Air suspension air path system

Abstract

The utility model relates to the field of air suspension, concretely relates to an air suspension gas path system, contains air compression unit, air spring unit, low pressure control unit, high pressure control unit and the gas storage unit that constitutes by double -cavity gas holder, double -cavity gas holder contains low pressure chamber and high pressure chamber, realizes high low pressure gas zoning storage, and when high pressure chamber fails, low pressure chamber can work as spare chamber and continue to work, and through specific venting pipeline connection and control valve cooperation between each unit, can realize multiple gas path control, and the air suspension gas path system pressure is accurately regulated, the utility model discloses through the redundancy design of double -cavity gas holder and promotes the reliability of whole system, utilizes closed -loop gas circulation and further reduces energy consumption, and with the pressure monitoring of multi -valve combination realizes accurate control, forms whole chain safety mechanism, solves traditional system gas storage single, pressure control inflexible, low reliability etc.

Description

Technical Field

[0001] This utility model relates to the field of air suspension technology, specifically to an air suspension air circuit system. Background Technology

[0002] With socio-economic development and improved living standards, people's demand for high-quality travel experiences and vehicle comfort features is growing. Air suspension systems, with their excellent comfort, adjustability, and stability, are increasingly widely used in commercial vehicles and high-end passenger cars. This system mainly consists of an air compressor, air tank, and air springs. By precisely controlling the airflow, it adjusts the vehicle height and has become one of the core technologies for enhancing vehicle performance and driving experience.

[0003] However, traditional air suspension systems have significant technical shortcomings. These systems rely solely on a single air tank; if the tank fails, the entire system must be inflated by drawing air from the atmosphere using an air compressor, a process that is typically time-consuming and inefficient. Furthermore, this single inflation path and inefficient gas utilization lead to frequent compressor starts, significantly increasing energy consumption and severely shortening the equipment's lifespan. Additionally, traditional pressure control components struggle to adapt to the dynamic pressure adjustment needs under complex operating conditions, resulting in a significant decrease in ride comfort. Moreover, when the air springs exhaust, if the air tank pressure is higher than the air spring pressure, the gas cannot be directly discharged into the tank; it must be compressed and stored in the tank by the air compressor or directly released into the atmosphere. This further exacerbates the energy consumption of the entire air suspension system and the wear and tear on related equipment.

[0004] To address the aforementioned problems, those skilled in the art have made various improvements to the air suspension air circuit system, attempting to utilize two air tanks within the system to solve these issues. Examples include publications such as CN118700773A ("A Dual-Tank Closed-Loop Air Supply System for Air Suspension and its Control Method"), CN118752964A ("An Air Suspension Control System and its Control Method"), and CN119872157A ("Air Suspension Air Circuit System and its Control Method, Vehicle, Device, and Storage Medium"). However, after prolonged use of these improved air suspension air circuit systems, technicians have discovered that while using two air tanks can overcome the technical shortcomings of traditional air suspension air circuit systems, it also introduces numerous new technical problems, such as:

[0005] (1) The independent dual-tank design requires two tanks to be arranged separately and additional pipelines to be connected, which will occupy more space and increase the difficulty of vehicle layout. In other words, the independent dual-tank design requires the separate installation of low-pressure tank and high-pressure tank, each occupying independent space. In scenarios with limited space such as vehicle chassis, not only is the overall volume large, but the arrangement of tanks and connecting pipelines is also complex, making it difficult to adapt to compact installation environments.

[0006] Most importantly, independent dual tanks require extensive piping and control valve connections (e.g., CN118700773A requires solenoid valves SV3-SV6 to control the intake and exhaust of the low-pressure tank and the high-pressure tank respectively, and CN118752964A requires the first to fifth switching valves to coordinate the interaction between the high and low-pressure tanks). This not only increases component costs but also increases the probability of failure due to the "multi-node connection" (e.g., valve jamming, pipeline leakage) and even increases maintenance difficulty.

[0007] In other words, independent dual tanks need to be connected by a large number of pipelines and valves (such as the high-pressure tank RES_H and low-pressure tank RES_L in CN118752964A, which need to go through multiple nodes such as compressors and switching valves). The more interfaces there are, the higher the risk of leakage, and the pressure fluctuations may be caused by residual gas in the pipelines, affecting the stability of the system.

[0008] (2) The standby switching of independent dual tanks requires long pipelines and multiple control valves (such as CN119872157A, after the high pressure tank fails, the compressor needs to be started to pressurize the gas in the low pressure tank, and then the gas is filled through the check valve and the distribution valve). The path is long and depends on the coordination of more components. It is easy to fail the switching due to the failure of the intermediate link, which reduces the reliability.

[0009] (3) Independent dual tanks have long pipelines and many valves, resulting in a lag in pressure transmission. They also require step-by-step control through multiple valves (for example, in CN119872157A, the pressure difference between the high-pressure tank and the air spring must be determined before switching to the low-pressure tank for air replenishment). The control logic is more complex and prone to adjustment delay or overshoot.

[0010] (4) The gas flow of independent dual tanks needs to go through a longer pipeline (such as the gas supply from the low-pressure tank LAT to the high-pressure tank HAT in CN118700773A needs to go through a compressor and solenoid valves SV3-SV6). The pipeline resistance and pressure loss are large, and the compressor needs to consume more energy to overcome the resistance, resulting in increased energy consumption.

[0011] How to address the shortcomings of traditional air suspension systems while avoiding these new technical problems has always been a pressing issue for those skilled in the art. Summary of the Invention

[0012] The purpose of this invention is to address the shortcomings of existing technologies by providing an air suspension system. This system comprises an air compression unit, an air spring unit, a low-pressure control unit, a high-pressure control unit, and a dual-chamber air tank. The dual-chamber air tank has separate low-pressure and high-pressure chambers, allowing for partitioned storage of high and low-pressure gases. Furthermore, when the high-pressure chamber fails, the low-pressure chamber can serve as a backup. Each unit is connected via specific ventilation lines and coordinated with control valves, enabling various air path controls such as air tank charging / discharging, air spring charging / discharging, gas flow between the high and low pressure chambers of the dual-chamber air tank, redundancy control, and overpressure venting, thus precisely regulating system pressure. This invention enhances the reliability of the entire system through the redundant design of the dual-chamber air tank, further reduces energy consumption through closed-loop gas circulation, and achieves precise control through multi-valve combinations and pressure monitoring, forming a complete safety mechanism. It solves the problems of single air storage, inflexible pressure control, and low reliability in traditional systems, thereby enhancing the stability, adaptability, and efficiency of the air suspension system.

[0013] The objective of this utility model is achieved through the following solution:

[0014] An air suspension air circuit system includes an air compression unit, an air spring unit, an air storage unit, a low-pressure control unit, and a high-pressure control unit. The air compression unit includes an intake pipe and an outlet pipe; the air spring unit includes two air supply pipes; the air storage unit includes two air supply pipes; the low-pressure control unit includes three air supply pipes; and the high-pressure control unit includes three air supply pipes.

[0015] The gas storage unit includes a dual-chamber gas storage tank, with two chambers: a low-pressure chamber and a high-pressure chamber. The vent pipe of the high-pressure chamber serves as the first vent pipe of the gas storage unit and is connected to the third vent pipe of the high-pressure control unit. The vent pipe of the low-pressure chamber serves as the second vent pipe of the gas storage unit and is connected to the third vent pipe of the low-pressure control unit. The inlet pipe of the air compression unit is connected to the first vent pipe of the low-pressure control unit, and the outlet pipe of the air compression unit is connected to the first vent pipe of the high-pressure control unit. The first vent pipe of the air spring unit is connected to the second vent pipe of the low-pressure control unit, and the second vent pipe of the air spring unit is connected to the second vent pipe of the high-pressure control unit. This allows the low-pressure chamber to continue supplying high-pressure gas to the system in the event of gas leakage from the high-pressure chamber, in conjunction with the air compression unit.

[0016] Preferably, the air spring unit includes a first air spring control valve, a second air spring control valve, a third air spring control valve, a fourth air spring control valve, a first air spring, a second air spring, a third air spring, and a fourth air spring. The first air spring control valve, the second air spring control valve, the third air spring control valve, and the fourth air spring control valve are all disposed between the first air supply line and the second air supply line of the air spring unit. The first air spring, the second air spring, the third air spring, and the fourth air spring of the air spring unit are respectively connected to the second air supply line of the low-pressure control unit and the second air supply line of the high-pressure control unit through the first air spring control valve, the second air spring control valve, the third air spring control valve, and the fourth air spring control valve.

[0017] Preferably, the air compression unit is provided with an air compressor, which includes an air inlet and a first air outlet. The air compressor is disposed between the air inlet pipe and the air outlet pipe of the air compression unit. The air inlet of the air compressor is connected to the air inlet pipe of the air compression unit, and the first air outlet of the air compressor is connected to the air outlet pipe of the air compression unit.

[0018] Preferably, the air compression unit is further provided with an external connection pipeline, and the air compressor is further provided with a second air outlet. The second air outlet of the air compressor is connected to the external connection pipeline of the air compression unit. The external connection pipeline is further provided with a second control valve and an air filter. The second air inlet of the air compressor is connected to one end of the air filter through the second control valve, and the other end of the air filter is connected to the outside.

[0019] Preferably, the air compression unit is further provided with a pressure relief air path control unit, which includes a pressure limiting safety valve. The pressure limiting safety valve includes an inlet end and an outlet end. The inlet end of the pressure limiting safety valve is connected to the outlet pipeline of the air compression unit, and the outlet end of the pressure limiting safety valve is connected to the external connection pipeline of the air compression unit. The outlet end of the pressure limiting safety valve is connected to the outside through an air filter.

[0020] Preferably, the high-pressure control unit is provided with an eighth control valve and a ninth control valve, and the low-pressure control unit is provided with an eleventh control valve and a twelfth control valve; each of the eighth, ninth, eleventh, and twelfth control valves includes three vent ports.

[0021] The first vent of the eighth control valve is connected to the first vent of the high-pressure control unit; the second vent of the eighth control valve is connected to the second vent of the ninth control valve; and the third vent of the eighth control valve is connected to the second vent of the high-pressure control unit. The first vent of the ninth control valve is connected to the first vent of the high-pressure control unit; and the third vent of the ninth control valve is connected to the third vent of the high-pressure control unit.

[0022] The first vent of the eleventh control valve is connected to the second vent of the low-pressure control unit; the second vent of the eleventh control valve is connected to the second vent of the twelfth control valve; and the third vent of the eleventh control valve is connected to the third vent of the low-pressure control unit. The first vent of the twelfth control valve is connected to the first vent of the low-pressure control unit; and the third vent of the twelfth control valve is connected to the second vent of the low-pressure control unit.

[0023] Preferably, a gas drying unit is provided between the high-pressure control unit and the air compression unit. The gas drying unit includes a dryer and three ventilation pipes. The dryer is disposed between the first, second, and third ventilation pipes of the gas drying unit. A one-way valve is also provided on the third ventilation pipe of the gas drying unit. The one-way valve has a throttling orifice at both ends. One end of the throttling orifice and the one-way valve are connected to the first ventilation pipe of the high-pressure control unit through the third ventilation pipe of the gas drying unit. The other end of the throttling orifice and the one-way valve are connected to one end of the dryer. The other end of the dryer is connected to the outlet pipe of the air compression unit through the second ventilation pipe of the gas drying unit, and the other end of the dryer is connected to the exhaust pipe of the pressure relief control unit through the first ventilation pipe of the gas drying unit.

[0024] Preferably, a pressure monitoring unit is further provided between the high-pressure control unit and the air spring unit. The pressure monitoring unit includes a pressure sensor, and the pressure detection end of the pressure sensor is connected to the second vent pipe of the high-pressure control unit and the second vent pipe of the air spring unit, respectively.

[0025] This utility model also discloses a control method for the above-mentioned air suspension air circuit system, including a method for controlling the inflation and deflation of the air storage unit, a method for controlling the inflation and deflation of the air spring unit, a method for controlling the gas flow between the high and low pressure chambers of the dual-chamber air storage tank, a method for controlling the redundancy of the dual-chamber air storage tank, and a method for controlling the overpressure exhaust of the air suspension air circuit system. The specific control methods are as follows:

[0026] 1) Gas storage unit charging and discharging control method

[0027] 1-1) Gas filling control method for dual-chamber gas storage tank

[0028] Open the air compressor, the second control valve, the check valve and the ninth control valve, and ensure that all the remaining control valves in the system are closed. Then start the air compressor to draw air from the outside and replenish the high-pressure chamber in the dual-chamber air tank until the high-pressure gas volume required for the normal lifting and lowering of the air suspension is met.

[0029] 1-2) Gas release control method for dual-chamber gas storage tanks

[0030] 1-2-1) When the high-pressure chamber in the dual-chamber gas storage tank exceeds the set pressure threshold, the second control valve, the eighth control valve, the ninth control valve and the twelfth control valve can be opened, and all remaining control valves in the system should be kept closed to perform overpressure venting.

[0031] 1-2-1) When the low-pressure chamber in the dual-chamber gas storage tank exceeds the set pressure threshold, the second control valve, the eleventh control valve and the twelfth control valve can be opened, and all remaining control valves in the system should be kept closed to perform overpressure venting.

[0032] 2) Air spring unit inflation / deflation control method

[0033] 2-1) Air spring unit inflation control method

[0034] 2-1-1) Control method for charging air spring units using the high-pressure chamber in the dual-chamber air tank: Open the eighth control valve, the ninth control valve, the first air spring control valve, the second air spring control valve, the third air spring control valve, and the fourth air spring control valve, and ensure that all remaining control valves in this system are closed. Due to the pressure difference, the gas in the high-pressure chamber of the dual-chamber air tank will quickly charge the first air spring, the second air spring, the third air spring, and the fourth air spring of the air spring unit.

[0035] 2-1-2) Control method for charging air spring units using an air compressor: Open the air compressor, second control valve, check valve, eighth control valve, first air spring control valve, second air spring control valve, third air spring control valve and fourth air spring control valve, and ensure that all remaining control valves in this system are closed, then start the air compressor to draw air from the outside to replenish the first air spring, second air spring, third air spring and fourth air spring of the air spring unit;

[0036] 2-2) Air spring deflation control method

[0037] 2-2-1) Control method for air spring to release air into the low-pressure chamber of the dual-chamber air tank: Open the first air spring control valve, the second air spring control valve, the third air spring control valve and the fourth air spring control valve, and ensure that all remaining control valves in this system are closed. Due to the pressure difference, the air spring unit will quickly release air into the low-pressure chamber of the dual-chamber air tank.

[0038] 2-2-2) Control method for releasing air from the air spring to the outside: Open the second control valve, the twelfth control valve, the first air spring control valve, the second air spring control valve, the third air spring control valve and the fourth air spring control valve, and ensure that all the remaining control valves in this system are closed. Due to the pressure difference, the air in the air spring unit will be directly released into the atmosphere.

[0039] 3) Gas flow control method between the high and low pressure chambers of a dual-chamber gas storage tank

[0040] When the pressure in the low-pressure chamber of the dual-chamber gas tank reaches the set threshold, while the gas pressure in the high-pressure chamber does not reach the set maximum threshold, open the air compressor, check valve, ninth control valve, eleventh control valve and twelfth control valve, and ensure that all remaining control valves in the system are closed. Then start the air compressor to draw air from the low-pressure chamber of the dual-chamber gas tank to replenish the high-pressure chamber of the dual-chamber gas tank.

[0041] 4) Redundancy control method for dual-chamber gas storage tanks

[0042] When the venting line of the high-pressure chamber in the dual-chamber air tank fails or the high-pressure chamber cannot work properly, open the compressor, check valve, second control valve, eighth control valve, eleventh control valve, first air spring control valve, second air spring control valve, third air spring control valve and fourth air spring control valve, and ensure that all remaining control valves in the system are closed. Then start the air compressor to draw air from the outside and replenish the low-pressure chamber in the dual-chamber air tank to the rated pressure, thereby ensuring that the air storage unit can still work properly and replenish the air spring unit.

[0043] 5) Overpressure exhaust control method for air suspension air circuit system

[0044] When the pressure in the air suspension system exceeds the threshold of the pressure relief valve, the air compressor, the second control valve, and the pressure relief valve are opened, and all other control valves in the system are kept closed. The pressure relief valve then opens automatically, releasing the overpressure gas into the atmosphere.

[0045] Preferably, according to the dual-chamber air tank redundancy control method, when the venting pipeline of the high-pressure chamber in the dual-chamber air tank fails or the high-pressure chamber cannot work normally, the air spring unit inflation control method further includes a control method for using the low-pressure chamber in the dual-chamber air tank to inflate the air spring unit. The specific control method is as follows:

[0046] Open the eleventh control valve, the first air spring control valve, the second air spring control valve, the third air spring control valve, and the fourth air spring control valve, and ensure that all remaining control valves in the system are closed. Due to the pressure difference, the gas in the low-pressure chamber of the dual-chamber air tank will quickly fill the first air spring, the second air spring, the third air spring, and the fourth air spring of the air spring unit.

[0047] The beneficial effects of this utility model are as follows:

[0048] An air suspension air circuit system includes an air compression unit, an air spring unit, an air storage unit, a low-pressure control unit, and a high-pressure control unit. The air compression unit includes an intake pipe and an outlet pipe; the air spring unit includes two air supply pipes; the air storage unit includes two air supply pipes; the low-pressure control unit includes three air supply pipes; and the high-pressure control unit includes three air supply pipes.

[0049] The gas storage unit includes a dual-chamber gas storage tank, with two chambers: a low-pressure chamber and a high-pressure chamber. The vent pipe of the high-pressure chamber serves as the first vent pipe of the gas storage unit and is connected to the third vent pipe of the high-pressure control unit. The vent pipe of the low-pressure chamber serves as the second vent pipe of the gas storage unit and is connected to the third vent pipe of the low-pressure control unit. The inlet pipe of the air compression unit is connected to the first vent pipe of the low-pressure control unit, and the outlet pipe of the air compression unit is connected to the first vent pipe of the high-pressure control unit. The first vent pipe of the air spring unit is connected to the second vent pipe of the low-pressure control unit, and the second vent pipe of the air spring unit is connected to the second vent pipe of the high-pressure control unit. This allows the low-pressure chamber to continue supplying high-pressure gas to the system in the event of gas leakage from the high-pressure chamber, in conjunction with the air compression unit.

[0050] The dual-chamber gas tank of this invention forms a low-pressure chamber and a high-pressure chamber through internal partitions, sharing a single tank shell. The internal partitions prevent crosstalk between high and low-pressure gases, eliminating the need to reserve installation space for two separate gas tanks. Especially in situations where vehicle chassis space is limited, this integrated design significantly reduces the overall volume, perfectly suited for compact layouts, greatly saving space and simplifying the arrangement.

[0051] Moreover, the low-pressure chamber and high-pressure chamber of the dual-chamber gas storage tank of this utility model are separated by an internal structure. Only two external venting pipes are needed to connect the low-pressure control unit and the high-pressure control unit respectively. The design of the pipes and control valves is relatively simple (controlled by only a few valves such as the eleventh control valve and the twelfth control valve), which can effectively reduce the number of pipes and control valves and reduce the complexity of the system.

[0052] In this way, due to the integrated design of the dual-chamber gas tank, the number of external pipeline interfaces is reduced (only one vent pipe for each of the two chambers), so there are relatively fewer leakage points, which can minimize the risk of gas leakage in the system and improve the overall stability of the system.

[0053] Preferably, the air spring unit includes a first air spring control valve, a second air spring control valve, a third air spring control valve, a fourth air spring control valve, a first air spring, a second air spring, a third air spring, and a fourth air spring. The first air spring control valve, the second air spring control valve, the third air spring control valve, and the fourth air spring control valve are all disposed between the first air supply line and the second air supply line of the air spring unit. The first air spring, the second air spring, the third air spring, and the fourth air spring of the air spring unit are respectively connected to the second air supply line of the low-pressure control unit and the second air supply line of the high-pressure control unit through the first air spring control valve, the second air spring control valve, the third air spring control valve, and the fourth air spring control valve.

[0054] This invention achieves precise and independent control of the air springs by setting four independent air spring control valves to control the inflation and deflation of four air springs, and connecting each control valve to the ventilation pipeline of the high and low pressure control unit. This technical solution allows for flexible adjustment of the inflation and deflation of one or more air springs according to different operating conditions. It can utilize high-pressure gas for rapid lifting and lowering, and low-pressure gas for fine adjustment, significantly improving the response speed, adaptability, and stability of the entire air suspension system. Simultaneously, this redundant design ensures that if one control valve or air spring fails, other components can still operate normally, enhancing the system's reliability and fault tolerance, extending its overall service life, and reducing maintenance costs.

[0055] Preferably, the air compression unit is provided with an air compressor, which includes an air inlet and a first air outlet. The air compressor is disposed between the air inlet pipe and the air outlet pipe of the air compression unit. The air inlet of the air compressor is connected to the air inlet pipe of the air compression unit, and the first air outlet of the air compressor is connected to the air outlet pipe of the air compression unit.

[0056] Preferably, the air compression unit is further provided with an external connection pipeline, and the air compressor is further provided with a second air outlet. The second air outlet of the air compressor is connected to the external connection pipeline of the air compression unit. The external connection pipeline is further provided with a second control valve and an air filter. The second air inlet of the air compressor is connected to one end of the air filter through the second control valve, and the other end of the air filter is connected to the outside.

[0057] Preferably, the air compression unit is further provided with a pressure relief air path control unit, which includes a pressure limiting safety valve. The pressure limiting safety valve includes an inlet end and an outlet end. The inlet end of the pressure limiting safety valve is connected to the outlet pipeline of the air compression unit, and the outlet end of the pressure limiting safety valve is connected to the external connection pipeline of the air compression unit. The outlet end of the pressure limiting safety valve is connected to the outside through an air filter.

[0058] This invention features an air compressor and its multi-terminal connection structure, effectively connecting the intake pipe, exhaust pipe, and external connection pipe. An air filter ensures the purity of the incoming gas, reducing wear and tear on related components and the risk of failure, thereby improving equipment stability and lifespan. The second control valve allows for flexible control of gas flow, enhancing system operability. Simultaneously, the pressure relief valve in the pressure relief control unit promptly discharges excessively high internal pressure through the external connection pipe and air filter, preventing equipment damage or accidents due to abnormal pressure. This automatic pressure regulation and safety protection mechanism effectively improves the safety, reliability, and efficiency of the air compressor unit.

[0059] In other words, the multi-terminal connection design of the air compressor and the coordinated operation of the pressure relief air circuit control unit in this utility model not only realize the flexible control of gas flow direction and the precise guarantee of intake air quality, significantly improving the reliability of equipment operation, but also achieve a dynamic balance between pressure regulation and energy consumption management by reducing component wear and avoiding safety hazards through the automatic pressure relief mechanism of the pressure relief safety valve and the filtration protection of the air filter. It demonstrates outstanding technical advantages and application value in terms of functionality, safety and economy.

[0060] Preferably, the high-pressure control unit is provided with an eighth control valve and a ninth control valve, and the low-pressure control unit is provided with an eleventh control valve and a twelfth control valve; each of the eighth, ninth, eleventh, and twelfth control valves includes three vent ports.

[0061] The first vent of the eighth control valve is connected to the first vent of the high-pressure control unit; the second vent of the eighth control valve is connected to the second vent of the ninth control valve; and the third vent of the eighth control valve is connected to the second vent of the high-pressure control unit. The first vent of the ninth control valve is connected to the first vent of the high-pressure control unit; and the third vent of the ninth control valve is connected to the third vent of the high-pressure control unit.

[0062] The first vent of the eleventh control valve is connected to the second vent of the low-pressure control unit; the second vent of the eleventh control valve is connected to the second vent of the twelfth control valve; and the third vent of the eleventh control valve is connected to the third vent of the low-pressure control unit. The first vent of the twelfth control valve is connected to the first vent of the low-pressure control unit; and the third vent of the twelfth control valve is connected to the second vent of the low-pressure control unit.

[0063] This invention constructs a multi-path gas control network by setting an eighth and ninth control valve in the high-pressure control unit and an eleventh and twelfth control valve in the low-pressure control unit, with each valve employing a three-port structure: the eighth control valve connects to the first and second vent lines of the high-pressure unit and is connected to the second vent of the ninth control valve; the ninth control valve simultaneously connects to the first and third vent lines of the high-pressure unit, realizing the diversion and convergence control of high-pressure gas between the compression unit, the gas storage unit, and the air spring unit; the eleventh control valve connects to the second and third vent lines of the low-pressure unit and is connected to the second vent of the twelfth control valve; the twelfth control valve connects to the first and second vent lines of the low-pressure unit, forming a circulation and depressurization channel for low-pressure gas.

[0064] In other words, the valve group configuration and air circuit connection structure adopted in this utility model not only achieves precise distribution and pressure regulation of high-pressure / low-pressure gas through multi-valve collaborative control to meet the air spring unit's charging and discharging requirements and the air storage unit's pressure balance requirements, but also constructs a redundant control path through valve port linkage design. When the high-pressure chamber fails, backup air supply can be achieved by switching the valve of the low-pressure control unit, thereby improving the reliability of the entire air suspension air circuit system. At the same time, it provides a hardware foundation for complex control logic such as overpressure exhaust and gas flow in high and low pressure chambers, enabling the entire air circuit system to operate efficiently and stably under different working conditions.

[0065] Preferably, a gas drying unit is provided between the high-pressure control unit and the air compression unit. The gas drying unit includes a dryer and three ventilation pipes. The dryer is disposed between the first, second, and third ventilation pipes of the gas drying unit. A one-way valve is also provided on the third ventilation pipe of the gas drying unit. The one-way valve has a throttling orifice at both ends. One end of the throttling orifice and the one-way valve are connected to the first ventilation pipe of the high-pressure control unit through the third ventilation pipe of the gas drying unit. The other end of the throttling orifice and the one-way valve are connected to one end of the dryer. The other end of the dryer is connected to the outlet pipe of the air compression unit through the second ventilation pipe of the gas drying unit, and the other end of the dryer is connected to the exhaust pipe of the pressure relief control unit through the first ventilation pipe of the gas drying unit.

[0066] This invention incorporates a gas drying unit between the high-pressure control unit and the air compression unit. The dryer effectively filters moisture from the high-pressure gas, preventing moisture accumulation in the system that could lead to component corrosion or freezing, thus significantly extending the service life of the air suspension air circuit system and air springs. The combination of a one-way valve and a throttle orifice ensures that the gas flows in only one direction and allows for control of the airflow speed, preventing backflow of high-pressure gas from damaging the dryer. Simultaneously, the throttling effect optimizes the gas pressure, ensuring stable operation of the entire system.

[0067] Furthermore, the interconnected design between the dryer and the pressure relief air circuit control unit allows the dryer to simultaneously discharge moisture when the air suspension air circuit system is depressurized, achieving a "self-regeneration function," improving drying efficiency and reducing maintenance costs. Through the integrated design of this technical solution, the purity of the high-pressure gas is ensured, and multiple safety mechanisms enhance system reliability, providing crucial support for the stable operation of the air suspension in complex environments.

[0068] Preferably, a pressure monitoring unit is further provided between the high-pressure control unit and the air spring unit. The pressure monitoring unit includes a pressure sensor, and the pressure detection end of the pressure sensor is connected to the second vent pipe of the high-pressure control unit and the second vent pipe of the air spring unit, respectively.

[0069] This invention establishes a real-time bidirectional pressure monitoring mechanism by setting a pressure monitoring unit between the high-pressure control unit and the air spring unit. The detection end of the pressure sensor is simultaneously connected to the second air supply line of both the high-pressure control unit and the air spring unit. On one hand, it can collect real-time gas pressure data output from the high-pressure control unit to the air spring unit, accurately reflecting the pressure changes of the air spring during inflation. This provides real-time data support for adjusting the opening of components such as the eighth and ninth control valves, achieving closed-loop control of the air spring inflation and deflation pressure and avoiding suspension performance instability caused by excessive pressure fluctuations. On the other hand, by monitoring the pressure difference between the two air supply lines, it can determine whether there are any abnormal conditions such as blockages or leaks in the air supply.

[0070] In other words, this invention, through the integrated structure of the dual-chamber air tank, enables the pressure sensor to monitor the chamber pressure more directly, reducing measurement errors caused by pipeline delays. Simultaneously, the shorter gas charging / discharging path results in faster pressure regulation response (e.g., air spring charging / discharging can be completed quickly based on pressure difference, without the need for complex valve coordination), more precise pressure control, and a faster overall system response. When an abnormality occurs in the pressure transmission between the high-pressure control unit and the air spring unit, the entire air suspension system can quickly trigger fault warnings or redundant control strategies (such as switching to low-pressure chamber air supply) based on pressure sensor data. Furthermore, this monitoring structure, in conjunction with the redundant design of the dual-chamber air tank, allows for real-time monitoring of the low-pressure chamber air supply pressure via pressure sensors when the high-pressure chamber fails, ensuring the continuous and stable operation of the suspension system. This effectively improves the safety, reliability, and dynamic response accuracy of the air system, meeting the high-precision pressure control requirements of the entire vehicle suspension system.

[0071] This utility model also discloses a control method for the above-mentioned air suspension air circuit system, including a method for controlling the inflation and deflation of the air storage unit, a method for controlling the inflation and deflation of the air spring unit, a method for controlling the gas flow between the high and low pressure chambers of the dual-chamber air storage tank, a method for controlling the redundancy of the dual-chamber air storage tank, and a method for controlling the overpressure exhaust of the air suspension air circuit system. The specific control method is as follows:

[0072] 1) Gas storage unit charging and discharging control method

[0073] 1-1) Gas filling control method for dual-chamber gas storage tank

[0074] Open the air compressor, the second control valve, the check valve and the ninth control valve, and ensure that all the remaining control valves in the system are closed. Then start the air compressor to draw air from the outside and replenish the high-pressure chamber in the dual-chamber air tank until the high-pressure gas volume required for the normal lifting and lowering of the air suspension is met.

[0075] 1-2) Gas release control method for dual-chamber gas storage tanks

[0076] 1-2-1) When the high-pressure chamber in the dual-chamber gas storage tank exceeds the set pressure threshold, the second control valve, the eighth control valve, the ninth control valve and the twelfth control valve can be opened, and all remaining control valves in the system should be kept closed to perform overpressure venting.

[0077] 1-2-1) When the low-pressure chamber in the dual-chamber gas storage tank exceeds the set pressure threshold, the second control valve, the eleventh control valve and the twelfth control valve can be opened, and all remaining control valves in the system should be kept closed to perform overpressure venting.

[0078] 2) Air spring unit inflation / deflation control method

[0079] 2-1) Air spring unit inflation control method

[0080] 2-1-1) Control method for charging air spring units using the high-pressure chamber in the dual-chamber air tank: Open the eighth control valve, the ninth control valve, the first air spring control valve, the second air spring control valve, the third air spring control valve, and the fourth air spring control valve, and ensure that all remaining control valves in this system are closed. Due to the pressure difference, the gas in the high-pressure chamber of the dual-chamber air tank will quickly charge the first air spring, the second air spring, the third air spring, and the fourth air spring of the air spring unit.

[0081] 2-1-2) Control method for charging air spring units using an air compressor: Open the air compressor, second control valve, check valve, eighth control valve, first air spring control valve, second air spring control valve, third air spring control valve and fourth air spring control valve, and ensure that all remaining control valves in this system are closed, then start the air compressor to draw air from the outside to replenish the first air spring, second air spring, third air spring and fourth air spring of the air spring unit;

[0082] 2-2) Air spring deflation control method

[0083] 2-2-1) Control method for air spring to release air into the low-pressure chamber of the dual-chamber air tank: Open the first air spring control valve, the second air spring control valve, the third air spring control valve and the fourth air spring control valve, and ensure that all remaining control valves in this system are closed. Due to the pressure difference, the air spring unit will quickly release air into the low-pressure chamber of the dual-chamber air tank.

[0084] 2-2-2) Control method for releasing air from the air spring to the outside: Open the second control valve, the twelfth control valve, the first air spring control valve, the second air spring control valve, the third air spring control valve and the fourth air spring control valve, and ensure that all the remaining control valves in this system are closed. Due to the pressure difference, the air in the air spring unit will be directly released into the atmosphere.

[0085] 3) Gas flow control method between the high and low pressure chambers of a dual-chamber gas storage tank

[0086] When the pressure in the low-pressure chamber of the dual-chamber gas tank reaches the set threshold, while the gas pressure in the high-pressure chamber does not reach the set maximum threshold, open the air compressor, check valve, ninth control valve, eleventh control valve and twelfth control valve, and ensure that all remaining control valves in the system are closed. Then start the air compressor to draw air from the low-pressure chamber of the dual-chamber gas tank to replenish the high-pressure chamber of the dual-chamber gas tank.

[0087] The high-pressure and low-pressure chambers of the dual-chamber gas storage tank described in this utility model are close to each other, and the gas flow path is short (for example, when the low-pressure chamber replenishes gas to the high-pressure chamber, it only needs to pass through an air compressor and a few control valves), which optimizes the gas flow efficiency, reduces gas flow resistance, lowers compressor load, and significantly reduces energy consumption.

[0088] 4) Redundancy control method for dual-chamber gas storage tanks

[0089] When the venting line of the high-pressure chamber in the dual-chamber air tank fails or the high-pressure chamber cannot work properly, open the compressor, check valve, second control valve, eighth control valve, eleventh control valve, first air spring control valve, second air spring control valve, third air spring control valve and fourth air spring control valve, and ensure that all remaining control valves in the system are closed. Then start the air compressor to draw air from the outside and replenish the low-pressure chamber in the dual-chamber air tank to the rated pressure, thereby ensuring that the air storage unit can still work properly and replenish the air spring unit.

[0090] In other words, when the high-pressure chamber fails, the low-pressure chamber can be directly used as a backup chamber for rapid switching (controlled by the valve of the low-pressure control unit). Since the two chambers are integrated into the same tank, the backup gas path is short and the resistance is low, resulting in a faster switching response, which greatly improves the redundancy switching efficiency and enhances the system reliability.

[0091] 5) Overpressure exhaust control method for air suspension air circuit system

[0092] When the pressure in the air suspension system exceeds the threshold of the pressure relief valve, the air compressor, the second control valve, and the pressure relief valve are opened, and all other control valves in the system are kept closed. The pressure relief valve then opens automatically, releasing the overpressure gas into the atmosphere.

[0093] The control method provided by this invention enables multi-dimensional air circuit control strategies, achieving efficient, safe, and reliable operation of the air suspension air circuit system. Specifically, the air storage unit charging / discharging control method precisely adjusts the pressure of the dual-chamber air storage tank to prevent overpressure damage; the air spring unit charging / discharging control method supports multiple air source selections and discharging modes, flexibly adapting to different operating conditions; the dual-chamber air storage tank high / low pressure chamber gas flow control method further optimizes gas resource allocation and improves utilization efficiency; the dual-chamber air storage tank redundancy control method activates the low-pressure chamber as a backup when the high-pressure chamber fails, ensuring continuous system operation; and the air suspension air circuit system overpressure exhaust control method uses a pressure-limiting safety valve to promptly release pressure and prevent system failure.

[0094] In summary, through the synergistic effect of multiple control methods in this technical solution, the problems of inflexible pressure regulation, poor reliability, low gas utilization rate, and frequent compressor starts in traditional air suspension systems are effectively solved. This significantly enhances the adaptability, stability, and fault response capabilities of the air suspension system, and extends the service life of the equipment.

[0095] Preferably, according to the dual-chamber air tank redundancy control method, when the venting pipeline of the high-pressure chamber in the dual-chamber air tank fails or the high-pressure chamber cannot work normally, the air spring unit inflation control method further includes a control method for using the low-pressure chamber in the dual-chamber air tank to inflate the air spring unit. The specific control method is as follows:

[0096] Open the eleventh control valve, the first air spring control valve, the second air spring control valve, the third air spring control valve, and the fourth air spring control valve, and ensure that all remaining control valves in the system are closed. Due to the pressure difference, the gas in the low-pressure chamber of the dual-chamber air tank will quickly fill the first air spring, the second air spring, the third air spring, and the fourth air spring of the air spring unit.

[0097] When the high-pressure chamber in the dual-chamber air tank fails, this technical solution utilizes the eleventh control valve to connect the low-pressure chamber and the air spring unit's ventilation pipeline, enabling direct inflation of the air spring from the low-pressure chamber. This control method eliminates the need to start the air compressor; it relies solely on pressure differential to quickly inflate the air spring from the low-pressure chamber. This maintains the basic operational status of the air suspension and ensures vehicle stability even in the event of high-pressure chamber failure, while also preventing system paralysis due to high-pressure chamber malfunction, significantly improving the redundancy and reliability of the air circuit system. Furthermore, this purely pressure differential-driven inflation method requires no additional energy consumption, further optimizing energy efficiency while ensuring system emergency response capabilities, providing a highly efficient and energy-saving solution for air suspension systems in the event of sudden failures.

[0098] The advantages of this utility model are as follows:

[0099] ① This utility model uses internal partitions within a dual-chamber air tank to create independent high-pressure and low-pressure chambers. When the high-pressure chamber fails due to pipeline leakage or abnormal pressure, the air suspension system can switch to low-pressure chamber air supply mode via the eleventh control valve 11. Through the pressure differential drive principle, the gas in the low-pressure chamber of the dual-chamber air tank quickly fills the air spring, preventing loss of vehicle height control. This redundant design allows the air storage unit to maintain basic functionality even when a single chamber fails, significantly reducing the failure rate of the air suspension system and solving the fatal flaw of traditional solutions where "single tank failure leads to paralysis."

[0100] ② This invention utilizes a dual-chamber air tank high-low pressure chamber flow control method. When the low-pressure chamber pressure reaches a threshold while the high-pressure chamber is not full, the air compressor is activated to draw gas from the low-pressure chamber and replenish the high-pressure chamber, forming a closed-loop gas circulation. Simultaneously, when the air spring releases air, it can be directly discharged into the low-pressure chamber via pressure difference without the need for the air compressor. This significantly reduces the starting frequency of the air compressor. Furthermore, the emergency inflation of the air spring by the low-pressure chamber relies entirely on pressure difference drive, requiring no energy consumption, making it more energy-efficient than traditional solutions and fundamentally solving the energy consumption problem of high-load compressor operation.

[0101] ③ This utility model, through a combination of multiple valves including the ninth and eleventh control valves, enables flexible switching between rapid inflation of the high-pressure chamber and precise adjustment of the low-pressure chamber. Under normal operating conditions, the high-pressure chamber is connected to the high-pressure control unit via the ninth control valve, allowing for rapid adjustment of the vehicle body from a low to a high position. When precise control of the vehicle height is required, the low-pressure chamber can be activated to supply air via the eleventh control valve, preventing overshoot caused by high-pressure gas. Simultaneously, the pressure monitoring unit can detect the air circuit pressure in real time, and combined with the on / off control of the eighth control valve, further improves the accuracy of pressure regulation, effectively solving the problems of lag and slow response in traditional systems.

[0102] ④ The pressure-limiting safety valve in the air compression unit automatically opens when the system pressure exceeds the threshold, safely venting through the air filter to prevent high-pressure damage to components. The dryer in the gas drying unit, along with a one-way valve and throttle orifice, filters moisture from high-pressure gas in real time, preventing pipeline corrosion and freezing in winter, thus extending the life of the air springs. Furthermore, the separate design of the dual-chamber air tank prevents the mixing of high and low-pressure gases, preventing abnormal pressure in the low-pressure chamber due to high-pressure leakage. Combined with the pressure relief air circuit control unit, the entire system forms a complete safety mechanism from pressure monitoring and over-limit protection to moisture filtration, overcoming the reliability bottleneck of traditional air suspension systems caused by overpressure or moisture.

[0103] ⑤ The air spring unit controls four air springs through four independent air spring control valves. Individual spring pressure can be adjusted (e.g., when the vehicle is unevenly loaded), or they can work together to achieve overall height adjustment. This modular design ensures that if a control valve or air spring fails, the remaining components can still operate normally. Maintenance only requires replacing the failed module, further reducing maintenance costs. Furthermore, the redundant control logic of this dual-chamber air tank can be upgraded via software to adapt to different vehicle models (e.g., passenger cars, commercial vehicles) without significant hardware modifications, offering significantly better compatibility than traditional fixed air storage solutions.

[0104] ⑥ This utility model utilizes an innovative closed-loop gas flow and redundancy switching mechanism. Through collaboration with modules such as multi-valve combination control and pressure monitoring unit, the multi-valve combination enables flexible allocation of high and low pressure gases. The pressure monitoring unit provides data support, allowing the low-pressure chamber to be quickly filled with gas based on the pressure difference when the high-pressure chamber fails, without additional energy consumption. This further optimizes the energy management and fault response capabilities of the air suspension air circuit system, effectively breaking through the contradiction between reliability and energy consumption in the existing technology, and improving the stability and energy utilization efficiency of the entire air suspension air circuit system.

[0105] In summary, the dual-chamber air tank design adopted in this utility model solves the problems of "complex structure, large space occupation, high energy consumption, and low reliability" in the independent dual-tank design through the advantages of "integration" and "short path". It is particularly outstanding in terms of redundancy, energy consumption control and compact layout, and is more suitable for the high efficiency, stability and reliability requirements of vehicle air suspension systems. Attached Figure Description

[0106] Figure 1 This is a schematic diagram of the air suspension air circuit system of this utility model;

[0107] Figure 2 This is a schematic diagram of the air circuit structure of the air suspension air circuit system of this utility model;

[0108] Figure 3 This is a schematic diagram of the gas path control for the gas storage unit in this embodiment of the present invention.

[0109] Figure 4 This is a schematic diagram of the gas path control for the gas storage unit to release gas in an embodiment of this utility model;

[0110] Figure 5 This is a schematic diagram of the air circuit control for the air spring unit inflation in this embodiment of the present invention;

[0111] Figure 6 This is a schematic diagram of the air path control for the air spring unit to release air in an embodiment of this utility model;

[0112] Figure 7 This is a schematic diagram of the gas path control for gas flow between the high and low pressure chambers of the dual-chamber gas storage tank in an embodiment of this utility model;

[0113] Figure 8 This is a schematic diagram of the redundant gas path control for the dual-chamber gas storage tank in an embodiment of this utility model;

[0114] Figure 9 This is a schematic diagram of the air circuit control for overpressure exhaust of the air suspension air circuit system in an embodiment of this utility model;

[0115] in, Figures 3 to 9The dark black bold air path indicates that the air path is connected. The red arrow on the dark black bold air path indicates the direction of gas flow. The red bold cross indicates that the current component is malfunctioning or the air path is blocked. Specific implementation methods

[0116] like Figure 1 As shown, an air suspension air circuit system includes an air compression unit, an air spring unit, an air storage unit, a low-pressure control unit, and a high-pressure control unit. The air compression unit includes an intake pipe and an outlet pipe; the air spring unit includes two air vents; the air storage unit includes two air vents; the low-pressure control unit includes three air vents; the high-pressure control unit includes three air vents; the air storage unit is composed of a dual-chamber air tank 10, comprising a low-pressure chamber and a high-pressure chamber. A partition is provided between the low-pressure chamber and the high-pressure chamber in the dual-chamber air tank 10. Each of the low-pressure chamber and the high-pressure chamber has an air vent. The air vent of the high-pressure chamber is connected to the first air vent of the air storage unit, and the air vent of the low-pressure chamber is connected to the air storage unit. The second ventilation line of the unit is connected. The high-pressure chamber is used to store high-pressure gas, and the low-pressure chamber is used to store low-pressure gas. When the high-pressure chamber fails, the backup gas storage chamber (low-pressure chamber) can be used to continue working. The air inlet line of the air compression unit is connected to the first ventilation line of the low-pressure control unit, the air outlet line of the air compression unit is connected to the first ventilation line of the high-pressure control unit, the first ventilation line of the air spring unit is connected to the second ventilation line of the low-pressure control unit, the second ventilation line of the air spring unit is connected to the second ventilation line of the high-pressure control unit, the first ventilation line of the gas storage unit is connected to the third ventilation line of the high-pressure control unit, and the second ventilation line of the gas storage unit is connected to the third ventilation line of the low-pressure control unit.

[0117] This utility model also includes a pressure monitoring unit, which includes a pressure sensor 21. The pressure detection end of the pressure sensor 21 is connected to the second vent pipe of the high-pressure control unit and the second vent pipe of the air spring unit.

[0118] To ensure stable air pressure throughout the air suspension system during operation, an external connection pipe can be installed on the air compression unit. This external connection pipe connects the air compression unit to the outside environment and includes a control valve. The air compression unit also has a pressure relief control unit, which includes a pressure-limiting safety valve. This valve has an inlet and an outlet. The inlet of the pressure-limiting safety valve is connected to the outlet pipe of the air compression unit, and the outlet is connected to the external connection pipe. The outlet of the pressure-limiting safety valve is only used to release air when the air pressure in the air suspension system is too high.

[0119] like Figure 2 As shown, using multiple two-position two-way solenoid valves, the following is an example based on the above content:

[0120] ① Air spring unit:

[0121] The air spring unit includes a first air spring control valve 13, a second air spring control valve 14, a third air spring control valve 15, a fourth air spring control valve 16, a first air spring 17, a second air spring 18, a third air spring 19, and a fourth air spring 20. Each of the first air spring control valves 13, 14, 15, and 16 includes three vents. Each of the first air springs 17, 18, 19, and 20 includes one vent. The first air springs 17 and 18 are located at the front of the vehicle and are collectively referred to as the front air springs. The third air springs 19 and 20 are located at the rear of the vehicle and are collectively referred to as the rear air springs.

[0122] The first air spring control valve 13, the second air spring control valve 14, the third air spring control valve 15, and the fourth air spring control valve 16 are all located between the first vent pipe and the second vent pipe of the air spring unit. That is, the first vent of the first air spring control valve 13 is connected to the first vent pipe of the air spring unit, the second vent of the first air spring control valve 13 is connected to the second vent pipe of the air spring unit, the first vent of the second air spring control valve 14 is connected to the first vent pipe of the air spring unit, the second vent of the second air spring control valve 14 is connected to the second vent pipe of the air spring unit, the first vent of the third air spring control valve 15 is connected to the first vent pipe of the air spring unit, the second vent of the third air spring control valve 15 is connected to the second vent pipe of the air spring unit, the first vent of the fourth air spring control valve 16 is connected to the first vent pipe of the air spring unit, and the second vent of the fourth air spring control valve 16 is connected to the second vent pipe of the air spring unit.

[0123] The first air spring 17, the second air spring 18, the third air spring 19, and the fourth air spring 20 are respectively connected to the first and second vent lines of the air spring unit via the first air spring control valve 13, the second air spring control valve 14, the third air spring control valve 15, and the fourth air spring control valve 16. That is, the third vent of the first air spring control valve 13 is connected to the vent of the first air spring 17, the third vent of the second air spring control valve 14 is connected to the vent of the second air spring 18, the third vent of the third air spring control valve 15 is connected to the vent of the third air spring 19, and the third vent of the fourth air spring control valve 16 is connected to the vent of the fourth air spring 20.

[0124] ②Gas storage unit:

[0125] The gas storage unit is a dual-chamber gas storage tank 10, which includes a low-pressure chamber and a high-pressure chamber. Each of the low-pressure chamber and the high-pressure chamber has a vent. The vent of the low-pressure chamber is connected to the second venting pipeline of the gas storage unit, and the vent of the high-pressure chamber is connected to the first venting pipeline of the gas storage unit.

[0126] ③High-voltage control unit:

[0127] An eighth control valve 8 and a ninth control valve 9 are provided between the first vent line, the second vent line and the third vent line of the high-pressure control unit. The eighth control valve 8 and the ninth control valve 9 each include three vent ports.

[0128] The first vent of the eighth control valve 8 is connected to the first vent of the high-pressure control unit; the second vent of the eighth control valve 8 is connected to the second vent of the ninth control valve 9; and the third vent of the eighth control valve 8 is connected to the second vent of the high-pressure control unit. The first vent of the ninth control valve 9 is connected to the first vent of the high-pressure control unit; and the third vent of the ninth control valve 9 is connected to the third vent of the high-pressure control unit.

[0129] ④Low-voltage control unit:

[0130] The low-pressure control unit is provided with an eleventh control valve 11 and a twelfth control valve 12 between the first vent line, the second vent line and the third vent line. The eleventh control valve 11 and the twelfth control valve 12 each include three vent ports.

[0131] The first vent of the eleventh control valve 11 is connected to the second vent of the low-pressure control unit; the second vent of the eleventh control valve 11 is connected to the second vent of the twelfth control valve 12; and the third vent of the eleventh control valve 11 is connected to the third vent of the low-pressure control unit. The first vent of the twelfth control valve 12 is connected to the first vent of the low-pressure control unit; and the third vent of the twelfth control valve 12 is connected to the second vent of the low-pressure control unit.

[0132] ⑤ Pressure monitoring unit:

[0133] In this embodiment, a pressure monitoring unit is also provided between the high-pressure control unit and the air spring unit. The pressure monitoring unit includes a pressure sensor 21, and the pressure detection end of the pressure sensor is connected to the second air supply line of the high-pressure control unit and the second air supply line of the air spring unit, respectively.

[0134] Under the control of the opening and closing of the air circuit by each control unit, the pressure sensor 21 can be connected to the first air spring 17, the second air spring 18, the third air spring 19, the fourth air spring 20, and the dual-chamber air tank 10 respectively to monitor the corresponding air pressure in real time.

[0135] ⑥ Depressurization air circuit control unit:

[0136] The pressure relief air circuit control unit includes a pressure limiting safety valve 4, which has an inlet and an outlet. The inlet of the pressure limiting safety valve 4 is connected to the outlet pipeline of the air compression unit, and the outlet of the pressure limiting safety valve 4 is connected to the outside atmosphere. This allows for automatic pressure relief when the air pressure in the air circuit system exceeds a threshold, preventing pipeline rupture, equipment damage, or even explosion due to excessive pressure, thus ensuring the safety of the entire system.

[0137] ⑦ Gas drying unit: A gas drying unit is provided between the high-pressure control unit and the air compression unit to filter moisture from the high-pressure gas;

[0138] The gas drying unit includes a dryer 5 and three ventilation lines. The dryer 5 is positioned between the first, second, and third ventilation lines of the gas drying unit. A one-way valve 6 is also installed on the third ventilation line of the gas drying unit. The one-way valve 6 has a throttling orifice 7 at both ends. One end of the throttling orifice 7 and one end of the one-way valve 6 are connected to the first ventilation line of the high-pressure control unit through the third ventilation line of the gas drying unit. The other end of the throttling orifice 7 and one-way valve 6 are connected to one end of the dryer 5. The other end of the dryer 5 is connected to the outlet line of the air compression unit through the second ventilation line of the gas drying unit, and the other end of the dryer 5 is connected to the exhaust line of the pressure relief control unit through the first ventilation line of the gas drying unit. This ensures that the entire system can filter moisture from high-pressure gas in real time, thereby preventing corrosion or blockage of related equipment and extending the lifespan of the entire system. Furthermore, the combination of the one-way valve and the throttling orifice forms a protective circuit, buffering and stabilizing pressure, and preventing pressure surges. Meanwhile, the depressurized airflow enables the dryer to self-clean and regenerate, reducing maintenance costs. In other words, a well-designed ventilation pipeline layout ensures efficient and stable gas supply, comprehensively improving the reliability and operational efficiency of the gas system.

[0139] ⑧ Air compression unit: The air compression unit includes an air filter 1 and an air compressor 3. The air compressor 3 is located between the air inlet pipe and the air outlet pipe of the air compression unit. The air inlet end of the air compressor 3 is connected to one end of the air filter 1 through the second control valve 2, and the other end of the air filter 1 is connected to the outside. The first air outlet end of the air compressor 3 is connected to the air outlet pipe of the air compression unit.

[0140] The air compression unit also has an external connection pipe, and the air compressor 3 also has a second air outlet, which is connected to the external connection pipe of the air compression unit. The external connection pipe also has a second control valve 2 and an air filter 1. The second air inlet of the air compressor 3 is connected to one end of the air filter 1 through the second control valve 2, and the other end of the air filter 1 is connected to the outside. The air filter can filter impurities and moisture from the air, thereby reducing compressor wear and extending the lifespan of related equipment.

[0141] like Figure 3 As shown, the control method for using an air compressor to draw air from the outside to replenish the high-pressure chamber of the dual-chamber air tank 10 in this embodiment is as follows:

[0142] First, open the eighth control valve 8 and the ninth control valve 9, and ensure that the second control valve 2, air compressor 3, check valve 6, eleventh control valve 11, twelfth control valve 12, first air spring control valve 13, second air spring control valve 14, third air spring control valve 15, and fourth air spring control valve 16 are all closed, thus connecting the pressure sensor 21 to the high-pressure chamber in the dual-chamber air tank 10. Use the pressure sensor 21 to measure the air pressure in the high-pressure chamber of the dual-chamber air tank 10. If the pressure in the dual-chamber air tank 10... If the current air pressure in the high-pressure chamber is lower than the normal air pressure range, then the eighth control valve 8 is closed, and the air compressor 3, the second control valve 2, and the one-way valve 6 are opened. Then the air compressor 3 is started to draw air from the outside to replenish the high-pressure chamber in the dual-chamber air tank 10 until the pressure sensor 21 detects that the air pressure in the high-pressure chamber of the dual-chamber air tank 10 is within the normal air pressure range. Then the air compressor 3, the second control valve 2, the one-way valve 6, and the ninth control valve 9 are closed to complete the air replenishment control of the high-pressure chamber in the dual-chamber air tank 10.

[0143] like Figure 4 As shown, the method for controlling the venting of the dual-chamber gas storage tank in this embodiment is as follows:

[0144] (1) Control method for venting the high-pressure chamber of a dual-chamber gas storage tank

[0145] First, open the eighth control valve 8 and the ninth control valve 9, and ensure that the second control valve 2, air compressor 3, check valve 6, eleventh control valve 11, twelfth control valve 12, first air spring control valve 13, second air spring control valve 14, third air spring control valve 15, and fourth air spring control valve 16 are all closed, thus connecting the pressure sensor 21 to the high-pressure chamber in the dual-chamber air tank 10. Use the pressure sensor 21 to measure the air pressure in the high-pressure chamber of the dual-chamber air tank 10. If the current air pressure in the high-pressure chamber of the dual-chamber air tank 10 is higher than the normal air pressure range, then open the second control valve 2, the air compressor 3, the check valve 6, the eleventh control valve 11, the twelfth control valve 12, the first air spring control valve 13, the second air spring control valve 14, the third air spring control valve 15, and the fourth air spring control valve 16. The twelve control valves 12, 13, 14, 15, and 16 release the high-pressure gas in the dual-chamber gas tank 10 to the outside until the pressure sensor 21 detects that the gas pressure in the high-pressure chamber of the dual-chamber gas tank 10 is within the normal pressure range. Then, the second control valve 2, eighth control valve 8, ninth control valve 9, 12, 13, 14, 15, and 16 are closed to complete the gas release control of the high-pressure chamber in the dual-chamber gas tank 10.

[0146] (2) Control method for venting the low-pressure chamber of a dual-chamber gas storage tank

[0147] First, open the eleventh control valve 11 and ensure that the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, ninth control valve 9, twelfth control valve 12, first air spring control valve 13, second air spring control valve 14, third air spring control valve 15, and fourth air spring control valve 16 are all closed, thus connecting the pressure sensor 21 with the low-pressure chamber in the dual-chamber air tank 10. Use the pressure sensor 21 to measure the air pressure in the low-pressure chamber of the dual-chamber air tank 10. If the current air pressure in the low-pressure chamber of the dual-chamber air tank 10 is higher than the normal air pressure range, open the second control valve 2 and the twelfth control valve 12 to release the gas in the low-pressure chamber of the dual-chamber air tank 10 to the outside until the pressure sensor 21 detects that the air pressure in the low-pressure chamber of the dual-chamber air tank 10 is within the normal air pressure range. Then close the second control valve 2, the eleventh control valve 11, and the twelfth control valve 12 to complete the gas release control of the low-pressure chamber in the dual-chamber air tank 10.

[0148] like Figure 5 As shown, the control method for inflating the air spring unit in this embodiment is as follows:

[0149] (1) Control method for inflating air spring unit using gas from the high-pressure chamber of a dual-chamber gas tank.

[0150] First, open the first air spring control valve 13 and the second air spring control valve 14, and ensure that the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, ninth control valve 9, eleventh control valve 11, twelfth control valve 12, third air spring control valve 15, and fourth air spring control valve 16 are all closed. Then, use pressure sensor 21 to monitor the air pressure of the front air spring. If the air pressure of the front air spring is less than the normal range (or the height of the front air spring is lower than the preset value), open the eighth control valve 8 and the ninth control valve 9 to allow the gas in the high-pressure chamber of the dual-chamber air tank 10 to enter the front air spring and inflate it until the air pressure of the front air spring is within the normal range and the height of the front air spring reaches the preset value. Finally, close the eighth control valve 8, the ninth control valve 9, the first air spring control valve 13, and the second air spring control valve 14.

[0151] Then, open the third air spring control valve 15 and the fourth air spring control valve 16, and ensure that the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, ninth control valve 9, eleventh control valve 11, twelfth control valve 12, first air spring control valve 13, and second air spring control valve 14 are all closed. Then, use pressure sensor 21 to monitor the air pressure of the rear air spring. If the air pressure of the rear air spring is less than the normal range or the height of the rear air spring is less than the preset value, open the eighth control valve 8 and the ninth control valve 9 to allow the gas in the high-pressure chamber of the dual-chamber air tank 10 to enter the rear air spring and inflate it until the air pressure of the rear air spring is within the normal range and the height of the rear air spring reaches the preset value. Finally, close the eighth control valve 8, the ninth control valve 9, the third air spring control valve 15, and the fourth air spring control valve 16.

[0152] (2) Control method for inflating air spring unit using external atmosphere

[0153] First, open the first air spring control valve 13 and the second air spring control valve 14, and ensure that the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, ninth control valve 9, eleventh control valve 11, twelfth control valve 12, third air spring control valve 15, and fourth air spring control valve 16 are all closed. Then, use pressure sensor 21 to monitor the air pressure of the front air spring. If the air pressure of the front air spring is less than the normal range (or the height of the front air spring is less than the preset value), open the second control valve 2, air compressor 3, check valve 6, and eighth control valve 8, and start the air compressor 3 to draw air from the outside to replenish the front air spring, inflating the front air spring until the air pressure of the front air spring is within the normal range and the height of the front air spring reaches the preset value. Finally, close the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, first air spring control valve 13, and second air spring control valve 14.

[0154] Then, open the third air spring control valve 15 and the fourth air spring control valve 16, and ensure that the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, ninth control valve 9, eleventh control valve 11, twelfth control valve 12, first air spring control valve 13, and second air spring control valve 14 are all closed. Then, use pressure sensor 21 to monitor the air pressure of the rear air spring. If the air pressure of the rear air spring is less than the normal range or the height of the rear air spring is less than the preset value, open the second control valve 2, air compressor 3, check valve 6, and eighth control valve 8, and start the air compressor 3 to draw air from the outside to replenish the rear air spring, inflating the rear air spring until the air pressure of the rear air spring is within the normal range and the height of the rear air spring reaches the preset value. Finally, close the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, third air spring control valve 15, and fourth air spring control valve 16.

[0155] like Figure 6 As shown, the method for controlling the deflation of the air spring in this embodiment is as follows:

[0156] (1) Control method for air spring to release air into the low-pressure chamber of the dual-chamber air tank

[0157] First, open the first air spring control valve 13 and the second air spring control valve 14, and ensure that the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, ninth control valve 9, eleventh control valve 11, twelfth control valve 12, third air spring control valve 15, and fourth air spring control valve 16 are all closed. Then, use pressure sensor 21 to monitor the air pressure of the front air spring. If the air pressure of the front air spring is greater than the normal range or the height of the front air spring exceeds the preset value, open the eleventh control valve 11 to allow the gas in the front air spring to enter the low-pressure chamber in the dual-chamber air tank 10 to exhaust the air from the front air spring until the air pressure of the front air spring is within the normal range and the height of the front air spring reaches the preset value. Finally, close the eleventh control valve 11, the first air spring control valve 13, and the second air spring control valve 14.

[0158] Then, open the third air spring control valve 15 and the fourth air spring control valve 16, and ensure that the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, ninth control valve 9, eleventh control valve 11, twelfth control valve 12, first air spring control valve 13, and second air spring control valve 14 are all closed. Then, use pressure sensor 21 to monitor the air pressure of the rear air spring. If the air pressure of the rear air spring is greater than the normal range (or the height of the rear air spring exceeds the preset value), open the eleventh control valve 11 to allow the gas in the rear air spring to enter the low-pressure chamber in the dual-chamber air tank 10 to exhaust the rear air spring until the air pressure of the rear air spring is within the normal range and the height of the rear air spring reaches the preset value. Finally, close the eleventh control valve 11, the third air spring control valve 15, and the fourth air spring control valve 16.

[0159] (2) Control method for releasing air from the air spring to the outside environment

[0160] First, open the first air spring control valve 13 and the second air spring control valve 14, and ensure that the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, ninth control valve 9, eleventh control valve 11, twelfth control valve 12, third air spring control valve 15, and fourth air spring control valve 16 are all closed. Then, use pressure sensor 21 to monitor the air pressure of the front air spring. If the air pressure of the front air spring is greater than the normal range or the height of the front air spring exceeds the preset value, open the second control valve 2 and the twelfth control valve 12 to release the gas in the front air spring to the outside, thus venting the front air spring, until the air pressure of the front air spring is within the normal range and the height of the front air spring reaches the preset value. Finally, close the second control valve 2, the twelfth control valve 12, the first air spring control valve 13, and the second air spring control valve 14.

[0161] Then, open the third air spring control valve 15 and the fourth air spring control valve 16, and ensure that the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, ninth control valve 9, eleventh control valve 11, twelfth control valve 12, first air spring control valve 13, and second air spring control valve 14 are all closed. Then, use pressure sensor 21 to monitor the air pressure of the rear air spring. If the air pressure of the rear air spring is greater than the normal range (or the height of the rear air spring exceeds the preset value), open the second control valve 2 and the twelfth control valve 12 to release the gas in the rear air spring to the outside, thus venting the rear air spring, until the air pressure of the rear air spring is within the normal range and the height of the rear air spring reaches the preset value. Finally, close the second control valve 2, the twelfth control valve 12, the third air spring control valve 15, and the fourth air spring control valve 16.

[0162] like Figure 7 As shown, the gas flow control method between the high and low pressure chambers in the dual-chamber gas storage tank 10 in this embodiment is as follows:

[0163] (1) First, use a pressure sensor to monitor whether the current air pressure in the low-pressure chamber of the dual-chamber air tank 10 has reached the set threshold: open the eleventh control valve 11, and ensure that the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, ninth control valve 9, twelfth control valve 12, first air spring control valve 13, second air spring control valve 14, third air spring control valve 15 and fourth air spring control valve 16 are all closed, so that the air path between the pressure sensor 21 and the low-pressure chamber in the dual-chamber air tank 10 is connected. Use the pressure sensor 21 to measure the air pressure in the low-pressure chamber of the dual-chamber air tank 10, determine whether the current air pressure in the low-pressure chamber of the dual-chamber air tank 10 has reached the set threshold, and close the eleventh control valve 11.

[0164] (2) Then, the pressure sensor is used to monitor whether the current air pressure in the high-pressure chamber of the dual-chamber gas tank 10 is lower than the set maximum threshold: the eighth control valve 8 and the ninth control valve 9 are opened to connect the air path between the pressure sensor 21 and the high-pressure chamber in the dual-chamber gas tank 10. The pressure sensor 21 is used to measure the air pressure in the high-pressure chamber of the dual-chamber gas tank 10 to determine whether the current air pressure in the high-pressure chamber of the dual-chamber gas tank 10 is lower than the set maximum threshold; and the eighth control valve 8 and the ninth control valve 9 are closed.

[0165] Based on the judgment results of the above two steps, if the current air pressure in the low-pressure chamber of the dual-chamber air tank 10 reaches the set threshold, while the current air pressure in the high-pressure chamber of the dual-chamber air tank 10 is lower than the set maximum threshold, then the air compressor 3, the one-way valve 6, the ninth control valve 9, the eleventh control valve 11 and the twelfth control valve 12 are opened, and the air compressor 3 is started again to draw air from the low-pressure chamber of the dual-chamber air tank 10 to supplement the high-pressure chamber of the dual-chamber air tank 10.

[0166] like Figure 8 As shown, the redundancy control method for the dual-chamber gas storage tank in this embodiment is as follows:

[0167] When the venting line of the high-pressure chamber in the dual-chamber air tank 10 fails or the high-pressure chamber cannot function properly, first open the eleventh control valve 11, and ensure that the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, ninth control valve 9, twelfth control valve 12, first air spring control valve 13, second air spring control valve 14, third air spring control valve 15, and fourth air spring control valve 16 are closed, thus connecting the pressure sensor 21 to the low-pressure chamber in the dual-chamber air tank 10. Use the pressure sensor 21 to measure the air pressure in the low-pressure chamber of the dual-chamber air tank 10. If the pressure sensor 21 is insufficient, the pressure will be determined by the pressure sensor 21. If the current air pressure in the low-pressure chamber of the dual-chamber air tank 10 is lower than the normal air pressure range, then the second control valve 2, air compressor 3, check valve 6 and eighth control valve 8 are opened, and the air compressor 3 is started to draw air from the outside to replenish the low-pressure chamber of the dual-chamber air tank 10 until the pressure sensor 21 detects that the air pressure in the low-pressure chamber of the air tank 10 is within the normal air pressure range. Then the second control valve 2, air compressor 3, check valve 6, eighth control valve 8 and eleventh control valve 11 are closed to complete the air replenishment control of the low-pressure chamber in the dual-chamber air tank 10, ensuring that the air storage unit can still work normally.

[0168] Then, open the first air spring control valve 13 and the second air spring control valve 14, and ensure that the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, ninth control valve 9, eleventh control valve 11, twelfth control valve 12, third air spring control valve 15, and fourth air spring control valve 16 are all closed. Then, use pressure sensor 21 to monitor the air pressure of the front air spring. If the air pressure of the front air spring is less than the normal range (or the height of the front air spring is lower than the preset value), open the eleventh control valve 11 to allow the gas in the low-pressure chamber of the dual-chamber air tank 10 to enter the front air spring and inflate it until the air pressure of the front air spring is within the normal range and the height of the front air spring reaches the preset value. Finally, close the eleventh control valve 11, the first air spring control valve 13, and the second air spring control valve 14.

[0169] Finally, open the third air spring control valve 15 and the fourth air spring control valve 16, and ensure that the second control valve 2, air compressor 3, check valve 6, eighth control valve 8, ninth control valve 9, eleventh control valve 11, twelfth control valve 12, first air spring control valve 13, and second air spring control valve 14 are all closed. Then, use pressure sensor 21 to monitor the air pressure of the rear air spring. If the air pressure of the rear air spring is less than the normal range or the height of the rear air spring is lower than the preset value, open the eleventh control valve 11 to allow the gas in the low-pressure chamber of the dual-chamber air tank 10 to enter the rear air spring and inflate it until the air pressure of the rear air spring is within the normal range and the height of the rear air spring reaches the preset value. Finally, close the eleventh control valve 11, the third air spring control valve 15, and the fourth air spring control valve 16.

[0170] In summary, the dual-chamber air tank redundancy control method of this scheme can utilize the air in the high-pressure chamber of the dual-chamber air tank 10 to complete the air spring unit inflation process when the air supply line of the high-pressure chamber in the dual-chamber air tank 10 fails or the high-pressure chamber cannot work normally.

[0171] like Figure 9 As shown, the control method for overpressure exhaust of the air suspension air circuit system in this embodiment is as follows:

[0172] When the pressure in the air suspension system exceeds the threshold of the pressure limiting safety valve, open the air compressor 3, the second control valve 2, and the pressure limiting safety valve 4, and ensure that the one-way valve 6, the eighth control valve 8, the ninth control valve 9, the eleventh control valve 11, the twelfth control valve 12, the first air spring control valve 13, the second air spring control valve 14, the third air spring control valve 15, and the fourth air spring control valve 16 are all closed. Then start the air compressor 3. If the air pressure at the outlet of the air compressor 3 is greater than the return spring force in the pressure limiting safety valve 4, the pressure limiting safety valve 4 will automatically open, allowing the air outlet of the air compressor 3 to be directly connected to the outside for exhaust, ensuring air circuit safety. This continues until the air pressure at the outlet of the air compressor 3 is less than or equal to the return spring force in the pressure limiting safety valve 4, at which point the pressure limiting safety valve 4 will automatically close, isolating the air outlet of the air compressor 3 from the outside.

[0173] It is worth noting that, under normal operating conditions, this air suspension system utilizes a dual-chamber air tank and the coordinated operation of various control units to achieve gas recycling within the system, forming a highly efficient closed-loop control system. Only when the air tank pressure exceeds a set threshold (e.g., the high-pressure chamber pressure is too low requiring replenishment, or the system is overpressurized and requires venting), or when the air spring height needs significant adjustment, will the system briefly switch to open-loop mode, activating the air compressor to replenish air from the outside or vent air through the pressure-limiting safety valve. Thanks to the dual-chamber redundant design and precise pressure monitoring mechanism, the system can prioritize the use of gas from the air tank for suspension height adjustment and pressure balance, greatly reducing the number of air compressor starts, effectively reducing energy consumption and equipment wear, and extending the overall service life of the air suspension system.

[0174] In summary, this invention not only enables the independent storage of high-pressure and low-pressure gases, but also allows for precise control of the air spring through coordinated control of the high and low-pressure gases.

[0175] Most importantly, by combining the dual-chamber air tank with the high and low pressure control units, a redundant air supply mechanism for the air suspension system is constructed, ensuring that the entire system can continue to operate even if a single chamber fails (when the high-pressure chamber fails, it can switch to the low-pressure chamber to continue working).

[0176] Meanwhile, this invention, through its design of independent storage of high and low pressure gases and on-demand gas supply, can further optimize gas compression and utilization efficiency, and significantly reduce the energy consumption of the entire air suspension system.

[0177] In other words, compared to the traditional single-chamber air storage structure, the dual-chamber air tank structure designed in this technical solution enhances the ability of the entire air suspension air circuit system to cope with sudden failures, optimizes gas utilization efficiency, and improves the stability, adaptability, and working efficiency of the entire air suspension system. This invention achieves flexible allocation and efficient transmission of gas within the air circuit system through precise pipeline connections between the low-pressure control unit, the high-pressure control unit, and other units. It can precisely control the inflation and deflation of the air spring unit and the gas storage and circulation of the air storage unit according to different operating conditions, thereby improving the comfort and controllability of the vehicle during driving.

[0178] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An air suspension air circuit system, characterized in that, It includes an air compression unit, an air spring unit, an air storage unit, a low-pressure control unit, and a high-pressure control unit. The air compression unit includes an inlet pipe and an outlet pipe. The air spring unit includes two air supply pipes. The air storage unit includes two air supply pipes. The low-pressure control unit includes three air supply pipes. The high-pressure control unit includes three air supply pipes. The gas storage unit includes a dual-chamber gas storage tank (10), the two chambers of which are a low-pressure chamber and a high-pressure chamber. The vent pipe of the high-pressure chamber serves as the first vent pipe of the gas storage unit and is connected to the third vent pipe of the high-pressure control unit. The vent pipe of the low-pressure chamber serves as the second vent pipe of the gas storage unit and is connected to the third vent pipe of the low-pressure control unit. The inlet pipe of the air compression unit is connected to the first vent pipe of the low-pressure control unit. The outlet pipe of the air compression unit is connected to the first vent pipe of the high-pressure control unit. The first vent pipe of the air spring unit is connected to the second vent pipe of the low-pressure control unit. The second vent pipe of the air spring unit is connected to the second vent pipe of the high-pressure control unit. This allows the low-pressure chamber to continue supplying high-pressure gas to the system in conjunction with the air compression unit when there is gas leakage in the high-pressure chamber.

2. The air suspension air circuit system according to claim 1, characterized in that, The air spring unit includes a first air spring control valve (13), a second air spring control valve (14), a third air spring control valve (15), a fourth air spring control valve (16), a first air spring (17), a second air spring (18), a third air spring (19), and a fourth air spring (20). The first air spring control valve (13), the second air spring control valve (14), the third air spring control valve (15), and the fourth air spring control valve (16) are all located between the first air supply line and the second air supply line of the air spring unit. The first air spring (17), the second air spring (18), the third air spring (19), and the fourth air spring (20) of the air spring unit are respectively connected to the second air supply line of the low-pressure control unit and the second air supply line of the high-pressure control unit through the first air spring control valve (13), the second air spring control valve (14), the third air spring control valve (15), and the fourth air spring control valve (16).

3. The air suspension air circuit system according to claim 1, characterized in that, The air compression unit is provided with an air compressor (3), which includes an air inlet and a first air outlet. The air compressor (3) is located between the air inlet pipe and the air outlet pipe of the air compression unit. The air inlet of the air compressor (3) is connected to the air inlet pipe of the air compression unit, and the first air outlet of the air compressor (3) is connected to the air outlet pipe of the air compression unit.

4. The air suspension air circuit system according to claim 3, characterized in that, The air compression unit is also provided with an external connection pipeline. The air compressor (3) is also provided with a second air outlet. The second air outlet of the air compressor (3) is connected to the external connection pipeline of the air compression unit. The external connection pipeline is also provided with a second control valve (2) and an air filter (1). The second air inlet of the air compressor (3) is connected to one end of the air filter (1) through the second control valve (2). The other end of the air filter (1) is connected to the outside.

5. The air suspension air circuit system according to claim 4, characterized in that, The air compression unit is also provided with a pressure relief air circuit control unit, which includes a pressure limiting safety valve (4). The pressure limiting safety valve (4) includes an inlet end and an outlet end. The inlet end of the pressure limiting safety valve (4) is connected to the outlet pipeline of the air compression unit, and the outlet end of the pressure limiting safety valve (4) is connected to the external communication pipeline of the air compression unit. The outlet end of the pressure limiting safety valve (4) is connected to the outside through an air filter (1).

6. The air suspension air circuit system according to claim 1, characterized in that, The high-pressure control unit is provided with an eighth control valve (8) and a ninth control valve (9), and the low-pressure control unit is provided with an eleventh control valve (11) and a twelfth control valve (12); the eighth control valve (8), the ninth control valve (9), the eleventh control valve (11) and the twelfth control valve (12) each include three vents; The first vent of the eighth control valve (8) is connected to the first vent of the high-pressure control unit; the second vent of the eighth control valve (8) is connected to the second vent of the ninth control valve (9); the third vent of the eighth control valve (8) is connected to the second vent of the high-pressure control unit; the first vent of the ninth control valve (9) is connected to the first vent of the high-pressure control unit; and the third vent of the ninth control valve (9) is connected to the third vent of the high-pressure control unit. The first vent of the eleventh control valve (11) is connected to the second vent of the low-pressure control unit, the second vent of the eleventh control valve (11) is connected to the second vent of the twelfth control valve (12), and the third vent of the eleventh control valve (11) is connected to the third vent of the low-pressure control unit; the first vent of the twelfth control valve (12) is connected to the first vent of the low-pressure control unit, and the third vent of the twelfth control valve (12) is connected to the second vent of the low-pressure control unit.

7. The air suspension air circuit system according to claim 5, characterized in that, A gas drying unit is provided between the high-pressure control unit and the air compression unit. The gas drying unit includes a dryer (5) and three ventilation pipes. The dryer (5) is located between the first ventilation pipe, the second ventilation pipe and the third ventilation pipe of the gas drying unit. A one-way valve (6) is also provided on the third ventilation pipe of the gas drying unit. A throttling orifice (7) is provided at both ends of the one-way valve (6). One end of the throttling orifice (7) and the one-way valve (6) are connected to the first ventilation pipe of the high-pressure control unit through the third ventilation pipe of the gas drying unit. The other end of the throttling orifice (7) and the one-way valve (6) are connected to one end of the dryer (5). The other end of the dryer (5) is connected to the outlet pipe of the air compression unit through the second ventilation pipe of the gas drying unit, and the other end of the dryer (5) is connected to the exhaust pipe of the pressure relief gas control unit through the first ventilation pipe of the gas drying unit.

8. The air suspension air circuit system according to claim 1, characterized in that, A pressure monitoring unit is also provided between the high-pressure control unit and the air spring unit. The pressure monitoring unit includes a pressure sensor (21). The pressure detection end of the pressure sensor (21) is connected to the second ventilation pipe of the high-pressure control unit and the second ventilation pipe of the air spring unit, respectively.

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