of the hydraulic cylinder of the shock absorber are respectively connected to solenoid valves, the solenoid valves are connected to two hydraulic accumulators and a reversing valve, the two hydraulic accumulators are respectively connected to the reversing valves, the reversing valves are connected to a hydraulic pump, and the height sensor, the solenoid valve, the reversing valve and the hydraulic pump are electrically connected to a controller.

[0006] Further, the solenoid valve includes a first solenoid valve, a second solenoid valve, a third solenoid valve and a fourth solenoid valve. The upper chamber and the lower chamber of the hydraulic cylinder of the shock absorber of the left front wheel are connected to the first solenoid valve, the upper chamber and the lower chamber of the hydraulic cylinder of the shock absorber of the right front wheel are connected to the second solenoid valve, the upper chamber and the lower chamber of the hydraulic cylinder of the shock absorber of the left rear wheel are connected to the third solenoid valve, the upper chamber and the lower chamber of the hydraulic cylinder of the shock absorber of the right rear wheel are connected to the fourth solenoid valve, the first solenoid valve is cross-connected with the fourth solenoid valve, and the second solenoid valve is cross-connected with the third solenoid valve.

[0007] Further, the hydraulic accumulator includes a first accumulator, a second accumulator, a third accumulator, and a fourth accumulator. The first solenoid valve and the fourth solenoid valve connect the first accumulator and the second accumulator, and the second solenoid valve and the third solenoid valve connect the third accumulator and the fourth accumulator.

[0008] Further, the reversing valve includes a first reversing valve and a second reversing valve. The first accumulator and the second accumulator are connected to the first reversing valve, and the third accumulator and the fourth accumulator are connected to the second reversing valve.

[0009] Further, the first solenoid valve, the second solenoid valve, the third solenoid valve, and the fourth solenoid valve are proportional solenoid valves, and the first reversing valve and the second reversing valve are two-position four-way reversing valves.

[0010] The present invention also provides a control method for the above hydraulic interconnected suspension system, including 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 hydraulic pump to compensate for 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 including 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 hydraulic pump according to the dynamic parameters to adjust the flow direction and flow rate of the hydraulic oil in the system pipeline, dynamically regulate the system pressure, compensate and balance the pressure distribution of each shock absorber, thereby improving the anti-roll and anti-pitch performance of the vehicle, effectively reducing the vehicle roll angle, reducing the probability of rollover, and improving the ride comfort. In addition, when the suspension bounces at high speed, due to the action of the solenoid valve and the 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 in the vertical mode provided by the embodiment of the present invention.

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

[0017] Figure 5 It is the 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 represent: 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 third solenoid valve, 8 - the fourth solenoid valve, 9 - the first reversing valve, 10 - the second reversing valve, 11 - the 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 For example, the embodiment of the present invention provides a hydraulic interconnected suspension system, which includes shock absorbers located at the wheels. Taking a four-wheel vehicle as an example, 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 installed 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, which are respectively arranged near the four wheels, with one end connected to the vehicle body or frame and the other end connected to the lower control arm or 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 and the lower chamber of the hydraulic cylinder of the shock absorber are respectively connected to solenoid valves, and the solenoid valves are connected to two hydraulic accumulators and reversing valves, and the two hydraulic accumulators are respectively connected to the reversing valves.

[0023] The solenoid valves include a first solenoid valve 5, a second solenoid valve 6, a third solenoid valve 7, and a fourth solenoid valve 8. The upper cavity and the lower cavity of the hydraulic cylinder of the shock absorber of the left front wheel are connected to the first solenoid valve 5. The upper cavity and the lower cavity of the hydraulic cylinder of the shock absorber of the right front wheel are connected to the second solenoid valve 6. The upper cavity and the lower cavity of the hydraulic cylinder of the shock absorber of the left rear wheel are connected to the third solenoid valve 7. The upper cavity and the lower cavity of the hydraulic cylinder of the shock absorber of the right rear wheel are connected to the fourth solenoid valve 8. The first solenoid valve 5 and the fourth solenoid valve 8 are cross-connected, and the second solenoid valve 6 and the third solenoid valve 7 are cross-connected.

[0024] As Figure 1 shown, in the embodiment of the present invention, the solenoid valve is a proportional solenoid valve. After being energized, the opening and closing degree of the valve can be changed by adjusting the input current value. After being energized, when the current value reaches the set value, the pipeline connected inside the solenoid valve will be switched. Taking the first hydraulic cylinder 1 and the first solenoid valve 5 as an example, when the first solenoid valve 5 is not energized, the upper cavity and the lower cavity of the first hydraulic cylinder 1 are connected to the x pipeline in the first solenoid valve 5, and the first solenoid valve 5 is in a fully open state; when the first solenoid valve 5 is energized and reaches the switching current value, the upper cavity and the lower cavity of the first hydraulic cylinder 1 are connected to the = pipeline in the first solenoid valve 5. The same applies to the second solenoid valve 6, the third solenoid valve 7, and the fourth solenoid valve 8.

[0025] Based on this, when none of the first solenoid valve 5, the second solenoid valve 6, the third solenoid valve 7, and the fourth solenoid valve 8 is energized, the upper cavity of the first hydraulic cylinder 1 is connected to the lower cavity of the fourth hydraulic cylinder 4, the lower cavity of the first hydraulic cylinder 1 is connected to the upper cavity of the fourth hydraulic cylinder 4, the upper cavity of the second hydraulic cylinder 2 is connected to the lower cavity of the third hydraulic cylinder 3, and the lower cavity of the second hydraulic cylinder 2 is connected to the upper cavity of the third hydraulic cylinder 3.

[0026] When the first solenoid valve 5 or the fourth solenoid valve 8 is energized and reaches the switching current value, the upper cavity of the first hydraulic cylinder 1 is connected to the upper cavity of the fourth hydraulic cylinder 4, and the lower cavity of the first hydraulic cylinder 1 is connected to the lower cavity of the fourth solenoid valve 8; when the second solenoid valve 6 or the third solenoid valve 7 is energized and reaches the switching current value, the upper cavity of the second hydraulic cylinder 2 is connected to the upper cavity of the third hydraulic cylinder 3, and the lower cavity of the second hydraulic cylinder 2 is connected to the lower cavity of the third hydraulic cylinder 3. The combination of the four solenoid valves can adjust the flow rate and flow direction of the hydraulic oil.

[0027] The hydraulic accumulators include a first accumulator 12, a second accumulator 13, a third accumulator 14, and a fourth accumulator 15. The first solenoid valve 5 and the fourth solenoid valve 8 are connected to the first accumulator 12 and the second accumulator 13, and the second solenoid valve 6 and the third solenoid valve 7 are connected to the third accumulator 14 and the fourth accumulator 15.

[0028] In the embodiment of the present invention, when the x-channels of the first solenoid valve 5, the second solenoid valve 6, the third solenoid valve 7, and the fourth solenoid valve 8 are connected, the upper chamber of the first hydraulic cylinder 1 and the lower chamber of the fourth hydraulic cylinder 4 are connected to the first accumulator 12, the lower chamber of the first hydraulic cylinder 1 and the upper chamber of the fourth hydraulic cylinder 4 are connected to the second accumulator 13, the lower chamber of the second hydraulic cylinder 2 and the upper chamber of the third hydraulic cylinder 3 are connected to the third accumulator 14, and the upper chamber of the second hydraulic cylinder 2 and the lower chamber of the third hydraulic cylinder 3 are connected to the fourth accumulator 15.

[0029] When the solenoid valve is energized and reaches the switching current value, the connection situation between the hydraulic cylinder and the hydraulic accumulator will change. Taking the first solenoid valve 5 as an example, when the =-channel of the first solenoid valve 5 is connected, the upper chamber of the first hydraulic cylinder 1 is connected to the second accumulator 13, and the lower chamber of the first hydraulic cylinder 1 is connected to the first accumulator 12. The same applies to the second solenoid valve 6, the third solenoid valve 7, and the fourth solenoid valve 8.

[0030] The reversing valve includes a first reversing valve 9 and a second reversing valve 10. The first accumulator 12 and the second accumulator 13 are connected to the first reversing valve 9, and the third accumulator 14 and the fourth accumulator 15 are connected to the second reversing valve 10. Both the first reversing valve 9 and the second reversing valve 10 are two-position four-way reversing valves.

[0031] The reversing valve is connected to a hydraulic pump 11, and the height sensor, the solenoid valve, the reversing valve, and the hydraulic pump 11 are electrically connected to a controller 20.

[0032] When the first reversing valve 9 and the second reversing valve 10 are not energized, the hydraulic pump 11 is not connected to the pipeline. When the first reversing valve 9 and / or the second reversing valve 10 are energized, the hydraulic pump 11 is connected to the pipeline. The first reversing valve 9 and the second reversing valve 10 cooperate with the hydraulic pump 11 to provide power for the flow of the hydraulic oil in the pipeline, so that the hydraulic oil flows in the pipeline according to the set pressure and flow rate.

[0033] 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 third solenoid valve 7, the fourth solenoid valve 8, the first reversing valve 9, the second reversing valve 10, and the 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 third solenoid valve 7, the fourth solenoid valve 8, the first reversing valve 9, the second reversing valve 10, and the 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 the hydraulic oil.

[0034] 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, such as Figure 3As shown, the first reversing valve 9, the second reversing valve 10, and the hydraulic pump 11 are not powered on. The first solenoid valve 5, the second solenoid valve 6, the third solenoid valve 7, and the fourth solenoid valve 8 are powered on and do not reach the switching current value. The x-channel is connected, and the opening and closing degrees of the four 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 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, causing part of the hydraulic oil in the upper chamber of the first hydraulic cylinder 1 to enter the first accumulator 12, part of the hydraulic oil in the upper chamber of the second hydraulic cylinder 2 to enter the fourth accumulator 15, part of the hydraulic oil in the upper chamber of the third hydraulic cylinder 3 to enter the third accumulator 14, and part of the hydraulic oil in the upper chamber of the fourth hydraulic cylinder 4 to enter the second accumulator 13. The pressure of the entire 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. The first accumulator 11 and the second accumulator 12 release oil to compensate for the hydraulic oil volume of the overall system.

[0035] In the roll mode of the hydraulic interconnected suspension system provided by the embodiment of the present invention, when the vehicle turns right, for example, Figure 4As shown, the first reversing valve 9, the second reversing valve 10, and the hydraulic pump 11 are not powered on. The first solenoid valve 5, the second solenoid valve 6, the third solenoid valve 7, and the fourth solenoid valve 8 are powered on and do not reach the switching current value. The x-channel is connected. The opening and closing degrees of the four 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, the lower chambers of the second hydraulic cylinder 2, the upper chambers of the third hydraulic cylinder 3, and the lower chambers of the fourth hydraulic cylinder 4 is compressed and flows into the first accumulator 12, the third accumulator 14, the third accumulator 14, and the first accumulator 12 respectively, 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 tilting movement of the vehicle body, and at the same time, the degree of understeer of the vehicle is reduced.

[0036] In the pitch mode provided by the embodiment of the present invention, such as when the vehicle brakes, as Figure 5 As shown, the first reversing valve 9, the second reversing valve 10, and the hydraulic pump 11 are not powered on. The first solenoid valve 5, the second solenoid valve 6, the third solenoid valve 7, and the fourth solenoid valve 8 are powered on and do not reach the switching current value. The x-channel is connected. The opening and closing degrees of the four 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. The hydraulic oil in the upper chamber of the first hydraulic cylinder 1 and the hydraulic oil in the lower chamber of the fourth hydraulic cylinder 4 are compressed and flow into the first accumulator 12. The hydraulic oil in the upper chamber of the second hydraulic cylinder 2 and the hydraulic oil in the lower chamber of the third hydraulic cylinder 3 are compressed and flow into the fourth accumulator 15. At the same time, the second accumulator 13 discharges oil to the lower chamber of the first hydraulic cylinder 1 and the upper chamber of the fourth hydraulic cylinder 4, and the third accumulator 14 discharges oil to the lower chamber of the second hydraulic cylinder 2 and the upper chamber of the third hydraulic cylinder 3, so as to realize the hydraulic oil supplement for the lower chambers of the two front-wheel hydraulic cylinders and the upper chambers of the two rear-wheel hydraulic cylinders, and reduce the shaking amplitude of the vehicle body.

[0037] 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 in-vehicle computer, an active lifting mode can be achieved. For example, the controller 20 controls the hydraulic pump 11 to start, and the first reversing valve 9 and the second reversing valve 10 are energized and connected to the pipeline to provide flowing power for the hydraulic oil in the pipeline. The first solenoid valve 5 and the third solenoid valve 7 are energized and switched to the bypass channel and fully opened. At this time, the upper chambers of the first hydraulic cylinder 1 and the fourth hydraulic cylinder 4 are connected to the second accumulator 13. Under the action of the hydraulic pump 11, the hydraulic oil in the second accumulator 13 flows into the upper chambers of the first hydraulic cylinder 1 and the fourth hydraulic cylinder 4 in equal volume respectively, and the hydraulic oil in the lower chambers of the first hydraulic cylinder 1 and the fourth hydraulic cylinder 4 flows into the first accumulator 12 for storage; the upper chambers of the second hydraulic cylinder 2 and the third hydraulic cylinder 3 are connected to the fourth accumulator 15. Under the action of the hydraulic cylinder 11, the hydraulic oil in the fourth accumulator 15 flows into the upper chambers of the second hydraulic cylinder 2 and the third hydraulic cylinder 3 in equal volume respectively, and the hydraulic oil in the lower chambers of the second hydraulic cylinder 2 and the third hydraulic cylinder 3 flows into the third accumulator 14 for storage. The above actions combined raise the entire vehicle body and improve the vehicle's passability.

[0038] An anti-roll mode can be achieved. For example, the vehicle's camera connected to the in-vehicle system obtains the road information ahead or the vehicle navigation information. If the vehicle needs to turn right ahead, the controller 20 prepares in advance to control the hydraulic pump 11, the first reversing valve 9, the second reversing valve 10, the first solenoid valve 5, the second solenoid valve 6, the third solenoid valve 7, and the fourth solenoid valve 8, and quickly reacts when the vehicle turns to make the system enter the roll mode described in the foregoing embodiment, improving the riding comfort.

[0039] An anti-pitch mode can be achieved. For example, the vehicle's camera connected to the in-vehicle system obtains the speed and distance information of the vehicle ahead. If the vehicle ahead decelerates and the distance between this vehicle and the vehicle ahead decreases, then this vehicle needs to brake and decelerate. The controller 20 prepares in advance to control the hydraulic pump 11, the first reversing valve 9, the second reversing valve 10, the first solenoid valve 5, the second solenoid valve 6, the third solenoid valve 7, and the fourth solenoid valve 8, and quickly reacts when the vehicle brakes to make the system enter the pitch mode described in the foregoing embodiment, improving the riding comfort.

[0040] A bounce-in-place mode can be achieved. For example, the controller 20 controls the hydraulic pump 11 to start to provide flowing power for the hydraulic oil in the pipeline. The controller 20 controls the first reversing valve 9, the second reversing valve 10, the first solenoid valve 5, the second solenoid valve 6, the third solenoid valve 7, and the fourth solenoid valve 8 to quickly reach the maximum opening and closing degree, so that the hydraulic oil in the first accumulator 11 and the second accumulator 12 quickly 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, causing the vehicle body to jump.

[0041] It can achieve the audio - video linkage mode. For example, by linking with the multimedia system of the vehicle head unit, when playing music in the vehicle, the controller 20 controls the hydraulic pump 11 to start, and the first reversing valve 9 and the second reversing valve 10 to be energized, providing flowing power for the hydraulic oil in the pipeline. The controller 20 controls the direction and opening degree of the first solenoid valve 5, the second solenoid valve 6, the third solenoid valve 7 and the fourth solenoid valve 8, and correspondingly adjusts the hydraulic oil in the upper and lower cavities of the first hydraulic cylinder 1, the second hydraulic cylinder 2, the third hydraulic cylinder 3 and the fourth hydraulic cylinder 4, so that the vehicle sways with the music melody.

[0042] In summary, the hydraulic interconnected suspension system provided by the embodiments of the present invention can effectively reduce the vehicle roll angle, reduce the probability of rollover, improve the ride comfort, and improve the uphill performance of the vehicle. 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, and the probability of suspension breakdown can be greatly reduced.

[0043] 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 principle 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 and the lower chamber of the hydraulic cylinder of the shock absorber are respectively connected to solenoid valves. The solenoid valves are connected to two hydraulic accumulators and a reversing valve. The two hydraulic accumulators are respectively connected to the reversing valves. The reversing valves are connected to a hydraulic pump. The height sensor, the solenoid valve, the reversing valve and the hydraulic pump are electrically connected to a controller.

2. The hydraulic interconnected suspension system according to claim 1, characterized in that: The solenoid valve includes a first solenoid valve, a second solenoid valve, a third solenoid valve and a fourth solenoid valve. The upper chamber and the lower chamber of the hydraulic cylinder of the shock absorber of the left front wheel are connected to the first solenoid valve, the upper chamber and the lower chamber of the hydraulic cylinder of the shock absorber of the right front wheel are connected to the second solenoid valve, the upper chamber and the lower chamber of the hydraulic cylinder of the shock absorber of the left rear wheel are connected to the third solenoid valve, the upper chamber and the lower chamber of the hydraulic cylinder of the shock absorber of the right rear wheel are connected to the fourth solenoid valve, the first solenoid valve is cross-connected with the fourth solenoid valve, and the second solenoid valve is cross-connected with the third solenoid valve.

3. The hydraulic interconnected suspension system according to claim 2, characterized in that: The hydraulic accumulator includes a first accumulator, a second accumulator, a third accumulator and a fourth accumulator. The first solenoid valve and the fourth solenoid valve communicate with the first accumulator and the second accumulator. The second solenoid valve and the third solenoid valve communicate with the third accumulator and the fourth accumulator.

4. The hydraulic interconnected suspension system according to claim 3, characterized in that: The reversing valve includes a first reversing valve and a second reversing valve, the first accumulator and the second accumulator are connected to the first reversing valve, and the third accumulator and the fourth accumulator are connected to the second reversing valve.

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

6. The control method of the hydraulic interconnected suspension system according to any one of claims 1 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 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.

Images