Air suspension control system and method of controlling the same

Abstract

The application relates to an air suspension control system and a control method thereof, and is applied to the technical field of air suspension. The air suspension control system comprises a controller, a valve body, an air tank, a one-way flow motor and a maintenance unit arranged outside the valve body. The maintenance unit comprises an exhaust valve, a high-pressure dryer and a flow limiting valve, and is connected to the valve body through an external explosion-proof pipeline. The air tank is used for storing air. When the high-pressure dryer is subjected to drying regeneration, the controller opens a first reversing valve in the valve body, controls the air in the air tank to flow to the atmospheric environment through the first reversing valve, the external explosion-proof pipeline, the flow limiting valve, the high-pressure dryer and the exhaust valve in sequence, and does not flow through the internal air path of the valve body. When the dryer is regenerated, the application can avoid the erosion of high-humidity gas on the internal air path and components of the valve body, and facilitates replacement and maintenance.

Description

Technical Field

[0001] This application relates to the field of air suspension technology, and in particular to an air suspension control system and its control method. Background Technology

[0002] During continuous operation, the dryer in an air suspension system gradually becomes saturated, leading to a significant reduction in drying efficiency and affecting the normal operation and long-term stability of the air suspension. To avoid system performance degradation and potential failures, regular regeneration of the dryer becomes crucial.

[0003] In related technologies, the air suspension exhaust valve and dryer are located inside the valve body. When the dryer regenerates, it produces high-humidity gas, which continuously passes through the exhaust valve, causing the exhaust valve and valve body's air passages to easily corrode and become damaged. Moreover, replacement is inconvenient, causing problems for equipment maintenance and normal use. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides an air suspension control system and its control method.

[0005] According to a first aspect of this application, an air suspension control system is provided, comprising: a controller, a valve body, an air tank, a one-way flow motor, and a maintenance unit disposed outside the valve body. The maintenance unit includes: an exhaust valve, a high-pressure dryer, and a flow restrictor valve. The maintenance unit is connected to the valve body via an external explosion-proof pipe.

[0006] The gas storage tank is used to store air;

[0007] The controller is used to open the first reversing valve in the valve body when the high-pressure dryer is being dried and regenerated, so as to control the air in the air tank to flow into the atmosphere in sequence through the first reversing valve, the external explosion-proof pipe, the flow limiting valve, the high-pressure dryer and the exhaust valve, and not to flow through the internal air passage of the valve body.

[0008] Optionally, the air suspension control system further includes: a load valve; one end of the load valve is connected to the motor, and the other end is connected to an external load interface;

[0009] The controller is used to acquire the pressure of the air tank when inflating the external load, and determine the air path used for inflating the external load according to the pressure of the air tank and the type of the external load, and control the air to enter the external load through the motor and load valve in the air path.

[0010] Optionally, the controller is specifically configured to open the second reversing valve in the valve body when it is determined that the air path used for charging the external load is the air path of the air storage tank, so as to control the air in the air storage tank to enter the external load in sequence through the second reversing valve, the motor and the load valve.

[0011] Optionally, the air suspension control system further includes a low-pressure dryer disposed outside the valve body;

[0012] The controller is specifically used to control air from the atmosphere to enter the external load sequentially through the low-pressure dryer, the motor, and the load valve when it is determined that the air path used for charging the external load is an atmospheric air path.

[0013] Optionally, the controller is specifically configured to determine that the air path used for charging the external load is the atmospheric air path when the pressure of the air tank is less than the preset pressure; determine that the air path used for charging the external load is the air tank air path when the pressure of the air tank is greater than or equal to the preset pressure and the type of the external load is a preset type; and determine that the air path used for charging the external load is both the air tank air path and the atmospheric air path when the pressure of the air tank is greater than or equal to the preset pressure and the type of the external load is not a preset type.

[0014] Optionally, the controller is further configured to set the speed of the motor according to the type of the external load when inflating the external load, so as to control the inflation speed of the external load by means of the speed of the motor.

[0015] Optionally, the air suspension control system further includes: temperature, pressure, and humidity sensors;

[0016] The controller is also used to open the third reversing valve in the valve body during the process of venting the gas tank, or during the process of charging the external load using the gas tank gas passage, or during the process of charging the external load using the atmospheric gas passage.

[0017] The temperature, pressure and humidity sensor is used to monitor the temperature, humidity and pressure in the gas path when the third reversing valve is opened, and to feed back the monitored temperature, humidity and pressure to the controller.

[0018] The controller is also used to perform a backflushing operation when it is determined that the humidity of the gas is greater than a preset threshold.

[0019] Optionally, the pipe diameter connecting the external load and the load valve and the pipe diameter connecting the load valve and the motor are adapted to the maximum air flow rate of the external load, and the inner wall of the air passage is smooth.

[0020] Optionally, a protective frame is provided on the outside of the valve body, and the protective frame is used to fix the maintenance unit.

[0021] According to a second aspect of this application, an air suspension control method is provided, applied to the air suspension control system described in the first aspect, the method comprising:

[0022] When the high-pressure dryer is being dried and regenerated, the first reversing valve in the valve body is opened to control the air in the air tank to flow sequentially through the first reversing valve, the external explosion-proof pipeline, the flow limiting valve, the high-pressure dryer and the exhaust valve into the atmosphere, without flowing through the internal air passage of the valve body.

[0023] Optionally, the method further includes:

[0024] When inflating an external load, the pressure of the air tank is obtained, and the air path used for inflating the external load is determined according to the pressure of the air tank and the type of the external load. Air is then controlled to enter the external load through the motor and load valve in the air path.

[0025] Optionally, the control air enters the external load via the motor and load valve in the air circuit, including:

[0026] When it is determined that the air path used for charging the external load is the air path of the air storage tank, the second reversing valve in the valve body is opened to control the air in the air storage tank to enter the external load in sequence through the second reversing valve, the motor and the load valve.

[0027] Optionally, the control air enters the external load via the motor and load valve in the air circuit, including:

[0028] When it is determined that the air path used for charging the external load is the atmospheric air path, the air in the atmosphere is controlled to enter the external load in sequence through the low-pressure dryer, the motor and the load valve.

[0029] Optionally, determining the gas path used for charging the external load based on the pressure of the gas storage tank and the type of the external load includes:

[0030] When the pressure in the gas storage tank is less than the preset pressure, the gas path used for charging the external load is determined to be the atmospheric gas path.

[0031] When the pressure of the gas storage tank is greater than or equal to the preset pressure and the type of the external load is the preset type, the gas path used for charging the external load is determined to be the gas storage tank gas path.

[0032] When the pressure of the gas storage tank is greater than or equal to the preset pressure and the type of the external load is not the preset type, the gas path used for charging the external load is determined to be the gas storage tank gas path and the atmospheric gas path.

[0033] Optionally, the method further includes:

[0034] When inflating an external load, the speed of the motor is set according to the type of the external load, so as to control the inflation speed of the external load by means of the speed of the motor.

[0035] Optionally, the method further includes:

[0036] During the process of venting the gas tank, or during the process of charging the external load using the gas tank's gas path, or during the process of charging the external load using the atmospheric gas path, the third reversing valve in the valve body is opened to monitor the temperature, humidity, and pressure in the gas path through temperature, pressure, and humidity sensors; when it is determined that the humidity of the gas is greater than a preset threshold, a backflushing operation is performed.

[0037] The technical solution provided in this application has the following advantages compared with the prior art:

[0038] The air suspension control system has an external maintenance unit located on the valve body. This unit includes an exhaust valve, a high-pressure dryer, and a flow restrictor valve, connected to the valve body via an external explosion-proof pipeline. Because the exhaust valve and high-pressure dryer are independently connected and externally located outside the valve body, the high-humidity gas generated during high-pressure dryer regeneration is directly discharged into the atmosphere via the external explosion-proof pipeline, passing through the flow restrictor valve, high-pressure dryer, and exhaust valve. This completely isolates the gas from the internal valve body air passages, preventing corrosion of internal components and extending component lifespan. Furthermore, the exhaust valve and high-pressure dryer are located outside the valve body, allowing for direct inspection or replacement without disassembling the valve body. This solves the problem of inconvenient component replacement within the valve body in traditional solutions, significantly reducing maintenance and time costs. Attached Figure Description

[0039] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a circuit diagram of the air suspension control system in the embodiments of this application;

[0042] Figure 2 This is a diagram of the drying and regeneration air path of the air suspension control system in this application embodiment;

[0043] Figure 3This is an external load inflation air path diagram for the air suspension control system in an embodiment of this application;

[0044] Figure 4 This is another external load inflation circuit diagram for the air suspension control system in the embodiments of this application;

[0045] Figure 5 This is a flowchart of an air suspension control method in an embodiment of this application. Detailed Implementation

[0046] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0047] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0048] Figure 1 This is a pneumatic circuit diagram of the air suspension control system in an embodiment of this application. The air suspension control system includes: a controller (not shown in the figure), a valve body 101, an air tank 102, a unidirectional flow motor 103, and a maintenance unit 104 disposed outside the valve body 101. The maintenance unit 104 includes: an exhaust valve 1042, a high-pressure dryer 1044, and a flow restrictor valve 1046. The maintenance unit 104 is connected to the valve body 101 via an external explosion-proof pipe. The external explosion-proof pipe interface can be designed with a quick-release structure, maintaining system functionality while considering structural compactness and installation flexibility.

[0049] The flow-limiting valve 1046 can be located outside or inside the high-pressure dryer 1044. Optionally, a protective frame can be installed on the outside of the valve body 101 to secure the maintenance unit 104. A quick-connect fitting can be installed on the connecting pipe between the exhaust valve 1042 and the high-pressure dryer 1044, allowing for quick disassembly and maintenance of the exhaust valve 1042 and the high-pressure dryer 1044. An air storage tank 102 is used to store air.

[0050] The air suspension control system may also include a reversing valve 105, a spring valve 106, a spring 107, and a temperature, pressure, and humidity sensor 108. The reversing valve 105 includes a first reversing valve 1051, a second reversing valve 1052, a third reversing valve 1053, and a fourth reversing valve 1054. The reversing valve 105 and the spring valve 106, located inside the valve body 101, form the main air path control structure, which is completely separated from the external exhaust valve and the regeneration air path of the high-pressure dryer.

[0051] The controller can monitor the dew point in the gas storage tank 102 and determine whether to regenerate the high-pressure dryer 1044 based on the dew point. For example, if the dew point in the gas storage tank 102 is detected to be high, it is considered that the drying efficiency of the high-pressure dryer 1044 is low, and the high-pressure dryer 1044 needs to be regenerated. Figure 2 As shown, the controller, when the high-pressure dryer 1044 is being dried and regenerated, opens the first reversing valve 1051 inside the valve body 101. Through pressure difference, the air in the gas storage tank 102 flows sequentially through the first reversing valve 1051, the external explosion-proof pipeline, the flow-limiting valve 1046, the high-pressure dryer 1044, and the exhaust valve 1042 to the atmosphere, without flowing through the internal gas passages of the valve body 101. This avoids the corrosion of the internal gas passages and components by high-humidity gas, improving component lifespan. Furthermore, the exhaust valve and the high-pressure dryer are located together outside the valve body for easy replacement and maintenance.

[0052] Optionally, the controller is also used to open the third directional valve 1053 in the valve body during the venting process of the gas storage tank 102. When the third directional valve 1053 is open, the air flowing through the first directional valve 1051 can flow through the third directional valve 1053 to the temperature, pressure, and humidity sensor 108. The temperature, pressure, and humidity sensor 108 is used to monitor the temperature, humidity, and pressure in the gas path when the third directional valve 1053 is open, and to feed back the monitored temperature, humidity, and pressure to the controller. In this way, the temperature, humidity, and pressure in the gas path can be monitored in real time during the drying and regeneration process. The controller is used to perform a backflushing operation when it is determined that the humidity of the gas is greater than a preset threshold.

[0053] Optionally, the air suspension control system also includes: a load valve, which is a solenoid valve for inflating an external load. One end of the load valve is connected to the motor 103, and the other end is connected to the external load interface. The load valve is used to provide inflation for external loads (such as tires, seats, etc.) and control the opening and closing of the external air passage. Figure 3 As shown, the air suspension control system also includes a load valve 109, one end of which is connected to the motor 103, and the other end is connected to the external load 110 interface. Optionally, the pipe diameters connecting the external load and the load valve, and the pipe diameters connecting the load valve and the motor, can be adapted to the maximum inflation flow rate of the external load, and the inner wall of the air passage is smooth to reduce gas flow resistance.

[0054] The controller is used to acquire the pressure of the air tank 102 when inflating the external load 110, and determine the air path used for inflating the external load 110 based on the pressure of the air tank 102 and the type of the external load 110, and control the air to enter the external load through the motor and load valve in the air path. In this embodiment, the air source for inflating the external load includes the atmosphere and the air in the air tank 102. The air path used can be selected according to the pressure of the air tank 102 and the type of the external load 110. The air path used can include: a separate atmospheric air path, a separate air tank air path, or a combination of an air tank air path and an atmospheric air path.

[0055] In some embodiments, the controller is specifically configured to determine that the air path used for charging the external load is the atmospheric air path when the pressure of the air tank is less than the preset pressure. That is, when there is little air in the air tank, atmospheric air can be used to charge the external load 110. Otherwise, when the pressure of the air tank is greater than or equal to the preset pressure, the air path used can be further selected based on the type of the external load, that is, different external loads can meet different air supply requirements. For example, when the type of the external load is a preset type, the air path used for charging the external load is determined to be the air tank air path; when the pressure of the air tank is greater than or equal to the preset pressure and the type of the external load is not a preset type, the air path used for charging the external load is determined to be both the air tank air path and the atmospheric air path. For example, the air tank air path can be used first, followed by the atmospheric air path; or, the atmospheric air path can be used first, followed by the air tank air path.

[0056] like Figure 3 As shown, the controller is specifically used to open the second reversing valve 1052 inside the valve body 101 when it is determined that the air path used for charging the external load is the air path of the air storage tank, so as to control the air in the air storage tank 102 to enter the external load 110 in sequence through the second reversing valve 1052, the motor 103, and the load valve 109. The controller is also used to open the third reversing valve 1053 inside the valve body 101 during the process of charging the external load using the air path of the air storage tank. It can be seen that the air flowing through the motor 103 can pass through the high-pressure dryer 1044, the flow limiting valve 1046, and the third reversing valve 1053 to the temperature, pressure, and humidity sensor 108. The temperature, pressure, and humidity sensor 108 is used to monitor the temperature, humidity, and pressure in the air path when the third reversing valve 1053 is open, and to feed back the monitored temperature, humidity, and pressure to the controller. The controller is used to perform a backflushing operation when it is determined that the humidity of the gas is greater than a preset threshold.

[0057] like Figure 4As shown, the air suspension control system also includes a low-pressure dryer 111 located outside the valve body. When the low-pressure dryer 111 is configured to inflate the external load, the risk of corrosion damage to internal metal components due to the high humidity of the atmospheric air supply not being dried during intake can be minimized. Specifically, when the air path used for inflating the external load is determined to be an atmospheric air path, the controller controls the air in the atmosphere to sequentially pass through the low-pressure dryer 111, the motor 103, and the load valve 109 into the external load 110. The controller is also used to open the third reversing valve 1053 inside the valve body during the process of inflating the external load using the atmospheric air path. It can be seen that the air flowing through the motor 103 can pass through the high-pressure dryer 1044, the flow-limiting valve 1046, and the third reversing valve 1053 to the temperature, pressure, and humidity sensor 108. The temperature, pressure, and humidity sensor 108 is used to monitor the temperature, humidity, and pressure in the air path when the third reversing valve 1053 is open, and feeds back the monitored temperature, humidity, and pressure to the controller. The controller is used to perform a backflushing operation when it is determined that the humidity of the gas is greater than a preset threshold.

[0058] Optionally, the controller is also used to set the motor speed according to the type of external load when inflating an external load, so as to control the inflation speed of the external load by controlling the motor speed, thereby matching the inflation speed requirements of different external loads. Temperature, pressure and humidity sensors monitor the parameters in the air circuit in real time. Combined with the operation of the load valve and motor speed control, intelligent dynamic adjustment of the external load inflation process can be realized to ensure that the inflation process is stable and accurate.

[0059] In this embodiment, an external load inflation function is added. Through two air paths and motor speed control, the differentiated inflation volume and speed requirements of multiple vehicle components (such as tires, seats, etc.) can be met, thus expanding the application scenarios of the air suspension system.

[0060] This application also provides an air suspension control method, applied to the aforementioned air suspension control system, see [link to relevant documentation]. Figure 5 This may include the following steps:

[0061] Step S502: When the high-pressure dryer is being dried and regenerated, the first reversing valve in the valve body is opened to control the air in the gas storage tank to flow sequentially through the first reversing valve, the external explosion-proof pipeline, the flow limiting valve, the high-pressure dryer and the exhaust valve to the atmospheric environment, and not to flow through the internal gas path of the valve body.

[0062] Optionally, the above air suspension control method further includes:

[0063] When inflating an external load, the pressure of the air tank is obtained, and the air path used for inflating the external load is determined according to the pressure of the air tank and the type of external load. The air is then controlled to enter the external load through the motor and load valve in the air path.

[0064] Optionally, control air to enter the external load via the motor and load valve in the air circuit, including:

[0065] When it is determined that the air path used for charging the external load is the air path of the air storage tank, the second reversing valve in the valve body is opened to control the air in the air storage tank to enter the external load in sequence through the second reversing valve, the motor and the load valve.

[0066] Optionally, control air to enter the external load via the motor and load valve in the air circuit, including:

[0067] When it is determined that the air path used for charging the external load is the atmospheric air path, the air in the atmosphere is controlled to enter the external load in sequence through the low-pressure dryer, the motor and the load valve.

[0068] Optionally, the gas path used for charging the external load is determined based on the pressure of the gas storage tank and the type of external load, including:

[0069] When the pressure in the gas storage tank is less than the preset pressure, the gas path used for charging the external load is determined to be the atmospheric gas path.

[0070] When the pressure of the gas storage tank is greater than or equal to the preset pressure and the type of the external load is the preset type, the gas path used for charging the external load is determined to be the gas storage tank gas path.

[0071] When the pressure of the gas storage tank is greater than or equal to the preset pressure and the type of the external load is not the preset type, the gas path used for charging the external load is determined to be the gas storage tank gas path and the atmospheric gas path.

[0072] Optionally, the above air suspension control method further includes:

[0073] When inflating an external load, the motor speed is set according to the type of external load, so as to control the inflation speed of the external load by controlling the motor speed.

[0074] Optionally, the above air suspension control method further includes:

[0075] During the process of venting the gas tank, or during the process of using the gas tank's gas path to charge an external load, or during the process of using the atmospheric gas path to charge an external load, the third reversing valve in the valve body is opened to monitor the temperature, humidity, and pressure in the gas path through temperature, pressure, and humidity sensors. When it is determined that the humidity of the gas is greater than a preset threshold, a backflushing operation is performed.

[0076] The specific details of each step in the above method have been described in detail in the corresponding system, so they will not be repeated here.

[0077] This application also provides an electronic device, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute the above-described air suspension control method.

[0078] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described air suspension control method.

[0079] It should be noted that the computer-readable storage medium shown in this application can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory, read-only memory, erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this application, the computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer-readable storage medium can be transmitted using any suitable medium, including but not limited to: wireless, wire, optical fiber, radio frequency, etc., or any suitable combination thereof.

[0080] In this embodiment of the application, a computer program product is also provided, which, when run on a computer, causes the computer to execute the above-described air suspension control method.

[0081] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0082] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air suspension control system characterized by comprising: include: The system includes a controller, a valve body, an air tank, a unidirectional flow motor, and a maintenance unit located outside the valve body. The maintenance unit includes an exhaust valve, a high-pressure dryer, and a flow-limiting valve. The maintenance unit is connected to the valve body via an external explosion-proof pipe. The gas storage tank is used to store air; The controller is used to open the first reversing valve in the valve body when the high-pressure dryer is being dried and regenerated, so as to control the air in the air tank to flow into the atmosphere in sequence through the first reversing valve, the external explosion-proof pipe, the flow limiting valve, the high-pressure dryer and the exhaust valve, and not to flow through the internal air passage of the valve body; The air suspension control system further includes: a load valve; one end of the load valve is connected to the motor, and the other end is connected to an external load interface; The controller is used to acquire the pressure of the air tank when inflating the external load, and determine the air path used for inflating the external load according to the pressure of the air tank and the type of the external load, and control the air to enter the external load through the motor and load valve in the air path. Specifically, the controller is used to open the second reversing valve in the valve body when it is determined that the air path used for charging the external load is the air path of the air storage tank, so as to control the air in the air storage tank to enter the external load in sequence through the second reversing valve, the motor and the load valve; The controller is specifically configured to determine the air path used for charging the external load as the atmospheric air path when the pressure of the air tank is less than the preset pressure; determine the air path used for charging the external load as the air tank air path when the pressure of the air tank is greater than or equal to the preset pressure and the type of the external load is a preset type; and determine the air path used for charging the external load as both the air tank air path and the atmospheric air path when the pressure of the air tank is greater than or equal to the preset pressure and the type of the external load is not a preset type.

2. The air suspension control system of claim 1, wherein The air suspension control system also includes a low-pressure dryer disposed outside the valve body; The controller is specifically used to control air from the atmosphere to enter the external load sequentially through the low-pressure dryer, the motor, and the load valve when it is determined that the air path used for charging the external load is an atmospheric air path.

3. The air suspension control system of claim 1, wherein The controller is also configured to set the speed of the motor according to the type of the external load when inflating the external load, so as to control the inflation speed of the external load by means of the speed of the motor.

4. The air suspension control system of claim 1, wherein The air suspension control system also includes: temperature, pressure, and humidity sensors; The controller is also used to open the third reversing valve in the valve body during the process of venting the gas tank, or during the process of charging the external load using the gas tank gas passage, or during the process of charging the external load using the atmospheric gas passage. The temperature, pressure and humidity sensor is used to monitor the temperature, humidity and pressure in the gas path when the third reversing valve is opened, and to feed back the monitored temperature, humidity and pressure to the controller. The controller is also used to perform a backflushing operation when it is determined that the humidity of the gas is greater than a preset threshold.

5. The air suspension control system of claim 1, wherein The pipe diameters connecting the external load and the load valve, and the pipe diameters connecting the load valve and the motor, are designed to be adapted to the maximum air flow rate of the external load, and the inner wall of the air passage is smooth.

6. The air suspension control system of claim 1, wherein A protective frame is provided on the outside of the valve body, and the protective frame is used to fix the maintenance unit.

7. An air suspension control method characterized by, The method, applied to the air suspension control system according to any one of claims 1 to 6, comprises: When the high-pressure dryer is being dried and regenerated, the first reversing valve in the valve body is opened to control the air in the gas storage tank to flow into the atmosphere in sequence through the first reversing valve, the external explosion-proof pipeline, the flow limiting valve, the high-pressure dryer and the exhaust valve, and not through the internal gas path of the valve body. When inflating an external load, the pressure of the air tank is obtained, and the air path used for inflating the external load is determined according to the pressure of the air tank and the type of the external load. The air is then controlled to enter the external load through the motor and load valve in the air path. When it is determined that the air path used for charging the external load is the air path of the air storage tank, the second reversing valve in the valve body is opened to control the air in the air storage tank to enter the external load in sequence through the second reversing valve, the motor and the load valve; When the pressure of the gas tank is less than the preset pressure, the gas path used for charging the external load is determined to be the atmospheric gas path; when the pressure of the gas tank is greater than or equal to the preset pressure and the type of the external load is the preset type, the gas path used for charging the external load is determined to be the gas tank gas path; when the pressure of the gas tank is greater than or equal to the preset pressure and the type of the external load is not the preset type, the gas path used for charging the external load is determined to be both the gas tank gas path and the atmospheric gas path.

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