Air path system of air suspension

Abstract

The invention belongs to the technical field of automobile suspensions, and particularly relates to an air suspension air path system which comprises an air storage tank, an air spring, an air supplementing and pressurizing device, a dryer and an exhaust valve, and an air inlet and an air outlet of the air storage tank are respectively communicated with the air spring; the air supply pressurizing device comprises a cylinder body, a sliding piston and a pressurizing air chamber; the cylinder body is provided with an air supply port and a pressurized air outlet; the dryer is provided with a drying cavity as well as a first air port and a second air port which are communicated with the drying cavity; the pressurized air chamber is communicated with a first air port of the dryer through a pressurized air outlet; an air inlet of the air storage tank is communicated with a second air port of the dryer; an air inlet of the exhaust valve is communicated with an inflation inlet and a pressurization air outlet of the air spring; a first one-way valve is arranged at the air supply port; a second one-way valve is arranged on the pressurizing air outlet; an air inlet of the air storage tank is provided with a third one-way valve, and an air outlet of the air storage tank is provided with a And a second electromagnetic valve is arranged at an inflation port of the air spring. And the energy consumption of the vehicle is reduced, and the cost is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile suspension, and in particular relates to an air suspension air circuit system. Background Art

[0002] The main function of the air suspension is to adjust the vehicle height in real time according to the driving environment and load conditions. The basic principle is that the height sensor transmits the vehicle height signal to the vehicle controller. The vehicle controller judges the height change of the vehicle body based on the signal received from the height sensor, and then controls the air compressor to inflate the air spring to stretch the air spring or controls the exhaust solenoid valve to deflate the air spring to achieve height adjustment of the air spring, thereby achieving adjustment of the vehicle chassis ground clearance, ensuring vehicle stability when driving at high speed and passability under complex road conditions.

[0003] In the existing technology, the air suspension air circuit system mainly includes an open-loop air circuit system and a closed-loop air circuit system. The air circuit open-loop suspension system mainly compresses the gas in the atmosphere into high-pressure gas through an air compressor and inputs it into the air spring. There is also a scheme that is provided with an air tank, and the air tank is pre-filled with air through an air compressor. When the system is working, the gas in the air tank is input into the air spring. When the height of the vehicle body is lowered, the high-pressure gas in the air spring is directly discharged into the atmosphere. The air circuit closed-loop suspension system is provided with an air tank. The air compressor is connected to the air tank and the air spring through an air pipe. When the height of the vehicle body is lowered, the high-pressure gas in the air spring is discharged to the air tank for recovery. When the air spring needs to be inflated, the air compressor inflates the air spring with the gas in the air tank, and the gas discharged from the air spring is recycled through the air tank. Although the closed-loop air circuit suspension system reduces the energy consumption of compressed air, it still needs to start the air compressor frequently. The power of most suspension air compressors is about 400W, and the energy consumption is relatively high; the air compressor is large in size, which increases the vehicle's dead weight and the vehicle energy consumption is relatively large. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an air suspension air circuit system, which can recover the gas discharged from the air spring to the air tank, and utilize the relative movement of the vehicle suspension and the wheel frame in the up and down directions to pressurize the external gas and then transport it to the air tank, so as to provide high-pressure gas for the entire system, save energy and protect the environment, reduce vehicle energy consumption, and save costs.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an air suspension air circuit system, comprising an air storage tank and a plurality of air springs, wherein the air inlet and the air outlet of the air storage tank are respectively connected to the charging ports of the air springs;

[0006] It also includes an air supplement and pressurization device, a dryer and an exhaust valve;

[0007] The air-supplementing and pressurizing device comprises a cylinder body with an opening at one end, wherein a sliding piston is arranged in the cylinder body and axially slides with the inner wall thereof, wherein the sliding piston seals with the inner wall of the cylinder body and forms a pressurized air chamber with the inner wall of the cylinder body; an air-supplementing port and a pressurized air outlet are arranged at the sealed end of the cylinder body and communicate with the pressurized air chamber; the dryer comprises a drying chamber and a first air port and a second air port communicated with the drying chamber;

[0008] The pressurized air chamber is connected to the external environment through the air supply port, and the pressurized air chamber is connected to the first air port of the dryer through the pressurized air outlet; the air inlet of the air storage tank is connected to the second air port of the dryer; the air inlet of the exhaust valve is connected to the charging port of the air spring and the pressurized air outlet;

[0009] The air supply port is provided with a first one-way valve for controlling the air flow from the external atmosphere to the pressurized air chamber, and the pressurized air outlet is provided with a second one-way valve for controlling the air flow from the pressurized air chamber to the drying chamber of the dryer; the air inlet of the air storage tank is provided with a third one-way valve for controlling the air flow from the air spring charging port and the dryer to the air storage tank, and the air outlet of the air storage tank is provided with a first solenoid valve; the charging port of the air spring is provided with a second solenoid valve.

[0010] Furthermore, the cylinder body is connected to the vehicle suspension, and the sliding piston is connected to the wheel frame.

[0011] Furthermore, it also includes a pressure sensor for monitoring the air tank, the air spring and the air pressure of the air path therebetween, and the pressure sensor is electrically connected to the vehicle controller.

[0012] Furthermore, a pressure-limiting safety valve is provided on the communicating air path between the pressurized air outlet and the first air port.

[0013] Furthermore, the first solenoid valve and the second solenoid valve are both two-position communicating solenoid valves.

[0014] Furthermore, the sliding piston is connected to a piston rod, and the piston rod extends out of the cylinder body; the diameter of the piston rod is smaller than that of the sliding piston; and an axial limiting portion is provided on the inner side wall of the open end of the cylinder body.

[0015] Furthermore, a filter screen is provided on the air supply port.

[0016] Furthermore, the air supplement and pressure boosting device is provided with at least two groups.

[0017] Furthermore, the air spring comprises a base, a bladder skin and a piston, wherein the piston has a column cavity coaxial therewith and opening downward; the base seals the lower port of the bladder skin, the piston seals the upper port of the bladder skin, and the base, the bladder skin and the piston form an air chamber of the air spring;

[0018] The piston is the cylinder, and the lower end of the piston is the open end of the cylinder;

[0019] The sliding piston is located in the column cavity of the piston and axially slides with the inner wall of the sliding piston. The sliding piston divides the air chamber of the air spring into an upper air chamber and a lower air chamber that are isolated from each other. The upper air chamber is located on the upper side of the sliding piston, and the upper air chamber is the pressurized air chamber. The lower end of the sliding piston is connected to the base.

[0020] Furthermore, the air filling port of the air spring is connected to the second air port on the dryer;

[0021] The dryer is also provided with a third air port communicating with the drying chamber, and the exhaust valve is arranged on the third air port.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: providing an air suspension air circuit system, the present invention uses the movement of the vehicle suspension relative to the wheel frame in the up and down directions to absorb the gas from the external environment and pressurize it and then transport it to the air tank, providing high-pressure gas for the entire system, saving energy and protecting the environment, reducing vehicle energy consumption, and at the same time, buffering the vibration of the vehicle body in the up and down directions, reducing the buffering burden of the air spring and the shock absorber, and improving the driving comfort of the vehicle; by connecting the air inlet of the air tank with the air spring charging port, when the air pressure of the air tank is insufficient, the gas discharged by the air spring can be recovered into the air tank, further ensuring the air filling amount of the air tank. By arranging a pressure-limiting safety valve on the connecting air path between the pressurized air outlet and the first air port, the gas generated by the air-filling and pressurizing device and the time-diameter pressure-limiting safety valve are discharged after the pressure of the air tank reaches the limited value, ensuring the safety and reliability of the entire air circuit system. By arranging the third air port on the dryer, when the air pressure in the air tank reaches the upper limit, the gas discharged from the air spring enters the drying chamber of the dryer through the second air port and is then discharged through the third air port. The water molecules concentrated at the second air port in the drying chamber are blown out through the third air port, so that the desiccant is dried and regenerated, thereby improving the efficiency of the dryer in drying gas and extending the service life of the dryer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0024] Figure 2 It is a schematic structural diagram of an embodiment of the present invention;

[0025] Figure 3 It is a structural schematic diagram of another embodiment of the present invention;

[0026] Figure 4 yes Figure 2 and Figure 3 A schematic diagram of the structure of the air spring and the air supplement and boost device in the embodiment;

[0027] Figure markings: 1-air tank; 2-air spring; 21-base; 22-bladder skin; 23-piston; 3-air supply and boost device; 31-cylinder body; 32-sliding piston; 33-piston rod; 34-axial limiting portion; 35-air supply port; 36-pressurized air outlet; 4-dryer; 41-first air port; 42-second air port; 43-third air port; 5-exhaust valve; 6-pressurized air chamber; 71-pressure sensor; 72-pressure limiting safety valve; 81-first one-way valve; 82-second one-way valve; 83-third one-way valve; 91-first solenoid valve; 92-second solenoid valve. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] As attached Figure 1-4As shown, an air suspension air circuit system includes an air storage tank 1 and a plurality of air springs 2, wherein the air inlet and the air outlet of the air storage tank 1 are respectively connected to the charging port of the air spring 2; it also includes an air supplement and pressurizing device 3, a dryer 4 and an exhaust valve 5; the air supplement and pressurizing device 3 includes a cylinder body 31 with an opening at one end, the cylinder body 31 is provided with a sliding piston 32 axially slidingly matched with the inner side wall thereof, the sliding piston 32 is sealingly matched with the inner side wall of the cylinder body 31 and forms a pressurized air chamber 6 with the inner wall of the cylinder body 31; the sealed end of the cylinder body 31 is provided with an air supplement port 35 and a pressurized air outlet port 36 connected to the pressurized air chamber 6; the dryer 4 has a drying chamber and a first air port 41 and a second air port 42 connected to the drying chamber; the pressurized air chamber 6 is connected to the external environment through the air supplement port 35, and the pressurized air outlet port 36 is formed on the inner side wall of the cylinder body 31. The air chamber 6 is connected with the first air port 41 of the dryer 4 through the pressurized air outlet 36; the air inlet of the air storage tank 1 is connected with the second air port 42 of the dryer 4; the air inlet of the exhaust valve 5 is connected with the charging port of the air spring 2 and the pressurized air outlet 36; the air replenishing port 35 is provided with a first one-way valve 81 for controlling the flow of air from the external atmosphere to the pressurized air chamber 6, and the pressurized air outlet 36 is provided with a second one-way valve 82 for controlling the flow of air from the pressurized air chamber 6 to the drying chamber of the dryer 4; the air inlet of the air storage tank 1 is provided with a third one-way valve 83 for controlling the flow of air from the charging port of the air spring 2 and the dryer 4 to the air storage tank 1, and the air outlet of the air storage tank 1 is provided with a first solenoid valve 91; the charging port of the air spring 2 is provided with a second solenoid valve 92.

[0030] The axis of the cylinder 31 on the air supplement and boosting device 3 should be arranged in the up-down direction. The cylinder 31 can be installed on the wheel frame, and the piston rod 33 can be connected to the vehicle suspension. Preferably, the cylinder 31 is connected to the vehicle suspension, and the piston rod 33 is connected to the wheel frame. The air pipe lead-out and erection position at the pressurized air outlet 36 is raised to facilitate fixing the air pipe on the air suspension.

[0031] The air tank 1 is mainly used to store the high-pressure gas 1 output by the air spring 2 and the air-inflating and boosting device 3, and to provide high-pressure gas for the air spring 2, and to adjust the height of the suspension and the vehicle body by changing the air filling amount of the air spring 2. The air-inflating and boosting device 3 uses the up and down vibration of the vehicle body to provide high-pressure gas to the air tank 1 and to provide power for the air tank 1 to inflate the air into the air spring 2. The first one-way valve 81 is used to allow the gas in the external atmospheric environment to enter the boosting air chamber 6 through the air-inflating port 35, and to prevent the gas in the boosting air chamber 6 from being output from the air-inflating port 35. The drying chamber of the dryer 4 is filled with a desiccant, which is mainly used to absorb the moisture of the high-pressure gas generated by the air-inflating and boosting device 3, dry the high-pressure gas generated by the air-inflating and boosting device 3, and prevent water vapor from entering the air path system to affect the vibration reduction performance of the air spring 2. The exhaust valve 5 is mainly used to discharge the excess gas in the air circuit system, that is, when the gas volume of the gas tank 1 is insufficient, the exhaust valve 5 closes its own outlet; when the gas volume of the gas tank 1 reaches the upper limit, the exhaust valve 5 opens its own outlet, and the high-pressure gas output by the air-compensating booster device 3 and the air spring 2 is discharged from the suspension air circuit system through the outlet of the exhaust valve 5, so as to ensure the normal operation of the suspension system. The second one-way valve 82 is used to allow the gas in the boosting chamber 6 to be output from the pressurized outlet 36, so as to prevent the gas in the external air circuit of the boosting chamber 6 from being input into the boosting chamber 36 from the pressurized outlet 36. The third one-way valve 83 is used to ensure that the gas can be filled into the gas tank 1 from the air inlet of the gas tank 1, so as to prevent the gas in the gas tank 1 from being output from its air inlet. The first solenoid valve 91 is used to control the opening and closing of the outlet of the gas tank 1, and the second solenoid valve 92 is used to control the opening and closing of the charging port of the air spring 2. The first solenoid valve 91 and the second solenoid valve 92 cooperate with each other to complete the charging and exhausting of the air spring 2.

[0032] When the vehicle is traveling on an uneven road, the vehicle body will drive the suspension to vibrate up and down, causing the suspension and the wheel axle to move relative to each other in the up and down directions. While the suspension and the wheel axle drive the air spring 2 to extend and retract, they also drive the sliding piston 32 on the air-filling and boosting device 3 to reciprocate axially in the cylinder 31. When the suspension moves upward relative to the wheel frame, the two move away from each other, causing the sliding piston 32 to move in the cylinder 31 in a direction away from the air-filling port 35, thereby increasing the volume of the pressurized air chamber 6 and reducing the air pressure. In this process, the gas in the air circuit system cannot enter the boosting air chamber 6 from the pressurized air outlet 36, and the gas in the external atmospheric environment enters the pressurized air chamber 6 from the air-filling port 35. When the suspension moves downward relative to the wheel axle, the two move closer to each other, causing the sliding piston 32 to move in the cylinder body 31 toward the air inlet 35 to compress the volume of the boost chamber 6. The air pressure inside the boost chamber 6 gradually increases. During this process, the gas in the boost chamber 6 cannot be output from the air inlet 35. As the sliding piston 32 moves in compression, the gas in the boost chamber 6 is gradually pressurized. The high-pressure gas in the boost chamber 6 is output from the pressurized air outlet 36 and then enters the drying chamber of the dryer 4 through the first air port 41 for drying. The high-pressure gas after drying by the dryer 4 is output from the dryer chamber through the second air port 42 and then enters the air inlet of the air tank 1 for storage.

[0033] When the air spring 2 is inflated, the first solenoid valve 91 opens the air outlet of the air tank 1 and the second solenoid valve 92 opens the charging port of the air spring 2. When the air pressure in the air tank 1 is sufficient, the high-pressure gas in the air tank 1 is output from the air outlet and then input into the working chamber of the air spring 2 through the charging port of the air spring 2, and the high-pressure gas generated by the air replenishing and boosting device 3 is continuously filled into the air tank 1; when the air pressure in the air tank 1 is insufficient, the high-pressure gas generated by the air replenishing and boosting device 3 is dried by the dryer and then filled into the air tank 1, so as to ensure the air pressure in the air tank 1 and provide power for the air tank 1 to inflate the air spring 2. When the air spring 2 is exhausted, the first solenoid valve 91 closes the air outlet of the air tank 1, and the second solenoid valve 92 opens the air charging port of the air spring 2. If the air volume in the air tank 1 is insufficient, the high-pressure gas output by the air spring 2 returns to the air tank 1 through the air inlet of the air tank 1; if the air volume in the air tank 1 is sufficient, the high-pressure gas output by the pressurized air outlet 36 of the air supplement and boosting device 3 and the gas output by the air spring 2 are both discharged by the exhaust valve 5. One exhaust valve 5 may be provided, or multiple exhaust valves 5 may be provided.

[0034] The present invention utilizes the relative movement of the vehicle suspension and the wheel axle in the up-down direction to drive the sliding piston 32 to reciprocate up and down in the column cavity of the cylinder body 1 to suck the gas in the atmospheric environment into the boost chamber 6, which is pressurized and then transported to the air tank 1, providing high-pressure gas for the air suspension air circuit system and providing power for the air tank 1 to inflate the air into the air spring 2, which can save the electric air pump in the existing suspension air circuit system, save costs, and reduce vehicle energy consumption. When the piston 32 compresses the gas in the boost chamber 6, the gas in the boost chamber 6 can absorb part of the kinetic energy of the vehicle body to buffer the vibration of the vehicle body in the up-down direction, reduce the buffering burden of the air spring and the shock absorber, and improve the driving comfort of the vehicle. In addition, when the air pressure of the air tank 1 is insufficient, the gas discharged by the air spring 2 can be recycled into the air tank 1, further saving the energy consumption of the vehicle and ensuring the filling amount of the air tank.

[0035] Preferably, it also includes a pressure sensor 71 for monitoring the air pressure of the air tank 1, the air spring 2 and the air path between the two, and the pressure sensor 71 is electrically connected to the vehicle controller. The pressure sensor 71 transmits the monitored air pressure signal to the vehicle controller in real time. The vehicle controller controls the first solenoid valve 91 and the second solenoid valve 92 in real time according to the received air pressure value signal to realize the opening and closing control of the air outlet of the air tank 1 and the air filling port of the air spring 2, and control the inflation and exhaust of the air spring 2. As a further preference, the pressure sensor can be integrated with a temperature sensor and a flow sensor to detect the temperature and flow of the system, and an accelerometer, a gyroscope, a height change sensor, etc. can also be added to the system. Humidity sensors, temperature sensors and other components can also be set in the air path to monitor the temperature of the air path in real time.

[0036] like Figure 3 As shown, preferably, a pressure-limiting safety valve 72 is provided on the connecting air path between the pressurized air outlet 36 and the first air port 41 on the dryer 4. When the pressure sensor 71 detects that the gas pressure in the air storage tank 1 reaches a preset value, it sends a signal to the vehicle controller. The vehicle controller controls the pressure-limiting safety valve 72 to open according to the received pressure signal. The high-pressure gas output from the air supplement and boosting device 3 is discharged through the pressure-limiting safety valve 72, so that the air pressure in the entire air circuit system is maintained within a safe range, thereby improving the safety and stability of the air suspension air circuit system.

[0037] The first solenoid valve 91 and the second solenoid valve 92 are both two-position two-way solenoid valves, which save costs and facilitate control and installation on the basis of meeting system requirements. If the system pressure requirement is high, the first solenoid valve 91 and the second solenoid valve 92 can also be selected as solenoid valves with pilot function.

[0038] The sliding piston 32 on the air-compensating and boosting device 3 can extend out of the cylinder 31 or be completely located in the cylinder 31. It can be a cylindrical structure or a stepped shaft structure. In order to prevent the sliding piston 32 from being dislodged from the open end of the cylinder 31 due to excessive up-and-down vibration of the vehicle body, resulting in failure of the air-compensating and boosting device 3, preferably, the sliding piston 32 is connected with a piston rod 33, and the piston rod 33 extends out of the cylinder 31; the diameter of the piston rod 33 is smaller than that of the sliding piston 32; and an axial limiter 34 is provided on the inner side wall of the open end of the cylinder 31. The sliding piston 32 is connected to the suspension or the wheel axle through the piston rod 33.

[0039] In order to prevent dust in the atmosphere from entering the boost air chamber 6 through the air supply port 35, preferably, a filter is provided on the air supply port 35, and the filter can be bonded to the cylinder body 31, or installed on the cylinder body 31 by a structure such as screws. The filter can be made of knitted cloth or breathable dustproof cotton. The air supply and boosting device 3 can be set in one group or in multiple groups. Preferably, the air supply and boosting device 3 is provided in multiple groups to ensure that the air volume of the air storage tank 1 is sufficient and improve the reliability of the suspension system.

[0040] The air-compensating and boosting device 3 installed separately on the vehicle suspension needs to occupy a certain installation space. Considering the limited installation space of the suspension, the installation position of the air-compensating and boosting device 3 can be adjusted to make full use of the space of the vehicle suspension. The air spring 2 generally includes a base 21, a bladder skin 22 and a piston 23. The base 21 is connected to the wheel axle and seals the lower port of the bladder skin 22. The piston 23 is connected to the vehicle suspension and seals the upper port of the bladder skin 22. The base 21, the bladder skin 22 and the piston 23 form an air chamber of the air spring 2. Among them, the change in the axial slope of the outer peripheral surface of the piston 23 has an important influence on the stiffness adjustment of the air spring, so the piston 23 is generally a cylindrical structure. Preferably, the piston 23 has a column cavity coaxial with the piston 23 and opening downward, the piston 23 is the cylinder body 31, and the lower end of the piston 23 is the opening end of the cylinder body 31; the sliding piston 32 is located in the column cavity of the piston 23 and axially slides with the inner wall of the sliding piston 32, and the sliding piston 32 separates the air chamber of the air spring 2 into an upper air chamber and a lower air chamber isolated from each other, the upper air chamber is located on the upper side of the sliding piston 32, and the upper air chamber is the pressurized air chamber 6; the lower end of the sliding piston 32 is connected to the base 21. The piston 23 on the air spring 2 replaces the cylinder body 21 to integrate the air supplement and booster device 3 into the air spring 2, saving the suspension installation space and facilitating the arrangement and installation of other components on the suspension.

[0041] When the air-compensating and boosting device 3 delivers high-pressure gas to the gas storage tank 1, the high-pressure gas generated by the air-compensating and boosting device 3 enters the drying chamber from the first air port 41, absorbs moisture in the desiccant, and is output to the gas storage tank 1 from the second air port 42. Under the action of the airflow, the moisture absorbed by the desiccant in the drying chamber is mainly concentrated in the drying chamber near the second air port 42. Figure 2 As shown, preferably, the inflation port of the air spring 2 is connected to the second air port 42 on the dryer 4; the dryer 4 is also provided with a third air port 43 connected to the drying chamber, and the exhaust valve 5 is arranged on the third air port 43, and the exhaust valve 5 is used to control the opening and closing of the third air port 43. When the air pressure in the air storage tank 1 reaches the upper limit, the vehicle controller controls the exhaust valve 5 to open the third air port 43, and the gas discharged from the air spring 2 enters the drying chamber of the dryer 4 through the second air port 42 and is discharged through the third air port 43, and the water molecules concentrated at the second air port 42 in the drying chamber are blown out through the third air port 43, so that the desiccant is dried and regenerated, the efficiency of the dryer 4 in drying the gas is improved, and the service life of the dryer 4 is extended.

[0042] The terms "upper", "lower", "top", "bottom", "inside" and "outside" in the present invention are relative positional relationships and cannot be understood as limitations on specific positions. The embodiments of this specific implementation are all preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An air suspension air circuit system, comprising an air storage tank (1) and a plurality of air springs (2), wherein an air inlet and an air outlet of the air storage tank (1) are respectively connected to an air charging port of the air spring (2); characterized in that: It also includes an air supply and pressure boosting device (3), a dryer (4) and an exhaust valve (5); The air-supplementing and pressurizing device (3) comprises a cylinder body (31) with an opening at one end, wherein a sliding piston (32) is provided in the cylinder body (31) and is axially slidably matched with the inner wall thereof, wherein the sliding piston (32) is sealedly matched with the inner wall of the cylinder body (31) and forms a pressurized air chamber (6) with the inner wall of the cylinder body (31); the sealed end of the cylinder body (31) is provided with an air-supplementing port (35) and a pressurized air outlet (36) which are connected with the pressurized air chamber (6); the dryer (4) comprises a drying chamber and a first air port (41) and a second air port (42) which are connected with the drying chamber; The pressurized air chamber (6) is connected to the external environment through the air supply port (35), and the pressurized air chamber (6) is connected to the first air port (41) of the dryer (4) through the pressurized air outlet (36); the air inlet of the air storage tank (1) is connected to the second air port (42) of the dryer (4); the air inlet of the exhaust valve (5) is connected to the charging port of the air spring (2) and the pressurized air outlet (36); The air supply port (35) is provided with a first one-way valve (81) for controlling the flow of air from the external atmosphere into the pressurized air chamber (6); the pressurized air outlet (36) is provided with a second one-way valve (82) for controlling the flow of air from the pressurized air chamber (6) to the drying chamber of the dryer (4); the air inlet of the air storage tank (1) is provided with a third one-way valve (83) for controlling the flow of air from the air spring (2) charging port and the dryer (4) into the air storage tank (1); the air outlet of the air storage tank (1) is provided with a first solenoid valve (91); and the air charging port of the air spring (2) is provided with a second solenoid valve (92).

2. The air suspension air circuit system according to claim 1, characterized in that: The cylinder body (31) is connected to the vehicle suspension, and the sliding piston (32) is connected to the wheel frame.

3. The air suspension air circuit system according to claim 1, characterized in that: It also includes a pressure sensor (71) for monitoring the air storage tank (1), the air spring (2) and the air pressure of the air path therebetween, and the pressure sensor (71) is electrically connected to the vehicle controller.

4. The air suspension air circuit system according to claim 3, characterized in that: A pressure-limiting safety valve (72) is provided on the communicating air path between the pressurized air outlet (36) and the first air port (41).

5. The air suspension air circuit system according to claim 1, characterized in that: The first solenoid valve (91) and the second solenoid valve (92) are both two-position communicating solenoid valves.

6. The air suspension air circuit system according to claim 1, characterized in that: The sliding piston (32) is connected to a piston rod (33), and the piston rod (33) extends out of the cylinder body (31); the diameter of the piston rod (33) is smaller than that of the sliding piston (32); and an axial limiting portion (34) is provided on the inner side wall of the open end of the cylinder body (31).

7. The air suspension air circuit system according to claim 1, characterized in that: The air supply port (35) is provided with a filter screen.

8. The air suspension air circuit system according to claim 1, characterized in that: The air supplement and pressure increasing device (3) is provided with at least two groups.

9. The air suspension air circuit system according to claim 1, characterized in that: The air spring (2) comprises a base (21), a bladder skin (22) and a piston (23); the piston (23) has a column cavity coaxial with the piston and opening downward; the base (21) seals the lower end of the bladder skin (22), the piston (23) seals the upper end of the bladder skin (22); the base (21), the bladder skin (22) and the piston (23) form an air chamber of the air spring (2); The piston (23) is the cylinder (31), and the lower end of the piston (23) is the open end of the cylinder (31); The sliding piston (32) is located in the column cavity of the piston (23) and axially slides with the inner wall of the sliding piston (32). The sliding piston (32) divides the air chamber of the air spring (2) into an upper air chamber and a lower air chamber that are isolated from each other. The upper air chamber is located on the upper side of the sliding piston (32) and is the pressurized air chamber (6). The lower end of the sliding piston (32) is connected to the base (21).

10. The air suspension air circuit system according to any one of claims 1 to 9, characterized in that: The air filling port of the air spring (2) is in communication with the second air port (42) on the dryer (4); The dryer (4) is also provided with a third air port (43) communicating with the drying chamber, and the exhaust valve (5) is arranged on the third air port (43).

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