Vehicle suspension damping system and vehicle

Abstract

A vehicle suspension damping system is characterized in that a first piston body (114) is arranged in a front suspension hydraulic cylinder (110), the first piston body comprises a first piston rod and a first top cover, and the first top cover abuts against the inner wall of the front suspension hydraulic cylinder and divides the interior of the front suspension hydraulic cylinder into a first air cavity (115) and a first oil cavity (116); a second piston body (124) is arranged in the rear suspension hydraulic cylinder (120) and comprises a second piston rod and a second top cover, and the second top cover abuts against the inner wall of the rear suspension hydraulic cylinder and divides the interior of the rear suspension hydraulic cylinder into a second air cavity (125) and a second oil cavity (126); the two ends of the first conveying pipeline (140) are communicated with the first air cavity and the second air cavity respectively. The system can effectively improve the road feeling of a driver, the vehicle operation stability and the riding comfort of passengers. In addition, the invention also relates to a vehicle.

Description

Vehicle suspension damping system and vehicle TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle damping, in particular to a vehicle suspension damping system and vehicle. BACKGROUND

[0002] Suspension is the general term for all force transmission connecting devices between the frame (or body) of the vehicle and the axle (or wheel), its function is to transmit the force and torque between the wheel and the frame, and to buffer the impact force transmitted to the frame or body by the uneven road, and to reduce the vibration caused thereby. Only a well-performing suspension system can ensure that the vehicle has good ride comfort, handling stability and safety and reliability.

[0003] At present, the suspension system of the automobile usually uses springs or hydraulic components to provide damping and buffering functions, however, this damping method is relatively single, and the damping adjustment method is also quite fixed, lacking sufficient flexibility, so that the comfort of passengers is low when the vehicle is driving, especially when the vehicle suspension damping effect is not ideal on the bumpy road, the passengers will feel more uncomfortable, affecting the user's driving experience.

[0004] SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a vehicle suspension damping system and vehicle, which can effectively improve the driver's road feeling, the stability of vehicle operation and the comfort of passenger riding.

[0006] Embodiments of the first aspect of the present application provide a vehicle suspension damping system, comprising: a front suspension hydraulic cylinder, a rear suspension hydraulic cylinder, a front wheel, a rear wheel, a first delivery pipeline, a second delivery pipeline, a third delivery pipeline, a fourth delivery pipeline, a fifth delivery pipeline, a sixth delivery pipeline, a seventh delivery pipeline, an eighth delivery pipeline, a high-pressure gas pump, a high-pressure oil pump, a hydraulic oil storage tank, a first oil return pressure tank, a second oil return pressure tank, a first adjustable damping valve and a second adjustable damping valve.

[0007] The inside of the front suspension hydraulic cylinder is provided with a first piston body, the first piston body comprises a first piston rod and a first top cover, the first top cover abuts against the inner wall of the front suspension hydraulic cylinder and divides the inside of the front suspension hydraulic cylinder into a first gas cavity and a first oil cavity, the first gas cavity is arranged above the first top cover, the first oil cavity is arranged below the first top cover, one end of the first piston rod is connected to the bottom of the first top cover, the other end of the first piston rod extends out of the top of the front suspension hydraulic cylinder and is connected to the front wheel.

[0008] The interior of the rear suspension hydraulic cylinder is provided with a second piston body, the second piston body includes a second piston rod and a second top cover, the second top cover abuts with the inner wall of the rear suspension hydraulic cylinder and divides the interior of the rear suspension hydraulic cylinder into a second gas cavity and a second oil cavity, the second gas cavity is arranged above the second top cover, the second oil cavity is arranged below the second top cover, one end of the second piston rod is connected with the bottom of the second top cover, and the other end of the second piston rod extends out of the top of the rear suspension hydraulic cylinder and is connected to the rear wheel.

[0009] The two ends of the first conveying pipeline are in communication with the first gas cavity and the second gas cavity respectively, and a first electromagnetic control valve is arranged on the first conveying pipeline; one end of the second conveying pipeline is in communication with the high-pressure gas pump, and the other end of the second conveying pipeline is in communication with the first oil return pressure tank through the top of the first oil return pressure tank; a second electromagnetic control valve is arranged on the second conveying pipeline; one end of the third conveying pipeline is in communication with the high-pressure gas pump, and the other end of the third conveying pipeline is in communication with the second oil return pressure tank through the top of the second oil return pressure tank; a third electromagnetic control valve is arranged on the third conveying pipeline; the two ends of the fourth conveying pipeline are in communication with the high-pressure gas pump and the high-pressure oil pump respectively; a fourth electromagnetic control valve and a fifth electromagnetic control valve are arranged on the fourth conveying pipeline; the first electromagnetic control valve is arranged close to the first gas cavity; the second electromagnetic control valve and the third electromagnetic control valve are arranged close to the high-pressure gas pump; the fourth electromagnetic control valve is arranged between the high-pressure gas pump and the first conveying pipeline; and the fifth electromagnetic control valve is arranged close to the high-pressure oil pump.

[0010] One end of the fifth conveying pipeline is in communication with the first oil cavity, and the other end of the fifth conveying pipeline is in communication with the first oil return pressure tank through the bottom of the first oil return pressure tank; one end of the sixth conveying pipeline is in communication with the second oil cavity, and the other end of the sixth conveying pipeline is in communication with the second oil return pressure tank through the bottom of the second oil return pressure tank; the two ends of the seventh conveying pipeline are in communication with the first oil return pressure tank and the high-pressure oil pump respectively; a sixth electromagnetic control valve is arranged on the seventh conveying pipeline; the two ends of the eighth conveying pipeline are in communication with the second oil return pressure tank and the high-pressure oil pump respectively; a seventh electromagnetic control valve is arranged on the eighth conveying pipeline; and the hydraulic oil storage tank is in communication with the high-pressure oil pump.

[0011] According to some embodiments of the first aspect of the application, the vehicle suspension damping system further comprises a first adjustable damping valve arranged on the fifth conveying pipeline.

[0012] According to some embodiments of the first aspect of the present application, the vehicle suspension damping system further comprises a second adjustable damping valve, which is arranged on the sixth delivery pipeline.

[0013] According to some embodiments of the first aspect of the present application, the vehicle suspension damping system further comprises a suspension, a first suspension height sensor, a second suspension height sensor and a control device, the front suspension hydraulic cylinder is arranged at the bottom of the front end of the suspension, the rear suspension hydraulic cylinder is arranged at the bottom of the rear end of the suspension, the first suspension height sensor and the second suspension height sensor are both arranged on the suspension, the first suspension height sensor is arranged close to the front end of the suspension, the second suspension height sensor is arranged close to the rear end of the suspension, the first suspension height sensor and the second suspension height sensor are both connected with the control device, and the control device is further connected with the first electromagnetic control valve, the second electromagnetic control valve, the third electromagnetic control valve, the fourth electromagnetic control valve, the fifth electromagnetic control valve, the sixth electromagnetic control valve and the seventh electromagnetic control valve respectively.

[0014] According to some embodiments of the first aspect of the present application, the vehicle suspension damping system further comprises an electromagnetic relief valve, which is in communication with the first gas cavity and the second gas cavity respectively.

[0015] According to some embodiments of the first aspect of the present application, the vehicle suspension damping system further comprises a first high-pressure gas tank and a second high-pressure gas tank, the first high-pressure gas tank is in communication with the first gas cavity and one end of the first delivery pipeline close to the first gas cavity respectively, and the second high-pressure gas tank is in communication with the second gas cavity and one end of the second delivery pipeline close to the second gas cavity respectively.

[0016] According to some embodiments of the first aspect of the present application, the vehicle suspension damping system further comprises an eighth electromagnetic control valve, which is arranged on the first delivery pipeline, and the eighth electromagnetic control valve is arranged close to the second high-pressure gas tank.

[0017] According to some embodiments of the first aspect of the present application, the vehicle suspension damping system further comprises a third high-pressure gas tank and a ninth delivery pipeline, the third high-pressure gas tank is in communication with the high-pressure gas pump through the ninth delivery pipeline, and the third high-pressure gas tank is further in communication with one end of the second delivery pipeline, the third delivery pipeline and the fourth delivery pipeline close to the high-pressure gas pump respectively.

[0018] According to some embodiments of the first aspect of the present application, the vehicle suspension damping system further comprises a check valve, which is arranged between the third high-pressure gas tank and the high-pressure gas pump, and the check valve is arranged on the ninth delivery pipeline.

[0019] According to the vehicle of the second aspect of the present application, at least the following beneficial effects are achieved: the vehicle suspension damping system according to the first aspect of the present application is included, and a brake pedal is further electrically connected to the first electromagnetic control valve in the vehicle suspension damping system.

[0020] In the present application, before the vehicle runs, the first delivery pipeline connects the first air chamber and the second air chamber. When the weight of one end of the vehicle body is higher than the weight of the other end of the vehicle body, the high-pressure gas in the air chamber of the heavy end of the vehicle body is delivered to the air chamber of the other end through the first delivery pipeline, that is, the heavy end of the vehicle body sinks, and the light end of the vehicle body rises. For example, when the weight above the front suspension hydraulic cylinder is greater than the weight above the rear suspension hydraulic cylinder, the height of the front suspension hydraulic cylinder will decrease and the height of the rear suspension hydraulic cylinder will increase. At this time, the third electromagnetic control valve is opened and the high-pressure gas pump is started to introduce pressurized gas into the second oil return pressure tank, so that the pressurized gas provides pressure to the second oil return pressure tank, and the pressure is delivered from the second oil chamber to the second top cover through the sixth delivery pipeline, so that the second piston body slides with the cylinder wall of the rear suspension hydraulic cylinder, thereby causing the rear suspension hydraulic cylinder to descend until the corresponding vehicle body of the rear suspension hydraulic cylinder and the front suspension hydraulic cylinder is balanced, and the remaining electromagnetic control valves except the first electromagnetic control valve are closed after the vehicle body posture adjustment is completed. After the vehicle body is adjusted and balanced, the pressure in the first oil chamber and the second oil chamber is constant, that is, the pressure in the first oil return pressure tank and the second oil return pressure tank is constant. During vehicle driving, the high-pressure gas pump and the high-pressure oil pump are in the closed state. When the vehicle runs on uneven road, the suspension of the front suspension hydraulic cylinder and the rear suspension hydraulic cylinder will change due to the sliding between the front suspension hydraulic cylinder and the corresponding piston body and the sliding between the rear suspension hydraulic cylinder and the corresponding piston body. At this time, the front suspension hydraulic cylinder and the rear suspension hydraulic cylinder return to the original position by the elastic potential energy of the pressurized gas in the first oil chamber and the first oil return pressure tank and the pressurized gas in the second oil chamber and the second oil return pressure tank. Therefore, the vehicle can run stably on uneven road, and the stability of the vehicle operation and the comfort of the passengers can be improved. Through the above arrangement, the driver's road feeling, the stability of the vehicle operation and the comfort of the passengers can be effectively improved.

[0021] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the related art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0023] Fig. 1 is a structural schematic diagram of a vehicle suspension damping system corresponding to a single-axle vehicle according to an embodiment of the present application;

[0024] Fig. 2 is a partial structural schematic diagram of a vehicle suspension damping system corresponding to a single-axle vehicle according to an embodiment of the present application;

[0025] Fig. 3 is a structural schematic diagram of a vehicle suspension damping system corresponding to a double-axle vehicle according to an embodiment of the present application;

[0026] Fig. 4 is a structural schematic diagram of a vehicle suspension damping system corresponding to a three-axle vehicle according to an embodiment of the present application;

[0027] Fig. 5 is a structural schematic diagram of a vehicle suspension damping system corresponding to a four-axle vehicle according to an embodiment of the present application.

[0028] Fig. 1 is a structural schematic diagram of a vehicle suspension damping system corresponding to a single-axle vehicle according to an embodiment of the present application; DETAILED DESCRIPTION

[0029] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of the present application.

[0030] In the description of the present application, it should be understood that the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In the description of the present application, if the first, second, etc. are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0032] In the description of the present application, unless otherwise explicitly limited, the words such as arrangement, installation, connection and the like should be broadly understood, and a person of ordinary skill in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0033] Suspension is the general term for all force transmission connecting devices between the frame (or body-on-frame) and the axle (or wheel) of the automobile, which functions to transmit the force and torque between the wheel and the frame, and to buffer the impact force transmitted to the frame or body by the uneven road and to reduce the vibration caused thereby. Only a good suspension system can ensure that the automobile has good ride comfort, handling stability and safety and reliability.

[0034] At present, the suspension system of the automobile usually uses springs or hydraulic components to provide damping and buffering functions. However, this damping method is relatively single, and the damping adjustment method is also quite fixed, lacking sufficient flexibility, so that the comfort of passengers is low when the vehicle is running, especially when the damping effect of the vehicle suspension is not ideal on the bumpy road, the passengers will feel more uncomfortable, affecting the user's driving experience.

[0035] In order to solve the above problems, the present application provides a vehicle suspension damping system and a vehicle. The embodiments of the present application will be further described below with reference to the drawings.

[0036] With reference to FIG. 1, the first aspect embodiment of the present application provides a vehicle suspension damping system, comprising a front suspension hydraulic cylinder 110, a rear suspension hydraulic cylinder 120, a front wheel 111, a rear wheel 121, a first conveying pipeline 140, a second conveying pipeline, a third conveying pipeline, a fourth conveying pipeline, a fifth conveying pipeline, a sixth conveying pipeline, a seventh conveying pipeline, an eighth conveying pipeline, a high-pressure gas pump 133, a high-pressure oil pump 131, a hydraulic oil storage tank 130, a first oil return pressure tank 112 and a second oil return pressure tank 122; the inside of the front suspension hydraulic cylinder 110 is provided with a first piston body 114, the first piston body 114 comprises a first piston rod and a first top cover, the first top cover abuts against the inner wall of the front suspension hydraulic cylinder 110 and divides the inside of the front suspension hydraulic cylinder 110 into a first gas cavity 115 and a first oil cavity 116, the first gas cavity 115 is arranged above the first top cover, the first oil cavity 116 is arranged below the first top cover, one end of the first piston rod is connected to the bottom of the first top cover, and the other end of the first piston rod extends out of the top of the front suspension hydraulic cylinder 110 and is connected to the front wheel 111; the inside of the rear suspension hydraulic cylinder 120 is provided with a second piston body 124, the second piston body 124 comprises a second piston rod and a second top cover, the second top cover abuts against the inner wall of the rear suspension hydraulic cylinder 120 and divides the inside of the rear suspension hydraulic cylinder 120 into a second gas cavity 125 and a second oil cavity 126, the second gas cavity 125 is arranged above the second top cover, the second oil cavity 126 is arranged below the second top cover, one end of the second piston rod is connected to the bottom of the second top cover, and the other end of the second piston rod extends out of the top of the rear suspension hydraulic cylinder 120 and is connected to the rear wheel 121; the two ends of the first conveying pipeline 140 are in communication with the first gas cavity 115 and the second gas cavity 125 respectively, and the first conveying pipeline 140 is provided with a first electromagnetic control valve 150, one end of the second conveying pipeline is in communication with the high-pressure gas pump 133, the other end of the second conveying pipeline is in communication with the first oil return pressure tank 112 through the top of the first oil return pressure tank 112, the second conveying pipeline is provided with a second electromagnetic control valve 151, one end of the third conveying pipeline is in communication with the high-pressure gas pump 133, the other end of the third conveying pipeline is in communication with the second oil return pressure tank 122 through the top of the second oil return pressure tank 122, the third conveying pipeline is provided with a third electromagnetic control valve 152, the two ends of the fourth conveying pipeline are in communication with the high-pressure gas pump 133 and the high-pressure oil pump 131 respectively, the fourth conveying pipeline is provided with a fourth electromagnetic control valve 153 and a fifth electromagnetic control valve 154, the first electromagnetic control valve 150 is arranged close to the first gas cavity 115, the second electromagnetic control valve 151 and the third electromagnetic control valve 152 are both arranged close to the high-pressure gas pump 133, the fourth electromagnetic control valve 153 is arranged between the high-pressure gas pump 133 and the first conveying pipeline 140, and the fifth electromagnetic control valve 154 is arranged close to the high-pressure oil pump 131.One end of the fifth delivery pipeline is communicated with the first oil cavity 116, the other end of the fifth delivery pipeline is communicated with the first oil return pressure tank 112 through the bottom of the first oil return pressure tank 112, one end of the sixth delivery pipeline is communicated with the second oil cavity 126, the other end of the sixth delivery pipeline is communicated with the second oil return pressure tank 122 through the bottom of the second oil return pressure tank 122, two ends of the seventh delivery pipeline are communicated with the first oil return pressure tank 112 and the high-pressure oil pump 131 respectively, the sixth electromagnetic control valve 155 is arranged on the seventh delivery pipeline, two ends of the eighth delivery pipeline are communicated with the second oil return pressure tank 122 and the high-pressure oil pump 131 respectively, the seventh electromagnetic control valve 156 is arranged on the eighth delivery pipeline, and the hydraulic oil storage tank 130 is communicated with the high-pressure oil pump 131.

[0037] It should be noted that for the single-axle vehicle as shown in FIG. 1, the lower chamber in the front suspension hydraulic cylinder 110, i.e., the first oil cavity 116, the fifth delivery pipeline and the first oil return pressure tank 112, combine to form an oil gas spring, and the lower chamber in the rear suspension hydraulic cylinder 120, i.e., the second oil cavity 126, the sixth delivery pipeline and the second oil return pressure tank 122, combine to form an oil gas spring.

[0038] It should be noted that the first electromagnetic control valve 150 is electrically connected with the brake pedal of the vehicle, when the vehicle needs to be braked urgently, a control signal is sent to the first electromagnetic control valve 150 through the brake pedal to close the first electromagnetic control valve 150, so as to prevent the pressure in the first gas cavity 115 and the second gas cavity 125 from being released through the first delivery pipeline 140, thereby preventing the phenomenon of vehicle nodding during braking.

[0039] In the present application, before the vehicle runs, when the weight of one end of the vehicle body is higher than that of the other end of the vehicle body, the high-pressure gas in the air chamber of the heavy end of the vehicle body will be transported to the air chamber of the other end through the first conveying pipeline 140, that is, the heavy end of the vehicle body will sink, and the light end of the vehicle body will rise. For example, when the load above the front suspension hydraulic cylinder 110 is greater than the load above the rear suspension hydraulic cylinder 120, the height of the front suspension hydraulic cylinder 110 will decrease and the rear suspension hydraulic cylinder 120 will rise. At this time, the third electromagnetic control valve 152 is opened and the high-pressure gas pump 133 is started to introduce pressurized gas into the second oil return pressure tank 122, so that the pressurized gas provides pressure to the second oil return pressure tank 122, and the pressure is transported from the second oil chamber 126 to the second piston body 124 through the sixth conveying pipeline, so that the second piston body 124 and the rear suspension hydraulic cylinder 120 cylinder wall produce sliding, so that the rear suspension hydraulic cylinder 120 is lowered, until the rear suspension hydraulic cylinder 120 and the front suspension hydraulic cylinder 110 corresponding to the vehicle body balance, and after the vehicle body posture adjustment is completed, the remaining electromagnetic control valves except the first electromagnetic control valve 150 are closed. During vehicle driving, the high-pressure gas pump 133 and the high-pressure oil pump 131 are in closed state, when the vehicle runs on uneven road, when the vehicle body bounces, the extension and contraction of the suspension on the front suspension hydraulic cylinder 110 and the rear suspension hydraulic cylinder 120 changes due to the sliding between the front suspension hydraulic cylinder 110 and the rear suspension hydraulic cylinder 120 and the corresponding piston body, at this time, the return of the front suspension hydraulic cylinder 110 and the rear suspension hydraulic cylinder 120 relies on the elastic potential energy of the pressurized gas in the first oil chamber 116 and the first oil return pressure tank 112, and the pressurized gas in the second oil chamber 126 and the second oil return pressure tank 122, so that the vehicle can improve the stability of the vehicle body when driving on uneven road. Through this setting, the driver's road feeling, the stability of the vehicle operation and the comfort of the passengers can be effectively improved.

[0040] Specifically, first, before the vehicle is driven, all the electromagnetic control valves are in the closed state, the fifth electromagnetic control valve 154 and the first electromagnetic control valve 150 are opened, and a small amount of first preset hydraulic oil is injected from the hydraulic oil tank 130 into the first gas cavity 115 and the second gas cavity 125 through the high-pressure oil pump 131, the fourth delivery pipeline and the first delivery pipeline 140 to lubricate the space between the first piston body 114 and the inner cylinder wall of the front suspension hydraulic cylinder 110 and the space between the second piston body 124 and the inner cylinder wall of the rear suspension hydraulic cylinder 120, and then the fifth electromagnetic control valve 154 is closed; then, the fourth electromagnetic control valve 153 is opened, and the high-pressure gas with a content of the first high-pressure gas preset value is added into the first gas cavity 115 and the second gas cavity 125 through the high-pressure gas pump 133, and the high-pressure gas with a content of the first high-pressure gas preset value in the first gas cavity 115 and the second gas cavity 125 can press the corresponding first piston body 114 and second piston body 124 to the bottom of the front suspension hydraulic cylinder 110 and the rear suspension hydraulic cylinder 120, so that the space of the first oil cavity 116 and the second oil cavity 126 is squeezed to zero, and then the fourth electromagnetic control valve 153 is closed; the sixth electromagnetic control valve 155 and the seventh electromagnetic control valve 156 are opened, and the second preset hydraulic oil is filled into the first oil return pressure tank 112 and the second oil return pressure tank 122 through the high-pressure oil pump 131, and then the sixth electromagnetic control valve 155 and the seventh electromagnetic control valve 156 are closed; after the first gas cavity 115 and the second gas cavity 125 are preliminarily depressurized, the first top cover slides to the first preset position of the front suspension hydraulic cylinder 110, the second top cover slides to the second preset position of the rear suspension hydraulic cylinder 120, and then the space of the first oil cavity 116 and the second oil cavity 126 is increased, the first oil return pressure tank 112 inputs hydraulic oil into the first oil cavity 116 through the fifth delivery pipeline, and the second oil return pressure tank 122 inputs hydraulic oil into the second oil cavity 126 through the sixth delivery pipeline; after the front suspension hydraulic cylinder 110 and the rear suspension hydraulic cylinder 120 are depressurized, the suspensions on the front suspension hydraulic cylinder 110 and the rear suspension hydraulic cylinder 120 may be high and low, for example, when the load on the front suspension hydraulic cylinder 110 is greater than the load on the rear suspension hydraulic cylinder 120, the height of the front suspension hydraulic cylinder 110 will decrease and the height of the rear suspension hydraulic cylinder 120 will increase, at this time, the third electromagnetic control valve 152 is opened and the high-pressure gas pump 133 is started to input pressurized gas into the second oil return pressure tank 122, so that the pressurized gas provides pressure to the second oil return pressure tank 122, and the pressure is delivered from the second oil cavity 126 to the second piston body 124 through the sixth delivery pipeline, so that the second piston body 124 and the cylinder wall of the rear suspension hydraulic cylinder 120 slide, so that the rear suspension hydraulic cylinder 120 descends until the corresponding vehicle body of the rear suspension hydraulic cylinder 120 and the front suspension hydraulic cylinder 110 is balanced, and after the vehicle body posture adjustment is completed, the remaining electromagnetic control valves except the first electromagnetic control valve 150 are closed.

[0041] It should be noted that by first injecting a small amount of hydraulic oil into the first gas cavity 115 and the second gas cavity 125, the lubrication function between the front suspension hydraulic cylinder 110 and the first piston body 114, and the lubrication function between the rear suspension hydraulic cylinder 120 and the second piston body 124 are improved; After adding high-pressure gas with a content of the first high-pressure gas preset value to the first gas cavity 115 and the second gas cavity 125 respectively, the space of the first gas cavity 115 and the second gas cavity 125 reaches the maximum threshold, the first top cover and the second top cover slide to the bottom of the front suspension hydraulic cylinder 110 and the rear suspension hydraulic cylinder 120, and the space of the first oil cavity 116 and the second oil cavity 126 is squeezed to zero, so as to empty the gas in the space below the first top cover in the front suspension hydraulic cylinder 110 and the gas in the space below the second top cover in the rear suspension hydraulic cylinder 120; The second preset hydraulic oil amount filled into the first oil return pressure tank 112 and the second oil return pressure tank 122 by the high-pressure oil pump 131 can leave a certain gap at the top of the first oil return pressure tank 112 and the second oil return pressure tank 122 for storing compressed air, and after the first oil return pressure tank 112 initially introduces hydraulic oil into the first oil cavity 116 again, hydraulic oil can still be stored at the bottom of the first oil return pressure tank 112, avoiding that the gas in the first oil return pressure tank 112 is introduced into the first oil cavity 116. Similarly, after the second oil return pressure tank 122 initially introduces hydraulic oil into the second oil cavity 126, hydraulic oil can still be stored at the bottom of the second oil return pressure tank 122, avoiding that the gas in the second oil return pressure tank 122 is introduced into the second oil cavity 126.

[0042] Referring to FIG. 1, it can be understood that the vehicle suspension damping system further comprises a first adjustable damping valve 113, which is arranged on the fifth delivery pipeline.

[0043] It should be noted that by arranging the first adjustable damping valve 113 on the fifth delivery pipeline, the flow speed and damping of the fluid between the first oil return pressure tank 112 and the first oil cavity 116 are controlled, so that the vehicle body on the front suspension hydraulic cylinder 110 can realize slow lifting and slow descending in the process of descending and ascending, reduce the vibration and impact of the vehicle in the process of driving, and improve the comfort of driving.

[0044] Referring to FIG. 1, it can be understood that the vehicle suspension damping system further comprises a second adjustable damping valve 123, which is arranged on the sixth delivery pipeline.

[0045] It should be noted that by arranging the second adjustable damping valve 123 on the sixth delivery pipeline, the flow speed and damping of the fluid between the second oil return pressure tank 122 and the second oil cavity 126 are controlled, so that the vehicle body on the rear suspension hydraulic cylinder 120 can realize slow lifting and slow descending in the process of descending and ascending, reduce the vibration and impact of the vehicle in the process of driving, and improve the comfort of driving.

[0046] It can be understood that the vehicle suspension damping system further comprises a suspension, a first suspension height sensor, a second suspension height sensor and a control device, the front suspension hydraulic cylinder 110 is arranged at the bottom of the front end of the suspension, the rear suspension hydraulic cylinder 120 is arranged at the bottom of the rear end of the suspension, the first suspension height sensor and the second suspension height sensor are arranged on the suspension, the first suspension height sensor is arranged close to the front end of the suspension, the second suspension height sensor is arranged close to the rear end of the suspension, the first suspension height sensor and the second suspension height sensor are connected with the control device, and the control device is further connected with the first electromagnetic control valve 150, the second electromagnetic control valve 151, the third electromagnetic control valve 152, the fourth electromagnetic control valve 153, the fifth electromagnetic control valve 154, the sixth electromagnetic control valve 155 and the seventh electromagnetic control valve 156 respectively.

[0047] Specifically, the first suspension height sensor is arranged on the suspension of the vehicle above the front suspension hydraulic cylinder 110, and the second suspension height sensor is arranged on the suspension of the vehicle above the rear suspension hydraulic cylinder 120, the first suspension height sensor is used to detect the distance between the front end of the suspension and the ground to generate a first height detection signal and send the first height detection signal to the control device, the second suspension height sensor is used to detect the distance between the rear end of the suspension and the ground to generate a second height detection signal and send the second height detection signal to the control device, and the control device judges the balance of the vehicle body according to the first height detection signal and the second height detection signal. For example, when the detection result shows that the height of the front end of the suspension is higher than the height of the rear end of the suspension, the control device controls the second electromagnetic control valve 151 to open, the high-pressure gas pump 133 pressurizes the first oil return pressure tank 112 through the second delivery pipeline, so as to transmit the pressure to the first oil chamber 116 through the first oil return pressure tank 112 and the fifth delivery pipeline, so as to drive the sliding between the front suspension hydraulic cylinder 110 and the first piston body 114, the front suspension hydraulic cylinder 110 rises, and in turn drives the front end of the suspension on the front suspension hydraulic cylinder 110 to rise, until the front end of the suspension and the rear end of the suspension are balanced.

[0048] In some embodiments, a vehicle body height sensor or a vehicle posture sensor or other device can also be arranged to measure the distance between the vehicle chassis and the ground or the relative height of the chassis and output the data to the control device, without being limited to the embodiments of the present application.

[0049] In some embodiments, referring to FIG. 2, a represents a first liquid level and b represents a second liquid level, the first and second liquid level detection sensors 137 and 138 are arranged on the outer wall of the first and second oil return pressure tanks 112 and 122, respectively, the first liquid level detection sensor 137 is arranged near the top of the corresponding first or second oil return pressure tank 112 or 122, the second liquid level detection sensor 138 is arranged near the bottom of the corresponding first or second oil return pressure tank 112 or 122, the first and second liquid level detection sensors 137 and 138 are connected to the control device, the first liquid level detection sensor 137 is used to monitor the liquid level of the corresponding first or second oil return pressure tank 112 or 122 in real time, to generate a first liquid level detection signal when the hydraulic oil in it reaches or is higher than the first liquid level a, and send the first liquid level detection signal to the control device, the control device closes the corresponding sixth or seventh electromagnetic control valve 155 or 156 according to the first liquid level detection signal, stops the high-pressure oil pump 131 from delivering hydraulic oil to the first or second oil return pressure tank 112 or 122, avoids the amount of hydraulic oil in the first and second oil return pressure tanks 112 and 122 exceeding the second preset amount of hydraulic oil, so that the top of the first and second oil return pressure tanks 112 and 122 each leaves a certain gap for storing compressed air; the second liquid level detection sensor 138 is used to monitor the liquid level of the corresponding first or second oil return pressure tank 112 or 122 in real time, to generate a second liquid level detection signal when the hydraulic oil in it is lower than the second liquid level b, and send the second liquid level detection signal to the control device, the control device opens the sixth or seventh electromagnetic control valve 155 or 156 according to the second liquid level detection signal, to deliver the hydraulic oil in the hydraulic oil storage tank 130 to the first or second oil return pressure tank 112 or 122 through the high-pressure oil pump 131, avoids the amount of hydraulic oil in the first and second oil return pressure tanks 112 and 122 being lower than the second liquid level b, and further avoids the gas in the first or second oil return pressure tank 112 or 122 from entering the corresponding oil chamber.

[0050] Referring to FIGS. 3-5, it can be understood that the vehicle suspension damping system further comprises an electromagnetic relief valve 143, which is in communication with the first and second gas chambers 115 and 125, respectively.

[0051] It should be noted that by setting the electromagnetic relief valve 143, after the gas in the first oil cavity 116 and the second oil cavity 126 is exhausted and the space is extruded to zero, part of the high-pressure gas in the first gas cavity 115 and the second gas cavity 125 is discharged by opening the electromagnetic relief valve 143, so that the front suspension hydraulic cylinder 110 and the rear suspension hydraulic cylinder 120 are both lowered, the space of the first oil cavity 116 and the second oil cavity 126 is increased, and then the first oil return pressure tank 112 can supply oil to the first oil cavity 116, and the second oil return pressure tank 122 can supply oil to the second oil cavity 126.

[0052] In some embodiments, the electromagnetic relief valve 143 is connected with the control device, and the opening or closing of the electromagnetic relief valve 143 can be controlled by the control device.

[0053] Referring to FIGS. 3-5, it can be understood that the vehicle suspension damping system further comprises a first high-pressure gas tank 117 and a second high-pressure gas tank 127, the first high-pressure gas tank 117 is respectively communicated with the first gas cavity 115 and the first conveying pipeline 140 near one end of the first gas cavity 115, and the second high-pressure gas tank 127 is respectively communicated with the second gas cavity 125 and the second conveying pipeline near one end of the second gas cavity 125.

[0054] It should be noted that by setting the first high-pressure gas tank 117, when the height of the front end of the suspension and the rear end of the suspension is different, and the front end of the suspension needs to be lowered, the front suspension hydraulic cylinder 110 is lowered by pressurizing the first oil cavity 116, and at this time the excess gas in the first gas cavity 115 is discharged into the first high-pressure gas tank 117 for storage; similarly, by setting the second high-pressure gas tank 127, when the height of the front end of the suspension and the rear end of the suspension is different, and the rear end of the suspension needs to be lowered, the rear suspension hydraulic cylinder 120 is lowered by pressurizing the second oil cavity 126, and at this time the excess gas in the second gas cavity 125 is discharged into the second high-pressure gas tank 127 for storage.

[0055] It should be noted that when the vehicle is loaded with goods and people, and the distance or height from the ground or axle of the vehicle body sensor above the front suspension hydraulic cylinder 110 and the rear suspension hydraulic cylinder 120 is different due to the different front and rear weight distribution of the vehicle, the high-pressure gas pump 133 is started to input high-pressure gas of different pressures to the corresponding oil return pressure tank of each front, rear, left and right oil cavity until the vehicle body reaches a certain attitude value or approaches a horizontal value, and at the same time, high-pressure air is input or discharged to each gas cavity to make the whole vehicle body reach a certain height, and then the high-pressure gas pump 133 is closed. During the driving process of the vehicle, the high-pressure gas pump 133 and the high-pressure oil pump 131 do not work again, and the above actions are repeated when the vehicle is loaded with goods and people again to adjust the height and levelness of the vehicle body.

[0056] Referring to FIGS. 3-5, it can be understood that the vehicle suspension damping system further comprises an eighth electromagnetic control valve 157, which is arranged on the first delivery pipeline 140 and is arranged close to the second high-pressure gas tank 127.

[0057] In some embodiments, the eighth electromagnetic control valve 157 is connected with the control device, and by controlling the opening or closing of the eighth electromagnetic control valve 157, it is determined whether the high-pressure gas pump 133 can pass the high-pressure gas to the second gas cavity 125 through the eighth electromagnetic control valve 157 and the second high-pressure gas tank 127.

[0058] Referring to FIGS. 3-5, it can be understood that the vehicle suspension damping system further comprises a third high-pressure gas tank 134 and a ninth delivery pipeline, the third high-pressure gas tank 134 is communicated with the high-pressure gas pump 133 through the ninth delivery pipeline, and the third high-pressure gas tank 134 is further communicated with the second delivery pipeline, the third delivery pipeline and the fourth delivery pipeline at one end close to the high-pressure gas pump 133.

[0059] It should be noted that by arranging the third high-pressure gas tank 134, high-pressure gas can be first introduced into the third high-pressure gas tank 134 through the high-pressure gas pump 133 for temporary storage, the second electromagnetic control valve 151, the third electromagnetic control valve 152 and the fourth electromagnetic control valve 153 are arranged at one end of the third high-pressure gas tank 134 away from the high-pressure gas pump 133, by controlling the second electromagnetic control valve 151 to open, the high-pressure gas in the third high-pressure gas tank 134 can be pressurized into the first oil return pressure tank 112; by controlling the third electromagnetic control valve 152 to open, the high-pressure gas in the third high-pressure gas tank 134 can be pressurized into the second oil return pressure tank 122; by controlling the fourth electromagnetic control valve 153 to open, the high-pressure gas in the third high-pressure gas tank 134 can be delivered to the first high-pressure gas tank 117 and the first gas cavity 115 corresponding thereto, the second high-pressure gas tank 127 and the second gas cavity 125 corresponding thereto through the first delivery pipeline 140.

[0060] Referring to FIGS. 3-5, it can be understood that the vehicle suspension damping system further comprises a check valve 135, which is arranged between the third high-pressure gas tank 134 and the high-pressure gas pump 133 and is arranged on the ninth delivery pipeline.

[0061] It should be noted that the check valve 135 refers to a valve with a circular valve clack as the opening and closing part and relying on its own weight and medium pressure to act to block the backflow of gas delivered from the high-pressure gas pump 133 to the third high-pressure gas tank 134, so that only high-pressure gas can be delivered from the high-pressure gas pump 133 to the third high-pressure gas tank 134 between the high-pressure gas pump 133 and the third high-pressure gas tank 134, avoiding the backflow of the medium delivered to the third high-pressure gas tank 134.

[0062] For example, referring to FIG. 3, for the application scenario of a two-axle vehicle; the vehicle suspension damping system of the two-axle vehicle includes a first suspension damping structure, a second suspension damping structure, a left-right connecting pipeline 141, a hydraulic oil storage tank 130, a high-pressure oil pump 131, an oil pump electromagnetic control valve 132, a high-pressure gas pump 133, a check valve 135, a third high-pressure gas tank 134, a gas pump electromagnetic control valve 136, an electromagnetic pressure relief valve 143, and a pipeline electromagnetic control valve 142. The first suspension damping structure and the second suspension damping structure are the same, A1 in FIG. 3 represents the first suspension damping structure, and A2 represents the second suspension damping structure. Both the first suspension damping structure and the second suspension damping structure include a front suspension hydraulic cylinder 110, a rear suspension hydraulic cylinder 120, and their corresponding front wheel 111, first high-pressure gas tank 117, first adjustable damping valve 113, first delivery pipeline 140, first electromagnetic control valve 150, sixth electromagnetic control valve 155, first oil return pressure tank 112, first piston body 114, fifth delivery pipeline, rear wheel 121, second high-pressure gas tank 127, second adjustable damping valve 123, second delivery pipeline, eighth electromagnetic control valve 157, seventh electromagnetic control valve 156, second oil return pressure tank 122, second piston body 124, sixth delivery pipeline, seventh delivery pipeline, and eighth delivery pipeline. The first suspension damping structure and the second suspension damping structure are symmetrically arranged at both ends of the left-right connecting pipeline 141. One end of the left-right connecting pipeline 141 is in communication with the middle part of the first delivery pipeline 140 in the first suspension damping structure, and the other end of the left-right connecting pipeline 141 is in communication with the middle part of the first delivery pipeline 140 in the second suspension damping structure. The hydraulic oil storage tank 130 is connected to the high-pressure oil pump 131 and the oil pump electromagnetic control valve 132 in sequence. The end of the oil pump electromagnetic control valve 132 away from the high-pressure oil pump 131 is connected to the left-right connecting pipeline 141. The high-pressure gas pump 133, the check valve 135, the third high-pressure gas tank 134, and the gas pump electromagnetic control valve 136 are arranged in the ninth delivery pipeline in sequence. The end of the ninth delivery pipeline away from the gas pump electromagnetic control valve 136 is in communication with the left-right connecting pipeline 141. The electromagnetic pressure relief valve 143 and the pipeline electromagnetic control valve 142 are both arranged on the left-right connecting pipeline 141. The pipeline electromagnetic control valve 142 is arranged between the ninth delivery pipeline and the first delivery pipeline 140 of the first suspension damping structure. The electromagnetic pressure relief valve 143 is arranged between the ninth delivery pipeline and the first delivery pipeline 140 of the second suspension damping structure.

[0063] It should be noted that when the electromagnetic pressure relief valve 143 works, the pipeline electromagnetic control valve 142 is opened, and the high-pressure air in the front and rear upper chambers on both sides is simultaneously relieved, and after the relief is completed, the pipeline electromagnetic control valve 142 is closed. During normal driving, the pipeline electromagnetic control valve 142 is in a closed state to prevent the vehicle body from tilting to the side during high-speed turning; only when driving at low speed, the pipeline electromagnetic control valve 142 is opened to reduce excessive body swing to the left and right due to bumps; when driving beyond a certain speed, the speed sensor will automatically close the pipeline electromagnetic control valve 142. The pipeline electromagnetic control valve 142 can also be manually closed in advance.

[0064] Specifically, the specific working steps of the vehicle suspension damping system of the two-axle vehicle are as follows: Step 1: open the pipeline electromagnetic control valve 142, the oil pump electromagnetic control valve 132, the two first electromagnetic control valves 150 and the two second electromagnetic control valves 151, start the high-pressure oil pump 131, and use the high-pressure oil pump 131 to deliver a small amount of hydraulic oil in the hydraulic oil storage tank 130 to all the first air chambers 115 and the second air chambers 125, respectively, to lubricate the space between the first top cover and the inner wall of the front suspension hydraulic cylinder 110 and the space between the second top cover and the inner wall of the rear suspension hydraulic cylinder 120, and then close the oil pump electromagnetic control valve 132; Step 2: open the check valve 135 and the air pump electromagnetic control valve 136, start the high-pressure air pump 133 to inject high-pressure air into the two first air chambers 115 and the two second air chambers 125, respectively, so that the vehicle body of the two-axle vehicle is raised to the highest point, the air in the first oil chamber 116 and the second oil chamber 126 is discharged to the first oil return pressure tank 112 and the second oil return pressure tank 122, respectively, after that, close the first electromagnetic control valve 150, the eighth electromagnetic control valve 157, the pipeline electromagnetic control valve 142, the air pump electromagnetic control valve 136 and the check valve 135, and stop the high-pressure air pump 133; Step 3: open the oil pump electromagnetic control valve 132, the sixth electromagnetic control valve 155, the seventh electromagnetic control valve 156 and the pipeline electromagnetic control valve 142, start the high-pressure oil pump 131 to inject a second preset amount of hydraulic oil into the two first oil return pressure tanks 112 and the two second oil return pressure tanks 122, respectively, after that, close the oil pump electromagnetic control valve 132, the sixth electromagnetic control valve 155 and the seventh electromagnetic control valve 156, and stop the high-pressure oil pump 131; Step 4: open the first electromagnetic control valve 150, the eighth electromagnetic control valve 157, the pipeline electromagnetic control valve 142 and the air pump electromagnetic control valve 136, open the electromagnetic relief valve 143 that controls each first high-pressure gas tank 117 and second high-pressure gas tank 127, and relieve the pressure of each first air chamber 115 and second air chamber 125, so that the vehicle body of the two-axle vehicle is lowered to a certain height, then close the electromagnetic relief valve 143 and the air pump electromagnetic control valve 136, at this time, due to the different weights of the vehicle body of the two-axle vehicle in front, back, left and right directions, the suspension height sensors are arranged on the vehicle body chassis above each front suspension hydraulic cylinder 110 and rear suspension hydraulic cylinder 120, each suspension height sensor is connected with the control device, the heights of the vehicle body in front, back, left and right directions are determined by the control device, the high-pressure air pump 133 is controlled to pressurize the corresponding first oil return pressure tank 112 or second oil return pressure tank 122 according to the height detection data, so as to drive the first oil return pressure tank 112 or second oil return pressure tank 122 to pressurize the corresponding first oil chamber 116 or second oil chamber 126, so that the corresponding first piston body 114 and the cylinder wall of the front suspension hydraulic cylinder 110, or the second piston body 124 and the cylinder wall of the rear suspension hydraulic cylinder 120 slide, and then the height of the corresponding vehicle body is adjusted.Step five: according to the adjustment results, open the first electromagnetic control valve 150, the second electromagnetic control valve 151 and the pipeline electromagnetic control valve 142, and according to the current four angle body height data of the two-axle vehicle, if the body height data is not ideal, the first electromagnetic control valve 150 and the second electromagnetic control valve 151 can be closed again, and then the corresponding four piston lower chambers are pressurized and the corresponding electromagnetic control valves are closed, the first electromagnetic control valve 150 and the eighth electromagnetic control valve 157 are opened, the vehicle body state is observed again, and the above operation is repeated until the four angle heights of the two-axle vehicle body are consistent.

[0065] It should be noted that for a two-axle vehicle, the first electromagnetic control valve 150 and the eighth electromagnetic control valve 157 are normally open under normal working conditions. The height of the vehicle body can be adjusted by opening the check valve 135 and the air pump electromagnetic control valve 136. Only when the vehicle is in emergency braking, the first electromagnetic control valve 150 or the eighth electromagnetic control valve 157 can be closed through the electric signal of the brake pedal, and the first electromagnetic control valve 150 and the eighth electromagnetic control valve 157 can also be closed synchronously to prevent the vehicle from nodding too much due to emergency braking. The first electromagnetic control valve 150 and the eighth electromagnetic control valve 157 can also be manually closed when driving on special road sections such as uphill and downhill. The pipeline electromagnetic control valve 142 is normally closed to prevent the vehicle body from tilting severely when turning at high speed. Only when driving at low speed on rough roads, the pipeline electromagnetic control valve 142 can be opened to reduce the left and right shaking of the vehicle body caused by road bumps.

[0066] It should be noted that the weight of the vehicle body includes the weight of the goods or personnel, which is mainly supported by the high-pressure gas in the first gas cavity 115 and the second gas cavity 125. Since the first high-pressure gas tank 117 and the second high-pressure gas tank 127 of the first gas cavity 115 and the second gas cavity 125 on the front wheels 111 and the rear wheels 121 of the vehicle designed in the present application are connected in series through the first delivery pipeline 140, when the upper part of the vehicle body moves up and down when the front wheels 111 and / or the rear wheels 121 encounter uneven road surfaces, the vibration direction of the front wheels 111 and the rear wheels 121 is opposite and the vibration amplitude is the same, which can completely offset the impact force from the uneven road surface through the first delivery pipeline 140. If the first delivery pipeline 140 is not provided, the vehicle body will produce a reciprocating motion of the front rising and the rear falling, that is, angular vibration. By providing the first delivery pipeline 140, when the front wheels 111 encounter an obstacle, half of the impact force can be transmitted to the rear wheels 121 to decompose the impact force it receives. If the first delivery pipeline 140 is not connected, the front wheels 111 will receive greater impact force. At the same time, after the first delivery pipeline 140 is provided, when the weight of the front and rear of the vehicle body or the weight of the load carrying is not consistent, the phenomenon of high front and low rear or low front and high rear will occur. The high-pressure gas pump 133 stabilizes the relative position of the front suspension hydraulic cylinder 110 and the corresponding first piston body 114, or the rear suspension hydraulic cylinder 120 and the corresponding second piston body 124 by the force of pushing the first piston body 114 or the second piston body 124 to move upward, overcoming the instability of the distance between the front and rear wheels and the corresponding upper part of the vehicle caused by the connection of the first gas cavity 115 and the second gas cavity 125. At the same time, the oil in the first oil cavity 116 and the second oil cavity 126 forms a set of damping system through the first adjustable damping valve 113 and the second adjustable damping valve 123 installed on the fifth delivery pipeline and the sixth delivery pipeline. Its principle is that when the wheels encounter uneven road conditions and drive the first piston body 114 and the second piston body 124 to move up and down violently, the heat generated by the slow flow of oil through the corresponding first adjustable damping valve 113 or second adjustable damping valve 123 prevents the first piston body 114 and the second piston body 124 from moving up and down violently, thereby enhancing the smoothness of the vehicle body and the maneuverability and maneuverability of the driving process.

[0067] For example, referring to FIG. 4, for the application scenario of a three-axle vehicle; the vehicle suspension damping system of the three-axle vehicle includes a third suspension damping structure, a fourth suspension damping structure, left and right connecting pipelines 141, a hydraulic oil storage tank 130, a high-pressure oil pump 131, an oil pump electromagnetic control valve 132, a high-pressure gas pump 133, a check valve 135, a third high-pressure gas storage tank 134, a gas pump electromagnetic control valve 136, an electromagnetic pressure relief valve 143, and a pipeline electromagnetic control valve 142. The third suspension damping structure and the fourth suspension damping structure are the same, A3 in FIG. 4 represents the third suspension damping structure, and A4 represents the fourth suspension damping structure. Both the third suspension damping structure and the fourth suspension damping structure include a front suspension hydraulic cylinder 110, a first suspension hydraulic cylinder 163, a rear suspension hydraulic cylinder 120, and their corresponding front wheel 111, first high-pressure gas storage tank 117, first adjustable damping valve 113, first delivery pipeline 140, first electromagnetic control valve 150, sixth electromagnetic control valve 155, first oil return pressure tank 112, first piston body 114, fifth delivery pipeline, rear wheel 121, second high-pressure gas storage tank 127, second adjustable damping valve 123, second delivery pipeline, eighth electromagnetic control valve 157, seventh electromagnetic control valve 156, second oil return pressure tank 122, second piston body 124, sixth delivery pipeline, seventh delivery pipeline, eighth delivery pipeline, first wheel 160, third adjustable damping valve 161, tenth delivery pipeline, and eleventh delivery pipeline. The first suspension hydraulic cylinder 163 is internally provided with a third piston body 164, which includes a third piston rod and a third top cover. The third top cover abuts the inner wall of the first suspension hydraulic cylinder 163 and divides the interior of the first suspension hydraulic cylinder 163 into a third gas cavity 165 and a third oil cavity 166. The third gas cavity 165 is arranged above the third top cover, and the third oil cavity 166 is arranged below the third top cover. One end of the third piston rod is connected to the bottom of the third top cover, and the other end of the third piston rod extends out of the top of the front suspension hydraulic cylinder 110 and is connected to the first wheel 160. The connection relationship between the structures of the front suspension hydraulic cylinder 110, the first oil return pressure tank 112, the first high-pressure gas storage tank 117, the second high-pressure gas storage tank 127, the rear suspension hydraulic cylinder 120, and the second oil return pressure tank 122 is the same as that in the first aspect of the embodiment described above. The third gas cavity 165 communicates with the first high-pressure gas storage tank 117 through the eleventh delivery pipeline, the third oil cavity 166 is connected to the output end of the hydraulic oil storage tank 130 through the tenth delivery pipeline, the third adjustable damping valve 161 is arranged on the tenth delivery pipeline, and the third adjustable damping valve 161 is arranged close to the third oil cavity 166.The first suspension damping structure and the second suspension damping structure are symmetrically arranged at two ends of the left-right connecting pipeline 141, one end of the left-right connecting pipeline 141 is in communication with the middle part of the first conveying pipeline 140 in the first suspension damping structure, the other end of the left-right connecting pipeline 141 is in communication with the middle part of the first conveying pipeline 140 in the second suspension damping structure, the hydraulic oil storage tank 130 is connected with the high-pressure oil pump 131 and the oil pump electromagnetic control valve 132 in sequence, one end of the oil pump electromagnetic control valve 132 away from the high-pressure oil pump 131 is connected to the left-right connecting pipeline 141, the high-pressure gas pump 133, the check valve 135, the third high-pressure gas tank 134 and the gas pump electromagnetic control valve 136 are arranged in the ninth conveying pipeline in sequence, one end of the ninth conveying pipeline away from the gas pump electromagnetic control valve 136 is in communication with the left-right connecting pipeline 141, the electromagnetic pressure relief valve 143 and the pipeline electromagnetic control valve 142 are arranged on the left-right connecting pipeline 141, and the pipeline electromagnetic control valve 142 and the electromagnetic pressure relief valve 143 are arranged between the ninth conveying pipeline and the first conveying pipeline 140 of the second suspension damping structure.

[0068] It should be noted that the middle axle of the three-axle vehicle only plays a role in bearing part of the weight of the vehicle body. Because the middle axle is the force point of the middle part of the vehicle body of the three-axle vehicle, the lower chamber of the piston of the first suspension hydraulic cylinder 163, i.e., the third oil cavity 166, is not provided with a high-pressure gas tank, because it is not needed to balance the vehicle body, but the piston will also move up and down violently when encountering uneven road surfaces, so a third adjustable damping valve 161 is arranged on the tenth conveying pipeline to reduce the shock. The first oil cavity 116 corresponding to the front suspension hydraulic cylinder 110 and the second oil cavity 126 corresponding to the rear suspension hydraulic cylinder 120 are configured with the first oil return pressure tank 112 and the second oil return pressure tank 122 in communication with the high-pressure gas pump 133 to balance the vehicle body, and the first adjustable damping valve 113 and the second adjustable damping valve 123 are also arranged, and the adjustment method of the vehicle body balance is the same as the adjustment method of the vehicle body balance of the two-axle vehicle.

[0069] In some embodiments, the lower chamber of the middle axle of the three-axle vehicle also needs high-pressure gas in the high-pressure gas tank to balance the vehicle body, and the first suspension hydraulic cylinder 163 and the rear suspension hydraulic cylinder 120 in the three-axle vehicle can share the second high-pressure gas tank 127, which is not limited to the embodiments of the present application.

[0070] For example, referring to FIG. 5, the application scenario of a four-axle vehicle; the vehicle suspension damping system of the four-axle vehicle includes a fifth suspension damping structure, a sixth suspension damping structure, left and right connecting pipelines 141, a hydraulic oil storage tank 130, a high-pressure oil pump 131, an oil pump electromagnetic control valve 132, a high-pressure gas pump 133, a check valve 135, a third high-pressure gas storage tank 134, a gas pump electromagnetic control valve 136, an electromagnetic pressure relief valve 143, and a pipeline electromagnetic control valve 142. The fifth suspension damping structure and the sixth suspension damping structure are the same. A5 in FIG. 5 represents the fifth suspension damping structure, and A6 represents the sixth suspension damping structure. Both the fifth suspension damping structure and the sixth suspension damping structure include a front suspension hydraulic cylinder 110, a first suspension hydraulic cylinder 163, a rear suspension hydraulic cylinder 120, a second suspension hydraulic cylinder 173, and their corresponding front wheel 111, first high-pressure gas storage tank 117, first adjustable damping valve 113, first delivery pipeline 140, first electromagnetic control valve 150, sixth electromagnetic control valve 155, first oil return pressure tank 112, first piston body 114, fifth delivery pipeline, rear wheel 121, second high-pressure gas storage tank 127, second adjustable damping valve 123, second delivery pipeline, eighth electromagnetic control valve 157, seventh electromagnetic control valve 156, second oil return pressure tank 122, second piston body 124, sixth delivery pipeline, seventh delivery pipeline, eighth delivery pipeline, first wheel 160, third adjustable damping valve 161, eleventh delivery pipeline, fourth adjustable damping valve 162, twelfth delivery pipeline, thirteenth delivery pipeline, second wheel 170, fifth adjustable damping valve 171, fourteenth delivery pipeline, sixth adjustable damping valve 172, fifteenth delivery pipeline, and sixteenth delivery pipeline. The first suspension hydraulic cylinder 163 is internally provided with a third piston body 164, which includes a third piston rod and a third top cover. The third top cover abuts the inner wall of the first suspension hydraulic cylinder 163 and divides the interior of the first suspension hydraulic cylinder 163 into a third gas cavity 165 and a third oil cavity 166. The third gas cavity 165 is arranged above the third top cover, and the third oil cavity 166 is arranged below the third top cover. One end of the third piston rod is connected to the bottom of the third top cover, and the other end of the third piston rod extends out of the top of the first suspension hydraulic cylinder 163 and is connected to the first wheel 160. The second suspension hydraulic cylinder 173 is internally provided with a fourth piston body 174, which includes a fourth piston rod and a fourth top cover. The fourth top cover abuts the inner wall of the second suspension hydraulic cylinder 173 and divides the interior of the second suspension hydraulic cylinder 173 into a fourth gas cavity 175 and a fourth oil cavity 176. The fourth gas cavity 175 is arranged above the fourth top cover, and the fourth oil cavity 176 is arranged below the fourth top cover. One end of the fourth piston rod is connected to the bottom of the fourth top cover, and the other end of the fourth piston rod extends out of the top of the second suspension hydraulic cylinder 173 and is connected to the second wheel 170.The connection relationship between the front suspension hydraulic cylinder 110, the first oil return pressure tank 112, the first high-pressure gas tank 117, the second high-pressure gas tank 127, the rear suspension hydraulic cylinder 120, and the second oil return pressure tank 122, and other structures is the same as that in the first aspect of the embodiment, the third gas cavity 165 is communicated with the first high-pressure gas tank 117 through the eleventh delivery pipeline, the third oil cavity 166 is connected to the output end of the first oil return pressure tank 112 through the twelfth delivery pipeline, the third adjustable damping valve 161 is arranged on the twelfth delivery pipeline, the both ends of the thirteenth delivery pipeline are communicated with the fifth delivery pipeline and the twelfth delivery pipeline respectively, the first adjustable damping valve 113 is arranged between the first oil return pressure tank 112 and the connection position of the first oil return pressure tank 112 and the thirteenth delivery pipeline, the third adjustable damping valve 161 is arranged between the first oil return pressure tank 112 and the connection position of the first oil return pressure tank 112 and the thirteenth delivery pipeline, and the fourth adjustable damping valve 162 is arranged on the thirteenth delivery pipeline; the fourth gas cavity 175 is communicated with the second high-pressure gas tank 127 through the fourteenth delivery pipeline, the fourth oil cavity 176 is connected to the output end of the second oil return pressure tank 122 through the fifteenth delivery pipeline, the fourth adjustable damping valve 162 is arranged on the fifteenth delivery pipeline, the both ends of the sixteenth delivery pipeline are communicated with the sixth delivery pipeline and the fifteenth delivery pipeline respectively, the second adjustable damping valve 123 is arranged between the second oil return pressure tank 122 and the connection position of the second oil return pressure tank 122 and the sixteenth delivery pipeline, the fifth adjustable damping valve 171 is arranged between the second oil return pressure tank 122 and the connection position of the second oil return pressure tank 122 and the sixteenth delivery pipeline, and the sixth adjustable damping valve 172 is arranged on the sixteenth delivery pipeline; the first suspension damping structure and the second suspension damping structure are symmetrically arranged at the both ends of the left-right connection pipeline 141, one end of the left-right connection pipeline 141 is communicated with the middle part of the first delivery pipeline 140 in the first suspension damping structure, the other end of the left-right connection pipeline 141 is communicated with the middle part of the first delivery pipeline 140 in the second suspension damping structure, the hydraulic oil storage tank 130 is connected with the high-pressure oil pump 131 and the oil pump electromagnetic control valve 132 in sequence, one end of the oil pump electromagnetic control valve 132 away from the high-pressure oil pump 131 is connected to the left-right connection pipeline 141, the high-pressure gas pump 133, the check valve 135, the third high-pressure gas tank 134, and the gas pump electromagnetic control valve 136 are arranged on the ninth delivery pipeline in sequence, one end of the ninth delivery pipeline away from the gas pump electromagnetic control valve 136 is communicated with the left-right connection pipeline 141, the pipeline electromagnetic control valve 142 and the electromagnetic relief valve 143 are arranged on the left-right connection pipeline 141, and the pipeline electromagnetic control valve 142 and the electromagnetic relief valve 143 are arranged between the ninth delivery pipeline and the first delivery pipeline 140 of the second suspension damping structure.

[0071] It should be noted that the current suspension hydraulic cylinder 110 and the first suspension hydraulic cylinder 163 are simultaneously jolted and synchronously up and down, the flow rate and damping of the fluid are controlled through the first adjustable damping valve 113 and the third adjustable damping valve 161, so as to achieve the purpose of stabilizing the fluid dynamic performance and realize the damping effect, when the current suspension hydraulic cylinder 110 and the first suspension hydraulic cylinder 163 are jolted and alternately lifted in opposite directions, the damping is further reduced through the fourth adjustable damping valve 162, so that the fluid is more easily passed; when the rear suspension hydraulic cylinder 120 and the second suspension hydraulic cylinder 173 are simultaneously jolted and synchronously up and down, the flow rate and damping of the fluid are controlled through the fifth adjustable damping valve 171 and the second adjustable damping valve 123, so as to achieve the purpose of stabilizing the fluid dynamic performance and realize the damping effect, when the rear suspension hydraulic cylinder 120 and the second suspension hydraulic cylinder 173 are jolted and alternately lifted in opposite directions, the damping is further reduced through the sixth adjustable damping valve 172, so that the fluid is more easily passed.

[0072] Specifically, when the front wheel 111 and the first wheel 160 are up and down in the uneven road, the pressure of the high-pressure air in the first air chamber 115 and the third air chamber 165 will not increase, the total volume will not change, and the elastic potential energy of the front wheel 111 and the first wheel 160 will not change, that is, it will not increase, so the hydraulic oil in the first oil chamber 116 and the third oil chamber 166 needs to flow slowly, at this time, the damping needs to be small, so the fourth adjustable damping valve 162 is increased, when the front wheel 111 and the first wheel 160 are simultaneously upward, the high-pressure air in the upper chamber will be compressed to generate a certain elastic potential energy (part of the elastic potential energy is transmitted to the rear wheel 121 and the second wheel 170), in order to prevent rebound, the hydraulic oil in the first oil chamber 116 and the third oil chamber 166 flows slowly through the first adjustable damping valve 113 and the third adjustable damping valve 161 to generate heat and consume the elastic potential energy, at this time, the fourth adjustable damping valve 162 does not work, and no hydraulic oil flows through.

[0073] It should be noted that the pistons of the first oil chamber 116 and the third oil chamber 166 of the first axle and the second axle of the four-axle vehicle share a first oil return pressure tank 112, and the pistons of the second oil chamber 126 and the fourth oil chamber 176 of the third axle and the fourth axle share a second oil return pressure tank 122. The balance of the body of the four-axle vehicle is also adjusted by injecting unequal air pressure into the first oil return pressure tank 112 and the second oil return pressure tank 122 to adjust the balance of the body, and the height of the body is adjusted by the size of the air pressure of each air chamber. The use of the first electromagnetic control valve 150, the eighth electromagnetic control valve 157 and the pipeline electromagnetic control valve 142 is the same as that of FIG. 3 and FIG. 4.

[0074] It should be noted that for a single axle vehicle, the second electromagnetic control valve 151, the third electromagnetic control valve 152 and the fourth electromagnetic control valve 153 are provided to control whether the high-pressure gas pump 133 injects high-pressure gas into the first oil return pressure tank 112, the second oil return pressure tank 122 and the first delivery pipeline 140, respectively; for a double axle vehicle, a three axle vehicle and a four axle vehicle, the cooperation among the pipeline electromagnetic control valve 142, the gas pump electromagnetic control valve 136, the sixth electromagnetic control valve 155 and the seventh electromagnetic control valve 156 is used to control whether the high-pressure gas pump 133 injects high-pressure gas into the first oil return pressure tank 112, the second oil return pressure tank 122 and the first delivery pipeline 140, respectively.

[0075] Another embodiment of the present application also provides a vehicle, which comprises the vehicle suspension damping system according to any one of the above embodiments, and further comprises a brake pedal, which is electrically connected with the first electromagnetic control valve 150 in the vehicle suspension damping system.

[0076] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present description, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0077] The above is the preferred embodiment of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which are also considered to be within the scope of the present application.

[0078] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A vehicle suspension damping system, characterized by, The hydraulic cylinder for front suspension, the hydraulic cylinder for rear suspension, the front wheel, the rear wheel, the first conveying pipeline, the second conveying pipeline, the third conveying pipeline, the fourth conveying pipeline, the fifth conveying pipeline, the sixth conveying pipeline, the seventh conveying pipeline, the eighth conveying pipeline, the high-pressure gas pump, the high-pressure oil pump, the hydraulic oil storage tank, the first oil return pressure tank and the second oil return pressure tank are included. The first piston body is arranged in the hydraulic cylinder for front suspension, and the first piston body comprises a first piston rod and a first top cover. The second piston body is arranged in the hydraulic cylinder for rear suspension, and the second piston body comprises a second piston rod and a second top cover. The first conveying pipeline is in communication with the first gas cavity and the second gas cavity, and a first electromagnetic control valve is arranged on the first conveying pipeline. The second conveying pipeline is in communication with the high-pressure gas pump, and the other end of the second conveying pipeline is in communication with the first oil return pressure tank through the top of the first oil return pressure tank. The third conveying pipeline is in communication with the high-pressure gas pump, and the other end of the third conveying pipeline is in communication with the second oil return pressure tank through the top of the second oil return pressure tank. The fourth conveying pipeline is in communication with the high-pressure gas pump and the high-pressure oil pump. The fourth electromagnetic control valve is arranged between the high-pressure gas pump and the first conveying pipeline. The fifth electromagnetic control valve is arranged close to the high-pressure oil pump. One end of the fifth conveying pipeline is communicated with the first oil cavity, the other end of the fifth conveying pipeline is communicated with the first oil return pressure tank through the bottom of the first oil return pressure tank, one end of the sixth conveying pipeline is communicated with the second oil cavity, the other end of the sixth conveying pipeline is communicated with the second oil return pressure tank through the bottom of the second oil return pressure tank, two ends of the seventh conveying pipeline are communicated with the first oil return pressure tank and the high-pressure oil pump respectively, the sixth electromagnetic control valve is arranged on the seventh conveying pipeline, two ends of the eighth conveying pipeline are communicated with the second oil return pressure tank and the high-pressure oil pump respectively, the seventh electromagnetic control valve is arranged on the eighth conveying pipeline, and the hydraulic oil storage tank is communicated with the high-pressure oil pump.

2. The vehicle suspension damping system of claim 1, wherein The vehicle suspension damping system further comprises a first adjustable damping valve arranged on the fifth conveying pipeline.

3. The vehicle suspension damping system of claim 1, wherein The vehicle suspension damping system further comprises a second adjustable damping valve arranged on the sixth conveying pipeline.

4. The vehicle suspension damping system of claim 1, wherein The vehicle suspension damping system further comprises a suspension, a first suspension height sensor, a second suspension height sensor and a control device, the front suspension hydraulic cylinder is arranged at the bottom of the front end of the suspension, the rear suspension hydraulic cylinder is arranged at the bottom of the rear end of the suspension, the first suspension height sensor and the second suspension height sensor are arranged on the suspension, the first suspension height sensor is arranged close to the front end of the suspension, the second suspension height sensor is arranged close to the rear end of the suspension, the first suspension height sensor and the second suspension height sensor are connected with the control device, and the control device is further connected with the first electromagnetic control valve, the second electromagnetic control valve, the third electromagnetic control valve, the fourth electromagnetic control valve, the fifth electromagnetic control valve, the sixth electromagnetic control valve and the seventh electromagnetic control valve respectively.

5. The vehicle suspension damping system of claim 1, wherein The vehicle suspension damping system further comprises an electromagnetic pressure relief valve communicated with the first gas cavity and the second gas cavity respectively.

6. The vehicle suspension damping system of claim 1, wherein The vehicle suspension damping system further comprises a first high-pressure gas tank and a second high-pressure gas tank, the first high-pressure gas tank is communicated with the first gas cavity and one end of the first conveying pipeline close to the first gas cavity respectively, and the second high-pressure gas tank is communicated with the second gas cavity and one end of the second conveying pipeline close to the second gas cavity respectively.

7. The vehicle suspension damping system of claim 6, wherein The vehicle suspension damping system further comprises an eighth electromagnetic control valve arranged on the first conveying pipeline, and the eighth electromagnetic control valve is arranged close to the second high-pressure gas tank.

8. The vehicle suspension damping system of claim 1, wherein The vehicle suspension damping system further comprises a third high-pressure gas tank and a ninth conveying pipeline, the third high-pressure gas tank is communicated with the high-pressure gas pump through the ninth conveying pipeline, and the third high-pressure gas tank is further communicated with one end of the second conveying pipeline, the third conveying pipeline and the fourth conveying pipeline close to the high-pressure gas pump respectively.

9. The vehicle suspension damping system of claim 8, wherein, The vehicle suspension damping system further comprises a check valve arranged between the third high-pressure gas tank and the high-pressure gas pump, and the check valve is arranged on the ninth conveying pipeline.

10. A vehicle characterized by comprising: The vehicle suspension damping system further comprises a check valve arranged between the third high-pressure gas tank and the high-pressure gas pump, and the check valve is arranged on the ninth conveying pipeline. The brake pedal and the vehicle suspension damping system as claimed in any one of claims 1 to 9, the brake pedal is electrically connected with the first electromagnetic control valve in the vehicle suspension damping system.

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