Air suspension control system and control method thereof

Abstract

The application discloses an air suspension control system and a control method thereof. The air suspension control system comprises a compressor assembly, an air filter dryer, a one-way valve, an exhaust valve, a first switching valve, a second switching valve, a third switching valve, a fourth switching valve, a fifth switching valve, a first air valve, a second air valve, a third air valve, a fourth air valve, a pressure temperature sensor, a high-pressure gas storage tank and a low-pressure gas storage tank. The air filter dryer is arranged at the front end of an air path, and air entering the system is filtered and dried in advance, so that the influence of water and impurities in the air on the air suspension system can be effectively prevented, the performance of the air suspension system is improved, the air in the application can be recycled in the system through the design of the air path, the air does not need to be frequently sucked from the atmosphere, energy consumption can be reduced, the environment is protected, the working load of the compressor is reduced, and the working efficiency and service life of the compressor are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air suspension, in particular to an air suspension control system and a control method thereof. BACKGROUND

[0002] The automobile suspension system is an important part of the automobile, and its main function is to transmit the force and torque between the wheels and the frame, and to buffer the impact force from the uneven road to the frame or the body, and to attenuate the vibration caused thereby, so as to ensure the smooth driving of the automobile and improve the driving stability and comfort of the vehicle. The air suspension is widely used in various vehicles due to its excellent performance, such as adjustable stiffness and adjustable damping. However, the working medium of the air suspension system is air, which contains water and impurities, but the air suspension control system in the prior art does not perform drying treatment when the air enters, which will affect the performance of the air suspension system, such as corrosion, freezing, etc. At the same time, the gas in the air suspension control system in the prior art is used only once and cannot be recycled inside the system, which needs to frequently suck air from the atmosphere, not only increasing the energy consumption, but also causing certain impact on the environment. In addition, the air suspension control system in the prior art has a certain noise, and the compressor has a relatively short service life. SUMMARY

[0003] The present application provides an air suspension control system and a control method thereof to overcome at least one technical problem in the prior art.

[0004] The specific technical solutions are as follows:

[0005] In a first aspect, the present application provides an air suspension control system and a control method thereof, the air suspension control system comprising: a compressor assembly, an air filter dryer, a one-way valve, an exhaust valve, a first switching valve, a second switching valve, a third switching valve, a fourth switching valve, a fifth switching valve, a first air valve, a second air valve, a third air valve, a fourth air valve, a pressure temperature sensor, a high-pressure gas storage tank and a low-pressure gas storage tank,

[0006] The air outlet end of the air filter dryer is connected with the air inlet end of the one-way valve, the air outlet end of the one-way valve is connected with the air inlet end of the compressor assembly, the air outlet end of the compressor assembly, the first valve port of the exhaust valve, the first valve port of the first switch valve, and the first valve port of the fourth switch valve are connected with each other, respectively, the second valve port of the exhaust valve is connected with the air outlet end of the air filter dryer, the second valve port of the first switch valve and the first valve port of the second switch valve are connected with the high-pressure gas tank, respectively, the first valve port of the first air valve is connected with the front left air spring, the first valve port of the second air valve is connected with the front right air spring, the first valve port of the third air valve is connected with the rear left air spring, the first valve port of the fourth air valve is connected with the rear right air spring, the second valve port of the first air valve, the second valve port of the second air valve, the second valve port of the third air valve, and the second valve port of the fourth air valve are connected with the second valve port of the fourth switch valve, respectively, and the second valve port of the first air valve, the second valve port of the second air valve, the second valve port of the third air valve, and the second valve port of the fourth air valve are connected with the first valve port of the third switch valve, respectively, the pressure and temperature sensor is arranged on the gas path connected with each other among the third switch valve, the fourth switch valve, the first air valve, the second air valve, the third air valve, and the fourth air valve, the first valve port of the fifth switch valve is connected with the low-pressure gas tank, and the second valve port of the second switch valve, the second valve port of the third switch valve, the second valve port of the fifth switch valve, and the air inlet end of the compressor assembly are connected with each other, respectively.

[0007] In some embodiments of the present application, the air suspension control system further comprises a pressure limiting valve, and the air outlet end of the compressor assembly is connected with the air inlet end of the one-way valve and the air outlet end of the one-way valve through the pressure limiting valve, respectively.

[0008] In some embodiments of the present application, the exhaust valve, the first switch valve, the second switch valve, the third switch valve, the fourth switch valve, the fifth switch valve, the first air valve, the second air valve, the third air valve, and the fourth air valve are all two-position two-way electromagnetic valves.

[0009] In some embodiments of the present application, the preset pressure value of the high-pressure gas tank is 1.4 MPa, and the preset pressure value of the low-pressure gas tank is 0.5 MPa.

[0010] In a second aspect, the embodiments of the present application provide an air suspension control method applied to the air suspension control system in the first aspect, and the air suspension control method comprises the following steps.

[0011] When the front left axle is raised, the front left air spring is supplied with air, the second switch valve and the fourth switch valve are opened at the same time, the compressor assembly is opened after a first preset time, the first air valve is opened after a second preset time, until the front left axle is raised to a preset height, the first air valve is closed, the compressor assembly is closed after a third preset time, the second switch valve and the fourth switch valve are closed at the same time after a fourth preset time;

[0012] When the front right axle is raised, the front right air spring is supplied with air, the second switch valve and the fourth switch valve are opened at the same time, the compressor assembly is opened after the first preset time, the second air valve is opened after the second preset time, until the front right axle is raised to a preset height, the second air valve is closed, the compressor assembly is closed after the third preset time, the second switch valve and the fourth switch valve are closed at the same time after the fourth preset time;

[0013] When the rear left axle is raised, the rear left air spring is supplied with air, the second switch valve and the fourth switch valve are opened at the same time, the compressor assembly is opened after the first preset time, the third air valve is opened after the second preset time, until the rear left axle is raised to a preset height, the third air valve is closed, the compressor assembly is closed after the third preset time, the second switch valve and the fourth switch valve are closed at the same time after the fourth preset time;

[0014] When the rear right axle is raised, the rear right air spring is supplied with air, the second switch valve and the fourth switch valve are opened at the same time, the compressor assembly is opened after the first preset time, the fourth air valve is opened after the second preset time, until the rear right axle is raised to a preset height, the fourth air valve is closed, the compressor assembly is closed after the third preset time, the second switch valve and the fourth switch valve are closed at the same time after the fourth preset time;

[0015] When the front left axle is lowered, the front left air spring is exhausted, the third switch valve and the fifth switch valve are opened at the same time, the first air valve is opened after a fifth preset time, the low-pressure gas tank collects the gas exhausted by the front left air spring, if the pressure value of the low-pressure gas tank reaches a preset pressure value, the fifth switch valve and the first air valve are closed, the first switch valve is opened at the same time, the compressor assembly is opened after a sixth preset time, the first air valve is opened after the fifth preset time, the high-pressure gas tank collects the gas exhausted by the front left air spring, until the front left axle is lowered to a preset height, the first air valve is closed, the compressor assembly is closed after a seventh preset time, the first switch valve and the third switch valve are closed after an eighth preset time;

[0016] When the front right axle is descending, the front right air spring is exhausting, the third switch valve and the fifth switch valve are opened at the same time, the second air valve is opened after the fifth preset time, the low-pressure gas tank collects the gas exhausted by the front right air spring, if the pressure value of the low-pressure gas tank reaches the preset pressure value, the fifth switch valve and the second air valve are closed, the first switch valve is opened at the same time, the compressor assembly is opened after the sixth preset time, the second air valve is opened after the fifth preset time, the high-pressure gas tank collects the gas exhausted by the front right air spring, until the front right axle descends to the preset height, the second air valve is closed, the compressor assembly is closed after the seventh preset time, the first switch valve and the third switch valve are closed after the eighth preset time.

[0017] When the rear left axle is descending, the rear left air spring is exhausting, the third switch valve and the fifth switch valve are opened at the same time, the third air valve is opened after the fifth preset time, the low-pressure gas tank collects the gas exhausted by the rear left air spring, if the pressure value of the low-pressure gas tank reaches the preset pressure value, the fifth switch valve and the third air valve are closed, the first switch valve is opened at the same time, the compressor assembly is opened after the sixth preset time, the third air valve is opened after the fifth preset time, the high-pressure gas tank collects the gas exhausted by the rear left air spring, until the rear left axle descends to the preset height, the third air valve is closed, the compressor assembly is closed after the seventh preset time, the first switch valve and the third switch valve are closed after the eighth preset time.

[0018] When the rear right axle is descending, the rear right air spring is exhausting, the third switch valve and the fifth switch valve are opened at the same time, the fourth air valve is opened after the fifth preset time, the low-pressure gas tank collects the gas exhausted by the rear right air spring, if the pressure value of the low-pressure gas tank reaches the preset pressure value, the fifth switch valve and the fourth air valve are closed, the first switch valve is opened at the same time, the compressor assembly is opened after the sixth preset time, the fourth air valve is opened after the fifth preset time, the high-pressure gas tank collects the gas exhausted by the rear right air spring, until the rear right axle descends to the preset height, the fourth air valve is closed, the compressor assembly is closed after the seventh preset time, the first switch valve and the third switch valve are closed after the eighth preset time.

[0019] In some embodiments of the present application, the air suspension control method further comprises:

[0020] When the high-pressure gas tank is filled with air, the first switch valve and the fourth switch valve are opened at the same time, the compressor assembly is opened after a delay of the ninth preset time, the external air is filtered and dried by the air filter dryer, and then is delivered to the high-pressure gas tank after being pressurized by the compressor assembly, until the pressure value of the high-pressure gas tank reaches a preset pressure value, the compressor assembly is closed, and the first switch valve and the fourth switch valve are closed at the same time after a delay of the tenth preset time.

[0021] In some embodiments of the present application, the air suspension control method further comprises:

[0022] When the front left axle is lowered and the front left air spring is exhausted, the first air valve and the third switch valve are opened at the same time, the exhaust valve is opened after a delay of the eleventh preset time, the gas in the front left air spring is exhausted to the atmosphere, until the front left axle is lowered to a preset height, the exhaust valve is closed, and the first air valve and the third switch valve are closed at the same time after a delay of the twelfth preset time.

[0023] When the front right axle is lowered and the front right air spring is exhausted, the second air valve and the third switch valve are opened at the same time, the exhaust valve is opened after a delay of the eleventh preset time, the gas in the front right air spring is exhausted to the atmosphere, until the front right axle is lowered to a preset height, the exhaust valve is closed, and the second air valve and the third switch valve are closed at the same time after a delay of the twelfth preset time.

[0024] When the rear left axle is lowered and the rear left air spring is exhausted, the third air valve and the third switch valve are opened at the same time, the exhaust valve is opened after a delay of the eleventh preset time, the gas in the rear left air spring is exhausted to the atmosphere, until the rear left axle is lowered to a preset height, the exhaust valve is closed, and the third air valve and the third switch valve are closed at the same time after a delay of the twelfth preset time.

[0025] When the rear right axle is lowered and the rear right air spring is exhausted, the fourth air valve and the third switch valve are opened at the same time, the exhaust valve is opened after a delay of the eleventh preset time, the gas in the rear right air spring is exhausted to the atmosphere, until the rear right axle is lowered to a preset height, the exhaust valve is closed, and the fourth air valve and the third switch valve are closed at the same time after a delay of the twelfth preset time.

[0026] In some embodiments of the present application, the air suspension control method further comprises:

[0027] When the high-pressure gas tank is filled with gas, the first switch valve, the fourth switch valve and the fifth switch valve are opened at the same time, the compressor assembly is opened after a delay of the thirteenth preset time, the gas in the low-pressure gas tank is delivered into the high-pressure gas tank until the pressure value of the high-pressure gas tank reaches a preset pressure value, the compressor assembly is closed, and the first switch valve, the fourth switch valve and the fifth switch valve are closed at the same time after a delay of the fourteenth preset time.

[0028] In some embodiments of the present application, the air suspension control method further comprises:

[0029] When the pressure value of the front left air spring is measured, the first air valve is opened, and the pressure temperature sensor is used for monitoring;

[0030] When the pressure value of the front right air spring is measured, the second air valve is opened, and the pressure temperature sensor is used for monitoring;

[0031] When the pressure value of the rear left air spring is measured, the third air valve is opened, and the pressure temperature sensor is used for monitoring;

[0032] When the pressure value of the rear right air spring is measured, the fourth air valve is opened, and the pressure temperature sensor is used for monitoring;

[0033] When the pressure value of the high-pressure gas tank is measured, the first switch valve, the second switch valve and the fourth switch valve are opened at the same time, and the pressure temperature sensor is used for monitoring.

[0034] In some embodiments of the present application, the air suspension control method further comprises:

[0035] When the desiccant in the air filter dryer is regenerated, the first switch valve and the fourth switch valve are opened at the same time, the exhaust valve is opened after a delay of the fifteenth preset time, the gas in the high-pressure gas tank flows through the desiccant in the air filter dryer and is discharged to the atmosphere, the exhaust valve is closed after a preset regeneration time, and the first switch valve and the fourth switch valve are closed at the same time after a delay of the sixteenth preset time.

[0036] The beneficial effects of the embodiments of the present application are as follows:

[0037] The air filter dryer is arranged at the front end of the gas path, and the gas entering the system is subjected to filtering and drying treatment in advance, so that the influence of water and impurities in the air on the air suspension system, such as corrosion and freezing, can be effectively prevented, thereby improving the performance and service life of the air suspension system, and through the design of the gas path, the gas in the application can be circulated in the system, without frequent air suction from the atmosphere, reducing energy consumption, and being beneficial to environmental protection, and the dry gas is basically circulated in the system, which can reduce the working load of the compressor and the air filter dryer, effectively improve the working efficiency of the compressor and the service life of the air filter dryer. In addition, through the control of the valve opening sequence and delay time of each valve body and the compressor, the blow-by problem of the gas flow in the system can be effectively reduced, thereby realizing the improvement of NVH, that is, the improvement of noise, vibration and acoustic comfort, and further improving the comfort of the whole vehicle and vehicle driving. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0039] Figure 1 A structural schematic diagram of an air suspension control system provided by an embodiment of the present application is shown in the figure.

[0040] Figure 2 A working mode schematic diagram of the front left axle lifting of an air suspension control method provided by an embodiment of the present application is shown in the figure.

[0041] Figure 3 A working mode schematic diagram of the front left axle descending and exhausting to the low-pressure gas storage tank of an air suspension control method provided by an embodiment of the present application is shown in the figure.

[0042] Figure 4 A working mode schematic diagram of the front left axle descending and exhausting to the high-pressure gas storage tank of an air suspension control method provided by an embodiment of the present application is shown in the figure.

[0043] Figure 5 A working mode schematic diagram of the front axle pressure balance of an air suspension control method provided by an embodiment of the present application is shown in the figure.

[0044] Figure 6 A working mode schematic diagram of the high-pressure gas storage tank pressure test of an air suspension control method provided by an embodiment of the present application is shown in the figure.

[0045] Figure 7This is a schematic diagram of the working mode of filling an air tank with external air in an air suspension control method provided in an embodiment of this application;

[0046] Figure 8 This is a schematic diagram illustrating the working mode of the front axle air spring being filled with external air in an air suspension control method provided in this application embodiment;

[0047] Figure 9 This is a schematic diagram of the working mode of desiccant regeneration in an air suspension control method provided in an embodiment of this application;

[0048] Figure 10 This is a schematic diagram illustrating the working mode of the front axle air spring exhausting into the atmosphere in an air suspension control method provided in this application embodiment;

[0049] Figure 11 A schematic diagram of the working mode of the high-pressure air tank venting to the atmosphere in an air suspension control method provided in this application embodiment;

[0050] Figure 12 This is a schematic diagram illustrating the working mode of a high-pressure air tank being filled with gas from a low-pressure air tank in an air suspension control method provided in this application embodiment. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The terms "comprising" and "having," and any variations thereof, in the embodiments and drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0053] This application discloses an air suspension control system. Detailed descriptions follow.

[0054] Figure 1 An air suspension control system according to an embodiment of this application is shown. Figure 1As shown, the air suspension control system mainly includes: a compressor assembly CM, an air filter / dryer AF+AD, a check valve CV1, an exhaust valve EV, a first switching valve SV1, a second switching valve SV2, a third switching valve SV3, a fourth switching valve SV4, a fifth switching valve SV5, a first air valve AV1, a second air valve AV2, a third air valve AV3, a fourth air valve AV4, a pressure / temperature sensor P / T, a high-pressure air reservoir RES H, and a low-pressure air reservoir RES L.

[0055] Specifically, the air outlet end of the air filter and dryer AF+AD is connected with the air inlet end of the check valve CV1, the air outlet end of the check valve CV1 is connected with the air inlet end of the compressor assembly CM, the air outlet end of the compressor assembly CM, the first valve port of the exhaust valve EV, the first valve port of the first switch valve SV1, the first valve port of the fourth switch valve SV4 are connected with each other, the second valve port of the exhaust valve EV is connected with the air outlet end of the air filter and dryer AF+AD, the second valve port of the first switch valve SV1 and the first valve port of the second switch valve SV2 are connected with the high-pressure gas storage tank RES_H, the first valve port of the first air valve AV1 is connected with the front left air spring FL, the first valve port of the second air valve AV2 is connected with the front right air spring FR, the first valve port of the third air valve AV3 is connected with the rear left air spring RL, the first valve port of the fourth air valve AV4 is connected with the rear right air spring RR, the second valve port of the first air valve AV1, the second valve port of the second air valve AV2, the second valve port of the third air valve AV3, the second valve port of the fourth air valve AV4 are connected with the second valve port of the fourth switch valve SV4, and the second valve port of the first air valve AV1, the second valve port of the second air valve AV2, the second valve port of the third air valve AV3, the second valve port of the fourth air valve AV4 are connected with the first valve port of the third switch valve SV3, the pressure and temperature sensor P / T is arranged on the gas circuit connected with the third switch valve SV3, the fourth switch valve SV4, the first air valve AV1, the second air valve AV2, the third air valve AV3 and the fourth air valve AV4, the first valve port of the fifth switch valve SV5 is connected with the low-pressure gas storage tank RES_L, the second valve port of the second switch valve SV2, the second valve port of the third switch valve SV3, the second valve port of the fifth switch valve SV5 and the air inlet end of the compressor assembly CM are connected with each other. The gas circuit design of the air suspension control system is one of the innovations of the present application, the air filter and dryer AF+AD with air filtering and drying functions is arranged at the air inlet end of the compressor assembly CM, the gas is first filtered and then dried, so that the gas entering the system is first filtered and dried, which can effectively remove the moisture and impurities in the air, thereby avoiding the influence of the moisture and impurities in the air on the air suspension system, solving the corrosion and freezing problems caused by the gas entering without drying treatment in the prior art, at the same time, the gas circuit design makes the dried gas basically circulate within the system, without the need to frequently suck air from the atmosphere, thereby reducing energy consumption and the impact on the environment, in addition, the low-pressure gas storage tank RES_L in the present application directly collects the gas discharged by the air spring, when the pressure value of the low-pressure gas storage tank RES_L reaches the preset pressure value, the compressor assembly CM and the corresponding valve body are opened, the gas discharged by the air spring is collected through the high-pressure gas storage tank RES_H, which can greatly improve the lifting efficiency of the air suspension.

[0056] Furthermore, the air suspension control system also includes a pressure relief valve PLV. The outlet of the compressor assembly CM is connected to the inlet and outlet of the one-way valve CV1 through the pressure relief valve PLV. The pressure relief valve PLV is used to ensure the overall safety of the air suspension control system.

[0057] In the specific implementation process, the exhaust valve EV, the first switching valve SV1, the second switching valve SV2, the third switching valve SV3, the fourth switching valve SV4, the fifth switching valve SV5, the first air valve AV1, the second air valve AV2, the third air valve AV3, and the fourth air valve AV4 are all two-position two-way solenoid valves. Furthermore, the preset pressure value of the high-pressure air tank RES_H is 1.4 MPa, and the preset pressure value of the low-pressure air tank RES_L is 0.5 MPa. The high-pressure air tank RES_H directly charges the air spring, while the low-pressure air tank RES_L directly collects the gas discharged from the air spring.

[0058] This application also discloses an air suspension control method, which is applied to the air suspension control system in the above-described air suspension control system embodiments. For details regarding the air suspension control system, please refer to the above-described air suspension control system embodiments, which will not be repeated here. The air suspension control method includes the following operating modes:

[0059] (1) Air suspension lift mode

[0060] like Figure 2 As shown, when the front left axle is raised and air is supplied to the front left air spring FL, firstly, the second switching valve SV2 and the fourth switching valve SV4 are opened simultaneously. After a first preset time delay, the compressor assembly CM is opened. After a second preset time delay, the first air valve AV1 is opened. Through the opening of the second switching valve SV2, the fourth switching valve SV4, and the first air valve AV1, the air passage between the high-pressure air tank RES_H and the front left air spring FL is opened, allowing the gas in the high-pressure air tank RES_H to directly fill the front left air spring FL, thereby raising the front left axle. By controlling the opening sequence and delay time of the second switching valve SV2, the fourth switching valve SV4, the compressor assembly CM, and the first air valve AV1, the problem of air leakage within the system is reduced, improving the overall vehicle comfort. After the front left axle is raised to the preset height, firstly, the first air valve AV1 is closed. After a third preset time delay, the compressor assembly CM is closed. After a fourth preset time delay, the second switching valve SV2 and the fourth switching valve SV4 are closed simultaneously.

[0061] Similarly, when the front right axle is raised, the front right air spring FR is supplied with air, first, the second switching valve SV2 and the fourth switching valve SV4 are opened at the same time, after a delay of the first preset time, the compressor assembly CM is opened, after a delay of the second preset time, the second air valve AV2 is opened again, so that the gas in the high-pressure gas tank RES H is directly charged into the front right air spring FR, and then the front right axle is raised. After the front right axle is raised to the preset height, first, the second air valve AV2 is closed, after a delay of the third preset time, the compressor assembly CM is closed, after a delay of the fourth preset time, the second switching valve SV2 and the fourth switching valve SV4 are closed at the same time.

[0062] When the rear left axle is raised, the rear left air spring RL is supplied with air, first, the second switching valve SV2 and the fourth switching valve SV4 are opened at the same time, after a delay of the first preset time, the compressor assembly CM is opened, after a delay of the second preset time, the third air valve AV3 is opened again, so that the gas in the high-pressure gas tank RES H is directly charged into the rear left air spring RL, and then the rear left axle is raised. After the rear left axle is raised to the preset height, the third air valve AV3 is closed, after a delay of the third preset time, the compressor assembly CM is closed, after a delay of the fourth preset time, the second switching valve SV2 and the fourth switching valve SV4 are closed at the same time.

[0063] When the rear right axle is raised, the rear right air spring RR is supplied with air, first, the second switching valve SV2 and the fourth switching valve SV4 are opened at the same time, after a delay of the first preset time, the compressor assembly CM is opened, after a delay of the second preset time, the fourth air valve AV4 is opened again, so that the gas in the high-pressure gas tank RES H is directly charged into the rear right air spring RR, and then the rear right axle is raised. After the rear right axle is raised to the preset height, the fourth air valve AV4 is closed, after a delay of the third preset time, the compressor assembly CM is closed, after a delay of the fourth preset time, the second switching valve SV2 and the fourth switching valve SV4 are closed at the same time.

[0064] In addition, when the front axle is raised, the front right air spring FR and the rear left air spring RL are supplied with air at the same time. Specifically, first, the second switching valve SV2 and the fourth switching valve SV4 are opened at the same time, after a delay of the first preset time, the compressor assembly CM is opened, after a delay of the second preset time, the first air valve AV1 and the second air valve AV2 are opened again, so that the gas in the high-pressure gas tank RES H is directly charged into the front right air spring FR and the front right air spring FR, and then the front axle is raised. After the front axle is raised to the preset height, first, the first air valve AV1 and the second air valve AV2 are closed, after a delay of the third preset time, the compressor assembly CM is closed, after a delay of the fourth preset time, the second switching valve SV2 and the fourth switching valve SV4 are closed at the same time.

[0065] Similarly, when the rear axle is raised, air is supplied to both the rear left air spring RL and the rear right air spring RR simultaneously. Specifically, first, the second switching valve SV2 and the fourth switching valve SV4 are opened simultaneously. After a first preset time delay, the compressor assembly CM is opened. After a second preset time delay, the third air valve AV3 and the fourth air valve AV4 are opened, allowing the gas in the high-pressure air tank RES_H to directly fill the rear left air spring RL and the rear right air spring RR, thereby raising the rear axle. After the rear axle is raised to the preset height, the third air valve AV3 and the fourth air valve AV4 are closed. After a third preset time delay, the compressor assembly CM is closed. After a fourth preset time delay, the second switching valve SV2 and the fourth switching valve SV4 are closed simultaneously.

[0066] (2) Air suspension descent mode

[0067] like Figure 3 As shown, when the left axle descends and the front left air spring FL exhausts gas, firstly, the third switching valve SV3 and the fifth switching valve SV5 are opened simultaneously. After a five-preset delay, the first air valve AV1 is opened, and the low-pressure air tank RES_L collects the gas exhausted by the front left air spring FL. Since the air pressure in the front left air spring FL is greater than the air pressure in the low-pressure air tank RES_L, the gas in the front left air spring FL can be quickly exhausted into the low-pressure air tank RES_L, greatly improving the descent efficiency of the air suspension. If the air pressure in the low-pressure air tank RES_L has not reached its preset pressure value before the front left axle has descended to the preset height, then the first air valve AV1 is closed first. After a seventeen-preset delay, the third switching valve SV3 and the fifth switching valve SV5 are closed simultaneously. If the air pressure in the low-pressure air tank RES_L reaches its preset pressure value, but the front left shaft has not yet descended to the preset height, then the fifth switching valve SV5 and the first air valve AV1 are closed, while the first switching valve SV1 is opened simultaneously. After a sixth preset time delay, the compressor assembly CM is started. After a fifth preset time delay, the first air valve AV1 is opened again. Figure 4 As shown, replace the high-pressure air tank RES_H to collect the gas discharged from the front left air spring FL until the front left shaft drops to the preset height, close the first air valve AV1, and after a seventh preset time delay, close the compressor assembly CM. After an eighth preset time delay, close the first switching valve SV1 and the third switching valve SV3.

[0068] Similarly, when the front right axle is lowered, the front right air spring FR is vented, first, the third switch valve SV3 and the fifth switch valve SV5 are opened simultaneously, after a delay of the fifth preset time, the second air valve AV2 is opened, and the low-pressure gas tank RES L collects the gas discharged by the front right air spring FR. If the pressure value of the low-pressure gas tank RES L does not reach its preset pressure value, the front right axle has already been lowered to the preset height, then first close the second air valve AV2, after a delay of the seventeenth preset time, then close the third switch valve SV3 and the fifth switch valve SV5 simultaneously. If the pressure value of the low-pressure gas tank RES L reaches its preset pressure value, the front right axle has not yet been lowered to the preset height, then close the fifth switch valve SV5 and the second air valve AV2, open the first switch valve SV1 at the same time, after a delay of the sixth preset time, open the compressor assembly CM, after a delay of the fifth preset time, open the second air valve AV2 again, and the high-pressure gas tank RES H collects the gas discharged by the front right air spring FR, until the front right axle is lowered to the preset height, close the second air valve AV2, after a delay of the seventh preset time, close the compressor assembly CM, and after a delay of the eighth preset time, close the first switch valve SV1 and the third switch valve SV3.

[0069] When the rear left axle is lowered, the rear left air spring RL is vented, first, the third switch valve SV3 and the fifth switch valve SV5 are opened simultaneously, after a delay of the fifth preset time, the third air valve AV3 is opened, and the low-pressure gas tank RES L collects the gas discharged by the rear left air spring RL. If the pressure value of the low-pressure gas tank RES L does not reach its preset pressure value, the rear left axle has already been lowered to the preset height, then first close the third air valve AV3, after a delay of the seventeenth preset time, then close the third switch valve SV3 and the fifth switch valve SV5 simultaneously. If the pressure value of the low-pressure gas tank RES L reaches its preset pressure value, the rear left axle has not yet been lowered to the preset height, then close the fifth switch valve SV5 and the third air valve AV3, open the first switch valve SV1 at the same time, after a delay of the sixth preset time, open the compressor assembly CM, after a delay of the fifth preset time, open the third air valve AV3 again, and the high-pressure gas tank RES H collects the gas discharged by the rear left air spring RL, until the rear left axle is lowered to the preset height, close the third air valve AV3, after a delay of the seventh preset time, close the compressor assembly CM, and after a delay of the eighth preset time, close the first switch valve SV1 and the third switch valve SV3.

[0070] When the rear right axle is descending, the rear right air spring RR is venting, first, the third switch valve SV3 and the fifth switch valve SV5 are opened at the same time, after a delay of the fifth preset time, the fourth air valve AV4 is opened, the low pressure gas tank RES L collects the gas vented by the rear right air spring RR. If the pressure value of the low pressure gas tank RES L does not reach its preset pressure value, the rear right axle has already descended to the preset height, then first the fourth air valve AV4 is closed, after a delay of the seventeenth preset time, the third switch valve SV3 and the fifth switch valve SV5 are closed at the same time. If the pressure value of the low pressure gas tank RES L reaches its preset pressure value, the rear right axle has not yet descended to the preset height, then the fifth switch valve SV5 and the fourth air valve AV4 are closed, the first switch valve SV1 is opened at the same time, after a delay of the sixth preset time, the compressor assembly CM is opened, after a delay of the fifth preset time, the fourth air valve AV4 is opened again, the high pressure gas tank RES H collects the gas vented by the rear right air spring RR, until the rear right axle descends to the preset height, the fourth air valve AV4 is closed, after a delay of the seventh preset time, the compressor assembly CM is closed, after a delay of the eighth preset time, the first switch valve SV1 and the third switch valve SV3 are closed again.

[0071] In addition, according to specific working conditions, the exhaust of the air spring can be directly collected into the high-pressure gas tank RES H. In detail, when the front left axle is lowered, first, the first switch valve SV1 and the third switch valve SV3 are opened at the same time, the compressor assembly CM is opened after a delay of the eighteenth preset time, the first air valve AV1 is opened again after a delay of the nineteenth preset time, the high-pressure gas tank RES H collects the gas discharged by the front left air spring FL, when the front left axle is lowered to a preset height, the first air valve AV1 is closed, after a delay of the twentieth preset time, the compressor assembly CM is closed, and after a delay of the twenty-first preset time, the first switch valve SV1 and the third switch valve SV3 are closed again. When the front right axle is lowered, first, the first switch valve SV1 and the third switch valve SV3 are opened at the same time, the compressor assembly CM is opened after a delay of the eighteenth preset time, the second air valve AV2 is opened again after a delay of the nineteenth preset time, the high-pressure gas tank RES H collects the gas discharged by the front right air spring FR, when the front right axle is lowered to a preset height, the second air valve AV2 is closed, after a delay of the twentieth preset time, the compressor assembly CM is closed, and after a delay of the twenty-first preset time, the first switch valve SV1 and the third switch valve SV3 are closed again. When the rear left axle is lowered, first, the first switch valve SV1 and the third switch valve SV3 are opened at the same time, the compressor assembly CM is opened after a delay of the eighteenth preset time, the third air valve AV3 is opened again after a delay of the nineteenth preset time, the high-pressure gas tank RES H collects the gas discharged by the rear left air spring RL, when the rear left axle is lowered to a preset height, the third air valve AV3 is closed, after a delay of the twentieth preset time, the compressor assembly CM is closed, and after a delay of the twenty-first preset time, the first switch valve SV1 and the third switch valve SV3 are closed again. When the rear right axle is lowered, first, the first switch valve SV1 and the third switch valve SV3 are opened at the same time, the compressor assembly CM is opened after a delay of the eighteenth preset time, the fourth air valve AV4 is opened again after a delay of the nineteenth preset time, the high-pressure gas tank RES H collects the gas discharged by the rear right air spring FR, when the rear right axle is lowered to a preset height, the fourth air valve AV4 is closed, after a delay of the twentieth preset time, the compressor assembly CM is closed, and after a delay of the twenty-first preset time, the first switch valve SV1 and the third switch valve SV3 are closed again.

[0072] Correspondingly, when the front axle is lowered, the front left air spring FL and the front right air spring FR are simultaneously exhausted, and when the rear axle is lowered, the rear left air spring RL and the rear right air spring RR are simultaneously exhausted, and the specific process can be referred to the above-mentioned first and second lowering modes of the front left axle, the front right axle, the rear left axle, and the rear right axle. For brief description, the details are not described herein.

[0073] In the air suspension lowering mode, through the opening sequence and delay time of each valve body and the compressor assembly CM, the blow-by problem of the system internal airflow is reduced, and the comfort of the whole vehicle is improved.

[0074] (3) Pressure balance mode

[0075] like Figure 5 As shown, when the current shaft pressure is balanced, the first air valve AV1 and the second air valve AV2 are opened simultaneously to keep the air pressure in the front right air spring FR and the front right air spring FR balanced. After a preset pressure balance time, the first air valve AV1 and the second air valve AV2 are closed simultaneously.

[0076] When the rear axle pressure is balanced, the third air valve AV3 and the fourth air valve AV4 are opened simultaneously to keep the air pressure in the rear left air spring RL and the rear right air spring RR balanced. After the preset pressure balance time, the third air valve AV3 and the fourth air valve AV4 are closed simultaneously.

[0077] When the pressure in the gas storage tank is balanced, the second switching valve SV2, the third switching valve SV3, and the fifth switching valve SV5 are opened simultaneously to keep the gas pressure in the high-pressure gas storage tank RES_H and the low-pressure gas storage tank RES_L balanced. After a preset pressure balance time, the second switching valve SV2, the third switching valve SV3, and the fifth switching valve SV5 are closed simultaneously.

[0078] (4) Stress test mode

[0079] like Figure 6 As shown, when measuring the pressure value of the high-pressure air tank RES_H, the first switching valve SV1, the second switching valve SV2, and the fourth switching valve SV4 are opened simultaneously. The opening of the first switching valve SV1 and the fourth switching valve SV4 opens the air passage between the high-pressure air tank RES_H and the pressure and temperature sensor P / T. The pressure and temperature sensor P / T is used for monitoring, and the second switching valve SV2 is opened to maintain the pressure balance of the entire air passage, avoid the problem of air leakage within the system, and improve the comfort of the whole vehicle.

[0080] When measuring the pressure value of the front left air spring FL, the first air valve AV1 is opened to open the air passage between the front left air spring FL and the pressure and temperature sensor P / T, and the pressure and temperature sensor P / T is used for monitoring.

[0081] Similarly, when measuring the pressure value of the front right air spring FR, the second air valve AV2 is opened to open the air path between the front right air spring FR and the pressure and temperature sensor P / T, and the pressure and temperature sensor P / T is used for monitoring.

[0082] When measuring the pressure value of the rear left air spring RL, the third air valve AV3 is opened to open the air path between the rear left air spring RL and the pressure and temperature sensor P / T, and the pressure and temperature sensor P / T is used for monitoring.

[0083] When measuring the pressure value of the rear right air spring RR, the fourth air valve AV4 is opened to open the air path between the rear right air spring RR and the pressure and temperature sensor P / T, and the pressure and temperature sensor P / T is used for monitoring.

[0084] (5) External air direct charging mode

[0085] like Figure 7 As shown, when the high-pressure air tank RES_H is being filled, the first switching valve SV1 and the fourth switching valve SV4 are opened simultaneously. After a nine-preset delay, the compressor assembly CM is turned on. The opening of the first switching valve SV1 opens the direct external air supply path to the high-pressure air tank RES_H. The external air, after being filtered and dried by the air filter dryer AF+AD, is pressurized by the compressor assembly CM and delivered to the high-pressure air tank RES_H. The opening of the fourth switching valve SV4 ensures pressure balance within the system, preventing air leakage issues later. After the pressure in the high-pressure air tank RES_H reaches the preset pressure value, the compressor assembly CM is turned off. After a tenth-preset delay, the first switching valve SV1 and the fourth switching valve SV4 are closed simultaneously.

[0086] like Figure 8 As shown, when the front shaft air spring is filled with external air, the fourth switching valve SV4 is opened. After a 22-preset delay, the compressor assembly CM is turned on. After a 23-preset delay, the first air valve AV1 and the second air valve AV2 are opened simultaneously. After the air pressure values ​​in the front left air spring FL and the front right air spring FR reach the preset pressure values, the first air valve AV1 and the second air valve AV2 are closed simultaneously. After a 24-preset delay, the compressor assembly CM is turned off. After a 25-preset delay, the fourth switching valve SV4 is closed.

[0087] When the rear axle air spring is filled with external air, the fourth switching valve SV4 is opened. After a 22-time preset delay, the compressor assembly CM is turned on. After a 23-time preset delay, the third air valve AV3 and the fourth air valve AV4 are opened simultaneously. After the air pressure values ​​in the rear left air spring RL and the rear right air spring RR reach the preset pressure values, the third air valve AV3 and the fourth air valve AV4 are closed simultaneously. After a 24-time preset delay, the compressor assembly CM is turned off. After a 25-time preset delay, the fourth switching valve SV4 is closed.

[0088] In the external air direct charging mode, the opening sequence and delay time of each valve body and compressor assembly CM are controlled to reduce the problem of air leakage inside the system and improve the comfort of the whole vehicle.

[0089] (6) Desiccant regeneration mode

[0090] As shown in Figure 9 When the desiccant in the air filter desiccant dryer AF+AD is regenerated, the first switching valve SV1 and the fourth switching valve SV4 are opened at the same time, the exhaust valve EV is opened after a delay of the fifteenth preset time, the exhaust path of the high-pressure gas tank RES H is opened through the opening of the first switching valve SV1, the gas in the high-pressure gas tank RES H flows through the desiccant in the air filter desiccant dryer AF+AD and is discharged to the atmosphere, so that the desiccant in the air filter desiccant dryer AF+AD is regenerated by using the dry gas in the high-pressure gas tank RES H, and the air flow in the system is reduced by controlling the opening sequence and delay time of the first switching valve SV1, the fourth switching valve SV4 and the exhaust valve EV. After a preset regeneration time, the exhaust valve EV is closed, and the first switching valve SV1 and the fourth switching valve SV4 are closed at the same time after a delay of the sixteenth preset time.

[0091] (7) Exhaust mode

[0092] When the front left air spring FL is currently descending and is being exhausted to the atmosphere, the first air valve AV1 and the third switching valve SV3 are opened at the same time, the exhaust valve EV is opened after a delay of the eleventh preset time, the exhaust path of the front left air spring FL is opened through the opening of the first air valve AV1, the third switching valve SV3 and the exhaust valve EV, the gas in the front left air spring FL is exhausted to the atmosphere, and the air flow in the system is reduced by controlling the opening sequence and delay time of the first air valve AV1, the third switching valve SV3 and the exhaust valve EV. After the front left axle descends to a preset height, the exhaust valve EV is closed, and the first air valve AV1 and the third switching valve SV3 are closed at the same time after a delay of the twelfth preset time.

[0093] When the front right air spring FR is currently descending and is being exhausted to the atmosphere, the second air valve AV2 and the third switching valve SV3 are opened at the same time, the exhaust valve EV is opened after a delay of the eleventh preset time, the exhaust path of the front right air spring FR is opened through the opening of the second air valve AV2, the third switching valve SV3 and the exhaust valve EV, the gas in the front right air spring FR is exhausted to the atmosphere, and the air flow in the system is reduced by controlling the opening sequence and delay time of the second air valve AV2, the third switching valve SV3 and the exhaust valve EV. After the front right axle descends to a preset height, the exhaust valve EV is closed, and the second air valve AV2 and the third switching valve SV3 are closed at the same time after a delay of the twelfth preset time.

[0094] When the rear left axle is lowered, and the rear left air spring RL is vented to the atmosphere, the third air valve AV3 and the third switching valve SV3 are opened simultaneously, and the exhaust valve EV is opened after a delay of the eleventh preset time, the exhaust passage of the rear left air spring RL is opened by opening of the third air valve AV3, the third switching valve SV3 and the exhaust valve EV, the gas in the rear left air spring RL is vented to the atmosphere, and by controlling the opening sequence and the delay time of the third air valve AV3, the third switching valve SV3 and the exhaust valve EV, the blow-by problem of the internal airflow of the system is reduced, and the comfort of the vehicle is improved. After the rear left axle is lowered to the preset height, the exhaust valve EV is closed, and the third air valve AV3 and the third switching valve SV3 are closed simultaneously after a delay of the twelfth preset time.

[0095] When the rear right axle is lowered, and the rear right air spring RR is vented to the atmosphere, the fourth air valve AV4 and the third switching valve SV3 are opened simultaneously, and the exhaust valve EV is opened after a delay of the eleventh preset time, the exhaust passage of the rear right air spring RR is opened by opening of the fourth air valve AV4, the third switching valve SV3 and the exhaust valve EV, the gas in the rear right air spring RR is vented to the atmosphere, and by controlling the opening sequence and the delay time of the fourth air valve AV4, the third switching valve SV3 and the exhaust valve EV, the blow-by problem of the internal airflow of the system is reduced, and the comfort of the vehicle is improved. After the rear right axle is lowered to the preset height, the exhaust valve EV is closed, and the fourth air valve AV4 and the third switching valve SV3 are closed simultaneously after a delay of the twelfth preset time.

[0096] Similarly, as shown in Figure 10 When the front axle is lowered, and the front axle air spring is vented to the atmosphere, the front left air spring FL and the front right air spring FR are vented to the atmosphere simultaneously. Specifically, the first air valve AV1, the second air valve AV2 and the third switching valve SV3 are opened simultaneously, and the exhaust valve EV is opened after a delay of the eleventh preset time, the exhaust passage of the front left air spring FL and the front right air spring FR is opened by opening of the first air valve AV1, the second air valve AV2, the third switching valve SV3 and the exhaust valve EV, the gas in the front left air spring FL and the front right air spring FR is vented to the atmosphere, and by controlling the opening sequence and the delay time of the first air valve AV1, the second air valve AV2, the third switching valve SV3 and the exhaust valve EV, the blow-by problem of the internal airflow of the system is reduced, and the comfort of the vehicle is improved. After the front axle is lowered to the preset height, the exhaust valve EV is closed, and the first air valve AV1, the second air valve AV2 and the third switching valve SV3 are closed simultaneously after a delay of the twelfth preset time.

[0097] When the rear axle lowers and the rear axle air springs exhaust to the atmosphere, the rear left air spring RL and the rear right air spring RR should simultaneously exhaust to the atmosphere. Specifically, the third air valve AV3, the fourth air valve AV4, and the third switching valve SV3 are opened simultaneously. After an eleventh preset time delay, the exhaust valve EV is opened. By opening the third air valve AV3, the fourth air valve AV4, the third switching valve SV3, and the exhaust valve EV, the exhaust paths of the rear left air spring RL and the rear right air spring RR are opened, allowing the gas in the rear left air spring RL and the rear right air spring RR to be discharged to the atmosphere. By controlling the opening sequence and delay time of the third air valve AV3, the fourth air valve AV4, the third switching valve SV3, and the exhaust valve EV, the problem of airflow leakage within the system is reduced, improving the overall vehicle comfort. After the front axle lowers to the preset height, the exhaust valve EV is closed, and after a twelfth preset time delay, the third air valve AV3, the fourth air valve AV4, and the third switching valve SV3 are simultaneously closed.

[0098] like Figure 11 As shown, when the high-pressure gas tank RES_H exhausts into the atmosphere, the first switching valve SV1, the second switching valve SV2, and the fourth switching valve SV4 are opened simultaneously. After a 26-preset delay, the exhaust valve EV is opened. The opening of the first switching valve SV1 and the exhaust valve EV opens the exhaust path of the high-pressure gas tank RES_H, allowing the gas inside RES_H to be discharged into the atmosphere. The opening of the second switching valve SV2 and the fourth switching valve SV4 balances the internal pressure of the system. Simultaneously, by controlling the opening sequence and delay time of the first switching valve SV1, the second switching valve SV2, the fourth switching valve SV4, and the exhaust valve EV, the problem of air leakage within the system is reduced, improving the overall vehicle comfort. After the gas pressure in the high-pressure gas tank RES_H drops to a preset value, the exhaust valve EV is closed. After a 27-preset delay, the first switching valve SV1, the second switching valve SV2, and the fourth switching valve SV4 are closed simultaneously again.

[0099] In the exhaust mode of this application embodiment, in each working state, the dry gas discharged through the exhaust valve EV will flow through the desiccant in the air filter dryer AF+AD, so the desiccant in the air filter dryer AF+AD can be regenerated.

[0100] (8) Low-pressure to high-pressure inflation mode

[0101] like Figure 12When the high-pressure gas tank RES_H is filled with gas, the first switch valve SV1, the fourth switch valve SV4 and the fifth switch valve SV5 are opened at the same time, the compressor assembly CM is opened after a delay of the thirteenth preset time, the gas path between the low-pressure gas tank RES_L and the high-pressure gas tank RES_H is opened through the opening of the first switch valve SV1 and the fifth switch valve SV5, the gas in the low-pressure gas tank RES_L is transported into the high-pressure gas tank RES_H, and the pressure in the system is balanced through the opening of the fourth switch valve SV4. When the pressure value of the high-pressure gas tank RES_H reaches the preset pressure value, the compressor assembly CM is closed, and the first switch valve SV1, the fourth switch valve SV4 and the fifth switch valve SV5 are closed at the same time after a delay of the fourteenth preset time.

[0102] It should be noted that in the present application, before the system is in action in each working mode, each valve body and the compressor assembly CM are in a closed state.

[0103] In a specific embodiment, the delay time of each working mode is shown in Table 1 as follows:

[0104]

[0105]

[0106] Table 1

[0107] As shown in Table 1 above, the first preset time is 80 ms, the second preset time is 400 ms, further, the third preset time is 400 ms, the fourth preset time is 80 ms; the fifth preset time is 200 ms, further, the seventeenth preset time is 200 ms; the sixth preset time is 80 ms, the seventh preset time is 200 ms, the eighth preset time is 80 ms; the eighteenth preset time is 80 ms, the nineteenth preset time is 200 ms, further, the twentieth preset time is 200 ms, the twenty-first preset time is 80 ms; the ninth preset time is 80 ms, further, the tenth preset time is 80 ms; the twenty-second preset time is 80 ms, the twenty-third preset time is 400 ms, further, the twenty-fourth preset time is 400 ms, the twenty-fifth preset time is 80 ms; the fifteenth preset time is 100 ms, further, the sixteenth preset time is 100 ms; the eleventh preset time is 100 ms, further, the twelfth preset time is 100 ms; the twenty-sixth preset time is 100 ms, further, the twenty-seventh preset time is 100 ms; the thirteenth preset time is 80 ms, further, the fourteenth preset time is 80 ms. The valve opening sequence and delay time of each valve body and the compressor assembly CM are one of the innovations of the present application, which can effectively reduce the air flow leakage problem in the system, improve the comfort of the whole vehicle, effectively reduce the noise, prolong the service life of the compressor, and solve the problems of slow vehicle body lowering speed, low compressor working efficiency, and uncertain back pressure of the air supply system, which causes air flow leakage at the valve opening moment and makes the whole vehicle height fluctuate.

[0108] In summary, the present specification discloses an air suspension control system and its control method, which sets an air filter dryer at the front end of the air path to filter and dry the air entering the system in advance, which can effectively prevent the moisture and impurities in the air from affecting the air suspension system, such as corrosion, freezing, etc., thereby improving the performance and service life of the air suspension system, and through the design of the air path, the air in the present application can be recycled in the system, without frequent air intake from the atmosphere, reducing energy consumption, and being beneficial to environmental protection, and the dry air is basically recycled in the system, which can reduce the working load of the compressor and the air filter dryer, effectively improve the working efficiency of the compressor, the service life of the compressor, and the service life of the air filter dryer. In addition, through the control of the valve opening sequence and delay time of each valve body and the compressor, the air flow leakage problem in the system can be effectively reduced, thereby realizing the improvement of NVH, i.e. the improvement of noise, vibration and acoustic comfort, and further improving the comfort of the whole vehicle and vehicle driving.

[0109] Those skilled in the art can understand that the modules or flows in the drawings are not necessarily required for implementing the present application. The modules in the device in the embodiments can be distributed in the device in the embodiments according to the embodiment description, or can be changed and located in one or more devices different from the embodiments. The modules in the above embodiments can be combined into one module, or can be further split into multiple sub-modules.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An air suspension control system characterized by, The air suspension control system comprises a compressor assembly, an air filter dryer, a one-way valve, an exhaust valve, a first switching valve, a second switching valve, a third switching valve, a fourth switching valve, a fifth switching valve, a first air valve, a second air valve, a third air valve, a fourth air valve, a pressure temperature sensor, a high-pressure gas storage tank and a low-pressure gas storage tank, The air outlet end of the air filter dryer is connected with the air inlet end of the one-way valve, the air outlet end of the one-way valve is connected with the air inlet end of the compressor assembly, the air outlet end of the compressor assembly, the first valve port of the exhaust valve, the first valve port of the first switching valve and the first valve port of the fourth switching valve are connected with each other, the second valve port of the exhaust valve is connected with the air outlet end of the air filter dryer, the second valve port of the first switching valve and the first valve port of the second switching valve are connected with the high-pressure gas storage tank, the first valve port of the first air valve is connected with the front left air spring, the first valve port of the second air valve is connected with the front right air spring, the first valve port of the third air valve is connected with the rear left air spring, the first valve port of the fourth air valve is connected with the rear right air spring, the second valve port of the first air valve, the second valve port of the second air valve, the second valve port of the third air valve and the second valve port of the fourth air valve are connected with the second valve port of the fourth switching valve, and the second valve port of the first air valve, the second valve port of the second air valve, the second valve port of the third air valve and the second valve port of the fourth air valve are connected with the first valve port of the third switching valve, the pressure temperature sensor is arranged on the gas path connected with the third switching valve, the fourth switching valve, the first air valve, the second air valve, the third air valve and the fourth air valve, the first valve port of the fifth switching valve is connected with the low-pressure gas storage tank, and the second valve port of the second switching valve, the second valve port of the third switching valve, the second valve port of the fifth switching valve and the air inlet end of the compressor assembly are connected with each other. When the front left axle is raised and air is supplied to the front left air spring, the second switching valve and the fourth switching valve are opened at the same time, the compressor assembly is opened after a first preset time, the first air valve is opened after a second preset time, until the front left axle is raised to a preset height, the first air valve is closed, the compressor assembly is closed after a third preset time, and the second switching valve and the fourth switching valve are closed after a fourth preset time. When the front left axle is lowered and air is exhausted from the front left air spring, the third switching valve and the fifth switching valve are opened at the same time, the first air valve is opened after a fifth preset time, the low-pressure gas storage tank collects the air exhausted from the front left air spring, if the pressure value of the low-pressure gas storage tank reaches a preset pressure value, the fifth switching valve and the first air valve are closed, the first switching valve is opened, the compressor assembly is opened after a sixth preset time, the first air valve is opened after a fifth preset time, the high-pressure gas storage tank collects the air exhausted from the front left air spring, until the front left axle is lowered to a preset height, the first air valve is closed, the compressor assembly is closed after a seventh preset time, and the first switching valve and the third switching valve are closed after an eighth preset time.

2. The air suspension control system of claim 1, wherein, The air suspension control system further comprises a pressure limiting valve, and the air outlet ends of the compressor assembly are connected to the air inlet ends of the one-way valves and the air outlet ends of the one-way valves through the pressure limiting valve.

3. The air suspension control system of claim 1, wherein, The exhaust valve, the first switching valve, the second switching valve, the third switching valve, the fourth switching valve, the fifth switching valve, the first air valve, the second air valve, the third air valve, and the fourth air valve are all two-position two-way electromagnetic valves.

4. The air suspension control system of claim 1, wherein, The preset pressure value of the high-pressure gas tank is 1.4 MPa, and the preset pressure value of the low-pressure gas tank is 0.5 MPa.

5. An air suspension control method characterized by, The air suspension control method is applied to the air suspension control system of any one of claims 1 to 4. When the front left axle is raised and air is supplied to the front left air spring, the second switching valve and the fourth switching valve are opened at the same time, the compressor assembly is opened after a first preset time, the first air valve is opened after a second preset time, until the front left axle is raised to a preset height, the first air valve is closed, the compressor assembly is closed after a third preset time, and the second switching valve and the fourth switching valve are closed at the same time after a fourth preset time; When the front right axle is raised and air is supplied to the front right air spring, the second switching valve and the fourth switching valve are opened at the same time, the compressor assembly is opened after the first preset time, the second air valve is opened after the second preset time, until the front right axle is raised to a preset height, the second air valve is closed, the compressor assembly is closed after the third preset time, and the second switching valve and the fourth switching valve are closed at the same time after the fourth preset time; When the rear left axle is raised and air is supplied to the rear left air spring, the second switching valve and the fourth switching valve are opened at the same time, the compressor assembly is opened after the first preset time, the third air valve is opened after the second preset time, until the rear left axle is raised to a preset height, the third air valve is closed, the compressor assembly is closed after the third preset time, and the second switching valve and the fourth switching valve are closed at the same time after the fourth preset time; When the rear right axle is raised and air is supplied to the rear right air spring, the second switching valve and the fourth switching valve are opened at the same time, the compressor assembly is opened after the first preset time, the fourth air valve is opened after the second preset time, until the rear right axle is raised to a preset height, the fourth air valve is closed, the compressor assembly is closed after the third preset time, and the second switching valve and the fourth switching valve are closed at the same time after the fourth preset time; When the front left axle is descending, the front left air spring is discharging, the third switch valve and the fifth switch valve are opened at the same time, the first air valve is opened after a delay of the fifth preset time, the low-pressure gas storage tank collects the gas discharged by the front left air spring, if the pressure value of the low-pressure gas storage tank reaches a preset pressure value, the fifth switch valve and the first air valve are closed, the first switch valve is opened at the same time, the compressor assembly is opened after a delay of the sixth preset time, the first air valve is opened after a delay of the fifth preset time, the high-pressure gas storage tank collects the gas discharged by the front left air spring, until the front left axle descends to a preset height, the first air valve is closed, the compressor assembly is closed after a delay of the seventh preset time, the first switch valve and the third switch valve are closed after a delay of the eighth preset time; When the front right axle is descending, the front right air spring is discharging, the third switch valve and the fifth switch valve are opened at the same time, the second air valve is opened after a delay of the fifth preset time, the low-pressure gas storage tank collects the gas discharged by the front right air spring, if the pressure value of the low-pressure gas storage tank reaches a preset pressure value, the fifth switch valve and the second air valve are closed, the first switch valve is opened at the same time, the compressor assembly is opened after a delay of the sixth preset time, the second air valve is opened after a delay of the fifth preset time, the high-pressure gas storage tank collects the gas discharged by the front right air spring, until the front right axle descends to a preset height, the second air valve is closed, the compressor assembly is closed after a delay of the seventh preset time, the first switch valve and the third switch valve are closed after a delay of the eighth preset time; When the rear left axle is descending, the rear left air spring is discharging, the third switch valve and the fifth switch valve are opened at the same time, the third air valve is opened after a delay of the fifth preset time, the low-pressure gas storage tank collects the gas discharged by the rear left air spring, if the pressure value of the low-pressure gas storage tank reaches a preset pressure value, the fifth switch valve and the third air valve are closed, the first switch valve is opened at the same time, the compressor assembly is opened after a delay of the sixth preset time, the third air valve is opened after a delay of the fifth preset time, the high-pressure gas storage tank collects the gas discharged by the rear left air spring, until the rear left axle descends to a preset height, the third air valve is closed, the compressor assembly is closed after a delay of the seventh preset time, the first switch valve and the third switch valve are closed after a delay of the eighth preset time; When the rear right axle is descending, the rear right air spring is exhausting, the third switch valve and the fifth switch valve are opened at the same time, the fourth air valve is opened after a delay of the fifth preset time, the low-pressure gas tank collects the gas exhausted by the rear right air spring, if the pressure value of the low-pressure gas tank reaches a preset pressure value, the fifth switch valve and the fourth air valve are closed, the first switch valve is opened at the same time, the compressor assembly is opened after a delay of the sixth preset time, the fourth air valve is opened after a delay of the fifth preset time, the high-pressure gas tank collects the gas exhausted by the rear right air spring, until the rear right axle descends to a preset height, the fourth air valve is closed, the compressor assembly is closed after a delay of the seventh preset time, the first switch valve and the third switch valve are closed after a delay of the eighth preset time.

6. The air suspension control method according to claim 5, characterized by, The air suspension control method further comprises: When the high-pressure gas tank is being inflated, the first switch valve and the fourth switch valve are opened at the same time, the compressor assembly is opened after a delay of a ninth preset time, external air is filtered and dried by the air filter dryer, is pressurized by the compressor assembly, and is then delivered into the high-pressure gas tank, until the pressure value of the high-pressure gas tank reaches a preset pressure value, the compressor assembly is closed, the first switch valve and the fourth switch valve are closed at the same time after a delay of a tenth preset time.

7. The air suspension control method according to claim 5, characterized by, The air suspension control method further comprises: When the front left axle is descending, the front left air spring is exhausting, the first air valve and the third switch valve are opened at the same time, the exhaust valve is opened after a delay of an eleventh preset time, the gas in the front left air spring is exhausted to the atmosphere, until the front left axle descends to a preset height, the exhaust valve is closed, the first air valve and the third switch valve are closed at the same time after a delay of a twelfth preset time; When the front right axle is descending, the front right air spring is exhausting, the second air valve and the third switch valve are opened at the same time, the exhaust valve is opened after a delay of the eleventh preset time, the gas in the front right air spring is exhausted to the atmosphere, until the front right axle descends to a preset height, the exhaust valve is closed, the second air valve and the third switch valve are closed at the same time after a delay of the twelfth preset time; When the rear left axle is descending, the rear left air spring is exhausting, the third air valve and the third switch valve are opened at the same time, the exhaust valve is opened after a delay of the eleventh preset time, the gas in the rear left air spring is exhausted to the atmosphere, until the rear left axle descends to a preset height, the exhaust valve is closed, the third air valve and the third switch valve are closed at the same time after a delay of the twelfth preset time; When the rear right axle is descending, the rear right air spring is exhausting, the fourth air valve and the third switch valve are opened at the same time, the exhaust valve is opened after a delay of the eleventh preset time, the gas in the rear right air spring is exhausted to the atmosphere, until the rear right axle descends to a preset height, the exhaust valve is closed, the fourth air valve and the third switch valve are closed at the same time after a delay of the twelfth preset time.

8. The air suspension control method according to claim 5, characterized by, The air suspension control method further comprises: When the high-pressure gas tank is inflated, the first switch valve, the fourth switch valve and the fifth switch valve are opened at the same time, the compressor assembly is opened after a thirteenth preset time delay, the gas in the low-pressure gas tank is delivered into the high-pressure gas tank, until the pressure value of the high-pressure gas tank reaches a preset pressure value, the compressor assembly is closed, and the first switch valve, the fourth switch valve and the fifth switch valve are closed at the same time after a fourteenth preset time delay.

9. The air suspension control method according to claim 5, characterized by, The air suspension control method further comprises: When measuring the pressure value of the front left air spring, the first air valve is opened, and the pressure temperature sensor is used for monitoring; When measuring the pressure value of the front right air spring, the second air valve is opened, and the pressure temperature sensor is used for monitoring; When measuring the pressure value of the rear left air spring, the third air valve is opened, and the pressure temperature sensor is used for monitoring; When measuring the pressure value of the rear right air spring, the fourth air valve is opened, and the pressure temperature sensor is used for monitoring; When measuring the pressure value of the high-pressure gas tank, the first switch valve, the second switch valve and the fourth switch valve are opened at the same time, and the pressure temperature sensor is used for monitoring.

10. The air suspension control method according to claim 5, characterized by, The air suspension control method further comprises: When the desiccant in the air filter dryer is regenerated, the first switch valve and the fourth switch valve are opened at the same time, the exhaust valve is opened after a fifteenth preset time delay, the gas in the high-pressure gas tank flows through the desiccant in the air filter dryer and is discharged to the atmosphere, after a preset regeneration time, the exhaust valve is closed, and the first switch valve and the fourth switch valve are closed at the same time after a sixteenth preset time delay.

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