Closed air spring control system and control method thereof

Abstract

The application provides a closed air spring control system and a control method thereof, and relates to the technical field of vehicle control, and comprises a closed air spring adjusting assembly, an external air inlet and exhaust assembly, an air tank and an air compression, drying and distribution assembly; the closed air spring adjusting assembly is connected with the external air inlet and exhaust assembly, a connection point is connected with the air tank through the air compression, drying and distribution assembly, and the air compression, drying and distribution assembly only makes air flow through the dryer when the air tank is inflated and the dryer is regenerated, thereby solving the problems that the existing closed air spring control system cannot completely avoid the internal circulation air passing through the dryer, and that increasing the electromagnetic valve on the drying path increases the number of electromagnetic valves of the closed air spring control system and complicates the control logic.

Description

Technical Field

[0001] This invention relates to the field of vehicle control technology, specifically to a closed air spring control system and its control method. Background Technology

[0002] An air spring in a car is a suspension system component that uses compressed air as the elastic medium. It is used to replace traditional coil springs or leaf springs, greatly improving ride comfort and providing drivers with a high-quality experience.

[0003] Closed-loop air springs have advantages such as fast inflation speed and simple structure, and are widely used in closed-loop air spring regulating systems. In a closed-loop air spring regulating system, the air spring circulates back and forth. During this circulation, the dryer is located on the air's inevitable path, making dryer regeneration and air drying a significant challenge.

[0004] In the process of developing this invention, the inventors discovered that existing closed-loop air spring control systems, by adding a bypass path in parallel to the airflow path from the airbag back to the air tank, controlled by a pneumatic valve, prevent the dry air from passing through the dryer during internal circulation, thus avoiding the repetitive passage of dry air through the dryer and the resulting moisture being carried out of the airbag. However, due to the presence of a throttle valve in the dryer path, the continuously open nature of the throttle valve prevents complete bypass of the dryer, allowing some gas to still flow through it, potentially carrying moisture. Therefore, the problem of internally recirculated air passing through the dryer is not completely eliminated. While adding a solenoid valve to the drying path can solve the above problem, it increases the number of solenoid valves in the closed-loop air spring control system and complicates the control logic. Summary of the Invention

[0005] In response, this application provides a closed-loop air spring control system and its control method to solve the problems that existing systems cannot completely prevent internal recirculated air from passing through the dryer, and that adding solenoid valves to the drying path increases the number of solenoid valves in the closed-loop air spring control system and complicates the control logic.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] The first aspect of this application discloses a closed air spring control system, including: a closed air spring adjustment assembly, an external intake and exhaust assembly, an air tank, and an air compression, drying, and distribution assembly;

[0008] The closed-loop air spring regulating assembly is connected to the external intake and exhaust assembly, and the connection point is connected to the air tank through the air compression and drying distribution assembly. The air compression and drying distribution assembly allows air to flow through the dryer only when the air tank is being filled and the dryer is being regenerated.

[0009] Optionally, in the above-mentioned closed air spring control system, the air compression drying distribution assembly includes: a two-position four-way valve, an air compressor, a dryer, a first one-way valve, a second one-way valve, a throttle valve, and a two-position three-way valve;

[0010] The first valve port of the two-position four-way valve is connected to the second valve port of the two-position three-way valve, and the connection point is connected to the air storage tank; the second valve port of the two-position four-way valve is connected to the outlet of the air compressor, the inlet of the dryer, and the inlet of the first one-way valve, respectively; the third valve port of the two-position four-way valve is connected to the connection point of the closed air spring regulating assembly and the external intake and exhaust assembly; the fourth valve port of the two-position four-way valve is connected to the inlet of the air compressor.

[0011] The outlet of the first check valve is connected to the second valve port of the two-position three-way valve;

[0012] The outlet of the dryer is connected to the inlet of the second one-way valve and one end of the throttle valve, respectively; the outlet of the second one-way valve and the other end of the throttle valve are both connected to the third valve port of the two-position three-way valve.

[0013] Optionally, in the above-mentioned closed air spring control system, when the two-position four-way valve is in the first working position, the third valve port and the fourth valve port of the two-position four-way valve are connected.

[0014] When the two-position four-way valve is in the second working position, the second valve port of the two-position four-way valve is connected to the third valve port of the two-position four-way valve, and the fourth valve port of the two-position four-way valve is connected to the first valve port of the two-position four-way valve.

[0015] When the two-position three-way valve is in the first working position, the first valve port of the two-position three-way valve is connected to the second valve port of the two-position three-way valve.

[0016] When the two-position three-way valve is in the second working position, the third valve port of the two-position three-way valve is connected to the second valve port of the two-position three-way valve.

[0017] Optionally, in the above-described closed air spring control system, the external intake and exhaust assembly includes: a first electromagnetic switching valve, an intake and exhaust pipe, and a filter;

[0018] The first valve port of the first electromagnetic switch valve is connected to the filter through the inlet and outlet pipes;

[0019] The second valve port of the first electromagnetic switch valve is connected to the closed air spring regulating assembly and the air compression drying distribution assembly.

[0020] Optionally, in the above-mentioned closed air spring control system, the closed air spring adjustment assembly includes multiple closed air spring branches, each of which is connected in parallel and shares a pressure sensor, and the connection point connects the external intake and exhaust assembly and the air compression and drying distribution assembly.

[0021] Optionally, in the above-mentioned closed air spring control system, the closed air spring branch includes: a closed air spring and a second electromagnetic switch valve.

[0022] The first valve port of the second electromagnetic switch valve is connected to the air bladder of the closed air spring.

[0023] The second valve port of the second electromagnetic switch valve is connected to the external intake and exhaust assembly and the air compression and drying distribution assembly.

[0024] Optionally, in the above-mentioned closed air spring control system, the first electromagnetic switch valve, the second electromagnetic switch valve, the two-position four-way valve, the two-position three-way valve, the first check valve, the second check valve, and the throttle valve, and the pipelines between them are integrated into one unit to form an air distribution valve.

[0025] The second aspect of this application discloses a control method for a closed air spring control system, applied to any of the closed air spring control systems disclosed in the first aspect, the control method comprising:

[0026] When the closed air spring control system fills the air tank, it controls the first electromagnetic switch valve and the air compressor in the closed air spring control system to open, and the two-position three-way valve to be in the second working position.

[0027] When the closed air spring control system finishes filling the air tank, it first controls the air compressor to shut down, the two-position three-way valve to the first working position, and the two-position four-way valve to the second working position. Then, it controls the two-position four-way valve to the first working position and closes the first electromagnetic switch valve.

[0028] When the closed air spring control system inflates the air bladder of the closed air spring, it controls the two-position four-way valve to be in the second working position, the air compressor to be turned on, and the second electromagnetic switch valve corresponding to the closed air spring to be inflated to be turned on.

[0029] When the closed air spring control system finishes inflating the air bladder of the closed air spring, it first controls the air compressor to shut down, the second electromagnetic switch valve corresponding to the closed air spring to be inflated to close, the first electromagnetic switch valve to open, then controls the two-position four-way valve to be in the first working position, and finally controls the first electromagnetic switch valve to close.

[0030] When the closed air spring control system vents air from the air bladder of the closed air spring, the second electromagnetic switch valve corresponding to the closed air spring to be vented opens, the two-position four-way valve is in the first working position, the two-position three-way valve is in the first working position, and the air compressor is turned on.

[0031] When the closed air spring control system finishes venting the airbag of the closed air spring, it first controls the air compressor to shut down, the second electromagnetic switch valve corresponding to the closed air spring to be vented to close, the first electromagnetic switch valve to open, and the two-position four-way valve to be in the second working position. Then it controls the two-position four-way valve to be in the first working position and the first electromagnetic switch valve to close.

[0032] When the closed-loop air spring control system dryer is regenerated, it controls the first electromagnetic switch valve to open, the two-position four-way valve to be in the second working position, and the two-position three-way valve to be in the second working position.

[0033] Optionally, the control method for the above-mentioned closed air spring control system further includes:

[0034] When the closed air spring control system expels too much air from the closed air spring bladder, it controls the two-position four-way valve to the second working position.

[0035] Optionally, the control method for the above-mentioned closed air spring control system further includes:

[0036] When the closed air spring control system over-inflates the air bladder of the closed air spring, it controls the two-position four-way valve to be in the first working position.

[0037] This invention provides a closed-loop air spring control system, comprising: a closed-loop air spring adjustment assembly, an external intake and exhaust assembly, an air tank, and an air compression and drying distribution assembly; the closed-loop air spring adjustment assembly is connected to the external intake and exhaust assembly, and the connection point is connected to the air tank through the air compression and drying distribution assembly; the air compression and drying distribution assembly allows air to flow through the dryer only when the air tank is being filled and the dryer is being regenerated, thus solving the problem that existing systems cannot completely prevent internal recirculated air from passing through the dryer, and that adding solenoid valves to the drying path increases the number of solenoid valves in the closed-loop air spring control system and complicates the control logic. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0039] Figure 1 A schematic diagram of a closed air spring control system provided in this application;

[0040] Figure 2 A schematic diagram of another closed air spring control system provided in this application embodiment;

[0041] Closed-loop air spring regulating assembly 100, external intake and exhaust assembly 200, air compression and drying distribution assembly 300, first solenoid switch valve 1, second solenoid switch valve 2, two-position four-way valve 6, two-position three-way valve 7, air compressor 8, first check valve 9, dryer 10, second check valve 12, air tank 13, throttle valve 14, closed-loop air spring air bladder 1a, pressure sensor 1b. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] This application provides a closed-loop air spring control system and its control method to solve the problems that existing systems cannot completely prevent internal recirculated air from passing through the dryer, and that adding solenoid valves to the drying path increases the number of solenoid valves in the closed-loop air spring control system and complicates the control logic.

[0044] Please see Figure 1 The closed air spring control system mainly includes: a closed air spring adjustment assembly 100, an external intake and exhaust assembly 200, an air tank 13, and an air compression and drying distribution assembly 300.

[0045] The closed air spring regulating assembly 100 is connected to the external intake and exhaust assembly 200. The connection point is connected to the air tank 13 through the air compression and drying distribution assembly 300. The air compression and drying distribution assembly 300 allows air to flow through the dryer 10 only when the air tank 13 is being filled and the dryer is being regenerated.

[0046] The air compression drying distribution assembly 300 only controls the air flow to the air receiver 10 when the air tank 13 is filled by the external intake and exhaust assembly 200, and when the dryer in the closed air spring control system is regenerated.

[0047] In practical applications, the dryer 10 is installed inside the air compression drying distribution assembly 300, and one end of the dryer is connected to the air compressor 8 inside the air compression drying distribution assembly 300.

[0048] In some embodiments, the same applies. Figure 1 As shown, the air compression drying distribution assembly mainly includes: a two-position four-way valve 6, an air compressor 8, a dryer 10, a first one-way valve 9, a second one-way valve 12, a throttle valve 14, and a two-position three-way valve 7.

[0049] The first valve port 1 of the two-position four-way valve 6 is connected to the second valve port 2 of the two-position three-way valve 7, and the connection point is connected to the air tank 13; the second valve port 2 of the two-position four-way valve 6 is connected to the outlet of the air compressor 8, the inlet of the dryer 10, and the inlet of the first one-way valve 9, respectively; the third valve port 3 of the two-position four-way valve 6 is connected to the connection point of the closed air spring regulating assembly 100 and the external intake and exhaust assembly 200; the fourth valve port 4 of the two-position four-way valve 6 is connected to the inlet of the air compressor 8; the outlet of the first one-way valve 9 is connected to the second valve port 2 of the two-position three-way valve 7; the outlet of the dryer 10 is connected to the inlet of the second one-way valve 12 and one end of the throttle valve 14, respectively; the outlet of the second one-way valve 12 and the other end of the throttle valve 14 are both connected to the third valve port 3 of the two-position three-way valve 7.

[0050] In practical applications, the two-position four-way valve 6 has two working positions. When the two-position four-way valve 6 is in the first working position, the third valve port 3 and the fourth valve port 3 of the two-position four-way valve 6 are connected. When the two-position four-way valve 6 is in the second working position, the second valve port 2 of the two-position four-way valve 6 is connected to the third valve port 3, and the fourth valve port 4 of the two-position four-way valve 6 is connected to the first valve port 1 of the two-position four-way valve 6.

[0051] In this application, the two-position four-way valve 6 being in the first working position is referred to as the two-position four-way valve 6 being in the default state, that is... Figure 1 The position shown; when the two-position four-way valve 6 is in the second working position, it is called the two-position four-way valve 6 in another state.

[0052] Similarly, the two-position three-way valve 7 also has two working positions. When the two-position three-way valve 7 is in the first working position, the first valve port 1 of the two-position three-way valve 7 is connected to the second valve port 2 of the two-position three-way valve 7; when the two-position three-way valve 7 is in the second working position, the third valve port 3 of the two-position three-way valve 7 is connected to the second valve port 2 of the two-position three-way valve 7.

[0053] In this application, the two-position three-way valve 7 being in the first working position is referred to as the two-position three-way valve 7 being in the default state, that is... Figure 1 The position shown; when the two-position three-way valve 7 is in the second working position, it is said that the two-position three-way valve 7 is in another state.

[0054] In some embodiments, the same applies. Figure 1 As shown, the external intake and exhaust assembly may include: a first solenoid valve 1, an intake and exhaust pipe, and a filter.

[0055] The first valve port 1 of the first electromagnetic switch valve 1 is connected to the filter through the inlet and outlet pipes; the second valve port 2 of the first electromagnetic switch valve 1 is connected to the closed air spring regulating assembly 200 and the air compression drying distribution assembly 300.

[0056] In practical applications, the intake and exhaust of air can be controlled by controlling the opening and closing state of the first electromagnetic switch valve 1.

[0057] It should be noted that the closed air spring regulating assembly 100 generally includes multiple closed air spring branches, each of which is connected in parallel and shares a pressure sensor 1b. The connection point is connected to the external intake and exhaust assembly 200 and the air compression and drying distribution assembly 300.

[0058] In practical applications, the number of branches in a closed air spring can be 4, that is... Figure 1 As shown. Pressure sensor 1b can sense the pressure of each closed air spring branch connected in parallel in real time.

[0059] In some embodiments, the same applies. Figure 1 As shown, the closed air spring branch may include: a closed air spring and a second solenoid valve 2.

[0060] The first valve port 1 of the second electromagnetic switch valve 2 is connected to the air bladder 1a of the closed air spring; the second valve port 2 of the second electromagnetic switch valve 2 is connected to the pressure sensor 1b, the external intake and exhaust assembly 200 and the air compression and drying distribution assembly 300.

[0061] Combination Figure 2 The closed-loop air spring control system shown in the diagram, when the closed-loop air spring control system fills the air tank 13, opens the first electromagnetic switch valve 1 to connect to the external atmosphere, turns on the air compressor 8, and controls the two-position three-way valve 7 to be in the second working position. At this time, air passages 21, 26, and 25 form a passage, and the external atmosphere will enter the closed-loop air spring control system through the first electromagnetic switch valve 1, then be pressurized by the air compressor 8, then be adsorbed by the dryer 10, and finally enter the air tank 13 through the second one-way valve 12 and the two-position three-way valve 7.

[0062] In practical applications, it is necessary to consider the impact of the air compressor 8's starting power on the entire system, and to avoid the two-position three-way valve 7's control lag, which could cause the first check valve 9 with pre-tightening force to be forced open by the compressed gas.

[0063] When the closed air spring control system finishes filling the air tank 13, it shuts off the air compressor 8, disconnects the power supply to the two-position three-way valve 7 to restore it to its default state, then energizes the two-position four-way valve 6 to put it in the second position, then disconnects the power supply to the two-position four-way valve 6 to restore it to its default state, and finally closes the first solenoid switch valve 1.

[0064] When the closed air spring control system inflates the air bladder 1a of the closed air spring, it controls the two-position four-way valve 6 to be in the second working position (energizing the two-position four-way valve 6), turns on the air compressor 8, and opens the second solenoid switch valve 2 corresponding to the closed air spring to be inflated. At this time, air passages 24, 23, 22, and 21 form a passage. Since the first one-way valve 9 keeps the air passage 27 open, the gas in the air tank 13 will enter the air compressor 8 through the two-position four-way valve 6 for pressurization, and then enter the air bladder 1a of the closed air spring to be inflated through the two-position four-way valve 6.

[0065] When the closed air spring control system finishes inflating the air bladder 1a of the closed air spring, the air compressor 8 is turned off, the second electromagnetic switch valve 2 corresponding to the closed air spring to be inflated is closed, the first electromagnetic switch valve 1 is opened, the pressure in the valve chamber of the two-position four-way valve 6 is released, the power supply to the two-position four-way valve 6 is then disconnected to put it in the default state, and finally the first electromagnetic switch valve 1 is closed.

[0066] When the closed air spring control system vents air from the air bladder 1a of the closed air spring, it opens the second solenoid valve 2 corresponding to the closed air spring to be vented, and turns on the air compressor 8. At this time, air passages 21, 23, 27, and 25 are connected, and the gas will enter the air compressor 8 from the air bladder 1a to be vented through the corresponding second solenoid valve 2 and two-position four-way valve 6 for pressurization. After being output from the air compressor 8, the gas passes through the first one-way valve 9 and two-position three-way valve 7 to enter the air tank 13. Since the two-position three-way valve 7 is in the default state, air passage 26 is in the open state.

[0067] When the closed air spring control system finishes venting the air bladder 1a of the closed air spring, the air compressor 8 is turned off, the second solenoid valve 2 corresponding to the closed air spring to be vented is closed, the first solenoid valve 1 is opened, and then the two-position four-way valve 6 is energized to put it in the second working position to fully release the air pressure in the valve chamber of the two-position four-way valve 6. Then the power supply to the two-position four-way valve 6 is disconnected to put it in the first working position. Finally, the first solenoid valve 1 is closed to cut off the connection between the closed air spring control system and the outside atmosphere.

[0068] When the closed-loop air spring control system regenerates the dryer, the first solenoid valve 1 is opened, energizing the two-position four-way valve 6 to its second working position, and energizing the two-position three-way valve 7 to its second working position. Gas passages 25, 26, 22, and 21 form a passage, and gas flows into the outside atmosphere through the two-position three-way valve 7, throttle valve 14, dryer 10, two-position four-way valve 6, and first solenoid valve 1, while carrying away the moisture in the dryer 10, thus performing the regeneration operation on the dryer.

[0069] It should be noted that, during the process of the closed air spring control system venting air from the air bladder 1a, if the closed air spring control system vents too much air from the air bladder 1a, the two-position four-way valve 6 can be controlled to the second working position, forming a passage through air passages 24, 23, 22, and 21, and the gas in the air tank 13 will be compressed into the corresponding air bladder 1a by the air compressor 8. Similarly, during the process of the closed air spring control system inflating the air bladder 1a, if the closed air spring control system inflates the air bladder 1a too much, the two-position four-way valve 6 can be controlled to the first working position, forming a passage through air passages 21, 23, and 27, and the gas in the air bladder 1a will be compressed into the air tank 13 by the compressor.

[0070] It should also be noted that energizing and shutting off the two-position four-way valve 6 can relieve pressure in the valve chamber of the two-position four-way valve 6, which can prevent the valve chamber from being in a high-pressure environment continuously, and also prevent the air compressor 8 from having excessive back pressure when it is started next time.

[0071] In practical applications, the first solenoid valve 1, the second solenoid valve 2, the two-position four-way valve 6, the two-position three-way valve 7, the first check valve 9, the second check valve 12, and the throttle valve 14, along with the pipelines between them, are integrated into one unit to form a gas distribution valve.

[0072] The air compressor 8, air tank 13, dryer 10, and air bladder 1a of the closed air spring are external components. The air distribution valve is connected to the air compressor 8, air tank 13, and air bladder 1a of the closed air spring according to... Figure 1 or Figure 2 The connection shown constitutes a closed air spring control system.

[0073] Based on the above principles, the closed-loop air spring control system provided in this embodiment includes: a closed-loop air spring adjustment assembly 100, an external intake and exhaust assembly 200, an air tank 13, and an air compression and drying distribution assembly 300. The closed-loop air spring adjustment assembly 100 is connected to the external intake and exhaust assembly 200, and the connection point is connected to the air tank 13 through the air compression and drying distribution assembly 300. The air compression and drying distribution assembly 300 allows air to flow through the dryer 10 only when the air tank 13 is being filled with air and the dryer is being regenerated. This solves the problem that existing systems cannot completely prevent internal recirculated air from passing through the dryer 10, and that adding solenoid valves to the drying path increases the number of solenoid valves in the closed-loop air spring control system and complicates the control logic.

[0074] Optionally, another embodiment of this application also provides a control method for a closed air spring control system, applied to the closed air spring control system as described in any of the above embodiments, the control method comprising:

[0075] When the closed air spring control system fills the air tank, it controls the first electromagnetic switch valve 1 and the air compressor 8 in the closed air spring control system to open, and the two-position three-way valve 7 to be in the second working position.

[0076] Combination Figure 2 In practice, when the closed air spring control system fills the air tank, the first electromagnetic switch valve 1 is opened to connect to the external atmosphere, the air compressor 8 is turned on, and the two-position three-way valve 7 is controlled to be in the second working position. At this time, the air passages 21, 26, and 25 form a passage. The external atmosphere will enter the closed air spring control system through the first electromagnetic switch valve 1, then be pressurized by the air compressor 8, and then be adsorbed by the dryer 10. Finally, it will enter the air tank 13 through the second one-way valve 12 and the two-position three-way valve 7.

[0077] It should be noted that the impact of the air compressor 8's operating power on the entire system needs to be considered to avoid the two-position three-way valve 7 being delayed, causing the first check valve 9 with pre-tightening force to be forced open by the compressed gas.

[0078] When the closed air spring control system finishes filling the air tank, it first controls the air compressor 8 to shut down, the two-position three-way valve 7 to be in the first working position, and the two-position four-way valve 6 to be in the second working position. Then, it controls the two-position four-way valve 6 to be in the first working position and closes the first solenoid switch valve 1.

[0079] Combination Figure 2 When the closed air spring control system finishes filling the air tank, the air compressor 8 is turned off, the power supply to the two-position three-way valve 7 is disconnected to restore it to its default state, the two-position four-way valve 6 is then energized to its second position, the power supply to the two-position four-way valve 6 is then disconnected to restore it to its default state, and finally the first solenoid switch valve 1 is closed.

[0080] When the closed air spring control system inflates the air bladder 1a of the closed air spring, it controls the two-position four-way valve 6 to be in the second working position, the air compressor 8 to be turned on, and the second solenoid switch valve 2 corresponding to the closed air spring to be inflated to be turned on.

[0081] Combination Figure 2 When the closed air spring control system finishes filling the air tank, the air compressor 8 is turned off, the power supply to the two-position three-way valve 7 is disconnected to restore it to its default state, the two-position four-way valve 6 is then energized to its second position, the power supply to the two-position four-way valve 6 is then disconnected to restore it to its default state, and finally the first solenoid switch valve 1 is closed.

[0082] When the closed air spring control system finishes inflating the air bladder 1a of the closed air spring, it first controls the air compressor 8 to shut down, the second electromagnetic switch valve 2 corresponding to the closed air spring to be inflated to close, the first electromagnetic switch valve 1 to open, then controls the two-position four-way valve 6 to be in the first working position, and finally controls the first electromagnetic switch valve 1 to close.

[0083] Combination Figure 2 When the closed air spring control system finishes inflating the air bladder 1a of the closed air spring, the air compressor 8 is turned off, the second electromagnetic switch valve 2 corresponding to the closed air spring to be inflated is closed, the first electromagnetic switch valve 1 is opened, the pressure in the valve chamber of the two-position four-way valve 6 is released, the power supply to the two-position four-way valve 6 is then disconnected to put it in the default state, and finally the first electromagnetic switch valve 1 is closed.

[0084] When the closed air spring control system vents the air bladder 1a of the closed air spring, the second electromagnetic switch valve 2 corresponding to the closed air spring to be vented opens, the two-position four-way valve 6 is in the first working position, the two-position three-way valve 7 is in the first working position, and the air compressor 8 is turned on.

[0085] Combination Figure 2 When the closed air spring control system vents air from the air bladder 1a of the closed air spring, it opens the second solenoid valve 2 corresponding to the closed air spring to be vented, and turns on the air compressor 8. At this time, air passages 21, 23, 27, and 25 are connected, and the gas will enter the air compressor from the air bladder 1a to be vented through the corresponding second solenoid valve 2 and two-position four-way valve 6 for pressurization. After being output by the air compressor 8, the gas passes through the first one-way valve 9 and two-position three-way valve 7 into the air tank. Since the two-position three-way valve 7 is in the default state, air passage 26 is in the open state.

[0086] When the closed air spring control system finishes venting the airbag 1a of the closed air spring, it first controls the air compressor 8 to shut down, the second solenoid valve 2 corresponding to the closed air spring to be vented to shut down, the first solenoid valve 1 to open, and the two-position four-way valve 6 to be in the second working position. Then it controls the two-position four-way valve 6 to be in the first working position and the first solenoid valve 1 to shut down.

[0087] Combination Figure 2 When the closed air spring control system finishes venting the air bladder 1a of the closed air spring, the air compressor 8 is turned off, the second solenoid switch valve 2 corresponding to the closed air spring to be vented is closed, the first solenoid switch valve 1 is opened, and then the two-position four-way valve 6 is energized to put it in the second working position to fully release the air pressure in the valve chamber of the two-position four-way valve 6. Then the power supply to the two-position four-way valve 6 is disconnected to put it in the first working position. Finally, the first solenoid switch valve 1 is closed to cut off the connection between the closed air spring control system and the outside atmosphere.

[0088] When the closed-loop air spring control system regenerates the dryer, it controls the first electromagnetic switch valve 1 to open, the two-position four-way valve 6 to be in the second working position, and the two-position three-way valve 7 to be in the second working position.

[0089] Combination Figure 2 When the closed-loop air spring control system regenerates the dryer, the first solenoid valve 1 is opened, the two-position four-way valve 6 is energized to its second working position, and the two-position three-way valve 7 is energized to its second working position. The air passages 25, 26, 22, and 21 form a passage, and the gas flows into the outside atmosphere through the two-position three-way valve 7, the throttle valve 14, the dryer 10, the two-position four-way valve 6, and the first solenoid valve 1, while carrying away the moisture in the dryer 10, thus performing the regeneration operation on the dryer.

[0090] In some embodiments, if the closed air spring control system expels too much air from the air bladder 1a of the closed air spring after the air spring control system finishes venting, the two-position four-way valve 6 can be controlled to the second working position, forming a passage between air passages 24, 23, 22, and 21, and the gas in the air tank 13 will be compressed into the corresponding air bladder 1a by the air compressor 8. Similarly, if the closed air spring control system inflates too much air from the air bladder 1a of the closed air spring during the inflation process, the two-position four-way valve 6 can be controlled to the first working position, forming a passage between air passages 21, 23, and 27, and the gas in the air bladder 1a will be compressed into the air tank 13 by the compressor 8.

[0091] It should be noted that energizing and shutting off the two-position four-way valve 6 can relieve pressure in the valve chamber, which can prevent the valve chamber from being in a high-pressure environment continuously, and also prevent the air compressor back pressure from being too high when it is started again.

[0092] The control method for the closed air spring control system provided in this embodiment can use simple control logic to control the closed air spring control system to the corresponding working mode. Since the number of devices that need to be controlled is small, the control difficulty is reduced.

[0093] The features described in the various embodiments of this specification can be substituted for or combined with each other. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the description of the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort. Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0094] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. 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 the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0095] It should also be noted that, in this document, relational terms such as "first" and "second" are used only 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.

Claims

1. A closed-loop air spring control system, characterized in that, include: Closed-loop air spring regulating assembly, external intake and exhaust assembly, air tank and air compression drying distribution assembly; The closed air spring regulating assembly is connected to the external intake and exhaust assembly, and the connection point is connected to the air tank through the air compression and drying distribution assembly. The air compression and drying distribution assembly allows air to flow through the dryer only when the air tank is being filled and the dryer is being regenerated. The air compression drying distribution assembly includes: a two-position four-way valve, an air compressor, a dryer, a first one-way valve, a second one-way valve, a throttle valve, and a two-position three-way valve; The first valve port of the two-position four-way valve is connected to the second valve port of the two-position three-way valve, and the connection point is connected to the air storage tank; the second valve port of the two-position four-way valve is connected to the outlet of the air compressor, the inlet of the dryer, and the inlet of the first one-way valve, respectively; the third valve port of the two-position four-way valve is connected to the connection point of the closed air spring regulating assembly and the external intake and exhaust assembly; the fourth valve port of the two-position four-way valve is connected to the inlet of the air compressor. The outlet of the first check valve is connected to the second valve port of the two-position three-way valve; The outlet of the dryer is connected to the inlet of the second one-way valve and one end of the throttle valve, respectively; the outlet of the second one-way valve and the other end of the throttle valve are both connected to the third valve port of the two-position three-way valve.

2. The closed air spring control system according to claim 1, characterized in that, When the two-position four-way valve is in the first working position, the third valve port and the fourth valve port of the two-position four-way valve are connected. When the two-position four-way valve is in the second working position, the second valve port of the two-position four-way valve is connected to the third valve port of the two-position four-way valve, and the fourth valve port of the two-position four-way valve is connected to the first valve port of the two-position four-way valve. When the two-position three-way valve is in the first working position, the first valve port of the two-position three-way valve is connected to the second valve port of the two-position three-way valve. When the two-position three-way valve is in the second working position, the third valve port of the two-position three-way valve is connected to the second valve port of the two-position three-way valve.

3. The closed air spring control system according to claim 1, characterized in that, The external intake and exhaust assembly includes: a first solenoid valve, an intake and exhaust pipe, and a filter; The first valve port of the first electromagnetic switch valve is connected to the filter through the inlet and outlet pipes; The second valve port of the first electromagnetic switch valve is connected to the closed air spring regulating assembly and the air compression drying distribution assembly.

4. The closed air spring control system according to claim 3, characterized in that, The closed air spring regulating assembly includes multiple closed air spring branches, each of which is connected in parallel and shares a pressure sensor. The connection point connects the external intake and exhaust assembly and the air compression and drying distribution assembly.

5. The closed air spring control system according to claim 4, characterized in that, The closed air spring branch includes: a closed air spring and a second electromagnetic switch valve. The first valve port of the second electromagnetic switch valve is connected to the air bladder of the closed air spring. The second valve port of the second electromagnetic switch valve is connected to the external intake and exhaust assembly and the air compression and drying distribution assembly.

6. The closed air spring control system according to claim 5, characterized in that, The first electromagnetic switch valve, the second electromagnetic switch valve, the two-position four-way valve, the two-position three-way valve, the first one-way valve, the second one-way valve, and the throttle valve, along with their respective pipelines, are integrated into one unit to form an air distribution valve.

7. A control method for a closed air spring control system, characterized in that, The control method, applied to the closed air spring control system as described in any one of claims 1-6, comprises: When the closed air spring control system fills the air tank, it controls the first electromagnetic switch valve and the air compressor in the closed air spring control system to open, and the two-position three-way valve to be in the second working position. When the closed air spring control system finishes filling the air tank, it first controls the air compressor to shut down, the two-position three-way valve to the first working position, and the two-position four-way valve to the second working position. Then, it controls the two-position four-way valve to the first working position and closes the first electromagnetic switch valve. When the closed air spring control system inflates the air bladder of the closed air spring, it controls the two-position four-way valve to be in the second working position, the air compressor to be turned on, and the second electromagnetic switch valve corresponding to the closed air spring to be inflated to be turned on. When the closed air spring control system finishes inflating the air bladder of the closed air spring, it first controls the air compressor to shut down, the second electromagnetic switch valve corresponding to the closed air spring to be inflated to close, the first electromagnetic switch valve to open, then controls the two-position four-way valve to be in the first working position, and finally controls the first electromagnetic switch valve to close. When the closed air spring control system vents air from the air bladder of the closed air spring, the second electromagnetic switch valve corresponding to the closed air spring to be vented opens, the two-position four-way valve is in the first working position, the two-position three-way valve is in the first working position, and the air compressor is turned on. When the closed air spring control system finishes venting the airbag of the closed air spring, it first controls the air compressor to shut down, the second electromagnetic switch valve corresponding to the closed air spring to be vented to close, the first electromagnetic switch valve to open, and the two-position four-way valve to be in the second working position. Then it controls the two-position four-way valve to be in the first working position and the first electromagnetic switch valve to close. When the closed-loop air spring control system dryer is regenerated, it controls the first electromagnetic switch valve to open, the two-position four-way valve to be in the second working position, and the two-position three-way valve to be in the second working position.

8. The control method for the closed air spring control system according to claim 7, characterized in that, Also includes: When the closed air spring control system expels too much air from the closed air spring bladder, it controls the two-position four-way valve to the second working position.

9. The control method for the closed air spring control system according to claim 7, characterized in that, Also includes: When the closed air spring control system over-inflates the air bladder of the closed air spring, it controls the two-position four-way valve to be in the first working position.

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