Active hydraulic lifting control system

Abstract

The present invention belongs to the technical field of hydraulic control systems, and discloses an active hydraulic lifting control system, including a fuel tank, a shock absorber unit, a central control unit, a sensor unit and a drive unit; the fuel tank is used to store hydraulic oil; there are four shock absorber units, which are supported at four wheels of the vehicle respectively; the central control unit is used to send a start-stop signal of the control system; the sensor unit is used to detect the ground clearance at the four wheels and / or the driving posture of the vehicle, and output a first control signal based on the ground clearance and / or the driving posture; the drive unit outputs the hydraulic oil in the fuel tank based on the start-stop signal, and controls the flow of the hydraulic oil according to the first control signal to drive the shock absorber unit to achieve lifting movement or position maintenance; the sensor unit is used to detect the driving posture of the vehicle, including at least the steering wheel angle, the brake state, the throttle state, and the vehicle speed. The present invention can adapt to different working conditions and realize the active adjustment of the damping force of the shock absorber according to different signals.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic control systems, and in particular relates to an active hydraulic lifting control system. Background Art

[0002] The current shock absorbers mainly include passive shock absorbers, semi-active shock absorbers and active shock absorbers.

[0003] After the passive shock absorber is assembled, its damping force cannot be adjusted; the semi-active shock absorber can only adjust the size of the damping force, and the degree of freedom is not high; the active shock absorber can automatically control the damping force and force direction of the shock absorber according to actual information, thereby increasing the comfort of the user.

[0004] Therefore, under the premise of pursuing comfort, the demand for active shock absorbers is far greater than that for passive shock absorbers and semi-active shock absorbers. Summary of the invention

[0005] In order to solve the above technical problems, the present invention discloses an active hydraulic lifting control system, which can adapt to different working conditions and realize active adjustment of the damping force of the shock absorber according to different signals. The specific technical solution of the present invention is as follows:

[0006] An active hydraulic lifting control system, comprising:

[0007] Oil tank, used to store hydraulic oil;

[0008] A shock absorber unit, wherein the shock absorber units are four and are respectively supported at four wheels of the vehicle;

[0009] The central control unit is used to send start and stop signals of the control system;

[0010] a sensing unit, configured to detect the ground clearance at four wheels and / or the driving posture of the vehicle, and output a first control signal based on the ground clearance and / or the driving posture; and

[0011] A driving unit, wherein the driving unit outputs the hydraulic oil in the oil tank based on the start-stop signal and controls the flow rate of the hydraulic oil according to the first control signal to drive the shock absorber unit to achieve lifting movement or position maintenance;

[0012] The sensing unit is used to detect the driving posture of the vehicle, including at least the steering wheel angle, brake status, throttle status, and vehicle speed.

[0013] The central control unit cooperates with the sensor unit to directly control the drive unit to meet the needs of rapid adjustment of the shock absorber unit, wherein the sensor unit uses at least the steering wheel angle, brake status, throttle status, vehicle speed, and ground height as variable references to achieve diversified hydraulic flow control, thereby achieving damping force adjustment of the shock absorber unit.

[0014] Preferably, the four wheels are two wheels at the front end of the vehicle and two wheels at the rear end of the vehicle;

[0015] One of the wheels at the front end of the vehicle and one of the wheels at the rear end of the vehicle are located on one side of the vehicle, and another wheel at the front end of the vehicle and another wheel at the rear end of the vehicle are located on the other side of the vehicle;

[0016] The first control signal includes:

[0017] A first signal output based on detecting the ground clearance at four wheels and / or the driving posture of the vehicle;

[0018] The driving unit comprises:

[0019] a pump assembly, wherein the pump assembly enables the hydraulic oil in the oil tank to obtain flow power based on the start-stop signal and causes the hydraulic oil to flow toward the shock absorber unit;

[0020] A central control cylinder that balances the hydraulic oil pressure between the shock absorber units connected at all four wheels; and

[0021] A gate valve, wherein the gate valve is switched based on a first signal;

[0022] The shock absorber units connected to the two wheels at either end of the vehicle are connected via a gate valve.

[0023] After the control system is started, the pump assembly draws the hydraulic oil from the oil tank; during this process, the control system determines the stability between the wheels of the vehicle through the sensor unit. Based on the hydraulic conditions, if the detection result of the sensor unit differs from the preset state, the gate valve switch is controlled by the first signal to achieve balance adjustment of the wheels at the same end of the vehicle. At the same time, through the setting of the central control cylinder, balance adjustment of the four wheels is achieved.

[0024] Preferably, the first control signal further includes:

[0025] A second signal output based on detecting the ground clearance at four wheels and / or the driving posture of the vehicle;

[0026] The driving unit further comprises:

[0027] A leveling valve, wherein the leveling valve is switched based on a second signal;

[0028] The shock absorber unit and the pump assembly connected to any wheel are connected through a leveling valve.

[0029] The leveling valve is opened or closed based on the second signal, so that oil is fed into the shock absorber unit, and the flow rate of the hydraulic oil can be adjusted by switching the leveling valve.

[0030] Preferably, the sensing unit is also used to detect the flow pressure of the hydraulic oil and output a pressure signal based on the flow pressure;

[0031] The pump assembly also adjusts the flow dynamics of the hydraulic oil based on the pressure signal.

[0032] When the sensing unit detects the flow pressure of the hydraulic oil, it is fed back to the pump assembly to achieve power regulation of the hydraulic oil, thereby achieving flow regulation of the hydraulic oil.

[0033] Preferably, the central control cylinder has four independent fluid chambers and a floating valve arranged in the middle of the central control cylinder;

[0034] Each fluid chamber is connected to a corresponding damper unit;

[0035] The shock absorber units connected to the two wheels on the same side of the vehicle adjust the hydraulic oil pressure between their corresponding fluid chambers through a float valve.

[0036] Since the central control cylinder has a floating valve, when the balance between the vehicle wheels is insufficient, the floating valve automatically adjusts its position according to the pressure difference in different fluid chambers, thereby satisfying the hydraulic oil pressure regulation between the shock absorber units connected to the wheels.

[0037] Preferably, the first control signal further includes:

[0038] A third signal output based on detecting the ground clearance at four wheels and / or the driving posture of the vehicle;

[0039] The driving unit further comprises:

[0040] an accumulator for storing excess pressurized fluid supplied by the pump assembly; and

[0041] An oil return pipeline, the oil return pipeline is arranged between the oil tank and the accumulator and is connected to the oil tank;

[0042] Wherein, the oil return pipeline is provided with a safety valve, and the safety valve realizes pressure relief of the control system based on the third signal.

[0043] When the hydraulic oil pressure in the pipeline is too high, the safety valve opens based on the third signal to release the system pressure to protect the system, thereby avoiding system failure; the accumulator can store excess pressurized oil in the control system and release the excess pressurized oil for use by the system when needed, thereby reducing pressure shocks and pressure pulsations; at the same time, the accumulator can ensure the normal operation of the system, improve dynamic quality, and reduce vibration and noise in the intermittent working conditions of the system.

[0044] Preferably, the shock absorber unit comprises:

[0045] a shock absorber body for supporting the vehicle; and

[0046] A damping adjuster is disposed outside the shock absorber body and is used to adjust the damping force of the shock absorber body.

[0047] In the prior art, the damping of the shock absorber body is adjusted by a valve system arranged in the body, while in the present technical solution, the damping adjuster is arranged on the outside of the shock absorber body, which solves the problem that the traditional shock absorber needs to spend a long time to adjust the damping force of the valve system.

[0048] Preferably, the sensor unit is further used to detect the unsprung acceleration and the sprung acceleration, and output a second control signal based on the driving posture, the ground clearance, the unsprung acceleration and the sprung acceleration;

[0049] The second control signal includes:

[0050] A fourth signal output based on the driving attitude, the ground clearance, the unsprung acceleration, and the sprung acceleration; and

[0051] a fifth signal output based on the driving attitude, the ground clearance, the unsprung acceleration, and the sprung acceleration;

[0052] The damping regulator comprises:

[0053] At least two two-position two-way valves connected in parallel through pipelines, the two-position two-way valves connected in parallel are connected to the shock absorber body through pipelines;

[0054] The two-position two-way valve changes the switch state and the switching speed of the valve based on the second control signal.

[0055] The switch of the two-position two-way valve is controlled based on the second control signal. At this time, the second control signal selectively controls the two-position two-way valve to realize the switch, so that the damping regulator has different flow control gears, so as to better meet the needs of different actual working conditions; of course, the two-position two-way valve can also be opened or closed at the same time based on the second control signal.

[0056] Preferably, the damping regulator further comprises:

[0057] a charging check valve for replenishing inert gas into the damping regulator to provide air pressure; and

[0058] A damping piston, which is movably disposed inside the damping regulator and is used to balance the pressure between the inert gas and the hydraulic oil in the damping regulator;

[0059] The hydraulic oil entering the damping regulator is located on one side of the damping piston, and the inert gas is located on the other side of the damping piston.

[0060] Taking into account the large fluctuation of hydraulic oil pressure of high-speed switching valves, a high-pressure inert gas is filled into one end of the damping regulator through an air charging check valve to balance the internal pressure difference of the damping regulator. At the same time, the vibration absorption ability of the inert gas is better than that of the hydraulic oil, so the vibration and noise of the damping regulator can be reduced.

[0061] Preferably, the shock absorber body comprises:

[0062] Piston body;

[0063] A damping cylinder body, used for supporting the vehicle, wherein the damping cylinder body is divided into a first oil chamber and a second oil chamber by a piston body; and

[0064] A piston rod, one end of which extends into the damping cylinder and is fixedly connected to the piston body;

[0065] The piston body is slidably connected to the damping cylinder; the piston rod is a hollow structure, one end of which is close to the piston body and connected to the second oil chamber, and one end of which is far from the piston body and connected to the damping adjuster, and the end is connected to the oil tank;

[0066] The damping adjuster is communicated with the oil tank through an oil filling one-way valve.

[0067] The hydraulic oil in the oil tank is output to the shock absorber body through the driving unit. During this process, the hydraulic oil enters the second oil chamber, and in the process of continuously increasing the pressure, the hydraulic oil enters the first oil chamber through the piston body to meet the lifting and lowering requirements. During this process, the damping adjuster is used to replenish oil for the shock absorber body to achieve a change in the hydraulic oil flow rate, thereby changing the damping force of the shock absorber, so that the vehicle carried by the shock absorber unit can adapt to different working conditions.

[0068] Compared with the prior art, the present invention utilizes full hydraulic active control to realize vehicle posture adjustment and shock absorber damping force adjustment by identifying different signals, thereby making the vehicle suitable for different road conditions; the present invention can solve the problem that traditional active shock absorbers need to spend a long time to adjust the damping force; the present invention can also solve problems such as vibration and noise while the control system is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 is a system principle diagram of an embodiment of the present invention;

[0070] Figure 2 is a schematic diagram of a central control cylinder in an embodiment of the present invention;

[0071] Figure 3 for Figure 2 AA section view;

[0072] Figure 4 This is a schematic diagram of a control cylinder in an embodiment of the utility model;

[0073] Figure 5 A schematic diagram of a shock absorber body in an embodiment of the utility model;

[0074] Figure 6 for Figure 5 BB cross-section diagram;

[0075] Figure 7 is a schematic diagram of a damping regulator in an embodiment of the present invention;

[0076] Figure 8 for Figure 7 A top view of

[0077] Fig. 9 for Figure 8 CC profile of ;

[0078] Fig.10 for Figure 7 A front view of

[0079] Fig.11 for Fig.10 DD cross-section diagram.

[0080] In the figure: 1- oil tank; 2- first unit; 3- second unit; 4- third unit; 5- fourth unit; 6- pump assembly; 7- central control cylinder; 701- floating valve; 702- first cavity; 703- second cavity; 704- third cavity; 705- fourth cavity; 706- control cylinder; 707- left cavity; 708- middle cavity; 709- right cavity; 710- spring; 711- sleeve; 712- screw; 8- first gate valve; 9- second gate valve; 10- first valve; 11- second valve; 12- third valve; 13- fourth valve; 14- accumulator; 15- safety Valve; 16- shock absorber body; 1601- piston body; 1602- shock absorber cylinder; 1603- piston rod; 1604- first oil chamber; 1605- second oil chamber; 1606- upper support; 1607- lower support; 1608- first hole; 1609- second hole; 1610- first valve plate; 1611- second valve plate; 1612- pipe joint; 17- damping adjuster; 1701- two-position two-way valve; 1702- housing; 1703- liquid outlet pipe; 1704- charging check valve; 1705- damping piston; 1706- overflow valve seat; 1707- oil charging check valve. DETAILED DESCRIPTION

[0081] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0082] like Figure 1 As shown, an active hydraulic lifting control system includes a fuel tank 1, a shock absorber unit, a central control unit, a sensor unit and a drive unit; the fuel tank 1 is used to store hydraulic oil; the shock absorber units are four, which are respectively supported at the four wheels of the vehicle; the central control unit is used to issue a start-stop signal of the control system; the sensor unit is used to detect the ground clearance at the four wheels and / or the driving posture of the vehicle, and output a first control signal based on the ground clearance and / or the driving posture; the drive unit outputs the hydraulic oil in the fuel tank 1 based on the start-stop signal, and controls the hydraulic oil flow according to the first control signal to drive the shock absorber unit to achieve lifting movement or position maintenance; the sensor unit is used to detect the driving posture of the vehicle, including at least the steering wheel angle, brake status, throttle status, and vehicle speed.

[0083] In this embodiment, there are four shock absorber units, namely a first unit 2 , a second unit 3 , a third unit 4 and a fourth unit 5 .

[0084] It is understandable that in this embodiment, the control system has an MCU to realize sensor data calculation. In this embodiment, the sensor unit sends the acquired sensor data to the MCU, and after the MCU performs the calculation, the hydraulic oil output is controlled by the signal, so as to realize the height adjustment of the vehicle by the shock absorber unit, and thereby ensure that the shock absorber unit obtains different damping forces under different road conditions, so that the user can obtain better comfort. It is also understandable that the ground clearance, steering wheel angle, brake status, throttle status, and vehicle speed are all provided with detection data by corresponding sensors, and these sensors can be directly installed and used, and will not be described here.

[0085] Specifically, after the central control unit sends a start-stop signal, it can actively adjust the height of the vehicle supported by the shock absorber unit. During the driving of the vehicle, the sensor unit detects the steering wheel angle, brake status, throttle status, and vehicle speed in real time, and adjusts the hydraulic oil output in accordance with the ground clearance, thereby ensuring that the vehicle always remains horizontal or tends to be horizontal during driving, thereby providing driving comfort.

[0086] In order to better use this embodiment, the four wheels are respectively two wheels at the front end of the vehicle and two wheels at the rear end of the vehicle; one of the wheels at the front end of the vehicle and one of the wheels at the rear end of the vehicle are located on one side of the vehicle, and the other wheel at the front end of the vehicle and the other wheel at the rear end of the vehicle are located on the other side of the vehicle; the first control signal includes a first signal output based on detecting the ground clearance at the four wheels and / or the driving posture of the vehicle; the drive unit includes a pump assembly 6, a central control cylinder 7 and a gate valve; the pump assembly 6 enables the hydraulic oil in the oil tank 1 to obtain flow power based on the start-stop signal, and enables the hydraulic oil to flow toward the shock absorber unit; the gate valve realizes its switching based on the first signal; the shock absorber units connected to the two wheels at either end of the vehicle are connected through the gate valve; the central control cylinder 7 is used to balance the hydraulic oil pressure between the shock absorber units connected at the four wheels.

[0087] In this embodiment, four wheels are located at the four corners of the vehicle, namely the first wheel, the second wheel, the third wheel and the fourth wheel. It can be seen that the first wheel corresponds to the first unit 2, the second wheel corresponds to the second unit 3, the third wheel corresponds to the third unit 4, and the fourth wheel corresponds to the fourth unit 5.

[0088] It can be seen that the gate valve has two, namely the first gate valve 8 and the second gate valve 9. The first gate valve 8 acts on the first unit 2 and the second unit 3, and the second gate valve 9 acts on the third unit 4 and the fourth unit 5. The central control cylinder 7 can realize the hydraulic oil pressure regulation between the first unit 2, the second unit 3, the third unit 4 and the fourth unit 5.

[0089] In order to better use this embodiment, the first control signal also includes a second signal output based on detecting the ground clearance at the four wheels and / or the driving posture of the vehicle; the drive unit also includes a leveling valve; the leveling valve realizes its switching based on the second signal; the shock absorber unit and the pump assembly 6 connected to any wheel are connected through the leveling valve.

[0090] In this embodiment, there are four leveling valves, namely the first valve 10, the second valve 11, the third valve 12 and the fourth valve 13, which correspond to the first unit 2, the second unit 3, the third unit 4 and the fourth unit 5; it can be seen that the switch of the first valve 10 can limit the hydraulic oil from entering the first unit 2, the switch of the second valve 11 can limit the hydraulic oil from entering the second unit 3, the switch of the third valve 12 can limit the hydraulic oil from entering the third unit 4, and the switch of the fourth valve 13 can limit the hydraulic oil from entering the fourth unit 5.

[0091] It can be known that the ground clearance mentioned above is the ground clearance for the four wheels respectively. Therefore, based on the detection of the driving posture of the vehicle and the ground clearance for each wheel, the second signal is actually calculated by the MCU into four parts, namely the first part, the second part, the third part and the fourth part; the first part is used to control the first valve 10, the second part is used to control the second valve 11, the third part is used to control the third valve 12, and the fourth part is used to control the fourth valve 13.

[0092] When the pump assembly 6 is started based on the start-stop signal, the pump assembly 6 generates output power to the hydraulic oil in the oil tank 1, so that the hydraulic oil is output along the preset pipeline toward the shock absorber unit; at this time, the first valve 10, the second valve 11, the third valve 12 and the fourth valve 13 are all opened, thereby achieving the height lifting of the vehicle; at this time, the first gate valve 8 and the second gate valve 9 are also opened to achieve the hydraulic oil pressure balance between the corresponding wheels.

[0093] During vehicle driving, based on the ground clearance and driving posture of the four wheels, the first valve 10, the second valve 11, the third valve 12 and the fourth valve 13, as well as the first gate valve 8 and the second gate valve 9 are automatically switched on and off to adjust the hydraulic oil flow, thereby changing the damping force of the shock absorber unit.

[0094] In the above process, the central control cylinder 7 realizes pressure difference adjustment between the four shock absorber units due to the pressure difference, thereby better ensuring the driving stability of the vehicle.

[0095] In this embodiment, the pump assembly 6 mainly includes a gear pump, which has few components, good durability, and can be used externally. It can reduce internal leakage by loading the pressure relief pressure into the gear gap, thereby ensuring a higher hydraulic oil outflow pressure.

[0096] In order to better use this embodiment, the sensor unit is also used to detect the flow pressure of the hydraulic oil and output a pressure signal based on the flow pressure; the pump assembly 6 also adjusts the flow power of the hydraulic oil based on the pressure signal.

[0097] After the pump assembly 6 is started, a flow pressure sensor is provided in the pipeline, which feeds back the detected flow pressure of the hydraulic oil to the MCU to realize the functional adjustment of the pump assembly 6, thereby better meeting the demand for hydraulic oil flow adjustment.

[0098] like Figure 2 to Figure 4 As shown, in order to better use this embodiment, the central control cylinder 7 has four independent fluid chambers and a floating valve 701 arranged in the middle of the central control cylinder 7; each fluid chamber is connected to a corresponding shock absorber unit; the shock absorber units connected to the two wheels on the same side of the vehicle adjust the hydraulic oil pressure between their corresponding fluid chambers through the floating valve 701.

[0099] In this embodiment, corresponding to the four shock absorber units, the central control cylinder 7 has a first cavity 702 , a second cavity 703 , a third cavity 704 and a fourth cavity 705 which are independent of each other.

[0100] Specifically, the central control cylinder 7 includes a control cylinder body 706, which has a main cavity, and the main cavity is divided into a left cavity 707, a middle cavity 708 and a right cavity 709; the floating valve 701 is located in the main cavity, one end of the floating valve 701 is slidably connected to the left cavity 707, and the other end is slidably connected to the right cavity 709, and the middle part of the floating valve 701 has a protrusion, and the protrusion is slidably connected to the middle cavity 708; in addition, the two ends of the floating valve 701 are respectively connected to the ends of the left cavity 707 and the right cavity 709 through an elastic component, and one end of any elastic component close to another elastic component extends into the end of the floating valve 701, thereby realizing elastic guide limiting.

[0101] The elastic component includes a spring 710, a sleeve 711 and a screw 712. One end of the screw 712 is connected to the floating valve 701, and the other end is connected to the sleeve 711, and the end is clamped; one end of the sleeve 711 away from the screw 712 is fixedly connected to the end of the fluid chamber where it is located; the spring 710 is sleeved on the outside of the sleeve 711 and the screw 712.

[0102] At the same time, it can be known that the main cavity is divided into a first cavity 702, a second cavity 703, a third cavity 704 and a fourth cavity 705 by a floating valve 701. In this embodiment, the two ends of the main cavity are connected to the four shock absorber units in an X shape, that is, the first unit 2 and the fourth unit 5 are connected to the first cavity 702 and the fourth cavity 705 respectively, and the second unit 3 and the third unit 4 are connected to the second cavity 703 and the third cavity 704 respectively, thereby achieving the body balance of the vehicle by dynamically adjusting the hydraulic oil pressure.

[0103] It can be seen that after the hydraulic oil enters the central control cylinder 7 after being divided, the divided hydraulic oil enters the first cavity 702, the second cavity 703, the third cavity 704 and the fourth cavity 705 respectively; therefore, when there is a pressure difference between the first cavity 702, the second cavity 703, the third cavity 704 and the fourth cavity 705, the capacity of different cavities is dynamically adjusted through the floating valve 701, so as to adjust the damping force of the shock absorber unit. On this basis, the first gate valve 8 and the second gate valve 9 are adjusted in conjunction with the switch to achieve the balance of the hydraulic oil pressure between the shock absorber units.

[0104] In order to better use this embodiment, the first control signal also includes a third signal output based on detecting the ground clearance at the four wheels and / or the driving posture of the vehicle; the drive unit also includes an accumulator 14 and an oil return pipeline; the accumulator 14 is used to store excess pressurized oil provided by the pump assembly 6; the oil return pipeline is arranged between the oil tank 1 and the accumulator 14, and is connected to the oil tank 1; the oil return pipeline is provided with a safety valve 15, and the safety valve 15 realizes pressure relief of the control system based on the third signal.

[0105] After the pump assembly 6 is started, the sensor unit outputs a third signal based on the ground clearance of the four wheels and the driving posture of the vehicle. Of course, the third signal can also be output based on the ground clearance of the four wheels or the driving posture of the vehicle. At this time, the MCU can control the accumulator 14 or the safety valve 15 to open or close according to the data fed back by the sensor unit, so that the accumulator 14 provides pressure or the safety valve 15 completes pipeline pressure relief.

[0106] Therefore, when using this embodiment, high-pressure hydraulic oil is continuously pumped out from the oil tank 1 through the pump assembly 6. When the hydraulic oil in the pipeline is too high, the safety valve 15 opens to release the pressure. When the hydraulic oil in the control system needs to be replaced or the pressure is released, the hydraulic oil can return to the oil tank 1 through the return oil pipeline and will not flow to the accumulator 14.

[0107] In order to better use this embodiment, the shock absorber unit includes a shock absorber body 16 and a damping adjuster 17; the shock absorber body 16 is used to support the vehicle; the damping adjuster 17 is externally arranged on the shock absorber body 16 to achieve damping force adjustment of the shock absorber body 16.

[0108] In this embodiment, the damping regulator 17 is connected to the shock absorber body 16 at its outer side, and the damping regulator 17 is controlled by the MCU to adjust the flow of hydraulic oil, thereby quickly changing the damping force of the shock absorber unit.

[0109] like Figure 7 to Figure 11 As shown, in this embodiment, the damping regulator 17 has a two-position two-way valve 1701. In order to simply and clearly explain the following embodiment, this embodiment has two two-position two-way valves 1701. It should be noted that this embodiment can be provided with not only two two-position two-way valves 1701, but also three, four, or more. Regardless of the number, the principle is the same as the following content.

[0110] Therefore, in order to better use this embodiment, the sensing unit is also used to detect the unsprung acceleration and the sprung acceleration, and output a second control signal based on the driving posture, ground clearance, unsprung acceleration and sprung acceleration; the second control signal includes a fourth signal output based on the driving posture, ground clearance, unsprung acceleration and sprung acceleration, and a fifth signal output based on the driving posture, ground clearance, unsprung acceleration and sprung acceleration; the damping regulator 17 includes two two-position two-way valves 1701 connected in parallel through pipelines, and the two parallel two-position two-way valves 1701 are connected to the shock absorber body 16 through pipelines; one of the two-position two-way valves 1701 changes the switching state and switching speed of the valve based on the fourth signal; the other two-position two-way valve 1701 changes the switching state and switching speed of the valve based on the fifth signal.

[0111] The damping regulator 17 directly acts on its corresponding sensor unit, and outputs a control signal based on the driving posture, the ground clearance, the unsprung acceleration and the sprung acceleration to realize the control of the two two-position two-way valves 1701.

[0112] It should be noted that the setting of the damping adjuster 17 can directly change the flow rate of the hydraulic oil entering the shock absorber body 16. By opening or changing the two-position two-way valve 1701, the flow rate of the hydraulic oil is changed, thereby adjusting the damping force of the shock absorber body 16.

[0113] In addition to the two two-position two-way valves 1701, the damping regulator 17 also includes a housing 1702; one end of the housing 1702 is provided with a two-position two-way valve 1701, and the end is provided with a liquid outlet pipe 1703, the liquid outlet pipe 1703 is connected to the shock absorber body 16, and a certain volume of hydraulic oil is pre-stored inside the housing 1702, so that when one or both of the two-position two-way valves 1701 are opened, the hydraulic oil can increase the flow rate entering the shock absorber body 16, thereby realizing the hydraulic oil flow regulation. Therefore, through the above-mentioned hydraulic oil flow regulation, the height change of the vehicle suspension can be well realized through the shock absorber. In the figure, the double-lined line is the flow path of the hydraulic oil. It can be understood that on this path, the hydraulic oil can realize bidirectional movement.

[0114] Therefore, the more hydraulic oil stored in the damping adjuster, the less hydraulic oil enters the shock absorber, and the lower the suspension height; the less hydraulic oil stored in the damping adjuster, the more hydraulic oil enters the shock absorber, and the higher the suspension height.

[0115] In order to better use this embodiment, the damping regulator 17 also includes an inflation check valve 1704 and a damping piston 1705; the inflation check valve 1704 is used to supplement inert gas into the damping regulator 17 to provide air pressure; the damping piston 1705 is movably arranged inside the damping regulator 17 to balance the pressure between the inert gas and the hydraulic oil in the damping regulator 17; the hydraulic oil entering the damping regulator 17 is located on one side of the damping piston 1705, and the inert gas is located on the other side of the damping piston 1705.

[0116] The two two-position two-way valves 1701 are both arranged at one end of the housing 1702 , and the end is provided with a pipe joint 1612 for connecting to the shock absorber body 16 ; the inflation check valve 1704 is arranged at one end of the housing 1702 away from the two-position two-way valve 1701 .

[0117] The damping piston 1705 is slidably connected to the housing in the housing, and in this embodiment, the outer side surface of the damping piston 1705 is in contact with the inner side surface of the housing to avoid gas-liquid mixing.

[0118] The hydraulic oil enters the damping regulator 17, and its flow pressure pushes the damping piston 1705 to move toward the inflation check valve 1704. At this time, inert gas is added through the inflation check valve 1704 to balance the position of the damping piston 1705. In this embodiment, after the two two-position two-way valves 1701 are connected in parallel, they are connected to the pipe joint 1612 through the liquid outlet pipe 1703. Therefore, the opening and closing of different numbers of two-position two-way valves 1701 can achieve the adjustment of different hydraulic oil flows.

[0119] That is to say, the damping regulator 17 realizes hydraulic oil flow regulation based on the fourth signal and / or the fifth signal, so that the hydraulic oil flow regulation has at least three adjustment gears, namely double open, double closed, and one open and one closed. In some other embodiments, the two-position two-way valve 1701 can also change its state switching speed through the instruction of the MCU, such as changing the current flowing into the coil in the two-position two-way valve 1701 within an appropriate current range.

[0120] In the above process, an external inert gas source fills inert gas into the damping regulator 17 through the charging check valve 1704 to avoid excessive oil fluctuations caused by the high-speed switching of the two-position two-way valve 1701. As a result, not only the inert gas is used to balance the pressure difference in the damping regulator 17, but also the vibration absorption ability of the inert gas is superior to that of hydraulic oil, thereby reducing the vibration and noise of the damping regulator 17.

[0121] In addition, in some embodiments, the damping regulator 17 is provided with an overflow valve seat 1706, which has an overflow valve to avoid the problem of excessive hydraulic oil pressure that cannot meet usage requirements.

[0122] In this embodiment, the accumulator 14 and the overflow valve seat 1706 of the overflow valve can both be switched based on the first control signal of the driving posture and the ground clearance.

[0123] It needs to be explained that in Figure 1 In, A represents the pressure signal, B represents the start-stop signal, C represents the signal for controlling the accumulator 14, F represents the first signal for controlling the first gate valve 8, I represents the first signal for controlling the second gate valve 9, D represents the second signal for controlling the first valve 10, E represents the second signal for controlling the second valve 11, F represents the second signal for controlling the third valve 12, and G represents the second signal for controlling the fourth valve 13. It should be emphasized here that the first signal and the second signal are signals for controlling the gate valve and the leveling valve respectively, that is, the first signal is the first gate valve 8 signal and the second gate valve 9 signal for different gate valves, and the second signal is the first valve 10 signal, the second valve 11 signal, the third valve 12 signal and the fourth valve 13 signal for different leveling valves, that is, the first part, the second part, the third part and the fourth part mentioned above.

[0124] like Figure 5 and Figure 6As shown, in order to better use this embodiment, the shock absorber body 16 includes a piston body 1601, a shock absorbing cylinder 1602 and a piston rod 1603; the shock absorbing cylinder 1602 is used to support the vehicle, and the shock absorbing cylinder 1602 is divided into a first oil chamber 1604 and a second oil chamber 1605 by the piston body 1601; one end of the piston rod 1603 extends into the shock absorbing cylinder 1602 and is fixedly connected to the piston body 1601; the piston body 1601 is slidably connected to the shock absorbing cylinder 1602; the piston rod 1603 is a hollow structure, and its end close to the piston body 1601 is connected to the second oil chamber 1605, and its end away from the piston body 1601 is connected to the damping adjuster 17, and this end is connected to the oil tank 1; the damping adjuster 17 is connected to the oil tank 1 through the oil filling one-way valve 1707.

[0125] In this embodiment, the shock absorber body 16 further includes an upper support 1606, and the shock absorber cylinder 1602 has a lower support 1607. The shock absorber body 16 is connected to the vehicle via the upper support 1606 and the lower support 1607, so that the shock absorber unit supports the vehicle.

[0126] One end of the piston rod 1603 is arranged on the upper support 1606, and the other end extends into the damping cylinder 1602, and is connected to the second oil chamber 1605 separated by the piston body 1601; the lower support 1607 is arranged at one end of the damping cylinder 1602 away from the upper support 1606.

[0127] The piston body 1601 is provided with a plurality of inclined first holes 1608 and second holes 1609; a first valve plate 1610 and a second valve plate 1611 are provided on the piston body 1601; the first valve plate 1610 is used to block one end of the first hole 1608 connected to the first oil chamber 1604, and the second valve plate 1611 is used to block one end of the second hole 1609 connected to the second oil chamber 1605.

[0128] Therefore, when the car needs to be raised, the MCU issues a corresponding command, the four leveling valves open, and the high-pressure hydraulic oil pumped out by the pump assembly 6 enters the damping cylinder 1602 through the central control cylinder 7, pushing out the piston rod 1603. At the same time, the MCU controls the gate valve to open, balance the oil pressure between the left and right wheels, and realize the overall suspension height increase.

[0129] During driving, due to road conditions, after the hydraulic oil enters the second chamber 703, the piston rod 1603 drives the piston body 1601 to move, causing the space of the second oil chamber 1605 to shrink. At this time, the hydraulic oil enters the first oil chamber 1604 through the first hole 1608 to open the first valve plate 1610, so as to achieve pressure balance between the first oil chamber 1604 and the second oil chamber 1605; similarly, when the piston rod 1603 drives the piston body 1601 to reset, the space of the first oil chamber 1604 shrinks. At this time, the hydraulic oil enters the second oil chamber 1605 through the second hole 1609 to open the second valve plate 1611, so as to achieve pressure balance between the first oil chamber 1604 and the second oil chamber 1605.

[0130] In the above process, the shock absorber units corresponding to the wheels at the same end achieve pressure balance through the central control cylinder 7.

[0131] Therefore, this embodiment changes the working state of each valve through the control signal, thereby realizing the damping force adjustment of the shock absorber unit, and the vehicle height adjustment can be realized through this embodiment, thereby satisfying the full hydraulic lifting control and active vibration reduction. Therefore, this embodiment avoids the problem that when the air spring 710 shock absorber is used in the prior art, its bladder is made of rubber material and is easy to age, and the volume changes frequently, resulting in the rounded corners being easy to crack and causing the shock absorber to fail; it also avoids the problem that the traditional hydraulic lifting shock absorber has multiple sets of valve systems in the cylinder, and it takes a long time to adjust the valve system damping force for different vehicles.

[0132] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An active hydraulic lifting control system, characterized in that: include: Oil tank, used to store hydraulic oil; A shock absorber unit, wherein the shock absorber units are provided in four numbers and are respectively supported at four wheels of the vehicle; The central control unit is used to send start and stop signals of the control system; A sensing unit, for detecting the ground clearance at four wheels and / or the driving posture of the vehicle, and outputting a first control signal based on the ground clearance and / or the driving posture; as well as A driving unit, wherein the driving unit outputs the hydraulic oil in the oil tank based on the start-stop signal and controls the flow rate of the hydraulic oil according to the first control signal to drive the shock absorber unit to achieve lifting movement or position maintenance; Wherein, the sensing unit is used to detect the driving posture of the vehicle including at least the steering wheel angle, brake status, throttle status, and vehicle speed; The four wheels are two wheels at the front end of the vehicle and two wheels at the rear end of the vehicle; One of the wheels at the front end of the vehicle and one of the wheels at the rear end of the vehicle are located on one side of the vehicle, and another wheel at the front end of the vehicle and another wheel at the rear end of the vehicle are located on the other side of the vehicle; The first control signal includes: A first signal output based on detecting the ground clearance at four wheels and / or the driving posture of the vehicle; The drive unit includes: a pump assembly, wherein the pump assembly enables the hydraulic oil in the oil tank to obtain flow power based on the start-stop signal and causes the hydraulic oil to flow toward the shock absorber unit; A central control cylinder that balances the hydraulic oil pressure between the shock absorber units connected at all four wheels; and A gate valve, wherein the gate valve is switched based on a first signal; Wherein, the shock absorber units connected to the two wheels at either end of the vehicle are connected via a gate valve; The first control signal also includes: A second signal output based on detecting the ground clearance at four wheels and / or the driving posture of the vehicle; The driving unit further comprises: A leveling valve, wherein the leveling valve is switched based on a second signal; Wherein, the shock absorber unit and the pump assembly connected to any one of the wheels are connected via a leveling valve; The sensing unit is also used to detect the flow pressure of the hydraulic oil and output a pressure signal based on the flow pressure; The pump assembly also adjusts the flow power of the hydraulic oil based on the pressure signal; The central control cylinder has four independent fluid chambers and a floating valve arranged in the middle of the central control cylinder; Each fluid chamber is connected to a corresponding damper unit; The shock absorber units connected to the two wheels on the same side of the vehicle adjust the hydraulic oil pressure between their corresponding fluid chambers through a floating valve; The first control signal also includes: A third signal output based on detecting the ground clearance at four wheels and / or the driving posture of the vehicle; The driving unit further comprises: an accumulator for storing excess pressurized fluid supplied by the pump assembly; and An oil return pipeline, the oil return pipeline is arranged between the oil tank and the accumulator and is connected to the oil tank; Wherein, the oil return pipeline is provided with a safety valve, and the safety valve realizes pressure relief of the control system based on the third signal.

2. An active hydraulic lifting control system as claimed in claim 1, characterized in that: The shock absorber unit consists of: a shock absorber body for supporting the vehicle; and A damping adjuster is disposed outside the shock absorber body and is used to adjust the damping force of the shock absorber body.

3. An active hydraulic lifting control system as claimed in claim 2, characterized in that: The sensor unit is also used to detect the unsprung acceleration and the sprung acceleration, and output a second control signal based on the driving attitude, the ground clearance, the unsprung acceleration and the sprung acceleration; The damping regulator comprises: At least two two-position two-way valves connected in parallel through pipelines, the two-position two-way valves connected in parallel are connected to the shock absorber body through pipelines; The two-position two-way valve changes the switch state and the switching speed of the valve based on the second control signal.

4. An active hydraulic lifting control system according to claim 2 or 3, characterized in that: The damping regulator also includes: a charging check valve for replenishing inert gas into the damping regulator to provide air pressure; and A damping piston, which is movably disposed inside the damping regulator and is used to balance the pressure between the inert gas and the hydraulic oil in the damping regulator; The hydraulic oil entering the damping regulator is located on one side of the damping piston, and the inert gas is located on the other side of the damping piston.

5. The active hydraulic lifting control system according to claim 2, characterized in that: The shock absorber body comprises: Piston body; A damping cylinder body, used for supporting the vehicle, wherein the damping cylinder body is divided into a first oil chamber and a second oil chamber by a piston body; and A piston rod, one end of which extends into the damping cylinder and is fixedly connected to the piston body; The piston body is slidably connected to the damping cylinder; the piston rod is a hollow structure, one end of which is close to the piston body and connected to the second oil chamber, one end of which is far from the piston body and connected to the damping adjuster, and one end of which is far from the piston body and connected to the oil tank; The damping adjuster is communicated with the oil tank through an oil filling one-way valve.

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