Single-shaft hydraulic suspension control device and double-shaft hydraulic suspension control system and multi-shaft hydraulic suspension control system comprising same

Abstract

The invention relates to the technical field of automobile suspensions, in particular to a single-shaft hydraulic suspension control device, a double-shaft hydraulic suspension control system comprising the single-shaft hydraulic suspension control device and a multi-shaft hydraulic suspension control system comprising the single-shaft hydraulic suspension control device. The invention aims to solve the problems of how to ensure the safety, controllability and comfort of drivers and passengers, how to improve the trafficability of a vehicle to various road conditions, how to realize accurate control, how to reduce the cost, how to facilitate maintenance and the like. The shock absorber comprises a shock absorber unit and a hydraulic control unit, the shock absorber unit comprises a first shock absorber and a second shock absorber, the first shock absorber comprises a first shock absorber upper cavity and a first shock absorber lower cavity, the second shock absorber comprises a second shock absorber upper cavity and a second shock absorber lower cavity, and the hydraulic control unit comprises an oil pipeline system, an electric control valve, a hydraulic pump and an oil storage tank. The oil pipeline system comprises a first oil pipe, a second oil pipe and a third oil pipe, and the first oil pipe and the second oil pipe are connected to the two ends of the hydraulic pump respectively. The invention is used for the automobile suspension control system.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile suspension, and in particular relates to a single-axis hydraulic suspension control device and a double-axis hydraulic suspension control system and a multi-axis hydraulic suspension control system containing the device. Background Art

[0002] With the improvement of living standards, people have higher requirements for vehicle functions, and thus higher requirements for vehicle suspension control systems. However, the existing suspension control systems have the following problems:

[0003] 1. When the vehicle is turning, it will generate a large centrifugal force, which will affect the stability of the vehicle body and may even cause rollover in severe cases; 2. When the vehicle brakes suddenly, it will generate a large inertial force and the vehicle will lean forward seriously; 3. When the vehicle has a tire burst while driving, the body of the vehicle will suddenly tilt sideways, causing the vehicle to lose control and easily cause the vehicle to roll over; 4. When passing through a deeply flooded road, the engine will be flooded due to the low chassis, causing the vehicle to malfunction; 5. There are not many means to deal with off-road sections, resulting in poor off-road performance; 6. The tire cannot be replaced when there is no rescue due to a flat tire; 7. There are few active control functions and low control accuracy; 8. The pipeline structure is complex, the durability is poor, and it is difficult to repair, and the cost of subsequent maintenance is high; 9. The degree of modularization is low and the construction cost of the whole vehicle is high.

[0004] Therefore, how to ensure the safety, controllability and comfort of drivers and passengers, how to improve the vehicle's passability in various road conditions, how to achieve precise control, and how to reduce costs and facilitate maintenance have become the main development directions of suspension control systems. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the suspension control system in the prior art, and further provide a single-axis hydraulic suspension control device and a double-axis hydraulic suspension control system and a multi-axis hydraulic suspension control system containing the device. In addition to realizing the left-right balancing function and the same rise and fall function, the device and the system containing the device can also independently control the rise or fall of the single-side shock absorber unit, realize various terrain driving solutions and emergency response solutions, and thus provide effective support for driving safety and vehicle rescue.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a single-axis hydraulic suspension control device includes a shock absorber unit and a hydraulic control unit; the shock absorber unit includes a first shock absorber and a second shock absorber, the first shock absorber includes a first shock absorber upper chamber and a first shock absorber lower chamber, the second shock absorber includes a second shock absorber upper chamber and a second shock absorber lower chamber, the hydraulic control unit includes an oil pipeline system, an electric control valve, a hydraulic pump, and an oil storage tank, the oil pipeline system includes a first oil pipe, a second oil pipe, and a third oil pipe, the first oil pipe and the second oil pipe are respectively connected to both ends of the hydraulic pump;

[0007] The first oil pipe is connected to the upper chamber of the first shock absorber, the second oil pipe is connected to the upper chamber of the second shock absorber, and one end of the third oil pipe is connected to the lower chamber of the first shock absorber, and the other end is connected to the lower chamber of the second shock absorber.

[0008] Furthermore, the oil pipeline system includes a first connecting pipe and a second connecting pipe; one end of the first connecting pipe is connected to the first oil pipe, and the other end is connected to the second oil pipe; one end of the second connecting pipe is connected to the second oil pipe, and the other end is connected to the third oil pipe.

[0009] Furthermore, the connecting pipe is provided with an electrically controlled valve, a DF07 solenoid valve is provided on the first connecting pipe, a DF08 solenoid valve is provided on the second connecting pipe, and a DF06 solenoid valve is provided between the connection between the first connecting pipe and the second oil pipe and between the connection between the second connecting pipe and the second oil pipe.

[0010] Furthermore, the shock absorber unit is provided with an electronically controlled valve, a DF04 solenoid valve is provided at the inlet and outlet of the upper chamber of the first shock absorber, a DF05 solenoid valve is provided at the inlet and outlet of the lower chamber of the first shock absorber, a DF09 solenoid valve is provided at the inlet and outlet of the upper chamber of the second shock absorber, and a DF10 solenoid valve is provided at the inlet and outlet of the lower chamber of the second shock absorber.

[0011] Further, a DF02 solenoid valve is provided at one end of the hydraulic pump, and a DF03 solenoid valve is provided at the other end;

[0012] Furthermore, the pipeline connecting the oil storage tank and the hydraulic pump is a fourth oil pipe, and a DF01 solenoid valve is provided on the fourth oil pipe.

[0013] Furthermore, the hydraulic control unit includes a sensor and a hydraulic system controller; the sensor includes a pressure sensor, a flow sensor, a temperature sensor, a speed sensor, an acceleration sensor, a vehicle posture sensor, a road condition sensor, and a vehicle height sensor;

[0014] After receiving feedback signals from various sensors, the hydraulic system controller makes a judgment and sends instructions to the electronically controlled valves and hydraulic pumps to control the direction of the oil in the pipeline, thereby realizing the hydraulic balancing function and the hydraulic lifting function.

[0015] The present invention provides another technical solution as follows: a dual-axle hydraulic suspension control system, including two sets of single-axle hydraulic suspension control devices, namely a front axle hydraulic suspension control device and a rear axle hydraulic suspension control device.

[0016] Furthermore, the front axle hydraulic suspension control device and the rear axle hydraulic suspension control device are used independently; or a cross-over pipe and an electrically controlled valve are arranged between the front axle hydraulic suspension control device and the rear axle hydraulic suspension control device, and the electrically controlled valve is used to control the on-off of the pipeline, and further control the direction of the oil in the pipeline.

[0017] The present invention provides the following third technical solution: a multi-axis hydraulic suspension control system, including multiple sets of single-axis hydraulic suspension control devices, which are used independently; or multiple sets of single-axis hydraulic suspension control devices are provided with cross-over pipes and electronically controlled valves; or single-axis hydraulic suspension control devices are used independently, and cross-over pipes and electronically controlled valves are provided between the remaining single-axis hydraulic suspension control devices.

[0018] The multi-axle hydraulic suspension control system can be applied to cars with three or more axles, off-road vehicles, engineering vehicles, military vehicles and other special vehicles.

[0019] Further description of the present invention:

[0020] 1. The "axis" in the present invention can be the "axis" of a vehicle in the traditional sense, which is the axial direction of the output shaft, that is, the "horizontal axis"; it can also be a "longitudinal axis", such as the straight line direction where the front and rear shock absorbers are located; it can also be a "cross axis", which can also be defined as the "axis" of the present invention, and then the system of the present invention can be used in the direction of the rotating axis and form different control logics and usage effects.

[0021] 2. In the dual-axle hydraulic suspension control system of the present invention, the system is arranged in a conventional manner, that is, the "horizontal axis", and the optimal use effect is left-right balance; when the system adopts the "vertical axis" arrangement, the optimal use effect is front-back balance, such as Fig.13 The schematic diagram shown in the figure; when the system adopts the "cross axis" layout, the optimal use effect is cross balance, such as Fig.14 Schematic diagram shown.

[0022] 3. In the multi-axle hydraulic suspension control system of the present invention, "multi-axle" means three or more axles, and "multi-set" means three or more sets. The multi-axle hydraulic suspension control system is based on the single-axle hydraulic suspension control system of the present invention and is used in multiple combinations.

[0023] 4. The connection method between the upper and lower chambers of the shock absorber and the oil pipeline system described in the present invention can be associated with the connection of the upper and lower chambers of the shock absorber by switching their positions, which is obvious. Therefore, the connection method of the upper and lower chambers of the shock absorber by switching their positions will not be described in detail in the present invention.

[0024] 5. The present invention can be used in conjunction with the gas-liquid composite shock absorbers of items 1 to 10 in the concurrent applications, and can also be used with existing shock absorbers that conform to the application principles of this system.

[0025] 6. In the single-axis hydraulic suspension control device of the present invention, the hydraulic pump can be a bidirectional hydraulic pump or a unidirectional hydraulic pump. In the present invention, the hydraulic pump is a bidirectional pump. If a unidirectional hydraulic pump is used, a reversing valve connecting the first oil pipe and the second oil pipe needs to be added. This is common knowledge.

[0026] The present invention has the following beneficial technical effects:

[0027] 1. The single-axle hydraulic suspension control device of the present invention has the following beneficial technical effects:

[0028] 1. The advancement and innovation of the pipeline design of the single-axis hydraulic suspension control device of the present invention:

[0029] (1) In the single-axis hydraulic suspension control device of the present invention, the upper chamber of the first shock absorber is connected to the upper chamber of the second shock absorber, and a hydraulic pump is connected in the middle. This connection mode makes the pressure difference between the upper chambers of the first and second shock absorbers zero when static, so that the hydraulic pump does not need to overcome the resistance caused by the pressure difference when controlling the flow of oil, which is more conducive to the rapid operation of the hydraulic pump, shortening the response time, and maintaining the power and starting torque of the motor at the lowest level, which is conducive to reducing the volume of the motor and the volume of the pump, and facilitating installation.

[0030] (2) In the single-axis hydraulic suspension control device of the present invention, the upper chamber of the first shock absorber is connected to the upper chamber of the second shock absorber. When the balancing function of the system is turned on, the hydraulic pump actively adjusts the internal oil of the first and second upper chambers of the shock absorbers to create a pressure difference between the first and second upper chambers of the shock absorbers. The lower chamber of the first shock absorber is connected to the lower chamber of the second shock absorber. Due to the change in the volume of the lower chamber, the oil in the lower chambers of the first and second shock absorbers is synchronously adjusted to achieve the balancing function.

[0031] After the balancing function is completed, the reverse action is performed to reset. After the reset, the initial volume of the internal oil in the upper and lower chambers of the first and second shock absorbers does not change, making the balancing function more accurate and rapid.

[0032] (3) In the single-axis hydraulic suspension control device of the present invention, a connecting pipe and a solenoid valve on the connecting pipe are provided to control the direction of the oil in the pipeline. When the lifting function of the system is turned on, the hydraulic pump injects the oil in the upper chamber of the shock absorber into the lower chamber of the shock absorber through the connecting pipe, or injects the oil in the lower chamber of the shock absorber into the upper chamber of the shock absorber, thereby realizing the single-sided lifting or overall lifting function of the system.

[0033] However, the existing suspension control system capable of realizing the balancing function usually adopts a balancing control cylinder, and the system has complicated piping, many parts, and is inconvenient to install.

[0034] 2. Functions that can be realized by the pipeline design of the single-axle hydraulic suspension control device of the present invention

[0035] (1) Left-up and right-down: Assuming that all the electronically controlled valves are normally closed solenoid valves, when valves DF02, DF03, DF04, DF05, DF06, DF09, and DF10 are opened, the hydraulic pump is turned on to allow the oil to flow from the upper chamber of the second shock absorber to the upper chamber of the first shock absorber, thus realizing the left-up and right-down function in the balancing function.

[0036] (2) Left lowering and right raising: Assuming that all the electronically controlled valves are normally closed solenoid valves, when valves DF02, DF03, DF04, DF05, DF06, DF09, and DF10 are opened, the hydraulic pump is turned on to allow the oil to flow from the upper chamber of the first shock absorber to the upper chamber of the second shock absorber, thus realizing the left lowering and right raising function in the balancing function.

[0037] (3) Left side lifting: Assuming that all the electronically controlled valves are normally closed solenoid valves, open valves DF01, DF02, DF03, DF04, DF05, and DF08, and start the hydraulic pump to allow the oil in the lower chamber of the first shock absorber and the oil tank to flow to the upper chamber of the first shock absorber, thereby realizing the left side lifting function.

[0038] (4) Double-sided lifting: Assuming that all the electronically controlled valves are normally closed solenoid valves, open valves DF01, DF02, DF03, DF04, DF05, DF07, DF08, DF09, and DF10, and start the hydraulic pump to allow the oil in the lower chambers of the first and second shock absorbers and the oil tank to flow to the upper chambers of the first and second shock absorbers, thereby realizing the double-sided lifting function.

[0039] 3. The single-axle hydraulic suspension control device of the present invention can improve the stability and safety of the vehicle

[0040] (1) When the vehicle body rolls due to the inclination of the road surface or tilts due to cornering, the balancing function of the single-axle hydraulic suspension control device of the present invention is used to adjust the vehicle body to maintain a horizontal posture, thereby ensuring the stability of the vehicle body.

[0041] (2) When the road surface is tilted too much or the turning speed is too fast, resulting in a large centrifugal force, the vehicle will be at risk of overturning, causing a serious life-threatening accident. The single-axle hydraulic suspension control device of the present invention can keep the vehicle in a stable state, thereby improving the safety of the vehicle and protecting the life and property of the driver and passengers.

[0042] (3) When a tire on one side bursts and the tire pressure sensor suddenly reaches zero, the vehicle body tends to tilt, which can easily cause the vehicle to roll over. At this time, the single-axle hydraulic suspension control device of the present invention can quickly inject oil into the upper cavity of the shock absorber with the problem, adjust the balance of the vehicle body, effectively prevent the risk of rollover, and ensure the life safety of the driver and passengers.

[0043] 4. The single-axle hydraulic suspension control device of the present invention has active control and precision

[0044] This device is equipped with a hydraulic system controller. When the vehicle enters a complex road or encounters an emergency, the hydraulic system sensor can actively control the vehicle body posture after receiving feedback signals from various signal sensors. A hydraulic pump controls a single-axis hydraulic suspension control device, which can ensure more precise control of the oil volume in the system and avoid uneven oil input under different pressures.

[0045] 5. Expandability of the single-axle hydraulic suspension device of the present invention

[0046] (1) The single-axis hydraulic suspension control device of the present invention can realize the left-right balancing function and the lifting function by itself, thereby providing a modular basic condition for realizing a dual-axis or multi-axis hydraulic suspension control system, making the realization of a dual-axis or multi-axis hydraulic control system simpler and more convenient.

[0047] (2) The single-axis hydraulic suspension control device of the present invention can form a multi-axis hydraulic suspension control system by directly combining multiple independent single-axis hydraulic control devices; it can also be realized by setting a crossover pipe between multiple single-axis hydraulic suspension control devices and adding an electronically controlled valve to realize a multi-axis hydraulic suspension control system with more functions. However, the existing conventional hydraulic control system does not have expandability and modularity.

[0048] 2. Beneficial technical effects of dual-axis or multi-axis hydraulic suspension control systems

[0049] 1. The dual-axle or multi-axle hydraulic suspension control system of the present invention can improve the vehicle's high controllability and comfort:

[0050] (1) When braking, the system transfers the oil in the upper chamber of the rear axle shock absorber to the upper chamber of the front axle shock absorber on the same side to prevent the vehicle body from tilting forward. After braking, the oil transferred to the upper chamber of the front axle shock absorber returns to the original path.

[0051] (2) When turning, the oil in the upper chamber of the shock absorber on one side is input into the upper chamber of the shock absorber on the other side to prevent the vehicle body from tilting. After the turn, the oil input into the upper chamber of the shock absorber on the other side is returned to the original path;

[0052] This balance adjustment method can keep the car body stable, improve the driver's driving experience, and also improve the comfort of the passengers in the car.

[0053] 2. The dual-axle or multi-axle hydraulic suspension system of the present invention can improve the safety of vehicle driving:

[0054] (1) When a vehicle rolls or turns, a large centrifugal force will be generated. In severe cases, the vehicle may overturn, causing a serious life-threatening accident. The present invention can keep the vehicle body in a stable state through the balancing function of the present invention when the centrifugal force is large, thereby greatly improving the safety of the vehicle and protecting the personal and property safety of the driver and passengers.

[0055] (2) When a vehicle passes through a deeply flooded section, if the chassis is too low, water may enter the engine, causing serious engine failure and reducing the safety of the driver and passengers. The lifting function of the present invention can raise the chassis of the vehicle, thereby improving the passability of the vehicle through the flooded section and increasing the safety of the driver and passengers.

[0056] (3) When a tire bursts while a vehicle is driving, the vehicle body suddenly tilts, which can easily cause the vehicle to roll over, threatening the lives of the driver and passengers. The present invention can act quickly after a tire burst, lower the overall height of the vehicle body, and adjust the balance of the vehicle body at the same time, effectively preventing the risk of rollover and ensuring the lives of the driver and passengers.

[0057] 3. The dual-axle or multi-axle hydraulic suspension system of the present invention can improve the durability and energy saving of the hydraulic pump and the electronically controlled valve:

[0058] When the vehicle is driving, the hydraulic suspension system will frequently adjust the body balance according to different road conditions, and the hydraulic pump and the electronic control valve will open and close frequently. The principle of this system in adjusting the balance function is that the oil in the upper chamber of the shock absorber is interconnected. Since the pressure difference in the upper chambers of each shock absorber is small, when adjusting the balance function, the energy consumption required for the hydraulic pump and the electronic control valve to operate is reduced, which extends the service life of the hydraulic pump and the electronic control valve and improves the energy saving of the hydraulic pump and the electronic control valve.

[0059] 4. The dual-axle or multi-axle hydraulic suspension system of the present invention can be modularized and reduce costs:

[0060] This system is based on single-axis hydraulic suspension control and can realize dual-axis hydraulic suspension control systems, as well as three-axis and above hydraulic suspension control systems, simplifying the design difficulty of the hydraulic suspension system and reducing the construction difficulty of vehicle installation; this system can also enable modular production of electronic control components, reducing the cost of subsequent maintenance and servicing.

[0061] 5. The dual-axle or multi-axle hydraulic suspension system of the present invention has active control and precision:

[0062] The dual-axle or multi-axle hydraulic suspension system of the present invention is based on a single-axle hydraulic suspension control system. Each axle is equipped with a single-axle hydraulic suspension control system. Such a multi-axle control system can ensure that the action of each axle is executed more accurately and quickly.

[0063] It avoids the complexity and redundancy of conventional hydraulic control systems, and avoids undesirable phenomena such as interference or delay between actions when performing multiple actions.

[0064] 6. The dual-axle or multi-axle hydraulic suspension system of the present invention can improve the off-road performance of the vehicle:

[0065] (1) When driving out for a picnic, you may encounter various off-road sections and emergencies. This system can be used to control the height and balance of the vehicle body to increase off-road passability. For example, if you encounter a more difficult off-road rock climbing project, this system can be used to control the height difference of the wheels, thereby reducing the distortion of the vehicle body and increasing the tire's ground contact area and ground contact force, making it easier to pass the rock climbing section.

[0066] (2) When a vehicle encounters a flat tire in the wild and there is no rescue, the system can be controlled to lift a single wheel to facilitate repair and tire replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the technical solution of the present invention, the drawings required for the description are briefly introduced below. The drawings of the present invention are only illustrative embodiments and do not limit the present invention.

[0068] Figure 1 The structural principle diagram of the single-axle hydraulic suspension control device of the present invention;

[0069] Figure 2 This is a diagram of the oil circuit of the single-axle hydraulic suspension control device - left-up and right-down of the present invention;

[0070] Figure 3 This is a diagram of the oil circuit for double-side lifting of a single-axle hydraulic suspension control device of the present invention;

[0071] Figure 4 This is a diagram of the left side lifting oil circuit of the single-axle hydraulic suspension control device of the present invention;

[0072] Figure 5 This is a diagram of the oil circuit for the right side elevation of the single-axle hydraulic suspension control device of the present invention;

[0073] Figure 6 It is a structural principle diagram of the dual-axle hydraulic suspension control system of the present invention;

[0074] Figure 7 This is the oil circuit diagram of the dual-axle hydraulic suspension control system - front lifting and rear lowering of the invention;

[0075] Figure 8 This is a diagram of the oil path of the front axle rising of the dual-axle hydraulic suspension control system of the present invention;

[0076] Fig. 9 This is a diagram of the oil path for the dual-axle hydraulic suspension control system of the present invention - the whole vehicle ascending path;

[0077] Fig.10 The structural principle of the multi-axis hydraulic suspension control system of the present invention Figure 1 ;

[0078] Fig.11 The structural principle of the multi-axis hydraulic suspension control system of the present invention Figure 2 ;

[0079] Fig.12 The structural principle of the multi-axis hydraulic suspension control system of the present invention Figure 3 ;

[0080] Fig.13 It is a structural schematic diagram of another dual-axle hydraulic suspension control system of the present invention;

[0081] Fig.14 It is a schematic structural diagram of a third dual-axle hydraulic suspension control system of the present invention;

[0082] Fig.15 The dual-axle system vehicle body control logic comparison table of the present invention;

[0083] In the figure: 11, first shock absorber; 111, first shock absorber upper chamber; 112, first shock absorber lower chamber; 12, second shock absorber; 121, second shock absorber upper chamber; 122, second shock absorber lower chamber;

[0084] 21. Oil pipeline system; 211. First oil pipeline; 212. Second oil pipeline; 213. Third oil pipeline; 214. Fourth oil pipeline; 215. First connecting pipe; 216. Second connecting pipe;

[0085] Oil pipeline system A; 2111, first oil pipe A; 2121, second oil pipe A; 2131, third oil pipe A; 2141, fourth oil pipe A; 2151, first connecting pipe A; 2161, second connecting pipe A;

[0086] Oil pipeline system B; 2112, first oil pipe B; 2122, second oil pipe B; 2132, third oil pipe B; 2142, fourth oil pipe B; 2152, first connecting pipe B; 2162, second connecting pipe B;

[0087] Oil pipeline system C; 2113, first oil pipe C; 2123, second oil pipe C; 2133, third oil pipe C; 2143, fourth oil pipe C; 2153, first connecting pipe B; 2163, second connecting pipe C;

[0088] 22. Electric control valve; 2201, DF01 solenoid valve; 2202, DF02 solenoid valve; 2203, DF03 solenoid valve; 2204, DF04 solenoid valve; 2205, DF05 solenoid valve; 2206, DF06 solenoid valve; 2207, DF07 solenoid valve; 2208, DF08 solenoid valve; 2209, DF09 solenoid valve; 2210, DF10 solenoid valve;

[0089] 2211, DF11 solenoid valve; 2212, DF12 solenoid valve; 2213, DF13 solenoid valve; 2214, DF14 solenoid valve; 2215, DF15 solenoid valve; 2216, DF16 solenoid valve; 2217, DF17 solenoid valve; 2218, DF18 solenoid valve; 2219, DF19 solenoid valve; 2220, DF20 solenoid valve;

[0090] 2221, DF21 solenoid valve; 2222, DF22 solenoid valve; 2223, DF23 solenoid valve; 2224, DF24 solenoid valve; 2225, DF25 solenoid valve; 2226, DF26 solenoid valve; 2227, DF27 solenoid valve;

[0091] 23. Hydraulic pump; 231. Hydraulic pump A; 232. Hydraulic pump B; 233. Hydraulic pump C; 24. Oil storage tank; 25. Sensor; 251. Pressure sensor; 252. Flow sensor; 253. Temperature sensor;

[0092] 26. Crossing tube; 261. First crossing tube; 262. Second crossing tube; 263. Third crossing tube; 264. Fourth crossing tube; 265. Fifth crossing tube; 266. Sixth crossing tube; 267. Seventh crossing tube; 268. Eighth crossing tube; 269. Ninth crossing tube; 2610. Tenth crossing tube. DETAILED DESCRIPTION

[0093] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0094] Specific implementation method 1: Combination Figures 1 to 5 The present embodiment is described. In the embodiment, a single-axis hydraulic suspension control device includes a shock absorber unit and a hydraulic control unit. The shock absorber unit includes a first shock absorber 11 and a second shock absorber 12. The first shock absorber 11 includes a first shock absorber upper chamber 111 and a first shock absorber lower chamber 112. The second shock absorber 12 includes a second shock absorber upper chamber 121 and a second shock absorber lower chamber 122. The hydraulic control unit includes an oil pipeline system 21, an electric control valve 22, a hydraulic pump 23, and an oil storage tank 24. The oil pipeline system 21 includes a first oil pipeline 211, a second oil pipeline 212, and a third oil pipeline 213. The first oil pipeline 211 and the second oil pipeline 212 are connected to both ends of the hydraulic pump 23, respectively.

[0095] The first oil pipe 211 is connected to the first shock absorber upper chamber 111 , the second oil pipe 212 is connected to the second shock absorber upper chamber 121 , and one end of the third oil pipe 213 is connected to the first shock absorber lower chamber 112 , and the other end is connected to the second shock absorber lower chamber 122 .

[0096] In a preferred embodiment, the oil pipeline system 21 includes a first connecting pipe 215 and a second connecting pipe 216; one end of the first connecting pipe 215 is connected to the first oil pipe 211, and the other end is connected to the second oil pipe 212; one end of the second connecting pipe 216 is connected to the second oil pipe 212, and the other end is connected to the third oil pipe 213;

[0097] In a preferred embodiment, the connecting pipe is provided with an electric-controlled valve 22, a DF07 solenoid valve 2207 is provided on the first connecting pipe 215, a DF08 solenoid valve 2208 is provided on the second connecting pipe 216, and a DF06 solenoid valve 2206 is provided between the connection between the first connecting pipe 215 and the second oil pipe 212 and between the connection between the second connecting pipe 216 and the second oil pipe 212.

[0098] In a preferred embodiment, the shock absorber unit is provided with an electric control valve 22, a DF04 solenoid valve 2204 is provided at the outlet of the first shock absorber upper chamber 111, a DF05 solenoid valve 2205 is provided at the outlet of the first shock absorber lower chamber 112, a DF09 solenoid valve 2209 is provided at the outlet of the second shock absorber upper chamber 121, and a DF10 solenoid valve 2210 is provided at the outlet of the second shock absorber lower chamber 122;

[0099] In a preferred embodiment, a DF02 solenoid valve 2202 is provided at one end of the hydraulic pump 23, and a DF03 solenoid valve 2203 is provided at the other end.

[0100] In a preferred embodiment, the pipeline connecting the oil storage tank 24 and the hydraulic pump 23 is a fourth oil pipe 214 , and a DF01 solenoid valve 2201 is provided on the fourth oil pipe 214 .

[0101] In a preferred embodiment, the hydraulic control unit includes a sensor 25 and a hydraulic system controller; the sensor 25 includes a pressure sensor 251, a flow sensor 252, a temperature sensor 253, a speed sensor, an acceleration sensor, a vehicle posture sensor, a road condition sensor, and a vehicle height sensor; the hydraulic system controller receives feedback signals from each sensor, makes a judgment, and sends instructions to the electronically controlled valve 22 and the hydraulic pump 23 to control the direction of the oil in the pipeline, thereby realizing the hydraulic balancing function and the hydraulic lifting function.

[0102] Description of the hydraulic pump:

[0103] In the single-axis hydraulic suspension control system of the present invention, the hydraulic pump can be a bidirectional hydraulic pump or a unidirectional hydraulic pump. In the present embodiment, the hydraulic pump is a bidirectional pump. If a unidirectional hydraulic pump is used, a reversing valve connecting the first oil pipe and the second oil pipe needs to be added. This is common knowledge and is no longer reflected in the present embodiment.

[0104] Combination Figure 2 , specifically explain the functions that can be achieved by this system: Assume that the solenoid valves DF01 to DF10 in this system are all normally closed solenoid valves, open DF02, DF03, DF04, DF05, DF06, DF09, and DF10, turn on the hydraulic pump, and let the oil flow from the upper chamber of the second shock absorber to the upper chamber of the first shock absorber, and the lower chamber of the second shock absorber is connected to the lower chamber of the first shock absorber, realizing the function of left rise and right fall.

[0105] Combination Figure 3 , specifically explain the functions that can be achieved by this system: Assume that the solenoid valves DF01 to DF10 in this system are all normally closed solenoid valves, open DF01, DF02, DF03, DF04, DF05, DF07, DF08, DF09, and DF10, turn on the hydraulic pump, and make the oil in the lower chamber of the first and second shock absorbers and the oil in the oil storage tank flow to the upper chamber of the first and second shock absorbers, thereby realizing the function of bilateral lifting.

[0106] Combination Figure 4, specifically explain the functions that can be achieved by this system: Assume that the solenoid valves DF01 to DF10 of this system are all normally closed solenoid valves, open DF01, DF02, DF03, DF04, DF05, and DF08, turn on the hydraulic pump, and make the oil in the lower chamber of the first shock absorber and the oil in the oil storage tank flow to the upper chamber of the first shock absorber, thereby realizing the function of raising the left side.

[0107] Combination Figure 5 , specifically explain the functions that this system can achieve: Assume that the solenoid valves DF01 to DF10 of this system are all normally closed solenoid valves, open DF01, DF02, DF03, DF07, DF08, DF09, and DF10, turn on the hydraulic pump, and make the oil in the lower chamber of the second shock absorber and the oil in the oil storage tank flow to the upper chamber of the second shock absorber, thereby realizing the function of raising the right side.

[0108] Specific implementation method 2: Combination Figures 6 to 9 , Fig.15 To describe this embodiment, a dual-axle hydraulic suspension control system includes two sets of single-axle hydraulic suspension control devices, namely a front axle hydraulic suspension control device and a rear axle hydraulic suspension control device.

[0109] In a preferred embodiment, a dual-axle hydraulic suspension control system includes a cross-over tube and an electrically controlled valve; the cross-over tube 26 is arranged between the front axle hydraulic suspension control device and the rear axle hydraulic suspension control device, and the electrically controlled valve is used to control the on-off of the pipeline, thereby controlling the direction of the oil in the pipeline.

[0110] Description of the crossover tube for the dual-axle hydraulic suspension control system:

[0111] The crossover tube 26 is used to connect the parallel single-axis hydraulic suspension control devices, so as to realize various functions of the dual-axis hydraulic suspension control system. Due to the different number of crossover tubes 26, the connection method is also different. Figure 6 It is explained that this embodiment only provides a relatively simple connection method of the cross-over tube 26. A first cross-over tube 261, a second cross-over tube 262 and a third cross-over tube 263 are arranged between the two single-axis hydraulic suspension control systems. Other connection methods are within the protection scope of the present invention.

[0112] Combination Figure 6 This embodiment includes two single-axle hydraulic suspension control systems, namely, a front axle hydraulic suspension control device and a rear axle hydraulic suspension control device. In this embodiment, the "double-axle" layout principle of conventional vehicles, that is, the "transverse axis" layout, is adopted.

[0113] The front axle hydraulic suspension control device is provided with an oil pipeline system A, the first oil pipe A2111 is connected to the first shock absorber upper chamber 111, the second oil pipe A2121 is connected to the second shock absorber upper chamber 121, one end of the third oil pipe A2131 is connected to the first shock absorber lower chamber 112, and the other end is connected to the second shock absorber lower chamber 122; one end of the first connecting pipe A2151 is connected to the first oil pipe A2111, and the other end is connected to the second oil pipe A2121; one end of the second connecting pipe A2161 is connected to the second oil pipe A2121, and the other end is connected to the third oil pipe A2131; the pipeline connecting the oil storage tank 24 and the hydraulic pump A231 is the fourth oil pipe A2141.

[0114] The rear axle hydraulic suspension control device is provided with an oil pipeline system B, the first oil pipe B2112 is connected to the first shock absorber upper chamber 111, the second oil pipe B2122 is connected to the second shock absorber upper chamber 121, one end of the third oil pipe B2132 is connected to the first shock absorber lower chamber 112, and the other end is connected to the second shock absorber lower chamber 122; one end of the first connecting pipe B2152 is connected to the first oil pipe B2112, and the other end is connected to the second oil pipe B2122; one end of the second connecting pipe B2162 is connected to the second oil pipe B2122, and the other end is connected to the third oil pipe B2132; the pipeline connecting the oil storage tank 24 and the hydraulic pump B232 is the fourth oil pipe B2142.

[0115] Explanation of the names of shock absorbers for the dual-axle hydraulic suspension control system:

[0116] The “first shock absorber” expressed in the front axle hydraulic suspension control device in this embodiment may represent the left front shock absorber of the vehicle; and the “second shock absorber” may represent the right front shock absorber of the vehicle.

[0117] The “first shock absorber” expressed in the rear axle hydraulic suspension control device in this embodiment may represent the left rear shock absorber of the vehicle; and the “second shock absorber” may represent the right rear shock absorber of the vehicle.

[0118] Combination Figure 7 , specifically explain the functions that can be achieved by this system: Assume that the solenoid valves DF01 to DF27 of this system are all normally closed solenoid valves, open DF02, DF03, DF04, DF08, DF14, and DF24, and turn on the front axle hydraulic pump 231, so that the oil in the upper chamber of the left rear shock absorber flows to the upper chamber of the left front shock absorber; open DF09, DF12, DF13, DF17, DF18, DF22, DF26, and DF27, and turn on the rear axle hydraulic pump 232, so that the oil in the upper chamber of the right rear shock absorber flows to the upper chamber of the right front shock absorber, thereby realizing the front-lift and rear-lowering function.

[0119] Combination Figure 8, specifically explain the functions that can be achieved by this system: Assume that the solenoid valves DF01 to DF27 of this system are all normally closed solenoid valves, open DF01, DF02, DF03, DF04, DF05, and DF08, and turn on the front axle hydraulic pump 231, so that the oil in the lower chamber of the left front shock absorber and the oil in the oil storage tank flow to the upper chamber of the left front shock absorber; open DF09, DF10, DF11, DF12, DF13, DF17, DF18, DF22, DF25, and DF26, and turn on the rear axle hydraulic pump 232, so that the oil in the lower chamber of the right front shock absorber and the oil in the oil storage tank flow to the upper chamber of the left front shock absorber, thereby realizing the front axle lifting function.

[0120] Combination Fig. 9 , specifically explain the functions that can be achieved by this system: Assume that all the solenoid valves DF01 to DF27 of this system are normally closed solenoid valves, open DF01, DF02, DF03, DF04, DF05, DF07, DF08, DF09, DF10, and DF21, and turn on the front axle hydraulic pump 231, so that the oil in the lower chamber of the left front and right front shock absorbers and the oil in the oil storage tank flow to the upper chamber of the left front and right front shock absorbers; open DF11, DF12, DF13, DF14, DF15, DF17, DF18, DF19, DF20, DF22, and DF23, and turn on the rear axle hydraulic pump 232, so that the oil in the lower chamber of the left rear and right rear shock absorbers and the oil in the oil storage tank flow to the upper chamber of the left rear and right rear shock absorbers, thereby realizing the function of lifting the entire vehicle.

[0121] Combination Fig.15 , is a comparison table of the body control logic of the dual-axle system. Based on this table, the functions that can be achieved by the dual-axle system can be specifically explained.

[0122] Other components and connection relationships are the same as those in the first specific implementation mode.

[0123] Specific implementation method three: Combination Figures 10 to 12 To illustrate this embodiment, a multi-axle hydraulic suspension control system includes multiple sets of single-axle hydraulic suspension control devices, which are used in combination. In this embodiment, the combined use of three sets of single-axle hydraulic suspension devices is taken as an example:

[0124] Fig.10 This is the piping diagram for the three sets of single-axle hydraulic suspension devices, all used independently;

[0125] Fig.11 The piping diagram is for one set of single-axle hydraulic suspension device to be used independently, and the other two sets of single-axle hydraulic suspension devices to be used in combination;

[0126] Fig.12 This is a piping diagram for the combined use of three sets of single-axle hydraulic suspension devices.

[0127] Description of the crossover tube for the multi-axis hydraulic suspension control system:

[0128] The crossover tube 26 is used to connect the parallel single-axis hydraulic suspension control devices, so as to realize various functions of the multi-axis hydraulic suspension control device. Due to the different number of crossover tubes 26, the connection method is also different. Fig.11 It is explained that this embodiment only provides a relatively simple connection method of the cross-over tube 26. A fourth cross-over tube 264, a fifth cross-over tube 265 and a sixth cross-over tube 266 are arranged between the three sets of single-axis hydraulic suspension control devices. Other connection methods are within the protection scope of the present invention.

[0129] The crossover tube 26 is used to connect the parallel single-axis hydraulic suspension control devices, so as to realize various functions of the multi-axis hydraulic suspension control system. Due to the different number of crossover tubes 26, the connection method is also different. Fig.12 It is explained that this embodiment only provides a relatively simple connection method of the crossing tube 26. The seventh crossing tube 267, the eighth crossing tube 268, the ninth crossing tube 269 and the tenth crossing tube 2610 are arranged between the three sets of single-axis hydraulic suspension control devices. Other connection methods are within the protection scope of the present invention.

[0130] Combination Figure 10-12 The present embodiment includes three sets of single-axle hydraulic suspension control devices, namely a one-axle hydraulic suspension control device, a two-axle hydraulic suspension control device and a three-axle hydraulic suspension control device.

[0131] The single-axle hydraulic suspension control device is provided with an oil pipeline system A, wherein the first oil pipe A2111 is connected to the first shock absorber upper chamber 111, the second oil pipe A2121 is connected to the second shock absorber upper chamber 121, one end of the third oil pipe A2131 is connected to the first shock absorber lower chamber 112, and the other end is connected to the second shock absorber lower chamber 122; one end of the first connecting pipe A2151 is connected to the first oil pipe A2111, and the other end is connected to the second oil pipe A2121; one end of the second connecting pipe A2161 is connected to the second oil pipe A2121, and the other end is connected to the third oil pipe A2131; the pipeline connecting the oil storage tank 24 and the hydraulic pump A231 is the fourth oil pipe A2141.

[0132] The two-axle hydraulic suspension control device is provided with an oil pipeline system B, the first oil pipe B2112 is connected to the first shock absorber upper chamber 111, the second oil pipe B2122 is connected to the second shock absorber upper chamber 121, one end of the third oil pipe B2132 is connected to the first shock absorber lower chamber 112, and the other end is connected to the second shock absorber lower chamber 122; one end of the first connecting pipe B2152 is connected to the first oil pipe B2112, and the other end is connected to the second oil pipe B2122; one end of the second connecting pipe B2162 is connected to the second oil pipe B2122, and the other end is connected to the third oil pipe B2132; the pipeline connecting the oil storage tank 24 and the hydraulic pump B232 is the fourth oil pipe B2142.

[0133] The three-axis hydraulic suspension control device is provided with an oil pipeline system C, the first oil pipe C2113 is connected to the first shock absorber upper chamber 111, the second oil pipe C2123 is connected to the second shock absorber upper chamber 121, one end of the third oil pipe C2133 is connected to the first shock absorber lower chamber 112, and the other end is connected to the second shock absorber lower chamber 122; one end of the first connecting pipe C2153 is connected to the first oil pipe C2113, and the other end is connected to the second oil pipe C2123; one end of the second connecting pipe C2163 is connected to the second oil pipe C2123, and the other end is connected to the third oil pipe C2133; the pipeline connecting the oil storage tank 24 and the hydraulic pump C233 is the fourth oil pipe C2143.

[0134] In this embodiment, the electronically controlled valve is used to control the on-off of the pipeline, and then control the direction of the oil in the pipeline. The second specific implementation method has explained in detail the multiple solenoid valves used in the dual-axle hydraulic suspension control system, which will not be repeated here.

[0135] Explanation of the names of shock absorbers for multi-axis hydraulic suspension control systems:

[0136] The “first shock absorber” expressed in the single-axle hydraulic suspension control device in this embodiment may represent the left front shock absorber of the vehicle; and the “second shock absorber” may represent the right front shock absorber of the vehicle.

[0137] The “first shock absorber” expressed in the two-axle hydraulic suspension control device in this embodiment may represent the left center shock absorber of the vehicle; and the “second shock absorber” may represent the right center shock absorber of the vehicle.

[0138] The “first shock absorber” expressed in the three-axis hydraulic suspension control device in this embodiment may represent the left rear shock absorber of the vehicle; and the “second shock absorber” may represent the right rear shock absorber of the vehicle.

[0139] The other components and connection relationships are the same as those of the first and second specific implementation modes.

[0140] Specific implementation method four: Combination Fig.13To describe the present embodiment, this dual-axle hydraulic suspension control system adopts a "longitudinal axis" arrangement with a cross-over pipe and an electronically controlled valve.

[0141] Combination Figure 7 The middle is the "horizontal axis" layout, and the functions that can be realized are: assuming that the solenoid valves DF01 to DF27 of this system are all normally closed solenoid valves, open DF02, DF03, DF04, DF08, DF14, and DF24, and turn on the front axle hydraulic pump 231, so that the oil in the upper chamber of the left rear shock absorber flows to the upper chamber of the left front shock absorber; open DF09, DF12, DF13, DF17, DF18, DF22, DF26, and DF27, and turn on the rear axle hydraulic pump 232, so that the oil in the upper chamber of the right rear shock absorber flows to the upper chamber of the right front shock absorber, thereby realizing the front-lift and rear-lowering functions.

[0142] Combination Fig.13 The middle is the "vertical axis" layout, and the functions that can be realized are: assuming that the solenoid valves DF01 to DF27 of this system are all normally closed solenoid valves, open DF02, DF03, DF04, DF08, DF14, and DF24, and turn on hydraulic pump 231, so that the oil in the upper chamber of the right rear shock absorber flows to the upper chamber of the left rear shock absorber; open DF09, DF12, DF13, DF17, DF18, DF22, DF26, and DF27, and turn on hydraulic pump 232, so that the oil in the upper chamber of the right front shock absorber flows to the upper chamber of the left front shock absorber, realizing the left-up and right-down function.

[0143] Combined with the above routing and function comparison, when the dual-axle hydraulic suspension control system adopts the "horizontal axis" or "vertical axis" layout, because the system itself has not changed, the action is the same, and the direction of action has changed, for example Figure 7 and Fig.13 As shown, it changes from "rising in front and falling in the back" to "rising on the left and falling on the right".

[0144] Description of the crossover tube for the multi-axis hydraulic suspension control system:

[0145] The crossover tube is used to connect the parallel single-axis hydraulic suspension control devices, so as to realize the various functions of the dual-axis hydraulic suspension control system. Due to the different number of crossover tubes, the connection method is also different. Fig.13 It is explained that this embodiment only provides a relatively simple cross-over pipe connection method, and other connection methods are within the protection scope of the present invention.

[0146] The other components and connection relationships are the same as those of the first and second specific implementation modes.

[0147] Specific implementation method five: Combination Fig.14To describe this embodiment, this dual-axle hydraulic suspension control system adopts a "cross-axle" arrangement with a cross-over pipe and an electronically controlled valve. For the specific principle of realizing the function, reference may be made to the fourth embodiment.

[0148] Description of the crossover tube for the multi-axis hydraulic suspension control system:

[0149] The crossover tube is used to connect the parallel single-axis hydraulic suspension control devices, so as to realize the various functions of the multi-axis hydraulic suspension control system. Due to the different number of crossover tubes, the connection method is also different. Fig.14 It is explained that this embodiment only provides a relatively simple cross-over pipe connection method, and other connection methods are within the protection scope of the present invention.

[0150] The other components and connection relationships are the same as those of the first, second and fourth embodiments.

[0151] Working principle of the present invention:

[0152] In the hydraulic suspension control system of the present invention, the feedback signal of the vehicle sensor or the command signal of the active control is processed by the hydraulic system control analysis, and by controlling the opening and closing of the solenoid valve and the start and close of the hydraulic pump, active and precise control of the vehicle posture such as single-wheel lifting, whole vehicle lifting, maintaining vehicle balance when cornering, and braking to cause the vehicle body to tilt forward is achieved.

[0153] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A single-axis hydraulic suspension control device, characterized in that: The invention comprises a shock absorber unit and a hydraulic control unit; the shock absorber unit comprises a first shock absorber (11) and a second shock absorber (12); the first shock absorber (11) comprises a first shock absorber upper chamber (111) and a first shock absorber lower chamber (112); the second shock absorber (12) comprises a second shock absorber upper chamber (121) and a second shock absorber lower chamber (122); the hydraulic control unit comprises an oil pipeline system (21), an electric control valve (22), a hydraulic pump (23), and an oil storage tank (24); the oil pipeline system (21) comprises a first oil pipeline (211), a second oil pipeline (212), and a third oil pipeline (213); the first oil pipeline (211) and the second oil pipeline (212) are respectively connected to two ends of the hydraulic pump (23); The first oil pipe (211) is connected to the upper chamber (111) of the first shock absorber, the second oil pipe (212) is connected to the upper chamber (121) of the second shock absorber, and one end of the third oil pipe (213) is connected to the lower chamber (112) of the first shock absorber, and the other end is connected to the lower chamber (122) of the second shock absorber.

2. The single-axis hydraulic suspension control device according to claim 1, characterized in that: The oil pipeline system (21) comprises a first connecting pipe (215) and a second connecting pipe (216); One end of the first connecting pipe (215) is connected to the first oil pipe (211), and the other end is connected to the second oil pipe (212); One end of the second connecting pipe (216) is connected to the second oil pipe (212), and the other end is connected to the third oil pipe (213).

3. The single-axis hydraulic suspension control device according to claim 2, characterized in that: The connecting pipe is provided with an electric control valve (22), the first connecting pipe (215) is provided with a DF07 solenoid valve (2207), the second connecting pipe (216) is provided with a DF08 solenoid valve (2208), and a DF06 solenoid valve (2206) is provided between the connection point between the first connecting pipe (215) and the second oil pipe (212) and between the connection point between the second connecting pipe (216) and the second oil pipe (212).

4. The single-axis hydraulic suspension control device according to claim 1, characterized in that: The shock absorber unit is provided with an electric control valve (22); a DF04 solenoid valve (2204) is provided at the inlet and outlet of the first shock absorber upper chamber (111); a DF05 solenoid valve (2205) is provided at the inlet and outlet of the first shock absorber lower chamber (112); a DF09 solenoid valve (2209) is provided at the inlet and outlet of the second shock absorber upper chamber (121); and a DF10 solenoid valve (2210) is provided at the inlet and outlet of the second shock absorber lower chamber (122).

5. The single-axis hydraulic suspension control device according to claim 1, characterized in that: A DF02 solenoid valve (2202) is provided at one end of the hydraulic pump (23), and a DF03 solenoid valve (2203) is provided at the other end.

6. The single-axis hydraulic suspension control device according to claim 1, characterized in that: The pipeline connecting the oil storage tank (24) and the hydraulic pump (23) is a fourth oil pipe (214), and a DF01 solenoid valve (2201) is provided on the fourth oil pipe (214).

7. The single-axis hydraulic suspension control device according to claim 1, characterized in that: The hydraulic control unit comprises a sensor (25) and a hydraulic system controller; the sensor (25) comprises a pressure sensor (251), a flow sensor (252), a temperature sensor (253), a speed sensor, an acceleration sensor, a vehicle posture sensor, a road surface condition sensor and a vehicle height sensor; The hydraulic system controller receives feedback signals from various sensors, makes a judgment and sends instructions to the electronically controlled valve (22) and the hydraulic pump (23) to control the direction of the oil in the pipeline, thereby realizing the hydraulic balancing function and the hydraulic lifting function.

8. A dual-axle hydraulic suspension control system, characterized in that: It comprises two sets of single-axle hydraulic suspension control devices as described in any one of claims 1 to 7, namely a front axle hydraulic suspension control device and a rear axle hydraulic suspension control device.

9. The dual-axle hydraulic suspension control system according to claim 8, characterized in that: The front axle hydraulic suspension control device and the rear axle hydraulic suspension control device are used independently; Or a crossover pipe (26) and an electric control valve are arranged between the front axle hydraulic suspension control device and the rear axle hydraulic suspension control device, and the electric control valve is used to control the on-off of the pipeline, thereby controlling the direction of the oil in the pipeline.

10. A multi-axis hydraulic suspension control system, characterized in that: Comprising a plurality of single-axle hydraulic suspension control devices as claimed in any one of claims 1 to 7, wherein the plurality of single-axle hydraulic suspension control devices are used independently; Or a plurality of sets of single-axis hydraulic suspension control devices are provided with a crossover pipe (26) and an electric control valve; Or a single-axis hydraulic suspension control device is used independently, and a crossover pipe (26) and an electric control valve are arranged between the other single-axis hydraulic suspension control devices; The multi-axle hydraulic suspension control device can be applied to cars with three or more axles, off-road vehicles, engineering vehicles, military vehicles and other special vehicles.

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