Heatable regenerative air supply unit for air suspension

Abstract

The application discloses a kind of for air suspension heated regeneration air supply unit, it is related to air suspension technical field.The valve body subassembly assembly, solenoid valve subassembly assembly and ECU subassembly assembly are included;Valve body subassembly assembly includes metal matrix and embedding in it and with it heat conduction contact brushless motor, piston pump and drying tank;Valve body subassembly assembly introduces outside air to piston pump, compressed gas is delivered to drying tank, and compressed gas after drying is delivered to solenoid valve subassembly assembly;ECU subassembly assembly is switched by PCB drive plate control each solenoid valve to switch air path.The valve body subassembly assembly, solenoid valve subassembly assembly and ECU subassembly assembly are independent modular units, and only need to replace corresponding module when fault occurs.The heating of brushless motor stator coil is utilized, and the drying tank is heated by the metal matrix, and the drying tank is regenerated by high pressure gas, and the efficiency is significantly improved, and the service life of the drying tank is prolonged.

Description

Technical Field

[0001] This invention relates to the field of air suspension technology, and more specifically to a heated regenerable air supply unit for air suspension. Background Technology

[0002] With the development of automotive technology, air suspension is being used more and more widely. The air supply unit is the core actuator of the air suspension. Under the command of the ECU, it compresses outside air and supplies it to the air springs or air tanks, or releases high-pressure gas within the system to adjust the vehicle height. Its performance directly affects the suspension system's response speed, control precision, and overall vehicle reliability.

[0003] The working principle of an air suspension system is mainly as follows: The ECU (Electronic Control Unit) collects signals from sensors such as vehicle height, acceleration, and pressure. After system calculation and analysis, it sends commands to control the system's operation. The core component of its actuator is an air compressor pump, which, driven by a motor, compresses atmospheric air and delivers it to the system, providing power for the raising and lowering of the air springs. This air compressor pump, along with its associated air circuit control components, drying components, and the ECU, constitute the air supply unit. As a complete actuator assembly, the air supply unit is responsible for controlling the inflation, deflation, and pressure maintenance of the air springs according to the ECU's commands.

[0004] Patent application number 201580019730.9 discloses an integrated air supply unit, which includes an air compressor with a motor and an air dryer. The air compressor, motor, air dryer, and multiple pneumatic connections form an integrated energy unit. This solution integrates components such as the compressor, dryer, and pneumatic valves into one unit, and switches the air path through a solenoid valve to achieve different control logics, thereby controlling the inflation and deflation of the air springs and adjusting the vehicle height.

[0005] However, the technical solution disclosed by D1 still has the following technical problems:

[0006] First, maintenance costs are high and troubleshooting is difficult.

[0007] All components (compressor, motor, dryer, pneumatic valves, sensors, etc.) are fixed to the same pneumatic connection. When a component fails, the entire air supply unit must be replaced, making it impossible to replace a single faulty module, which leads to maintenance difficulties.

[0008] Second, the dryer has low regeneration efficiency and high failure rate.

[0009] The regeneration of the drying tank relies on passive backflushing during natural venting of the system, which is inefficient. As the usage time increases, the drying effect drops sharply after the desiccant becomes saturated. Insufficiently dried, hot and humid air enters the downstream solenoid valves and air springs, which can easily cause internal corrosion and affect the reliability and lifespan of the system.

[0010] Third, it has poor scalability.

[0011] The air passage of D1 is formed by drilling inside the pneumatic block. Increasing or decreasing the number of solenoid valves requires redesigning and processing the entire pneumatic block, which has a long development cycle and high cost, and is difficult to adapt to the different needs of different vehicle models for the number of air spring control passages. Summary of the Invention

[0012] The purpose of this invention is to provide a heatable regenerable air supply unit for air suspension, which solves the problems of difficult maintenance and low regeneration efficiency of existing air supply units in the prior art.

[0013] To achieve the above objectives, the present invention provides a heated regenerative air supply unit for air suspension, comprising a valve body sub-assembly, a solenoid valve sub-assembly, and an ECU sub-assembly. The valve body sub-assembly includes a metal substrate, a brushless motor, a piston pump, and a dryer. The metal substrate has mounting cavities for accommodating the brushless motor, piston pump, and dryer, which are embedded in their respective mounting cavities. All three components are in thermal contact with the metal substrate. The brushless motor drives the piston pump to reciprocate to compress air. The solenoid valve sub-assembly includes a valve base and a PCB. A drive board and multiple solenoid valves are mounted on a valve base. The PCB drive board is electrically connected to the coils of each solenoid valve. The solenoid valve sub-assembly is connected to the valve body sub-assembly via a detachable air path interface. The valve body sub-assembly introduces outside air into the piston pump, and the compressed gas is delivered to a drying tank. The dried compressed gas is then delivered to the solenoid valve sub-assembly. The ECU sub-assembly is connected to the solenoid valve sub-assembly via a detachable communication interface. The ECU sub-assembly controls the on / off state of each solenoid valve through the PCB drive board to switch the air path.

[0014] The valve body sub-assembly, solenoid valve sub-assembly, and ECU sub-assembly are independent and detachable modular units. When one module fails, only the faulty module needs to be replaced, without replacing the entire unit, significantly reducing repair time and costs.

[0015] The brushless motor stator coil embedded in the metal substrate is energized and heated, and the drying tank is heated through the heat conduction of the metal substrate. At the same time, high-pressure gas from the gas storage tank or air spring is accelerated by a one-way throttle valve and then back-blown to purge the drying tank. The regeneration efficiency of the drying tank is significantly improved, which can effectively extend the service life of the drying tank, ensure that downstream solenoid valves and air springs are protected from corrosion by humid and hot air, and improve the reliability and durability of the entire system.

[0016] Furthermore, the metal substrate has an intake channel, a compression channel, a supply channel, and an exhaust channel formed thereon; the outlet of the intake channel is connected to the intake port of the piston pump, for introducing outside air into the piston pump; one end of the compression channel is connected to the outlet of the piston pump, and the other end is connected to the intake port of the drying tank, for delivering the gas compressed by the piston pump to the drying tank; one end of the supply channel is connected to the outlet of the drying tank, and the other end is connected to the air passage interface between the valve body sub-assembly and the solenoid valve sub-assembly, for supplying air to the drying tank. The dried compressed gas is delivered to the solenoid valve sub-assembly; the exhaust channel connects the exhaust port of the drying tank to the outside; the valve body sub-assembly integrates a first one-way valve and a one-way throttle valve, the first one-way valve being disposed on the intake channel; the one-way throttle valve being disposed on the supply channel, the one-way throttle valve including a one-way valve section and a throttle orifice section, when the piston pump supplies gas to the solenoid valve sub-assembly, the one-way valve section opens, and the supply channel is open; when the exhaust valve is opened for regeneration purging, the gas is throttled by the throttle orifice section and flows in reverse through the drying tank, and then discharged through the exhaust channel.

[0017] Furthermore, the valve body sub-assembly also includes a safety valve, one end of which is connected to the outlet of the piston pump, and the other end is connected to the air intake channel on the side where the inlet of the first one-way valve is located.

[0018] Furthermore, the solenoid valve sub-assembly integrates a temperature, humidity, and pressure sensor, which detects the humidity, temperature, and pressure of the gas downstream of the drying tank and communicates with the ECU sub-assembly.

[0019] Furthermore, when the humidity value detected by the temperature, humidity and pressure sensor reaches the preset upper limit, the ECU sub-assembly controls the brushless motor to be in a single-phase power supply state, so that the stator coil of the brushless motor is energized and heated, and the heat is conducted to the drying tank through the metal substrate of the valve body sub-assembly.

[0020] When the temperature value detected by the temperature, humidity and pressure sensor reaches the preset temperature threshold or the power-on heating time reaches the preset time threshold, the ECU sub-component assembly controls the exhaust valve to open, so that the compressed gas is accelerated and depressurized through the small hole of the one-way throttle valve and then blows the drying tank to remove moisture.

[0021] When the humidity value detected by the humidity sensor drops to a preset lower limit, the ECU sub-assembly controls the exhaust valve to close and stops the single-phase power supply to the brushless motor.

[0022] Furthermore, the solenoid valve sub-assembly also includes:

[0023] Inlet and outlet connectors are used to connect to an external air source or exhaust port;

[0024] Quick-connect tubing connectors are used to connect external pneumatic actuators or air tanks;

[0025] The solenoid valve sub-assembly connector is used to connect to the ECU sub-assembly assembly.

[0026] Furthermore, the piston pump and the brushless motor are arranged coaxially along the axial direction of the metal substrate, and the piston cylinder of the piston pump and the stator of the brushless motor are both in thermal contact with the inner wall of the metal substrate.

[0027] Furthermore, the air passage interface between the valve body sub-assembly and the solenoid valve sub-assembly is a riveted pipe interface or a sealed plug-in interface.

[0028] Furthermore, the air circuit interface includes air hole one, air hole two and air hole three provided on the metal base of the valve body sub-assembly, and connector one, connector two and connector three provided on the valve base of the solenoid valve sub-assembly. Connector one is inserted into air hole one, connector two is inserted into air hole two, and connector three is inserted into air hole three.

[0029] The air inlet of the air inlet and the air outlet of the air inlet and the air outlet of the air outlet are connected to the first connector, the first air outlet is connected to the compression chamber of the valve body sub-assembly, the second air outlet is connected to the exhaust port of the dryer, and the third connector is connected to the exhaust port of the air inlet and the air outlet of the air inlet and the air outlet.

[0030] This invention offers the following advantages: The air supply unit comprises three independent modules: a valve body sub-assembly, a solenoid valve sub-assembly, and an ECU sub-assembly. These modules are connected via detachable interfaces. When a module malfunctions, only the faulty module needs to be replaced, eliminating the need to replace the entire unit, significantly reducing repair time and costs.

[0031] The brushless motor stator coil embedded in the metal substrate is energized and heated, and the drying tank is heated through the heat conduction of the metal substrate. At the same time, high-pressure gas from the gas storage tank or air spring is accelerated by a one-way throttle valve and then back-blown to purge the drying tank, actively removing the moisture adsorbed in the molecular sieve. This significantly improves the regeneration efficiency, effectively extends the service life of the drying tank, ensures that the downstream solenoid valve and air spring are protected from corrosion by humid and hot air, and improves the reliability and durability of the entire air spring system.

[0032] When it is necessary to add or remove air spring control paths, only the solenoid valve sub-assembly needs to be redesigned and replaced. The valve body sub-assembly and ECU sub-assembly are not affected, which is highly expandable and has low expansion cost.

[0033] The use of a brushless motor eliminates the lifespan limitations and electrical noise caused by carbon brush wear. The motor is embedded inside a thick metal substrate, which acts as a natural sound barrier, effectively absorbing and blocking the high-frequency noise generated during motor operation. Attached Figure Description

[0034] Figure 1 This is a front view of the heatable regenerable air supply unit disclosed in this invention;

[0035] Figure 2 This is a top view of the heatable regenerable air supply unit disclosed in this invention;

[0036] Figure 3 This is a schematic diagram of the valve body sub-assembly structure;

[0037] Figure 4 Schematic diagram of the solenoid valve sub-assembly structure Figure 1 ;

[0038] Figure 5 Schematic diagram of the solenoid valve sub-assembly structure Figure 2 ;

[0039] Figure 6 This is an electrical schematic diagram.

[0040] In the diagram, the components are: valve body sub-assembly 1, metal substrate 1-1, air port 1-11, air port 2-12, air port 3-1-13, dryer 1-2, brushless motor 1-3, piston pump 1-4, one-way throttle valve 1-5, safety valve 1-6, exhaust valve 1-7, first one-way valve 1-8, second one-way valve 1-9, exhaust screw 1-10; solenoid valve sub-assembly 2, valve base 2-1, connector 1-11, connector 2-12, connector 3-13, solenoid valve 2-2, switching valve 2-21, air spring valve 2-22, temperature, humidity and pressure sensor 2-3, intake and exhaust connectors 2-4, quick-connect air hose connector 2-5, solenoid valve sub-assembly connector 2-6; ECU sub-assembly 3, ECU connector 3-1, air spring 4, air tank 5, and filter 6. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] The terms "upper," "lower," "top," and "bottom," etc., indicate the direction or positional relationship based on Figure 3 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the figures are for illustrative purposes only and should not be construed as limiting the present invention. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0044] Heated regenerative air supply unit for air suspension, such as Figure 1 and Figure 2 As shown, it includes valve body sub-assembly 1, solenoid valve sub-assembly 2, and ECU sub-assembly 3.

[0045] Among them, such as Figure 3 As shown, the valve body sub-assembly 1 includes a metal substrate 1-1, a brushless motor 1-3, a piston pump 1-4, and a drying tank 1-2. The metal substrate 1-1 has mounting cavities for accommodating the brushless motor 1-3, the piston pump 1-4, and the drying tank 1-2. The brushless motor 1-3, the piston pump 1-4, and the drying tank 1-2 are embedded in the corresponding mounting cavities, and all three are in thermally conductive contact with the metal substrate 1-1. The brushless motor 1-3 drives the piston pump 1-4 to reciprocate to compress air.

[0046] like Figure 4 As shown, the solenoid valve sub-assembly 2 includes a valve base 2-1, a PCB driver board, and multiple solenoid valves 2-2. The PCB driver board and the multiple solenoid valves 2-2 are mounted on the valve base 2-1. Specifically, if the valve base 2-1 is a plastic part, the solenoid valves 2-2 are connected to the valve base 2-1 through a potting process; if the valve base 2-1 is a metal part, the solenoid valves 2-2 are connected to the valve base 2-1 through press-fitting. The PCB driver board is connected to the coils of each solenoid valve 2-2 via pins. Figure 6 As shown, these solenoid valves 2-2 include multiple switching valves 2-21 and multiple air spring valves 2-22.

[0047] The solenoid valve sub-assembly 2 also includes an inlet / outlet connector 2-4, a quick-connect air hose connector 2-5, and a solenoid valve sub-assembly connector 2-6. The inlet / outlet connector 2-4 is used to connect to an external air source or exhaust port. The quick-connect air hose connector 2-5 is used to connect to an external pneumatic actuator (such as an air spring 4), for example... Figure 4 There are five quick-connect fittings 2-5 for the air hoses, four of which are used to connect to the air springs 4 and the other is used to connect to the air tank 5. The solenoid valve sub-assembly connector 2-6 is plugged into the ECU sub-assembly 3 to connect the ECU sub-assembly 3 and the solenoid valve sub-assembly 2, so as to control the opening and closing of each solenoid valve 2-2.

[0048] The ECU sub-assembly 3 is provided with an ECU connector 3-1, which enables the ECU sub-assembly 3 to be connected to the vehicle's main control system.

[0049] The solenoid valve sub-assembly 2 is connected to the valve body sub-assembly 1 via a detachable air interface and an electrical interface;

[0050] The ECU sub-assembly 3 is connected to the solenoid valve sub-assembly 2 via a detachable communication interface. The ECU sub-assembly 3 controls the opening and closing of each solenoid valve 2-2 via a PCB driver board to switch the air path.

[0051] In this design, the valve body sub-assembly 1, the solenoid valve sub-assembly 2, and the ECU sub-assembly 3 are independent and detachable modular units. When one of these modules fails, only the faulty module needs to be replaced, without replacing the entire unit, significantly reducing repair time and costs.

[0052] The brushless motor stator coil embedded in the metal substrate 1-1 is energized and heats up, which in turn heats the drying tank 1-2 through the metal substrate 1-1. Simultaneously, high-pressure gas from the gas storage tank 5 or the air spring 4 is throttled and accelerated by the one-way throttle valve 1-5 and then blows back through the drying tank 1-2. The reverse-flowing gas carries away the desorbed moisture from the molecular sieve in the drying tank 1-2, thus achieving the purging and regeneration of the drying tank 1-2. The regeneration efficiency of the drying tank 1-2 is significantly improved, which can effectively extend the service life of the drying tank 1-2, ensure that downstream solenoid valves and air springs 4 are protected from corrosion by humid and hot air, and improve the reliability and durability of the entire system.

[0053] like Figure 6As shown, the valve body sub-assembly 1 includes an intake channel, a compression channel, an air supply channel, and an exhaust channel formed on a metal substrate 1-1. These channels can be pneumatic pipes or pneumatic channels. The intake port at one end of the intake channel is connected to an air filter 6, and the outlet at the other end is connected to the intake port of the piston pump 1-4. A first one-way valve 1-8 is provided on the intake channel to filter and deliver outside air to the piston pump 1-4.

[0054] The air compressed by the piston pump 1-4 passes through the second one-way valve 1-9. On the one hand, it can be discharged into the environment through the exhaust channel, and on the other hand, it can be dried through the drying tank 1-2 through the compression channel. It is then transmitted to the solenoid valve sub-assembly 2 through the air supply channel. The switching valve 2-21 of the solenoid valve sub-assembly 2 supplies air to the air spring 4 through the corresponding air spring valve 2-22.

[0055] The air tank 5 is used to store dry air. When needed, the corresponding switching valve 2-21 is opened to directly supply dry air to the air spring 4. During installation, the air tank 5 is connected to the quick-connect fitting 2-5 of the air pipe of the solenoid valve sub-assembly 2.

[0056] The one-way throttle valve 1-5 integrated in the valve body sub-assembly 1 is riveted to the metal substrate 1-1 and is set on the air supply channel. The one-way throttle valve 1-5 includes a one-way valve part and a throttle orifice part. When the piston pump 1-4 supplies air to the solenoid valve sub-assembly 2, its one-way valve part opens and the air supply channel is open. When the exhaust valve 1-7 is opened for regeneration purging, the gas flows in reverse through its throttle orifice part and then through the drying tank 1-2, and is discharged through the exhaust channel. The reverse flow of gas will carry away the desorbed moisture in the molecular sieve of the drying tank 1-2, realizing the purging and regeneration of the drying tank 1-2. This is the main regeneration path.

[0057] The valve body sub-assembly 1 also includes an exhaust screw 1-10, which is mounted on the metal substrate 1-1 and connected to the air inlet of the dryer 1-2. During maintenance, unscrewing the exhaust screw 1-10 allows for the safe release of residual high-pressure air within the valve body sub-assembly 1. Furthermore, during pressure relief using the exhaust screw 1-10, the high-pressure gas in the system flows in reverse from the exhaust port of the dryer 1-2 through the entire interior of the dryer 1-2, and then exits from the exhaust screw 1-10 on the air inlet side. In this process, the reverse-flowing gas carries away the desorbed moisture from the molecular sieve of the dryer 1-2, achieving purging and regeneration of the dryer 1-2.

[0058] The valve body sub-assembly 1 also includes a safety valve 1-6. One end of the safety valve 1-6 is connected to the outlet of the piston pump 1-4, and the other end is connected to the air inlet channel on the side where the inlet of the first one-way valve 1-8 is located, for releasing pressure when the system pressure exceeds the limit.

[0059] Furthermore, the solenoid valve sub-assembly 2 integrates a temperature, humidity and pressure sensor 2-3, which detects the humidity, temperature and pressure of the gas downstream of the drying tank 1-2 and is communicatively connected to the ECU sub-assembly 3.

[0060] When the humidity value detected by the temperature and humidity pressure sensor 2-3 reaches the preset upper limit, the ECU sub-assembly 3 controls the brushless motor 1-3 to be in a single-phase power supply state, so that the stator coil of the brushless motor 1-3 is energized and heated, and the heat is conducted to the drying tank 1-2 through the metal substrate 1-1 of the valve body sub-assembly 1.

[0061] When the temperature value detected by the temperature, humidity and pressure sensor 2-3 reaches the preset temperature threshold or the power-on heating time reaches the preset time threshold, the ECU sub-component assembly 3 controls the exhaust valve 1-7 to open, so that the compressed gas is accelerated and depressurized through the small hole of the one-way throttle valve 1-5 and then blows the drying tank 1-2 to remove moisture.

[0062] When the humidity value detected by the humidity sensor 1-12 drops to a preset lower limit, the ECU sub-assembly 3 controls the exhaust valve 1-7 to close and stop the single-phase power supply to the brushless motor 1-3.

[0063] The system generates heat by using a single-phase power supply from the motor coil. After heating the molecular sieve, it circulates with external gas, which improves the regeneration capacity of the drying performance and extends the maintenance-free service life of the system.

[0064] For ease of connection, preferably, the air passage interface between the valve body sub-assembly 1 and the solenoid valve sub-assembly 2 is a riveted pipe interface or a sealed plug-in interface.

[0065] like Figure 3 and Figure 5 As shown, the air circuit interface includes air hole 1-11, air hole 1-12 and air hole 1-13 provided on the metal base 1-1 of the valve body sub-assembly 1, and connector 2-11, connector 2-12 and connector 2-13 provided on the valve base 2-1 of the solenoid valve sub-assembly 2. Connector 2-11 is inserted into air hole 1-11, connector 2-12 is inserted into air hole 2-12, and connector 2-13 is inserted into air hole 3-13.

[0066] The air inlet of the air inlet and exhaust connector 2-4 is connected to connector 1-11, the air port 1-11 is connected to the compression chamber of valve body sub-assembly 1, the air port 2-12 is connected to the exhaust port of dryer 1-2, and the connector 3-13 is connected to the exhaust port of air inlet and exhaust connector 2-4.

[0067] External air, filtered by filter 6, enters through the inlet of inlet / outlet connector 2-4 of solenoid valve subassembly 2 and directly enters the compression chamber of valve body subassembly 1 via connector 2-11. After compression, the gas is dried in valve body subassembly 1 by dryer 1-2 and then delivered to solenoid valve subassembly 2 via air port 1-12 and connector 2-12. The corresponding solenoid valve 2-2 is opened, allowing compressed gas to flow into air spring 4 and air tank 5. During exhaust, exhaust valve 1-7 is opened, and air is discharged through air port 1-12 and connector 2-13 via exhaust port 2-4 of solenoid valve subassembly 2.

[0068] Although the present invention has been described herein with reference to embodiments thereof, the above embodiments are merely general implementations of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heated regenerative air supply unit for air suspension, characterized in that, It includes a valve body sub-assembly (1), a solenoid valve sub-assembly (2), and an ECU sub-assembly (3). The valve body sub-assembly (1) includes a metal substrate (1-1), a brushless motor (1-3), a piston pump (1-4), and a drying tank (1-2). The metal substrate (1-1) has mounting cavities for accommodating the brushless motor (1-3), the piston pump (1-4), and the drying tank (1-2). The brushless motor (1-3), the piston pump (1-4), and the drying tank (1-2) are embedded in the corresponding mounting cavities. The brushless motor (1-3), the piston pump (1-4), and the drying tank (1-2) are all in thermal contact with the metal substrate (1-1). The brushless motor (1-3) drives the piston pump (1-4) to reciprocate to compress air. The solenoid valve sub-assembly (2) includes a valve base (2-1), a PCB drive board and multiple solenoid valves (2-2). The PCB drive board and multiple solenoid valves (2-2) are mounted on the valve base (2-1). The PCB drive board is electrically connected to the coil of each solenoid valve (2-2). The solenoid valve sub-assembly (2) is connected to the valve body sub-assembly (1) via a detachable air passage interface; The valve body sub-assembly (1) introduces outside air into the piston pump (1-4), and the compressed gas compressed by the piston pump (1-4) is delivered to the drying tank (1-2), and the dried compressed gas is delivered to the solenoid valve sub-assembly (2). The ECU sub-assembly (3) and the solenoid valve sub-assembly (2) are connected through a detachable communication interface. The ECU sub-assembly (3) controls the opening and closing of each solenoid valve (2-2) through a PCB driver board to switch the air path.

2. The heated regenerative air supply unit for air suspension according to claim 1, characterized in that, An air intake channel, a compression channel, an air supply channel, and an exhaust channel are formed on the metal substrate (1-1); the air outlet of the air intake channel is connected to the air intake of the piston pump (1-4) to introduce outside air into the piston pump (1-4); one end of the compression channel is connected to the air outlet of the piston pump (1-4), and the other end is connected to the air intake of the drying tank (1-2) to transport the gas compressed by the piston pump (1-4) to the drying tank (1-2); one end of the air supply channel is connected to the air outlet of the drying tank (1-2), and the other end is connected to the air passage interface between the valve body sub-assembly (1) and the solenoid valve sub-assembly (2) to transport the compressed gas dried by the drying tank to the solenoid valve sub-assembly (2); the exhaust channel connects the exhaust port of the drying tank (1-2) to the outside air. The valve body sub-assembly (1) integrates a first one-way valve (1-8) and a one-way throttle valve (1-5). The first one-way valve (1-8) is located on the air intake channel. The one-way throttle valve (1-5) is located on the air supply channel. The one-way throttle valve (1-5) includes a one-way valve part and a throttle orifice part. When the piston pump (1-4) supplies air to the solenoid valve sub-assembly (2), the one-way valve part opens and the air supply channel is open. When the exhaust valve (1-7) is opened for regeneration purging, the gas is throttled by the throttle orifice part and flows in the opposite direction through the drying tank (1-2), and then discharged through the exhaust channel.

3. The heated regenerative air supply unit for air suspension according to claim 2, characterized in that, The valve body sub-assembly (1) also includes a safety valve (1-6), one end of which is connected to the outlet of the piston pump (1-4), and the other end is connected to the air intake channel on the side where the air intake of the first one-way valve (1-8) is located.

4. The heated regenerative air supply unit for air suspension according to any one of claims 1-3, characterized in that, The solenoid valve sub-assembly (2) integrates a temperature, humidity and pressure sensor (2-3), which detects the gas humidity, temperature and pressure downstream of the drying tank (1-2) and communicates with the ECU sub-assembly (3).

5. The heated regenerative air supply unit for air suspension according to claim 4, characterized in that, When the humidity value detected by the temperature and humidity pressure sensor (2-3) reaches the preset upper limit, the ECU sub-component assembly (3) controls the brushless motor (1-3) to be in a single-phase power supply state, so that the stator coil of the brushless motor (1-3) is energized and heated, and the heat is conducted to the drying tank (1-2) through the metal substrate (1-1) of the valve body sub-component assembly (1). When the temperature value detected by the temperature and humidity pressure sensor (2-3) reaches the preset temperature threshold or the power-on heating time reaches the preset time threshold, the ECU sub-component assembly (3) controls the exhaust valve (1-7) to open, so that the compressed gas is accelerated and depressurized through the small hole of the one-way throttle valve (1-5) and blows the drying tank (1-2) to remove moisture. When the humidity value detected by the humidity sensor (1-12) drops to a preset lower limit, the ECU sub-assembly (3) controls the exhaust valve (1-7) to close and stop the single-phase power supply to the brushless motor (1-3).

6. The heated regenerative air supply unit for air suspension according to claim 1, characterized in that, The piston pump (1-4) and the brushless motor (1-3) are arranged coaxially along the axial direction of the metal substrate (1-1). The piston cylinder of the piston pump (1-4) and the stator of the brushless motor (1-3) are both in thermal contact with the inner wall of the metal substrate (1-1).

7. The heated regenerative air supply unit for air suspension according to claim 1, characterized in that, The solenoid valve sub-assembly (2) also includes: Inlet and outlet connectors (2-4) are used to connect to an external air source or exhaust port; Quick-connect tubing connectors (2-5) are used to connect external pneumatic actuators or air tanks; The solenoid valve sub-assembly connector (2-6) is used to connect to the ECU sub-assembly (3).

8. The heated regenerative air supply unit for air suspension according to claim 7, characterized in that, The air passage interface between the valve body sub-assembly (1) and the solenoid valve sub-assembly (2) is a riveted pipe interface or a sealed plug-in interface.

9. The heated regenerative air supply unit for air suspension according to claim 8, characterized in that, The air circuit interface includes air hole one (1-11), air hole two (1-12) and air hole three (1-13) provided on the metal base (1-1) of the valve body sub-assembly (1), and connector one (2-11), connector two (2-12) and connector three (2-13) provided on the valve base (2-1) of the solenoid valve sub-assembly (2). Connector one (2-11) is inserted into air hole one (1-11), connector two (2-12) is inserted into air hole two (1-12), and connector three (2-13) is inserted into air hole three (1-13). The air inlet of the air inlet and exhaust connector (2-4) is connected to connector one (2-11), the air hole one (1-11) is connected to the compression chamber of the valve body sub-assembly (1), the air hole two (1-12) is connected to the exhaust port of the dryer (1-2), and the connector three (2-13) is connected to the exhaust port of the air inlet and exhaust connector (2-4).

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