Air path system of air suspension

Abstract

The utility model belongs to the technical field of automobile suspensions, and particularly relates to an air path system of an air suspension, which comprises an air storage tank, an air spring, an air supply supercharging 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, a first air port and a second air port, 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 utility model belongs to the technical field of automobile suspension, concretely relates to an air suspension air path system. BACKGROUND

[0002] The main function of the air suspension is to adjust the vehicle body height in real time according to the driving environment and load conditions, and the basic principle is that the height sensor transmits the vehicle body height signal to the vehicle controller, the vehicle controller judges the height change of the vehicle body according to the signal received by the height sensor, 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 realize the height adjustment of the air spring, and further realizes the adjustment of the vehicle chassis ground clearance, so as to ensure the vehicle stability during high-speed driving and the passability under complex road conditions.

[0003] In the prior art, the air suspension air path system mainly includes an open-loop air path system and a closed-loop air path system. The air path open-loop suspension system mainly compresses the gas in the atmosphere into high-pressure gas by an air compressor and inputs the high-pressure gas into the air spring. Some schemes are provided with a gas storage tank, the air storage tank is pre-charged by the air compressor, the gas in the gas storage tank is input into the air spring during system operation, and the high-pressure gas in the air spring is directly discharged into the atmosphere when the vehicle body height is lowered. The air path closed-loop suspension system is provided with a gas storage tank, the air compressor is connected in communication with the gas storage tank and the air spring through a gas pipe, the high-pressure gas in the air spring is discharged into the gas storage tank for recovery when the vehicle body height is lowered, and the air compressor charges the air spring with the gas in the gas storage tank when the air spring needs to be inflated, and the gas discharged from the air spring is recycled through the gas storage tank. Although the closed-loop air path suspension system reduces the energy consumption of compressed air, the air compressor still needs to be frequently started, the power of the air compressor used for most suspensions is about 400W, the energy consumption is high, the air compressor is large in size, the vehicle self-weight is increased, and the vehicle energy consumption is large. UTILITY MODEL CONTENTS

[0004] The utility model wants to solve the technical problem of providing an air suspension air path system, which can recycle the gas discharged from the air spring to the gas storage tank, pressurize the external gas and deliver the gas to the gas storage tank through the relative movement of the vehicle suspension and the wheel frame in the up-down direction, provide high-pressure gas for the whole system, save energy and protect the environment, reduce the vehicle energy consumption and save the cost.

[0005] The utility model adopts the technical scheme that an air suspension air path system comprises a gas storage tank and a plurality of air springs, the gas inlet and the gas outlet of the gas storage tank are connected in communication with the inflation port of the air spring respectively,

[0006] The utility model further comprises a gas supplementing and pressurizing device, a dryer and an exhaust valve.

[0007] The air supplementing and pressurizing device comprises a cylinder body with an open end, a sliding piston axially slidingly fitted with the inner side wall of the cylinder body, the sliding piston being in sealing cooperation with the inner side wall of the cylinder body and forming a pressurized air chamber with the inner wall of the cylinder body; the sealing end of the cylinder body is provided with an air supplementing port and a pressurized air outlet port in communication with the pressurized air chamber; the dryer has a drying cavity and a first air port and a second air port in communication with the drying cavity;

[0008] The pressurized air chamber is in communication with the external environment through the air supplementing port, and the pressurized air chamber is in communication with the first air port of the dryer through the pressurized air outlet port; the air inlet of the air tank is in communication with the second air port of the dryer; the air inlet of the exhaust valve is in communication with the air inlet of the air spring and the pressurized air outlet port;

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

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

[0011] Further, it further comprises a pressure sensor for monitoring the air tank, the air spring and the air pressure between them, and the pressure sensor is electrically connected with the vehicle controller.

[0012] Further, a pressure limiting safety valve is arranged on the communication air path between the pressurized air outlet port and the first air port.

[0013] Further, the first electromagnetic valve and the second electromagnetic valve are both two-position communication electromagnetic valves.

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

[0015] Further, a filter screen is arranged on the air supplementing port.

[0016] Further, the air supplementing and pressurizing device is provided with at least two groups.

[0017] Further, the air spring comprises a base, a bladder and a piston, the piston is provided with a column cavity coaxial with the piston and downwardly open; the base seals a lower end port of the bladder, the piston seals an upper end port of the bladder, and the base, the bladder and the piston enclose an air chamber of the air spring;

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

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

[0020] Further, the air inlet of the air spring is communicated with the second air port on the dryer;

[0021] The dryer is further provided with a third air port communicated with the drying cavity, and the exhaust valve is arranged on the third air port.

[0022] Compared with the prior art, the air suspension air path system has the advantages that: the air suspension air path system is provided with a gas supplementing and pressurizing device, which can utilize the movement of the vehicle suspension in the up-down direction relative to the wheel frame to suck the gas in the external environment, pressurize the gas and then deliver the gas to the gas storage tank, so that high-pressure gas is provided for the whole system, energy saving and environmental protection are achieved, the energy consumption of the vehicle is reduced, the vibration of the vehicle in the up-down direction can be buffered, the buffering burden of the air spring and the shock absorber is reduced, and the driving comfort of the vehicle is improved; when the gas pressure of the gas storage tank is insufficient, the gas discharged from the air spring can be recycled to the gas storage tank, so that the air filling amount of the gas storage tank is further ensured; when the pressure of the gas storage tank reaches a limit value, the gas generated by the gas supplementing and pressurizing device is discharged through the pressure limiting safety valve in time, so that the safety and reliability of the whole air path system are ensured; when the gas pressure in the gas storage tank reaches an upper limit, the gas discharged from the air spring is discharged from the third air port after entering the drying cavity of the dryer through the second air port, so that the water molecules concentrated at the second air port in the drying cavity are blown out through the third air port, the drying agent is dried and regenerated, the drying efficiency of the dryer is improved, and the service life of the dryer is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of an embodiment of the utility model;

[0024] Figure 2 is a structural schematic diagram of an embodiment of the utility model;

[0025] Figure 3 is a structural schematic view of another embodiment of the utility model;

[0026] Figure 4 is Figure 2 and Figure 3 a structural schematic view of the air spring and air supplementing and pressurizing device in the embodiment of

[0027] Reference Signs: 1 - gas storage tank, 2 - air spring, 21 - base, 22 - bladder skin, 23 - piston, 3 - air supplementing and pressurizing device, 31 - cylinder body, 32 - sliding piston, 33 - piston rod, 34 - axial limiting part, 35 - air supplementing 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 electromagnetic valve, 92 - second electromagnetic valve. DETAILED DESCRIPTION

[0028] The utility model is further explained below by combining with the drawings and embodiments. The embodiments described below by referring to the drawings are exemplary and are only used for explaining the utility model and cannot be understood as the limitation of the utility model.

[0029] As shown in the accompanying Figures 1-4As shown, an air suspension air path system includes a gas tank 1 and a plurality of air springs 2, the gas inlet and outlet of the gas tank 1 are respectively connected with the air inlet of the air springs 2; further comprising a gas supplementing and pressurizing device 3, a dryer 4 and an exhaust valve 5; the gas supplementing and pressurizing device 3 includes a cylinder body 31 with one end opening, the cylinder body 31 is provided with a sliding piston 32 which is in axial sliding fit with the inner side wall of the cylinder body 31, the sliding piston 32 is in sealing fit with the inner side wall of the cylinder body 31 and forms a pressurized gas chamber 6 with the inner wall of the cylinder body 31; the sealing end of the cylinder body 31 is provided with a gas supplementing port 35 and a pressurized gas outlet port 36 which are connected with the pressurized gas chamber 6; the dryer 4 has a drying cavity and a first gas port 41 and a second gas port 42 which are connected with the drying cavity; the pressurized gas chamber 6 is connected with the external environment through the gas supplementing port 35, the pressurized gas chamber 6 is connected with the first gas port 41 of the dryer 4 through the pressurized gas outlet port 36; the gas inlet of the gas tank 1 is connected with the second gas port 42 of the dryer 4; the gas inlet of the exhaust valve 5 is connected with the air inlet of the air spring 2 and the pressurized gas outlet port 36; the gas supplementing port 35 is provided with a first one-way valve 81 which controls the flow of gas from the external atmosphere to the pressurized gas chamber 6, the pressurized gas outlet port 36 is provided with a second one-way valve 82 which controls the flow of gas from the pressurized gas chamber 6 to the drying cavity of the dryer 4; the gas inlet of the gas tank 1 is provided with a third one-way valve 83 which controls the flow of gas from the air inlet of the air spring 2 and the dryer 4 to the gas tank 1, the gas outlet of the gas tank 1 is provided with a first electromagnetic valve 91; the air inlet of the air spring 2 is provided with a second electromagnetic valve 92.

[0030] The axis of the cylinder body 31 of the gas supplementing and pressurizing device 3 should be arranged in the up-down direction. The cylinder body 31 can be installed on the wheel frame and the piston rod 33 is connected to the vehicle suspension. Preferably, the cylinder body 31 is connected to the vehicle suspension and the piston rod 33 is connected to the wheel frame. The position of the gas pipe leading out of the pressurized gas outlet port 36 is improved to facilitate the fixation of the gas pipe on the air suspension.

[0031] The air tank 1 is mainly used to store high pressure gas outputted by the air spring 2 and the air supplementing and pressurizing 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 volume of the air spring 2. The air supplementing and pressurizing device 3 uses the up and down vibration of the vehicle body to provide high pressure gas for the air tank 1 and to provide power for the air tank 1 to charge the air spring 2. The first one-way valve 81 is used to make the gas in the external atmosphere environment enter the pressurizing chamber 6 through the air supplementing port 35, and to avoid the gas in the pressurizing chamber 6 being outputted through the air supplementing port 35. The drying chamber of the dryer 4 is provided with a drying agent, which is mainly used to absorb the moisture of the high pressure gas generated by the air supplementing and pressurizing device 3, to dry the high pressure gas generated by the air supplementing and pressurizing device 3, and to avoid the moisture entering the air path system to affect the damping performance of the air spring 2. The exhaust valve 5 is mainly used to exhaust the excess gas in the air path system, that is, when the air volume of the air tank 1 is insufficient, the exhaust valve 5 closes the gas outlet of itself; when the air volume of the air tank 1 reaches the upper limit, the exhaust valve 5 opens the gas outlet of itself, and the high pressure gas outputted by the air supplementing and pressurizing device 3 and the air spring 2 is exhausted out of the suspension air path system through the gas outlet of the exhaust valve 5, so as to ensure the normal work of the suspension system. The second one-way valve 82 is used to make the gas in the pressurizing chamber 6 be outputted through the pressurizing gas outlet 36, and to avoid the gas in the external air path of the pressurizing chamber 6 being inputted into the pressurizing chamber 36 through the pressurizing gas outlet 36. The third one-way valve 83 is used to ensure that the gas can be charged into the air tank 1 through the air inlet of the air tank 1, and to avoid the gas in the air tank 1 being outputted through the air inlet. The first electromagnetic valve 91 is used to control the opening and closing of the gas outlet of the air tank 1, and the second electromagnetic valve 92 is used to control the opening and closing of the air charging port of the air spring 2, and the first electromagnetic valve 91 and the second electromagnetic valve 92 cooperate with each other to realize the charging and exhausting of the air spring 2.

[0032] When the vehicle runs on uneven road, the body drives the suspension to vibrate up and down, so the suspension and the wheel shaft move relatively in the up and down direction, and the air spring 2 extends and contracts, and the sliding piston 32 of the air supplementing and pressurizing device 3 reciprocates axially in the cylinder 31. When the suspension moves upward relative to the wheel frame, the two move away from each other, so the sliding piston 32 moves in the cylinder 31 away from the air supplementing port 35, and the volume of the pressurized air chamber 6 increases, and the air pressure decreases. In this process, the gas in the air path system cannot enter the pressurized 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 supplementing port 35. When the suspension moves downward relative to the wheel shaft, the two move close to each other, so the sliding piston 32 moves in the cylinder 31 close to the air supplementing port 35, and the volume of the pressurized air chamber 6 is compressed, and the air pressure in the pressurized air chamber 6 gradually increases. In this process, the gas in the pressurized air chamber 6 cannot be output from the air supplementing port 35, and with the compression movement of the sliding piston 32, the gas in the pressurized air chamber 6 is gradually pressurized, and the high-pressure gas in the pressurized air chamber 6 is output from the pressurized air outlet 36, enters the drying cavity of the dryer 4 through the first air port 41, and is dried in the drying cavity of the dryer 4. The high-pressure gas dried by the dryer 4 is output from the drying cavity of the dryer 4 through the second air port 42, and enters the gas storage tank 1 through the air inlet of the gas storage tank 1.

[0033] When the air spring 2 is inflated, the first electromagnetic valve 91 opens the air outlet of the gas storage tank 1, and the second electromagnetic valve 92 opens the inflation port of the air spring 2. When the air pressure in the gas storage tank 1 is sufficient, the high-pressure gas in the gas storage tank 1 is output from the air outlet and input into the working cavity of the air spring 2 through the inflation port of the air spring 2, and the high-pressure gas generated by the air supplementing and pressurizing device 3 is continuously charged into the gas storage tank 1. When the air pressure in the gas storage tank 1 is insufficient, the high-pressure gas generated by the air supplementing and pressurizing device 3 is dried by the dryer and charged into the gas storage tank 1, so as to ensure the air pressure in the gas storage tank 1 and provide power for the gas storage tank 1 to inflate the air spring 2. When the air spring 2 is deflated, the first electromagnetic valve 91 closes the air outlet of the gas storage tank 1, and the second electromagnetic valve 92 opens the inflation port of the air spring 2. If the air amount in the gas storage tank 1 is insufficient, the high-pressure gas output by the air spring 2 returns to the gas storage tank 1 through the air inlet of the gas storage tank 1. If the air amount in the gas storage tank 1 is sufficient, the high-pressure gas output from the pressurized air outlet 36 of the air supplementing and pressurizing device 3 and the gas output by the air spring 2 are all discharged by the exhaust valve 5. The exhaust valve 5 can be one or more.

[0034] The utility model discloses a kind of air suspension gas path systems, including air spring 2, air tank 1, pressure boosting device 3 and air spring gas path system 4, air tank 1 is connected with air spring 2 by pressure boosting device 3, and air spring gas path system 4 is connected with air tank 1 by pressure boosting device 3.

[0035] Preferably, it further includes a pressure sensor 71 for monitoring the air tank 1, the air spring 2 and the air pressure between them, and the pressure sensor 71 is electrically connected with the vehicle controller. The pressure sensor 71 transmits the monitored air pressure signal to the vehicle controller in real time, and the vehicle controller controls the opening and closing of the air outlet of the air tank 1 and the inflation port of the air spring 2 according to the received air pressure value signal to control the inflation and exhaust of the air spring 2. As a further preferred, a temperature sensor and a flow sensor can be integrated on the pressure sensor to detect the temperature and flow of the system, and an acceleration, gyroscope, height change sensor, etc. can also be added to the system. A humidity sensor and a temperature sensor can also be installed in the air path to monitor the temperature of the air path in real time.

[0036] As shown in Figure 3 Preferably, a pressure limiting safety valve 72 is provided in the communication path between the pressurized air outlet 36 and the first air port 41 of the dryer 4. When the pressure sensor 71 monitors that the gas pressure in the air tank 1 reaches the preset value, it sends a signal to the vehicle controller, and 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 pressure boosting device 3 is discharged through the pressure limiting safety valve 72, so that the air pressure in the entire air path system is maintained within a safe range, improving the safety and stability of the air suspension gas path system.

[0037] The first electromagnetic valve 91 and the second electromagnetic valve 92 are both two-position two-way electromagnetic valves, which save cost and are easy to control and install based on meeting the system requirements. If the system pressure requirement is high, the first electromagnetic valve 91 and the second electromagnetic valve 92 can also be selected as electromagnetic valves with pilot function.

[0038] The sliding piston 32 of the air supplementing and pressurizing device 3 can extend out of the cylinder body 31 or be completely located in the cylinder body 31, and can be a cylindrical structure or a stepped shaft structure. To avoid the sliding piston 32 from the cylinder body 31 opening end due to the excessive vibration amplitude of the vehicle body to cause the air supplementing and pressurizing device 3 to fail, preferably, the sliding piston 32 is connected with a piston rod 33, 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 arranged on the inner side wall of the opening end of the cylinder body 31. The sliding piston 32 is connected with the suspension or the wheel shaft through the piston rod 33.

[0039] To avoid the dust in the atmospheric environment from entering the pressurizing air chamber 6 through the air supplementing port 35, preferably, a filter screen is arranged on the air supplementing port 35, and the filter screen can be attached to the cylinder body 31 or be mounted on the cylinder body 31 through screws or other structures. The filter screen can be knitted cloth or air-permeable dustproof cotton. The air supplementing and pressurizing device 3 can be provided with one group or multiple groups. Preferably, the air supplementing and pressurizing device 3 is provided with multiple groups to ensure the sufficient gas amount of the gas storage tank 1 and improve the reliability of the suspension system.

[0040] The air supplementing and pressurizing device 3 needs to occupy a certain installation space when being separately installed on the vehicle suspension. Considering the limited installation space of the suspension, the installation position of the air supplementing and pressurizing device 3 can be adjusted to fully utilize the space of the vehicle suspension. The air spring 2 generally includes a base 21, a bag skin 22 and a piston 23, the base 21 is connected to the wheel shaft and seals the lower port of the bag skin 22, the piston 23 is connected to the vehicle suspension and seals the upper port of the bag skin 22, and the base 21, the bag skin 22 and the piston 23 surround the air chamber of the air spring 2. Among them, the axial slope change of the outer peripheral surface of the piston 23 has an important influence on the stiffness adjustment of the air spring, and therefore the piston 23 is generally a column 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 side wall of the sliding piston 32, the sliding piston 32 divides the air chamber of the air spring 2 into upper and lower air chambers isolated from each other, the upper air chamber is located on the upper side of the sliding piston 32, the upper air chamber is the pressurizing air chamber 6, and the lower end of the sliding piston 32 is connected to the base 21. The piston 23 on the air spring 2 is used to replace the cylinder body 21 to integrate the air supplementing and pressurizing device 3 in the air spring 2, save the suspension installation space, and facilitate the arrangement and installation of other elements on the suspension.

[0041] When the air supplement pressurizing device 3 delivers high-pressure gas to the gas storage tank 1, the high-pressure gas generated by the air supplement pressurizing device 3 enters the drying cavity through the first gas port 41 and is output to the gas storage tank 1 through the second gas port 42 after absorbing moisture by the drying agent, under the action of the gas flow, the moisture absorbed by the drying agent in the drying cavity is mainly concentrated in the drying cavity close to the second gas port 42. Figure 2 As shown in the figure, preferably, the air charging port of the air spring 2 is connected with the second gas port 42 on the dryer 4; the dryer 4 is further provided with a third gas port 43 connected with the drying cavity, and the exhaust valve 5 is arranged on the third gas port 43 and used for controlling the opening and closing of the third gas port 43. When the gas pressure in the gas storage tank 1 reaches the upper limit, the vehicle controller controls the exhaust valve 5 to open the third gas port 43, the gas discharged from the air spring 2 enters the drying cavity of the dryer 4 through the second gas port 42 and is then discharged through the third gas port 43, the water molecules concentrated in the drying cavity at the second gas port 42 are blown out through the third gas port 43, the drying agent is dried and regenerated, the drying efficiency of the dryer 4 is improved, and the service life of the dryer 4 is prolonged.

[0042] In the utility model, "upper", "lower", "top", "bottom", "inner", "outer" are relative position relations, and cannot be understood as the limitation of specific direction. The embodiments of the specific embodiment are the preferred embodiments of the utility model, and are not limited to the protection scope of the utility model, so that: equivalent changes made according to the structure, shape, principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. An air suspension air path system, comprising a gas tank (1) and a plurality of air springs (2), the gas inlet and outlet of the gas tank (1) being respectively connected with the air inlet of the air springs (2); characterized in that, it further comprises a gas supplementing and pressurizing device (3), a dryer (4) and an exhaust valve (5); the gas supplementing and pressurizing device (3) comprises a cylinder (31) with one end open, a sliding piston (32) being arranged in the cylinder (31) and axially slidingly fitted with the inner side wall of the cylinder (31), the sliding piston (32) being sealingly fitted with the inner side wall of the cylinder (31) and forming a pressurized gas chamber (6) with the inner wall of the cylinder (31); the sealed end of the cylinder (31) is provided with a gas supplementing port (35) and a pressurized gas outlet port (36) which are connected with the pressurized gas chamber (6); the dryer (4) has a drying cavity and a first gas port (41) and a second gas port (42) which are connected with the drying cavity; the pressurized gas chamber (6) is connected with the external environment through the gas supplementing port (35), and the pressurized gas chamber (6) is connected with the first gas port (41) of the dryer (4) through the pressurized gas outlet port (36); the gas inlet of the gas tank (1) is connected with the second gas port (42) of the dryer (4); the gas inlet of the exhaust valve (5) is connected with the air inlet of the air spring (2) and the pressurized gas outlet port (36); a first one-way valve (81) is arranged at the gas supplementing port (35) to control the flow of gas from the external atmosphere to the pressurized gas chamber (6), and a second one-way valve (82) is arranged at the pressurized gas outlet port (36) to control the flow of gas from the pressurized gas chamber (6) to the drying cavity of the dryer (4); a third one-way valve (83) is arranged at the gas inlet of the gas tank (1) to control the flow of gas from the air inlet of the air spring (2) and the dryer (4) to the gas tank (1), and a first electromagnetic valve (91) is arranged at the gas outlet of the gas tank (1); a second electromagnetic valve (92) is arranged at the air inlet of the air spring (2).

2. The air suspension air path system of claim 1, wherein: The cylinder (31) is connected to the vehicle suspension, and the sliding piston (32) is connected to the wheel frame.

3. The air suspension air path system of claim 1, wherein: It further comprises a pressure sensor (71) for monitoring the gas tank (1), the air spring (2) and the air pressure of the air path therebetween, and the pressure sensor (71) is electrically connected with the vehicle controller.

4. The air suspension air path system of claim 3, wherein: A pressure limiting safety valve (72) is arranged in the communication path between the pressurized gas outlet port (36) and the first gas port (41).

5. The air suspension air path system of claim 1, wherein: The first electromagnetic valve (91) and the second electromagnetic valve (92) are both two-position communication electromagnetic valves.

6. The air suspension air path system of claim 1, wherein: A piston rod (33) is connected to the sliding piston (32), 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); an axial limiting portion (34) is arranged on the inner side wall of the open end of the cylinder (31).

7. The air suspension air path system of claim 1, wherein: A filter screen is arranged at the gas supplementing port (35).

8. The air suspension air path system of claim 1, wherein: The gas supplementing and pressurizing device (3) is provided with at least two groups.

9. The air suspension air path system of claim 1, wherein: The air spring (2) comprises a base (21), a bag skin (22) and a piston (23) having a column cavity coaxial with the piston (23) and opening downward; the base (21) seals the lower end port of the bag skin (22), the piston (23) seals the upper end port of the bag skin (22), and the base (21), the bag skin (22) and the piston (23) surround the air chamber of the air spring (2); The piston (23) is the cylinder body (31), and the lower end of the piston (23) is the open 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 side wall of the sliding piston (32), the sliding piston (32) separates the air chamber of the air spring (2) into upper and lower air chambers 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).

10. The air suspension air path system of any one of claims 1-9, wherein: The inflation port of the air spring (2) is connected in communication with the second air port (42) on the dryer (4); The dryer (4) is further provided with a third air port (43) in communication with the drying cavity, and the exhaust valve (5) is arranged on the third air port (43).

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