Closed air spring control system and control method thereof

Abstract

The invention provides a closed air spring control system and a control method thereof, and relates to the technical field of vehicle control, the closed air spring control system comprises a closed air spring adjusting assembly, an external intake and exhaust assembly, an air storage tank and an air compression drying distribution assembly; the closed type air spring adjusting assembly is connected with an external air inlet and exhaust assembly, a connecting point is connected with the air storage tank through the air compression drying distribution assembly, the air compression drying distribution assembly enables air to flow through the dryer only when the air storage tank is inflated and the dryer is regenerated, and the problem that internal circulation air cannot be completely prevented from passing through the dryer at present and cannot be recycled is solved. And the number of electromagnetic valves of a closed air spring control system can be increased by adding the electromagnetic valves on a drying path, and the control logic can be complicated.

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, and the dryer is located on the air's inevitable path during this circulation process. The regeneration of the dryer and the drying of the air present significant challenges.

[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 closed air spring control system, the air compression, drying, distribution assembly comprises 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 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 adjusting assembly and the external air inlet 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 one-way valve is connected to the second valve port of the two-position three-way valve.

[0012] The outlet of the first one-way valve is connected to the second valve port of the two-position three-way valve.

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

[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 closed air spring control system, the external air inlet and exhaust assembly comprises a first electromagnetic switch valve, an air inlet and exhaust pipe and a filter.

[0018] The first valve port of the first electromagnetic switch valve is connected to the filter through the air inlet and exhaust pipe.

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

[0020] Optionally, in the closed air spring control system, the closed air spring adjusting assembly comprises a plurality of closed air spring branches, each of the closed air spring branches is connected in parallel and shares one pressure sensor, and a connection point connects the external air inlet and exhaust assembly and the air compression, drying and distribution assembly.

[0021] Optionally, in the closed air spring control system, the closed air spring branch comprises 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 bag of the closed air spring.

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

[0024] Optionally, in the 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 one-way valve, the second one-way valve and the throttle valve, and the pipelines therebetween are integrated to form an air path distribution valve.

[0025] The second aspect of the present application discloses a control method of a closed air spring control system, which is applied to any one of the closed air spring control systems disclosed in the first aspect, and the control method comprises:

[0026] When the closed air spring control system is charging the air tank, the first electromagnetic switch valve and the air compressor in the closed air spring control system are controlled to be opened, and the two-position three-way valve is in the second working position.

[0027] When the closed air spring control system finishes charging the air tank, the air compressor is first controlled to be closed, the two-position three-way valve is in the first working position, the two-position four-way valve is in the second working position, then the two-position four-way valve is controlled to be in the first working position, and the first electromagnetic switch valve is closed.

[0028] When the closed air spring control system is charging the air bag of the closed air spring, the two-position four-way valve is controlled to be in the second working position, the air compressor is opened, and the second electromagnetic switch valve corresponding to the closed air spring to be charged is opened.

[0029] When the closed air spring control system finishes charging the air bag of the closed air spring, the air compressor is first controlled to be closed, the second electromagnetic switch valve corresponding to the closed air spring to be charged is closed, and the first electromagnetic switch valve is opened, then the two-position four-way valve is controlled to be in the first working position, and finally the first electromagnetic switch valve is closed.

[0030] When the closed air spring control system is exhausting the air bag of the closed air spring, the second electromagnetic switch valve corresponding to the closed air spring to be exhausted is opened, 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 opened.

[0031] When the closed air spring control system ends the air bag of the closed air spring, the air compressor is first controlled to be closed, the second electromagnetic switch valve corresponding to the closed air spring to be exhausted is closed, the first electromagnetic switch valve is opened, the two-position four-way valve is in the second working position, and then the two-position four-way valve is in the first working position and the first electromagnetic switch valve is closed.

[0032] When the closed air spring control system is drying the regenerator, the first electromagnetic switch valve is opened, the two-position four-way valve is in the second working position, and the two-position three-way valve is in the second working position.

[0033] Optionally, in the control method of the closed air spring control system, the method further comprises:

[0034] When the closed air spring control system exhausts the air bag of the closed air spring too much, the two-position four-way valve is controlled to be in the second working position.

[0035] Optionally, in the control method of the closed air spring control system, the method further comprises:

[0036] When the closed air spring control system exhausts the air bag of the closed air spring too much, the two-position four-way valve is controlled to be in the second working position.

[0037] The present application provides a closed air spring control system, comprising 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 to the external air inlet and exhaust assembly, the connection point is connected to the air tank through the air compression, drying and distribution assembly, and the air compression, drying and distribution assembly only allows air to flow through the regenerator when the air tank is inflated and the regenerator is regenerated, thereby solving the problem that the existing technology cannot completely avoid the internal circulation of air through the regenerator, and adding electromagnetic valves in the drying path increases the number of electromagnetic valves of the closed air spring control system and complicates the control logic. 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 following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without any creative effort.

[0039] Figure 1 A structural schematic diagram of a closed air spring control system provided for the present application is shown in the figure;

[0040] Figure 2 A structural schematic diagram of another closed air spring control system provided for the present application is shown in the figure;

[0041] The closed air spring adjusting assembly 100, the external air intake and exhaust assembly 200, the air compression, drying, distribution assembly 300, the first electromagnetic switch valve 1, the second electromagnetic switch valve 2, the two-position four-way valve 6, the two-position three-way valve 7, the air compressor 8, the first one-way valve 9, the dryer 10, the second one-way valve 12, the air tank 13, the throttle valve 14, the air bag 1a of the closed air spring, and the pressure sensor 1b. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described in the embodiments of the present application in combination with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] The present application provides a closed air spring control system and a control method thereof to solve the problem that the existing system cannot completely avoid the internal circulation of air through the dryer, and that adding electromagnetic valves in the drying path will increase the number of electromagnetic valves of the closed air spring control system and complicate the control logic.

[0044] Please refer to Figure 1 The closed air spring control system mainly includes the closed air spring adjusting assembly 100, the external air intake and exhaust assembly 200, the air tank 13, and the air compression, drying, distribution assembly 300.

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

[0046] Among them, the air compression, drying, distribution assembly 300 only allows air to flow through the dryer 10 when charging the air tank 13 through the external air intake and exhaust assembly 200, and when regenerating the dryer in the closed air spring control system.

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

[0048] In some embodiments, as shown in FIG. 1, the air compression drying distribution assembly mainly comprises 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. Figure 1

[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 adjusting assembly 100 and the external air inlet 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 application, 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 of the two-position four-way valve 6 is connected to the fourth valve port 3 of the two-position four-way valve 6; 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 of the two-position four-way valve 6, 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, when the two-position four-way valve 6 is in the first working position, it is referred to as the two-position four-way valve 6 being in the default state, that is, the position shown in FIG. 1; when the two-position four-way valve 6 is in the second working position, it is referred to as the two-position four-way valve 6 being in another state. Figure 1

[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, when the two-position three-way valve 7 is in the first working position, it is referred to as the two-position three-way valve 7 being in the default state, that is, the position shown in FIG. 1; when the two-position three-way valve 7 is in the second working position, it is referred to as the two-position three-way valve 7 being in another state. Figure 1

[0054] In some embodiments, as shown in FIG. 2, the external air inlet and exhaust assembly can comprise a first electromagnetic switch valve 1, an air inlet and exhaust pipe and a filter. Figure 1 ​​​​

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

[0056] In actual application, the air inlet and outlet 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 adjusting assembly 100 generally includes multiple closed air spring branches, each of which is connected in parallel and shares one pressure sensor 1b, and the connection point is connected to the external air inlet and outlet assembly 200 and the air compression, drying and distribution assembly 300.

[0058] In actual application, the number of closed air spring branches can be 4, that is Figure 1 The pressure sensor 1b can sense the pressure of each parallel closed air spring branch in real time.

[0059] In some embodiments, as also Figure 1 shown, the closed air spring branch can include a closed air spring and a second electromagnetic switch valve 2.

[0060] The first valve port 1 of the second electromagnetic switch valve 2 is connected to the air bag 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 air inlet and outlet assembly 200 and the air compression, drying and distribution assembly 300.

[0061] In combination Figure 2 with the closed air spring control system shown, when the closed air spring control system inflates the gas tank 13, the first electromagnetic switch valve 1 is opened to connect to the external atmosphere, the air compressor 8 is opened, and the two-position three-way valve 7 is controlled to be in the second working position. At this time, the air path 21, the air path 26 and the air path 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 through the air compressor 8, then be adsorbed by the dryer 10 to remove moisture, and then enter the gas tank 13 through the second one-way valve 12 and the two-position three-way valve 7.

[0062] In actual application, the influence of the opening power of the air compressor 8 on the entire system needs to be considered to avoid the control lag of the two-position three-way valve 7, which causes the gas compressed by the first one-way valve 9 with pre-tightening force to be opened.

[0063] When the closed air spring control system ends to inflate the gas tank 13, the air compressor 8 is turned off, the power supply state of the two-position three-way valve 7 is disconnected to restore it to the default state, the two-position four-way valve 6 is powered to be in the second position, and then the power supply of the two-position four-way valve 6 is disconnected to restore it to the default state, and finally the first electromagnetic switch valve 1 is closed.

[0064] When the closed air spring control system inflates the air bag 1a of the closed air spring, the two-position four-way valve 6 is controlled to be in the second working position (power on the two-position four-way valve 6), the air compressor 8 is opened, the second electromagnetic switch valve 2 corresponding to the closed air spring to be inflated is opened, at this time the gas path 24, the gas path 23, the gas path 22, the gas path 21 form a passage, and the gas path 27 is kept disconnected due to the existence of the first one-way valve 9. The gas in the gas tank 13 will enter the air compressor 8 for pressurization through the two-position four-way valve 6, and then enter the air bag 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 ends to inflate the air bag 1a of the closed air spring, the air compressor 8 is closed, 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 cavity of the two-position four-way valve 6 is released, then the power of the two-position four-way valve 6 is turned off, so that it is in the default state, and finally the first electromagnetic switch valve 1 is closed.

[0066] When the closed air spring control system deflates the air bag 1a of the closed air spring, the second electromagnetic switch valve 2 corresponding to the closed air spring to be deflated is opened, the air compressor 8 is opened, at this time the gas path 21, the gas path 23, the gas path 27, the gas path 25 form a passage, the gas will enter the air compressor 8 for pressurization through the corresponding second electromagnetic switch valve 2 and the two-position four-way valve 6 from the air bag 1a to be deflated, and then enter the gas tank 13 through the first one-way valve 9 and the two-position three-way valve 7 after the air compressor 8 outputs. Because the two-position three-way valve 7 is in the default state, the gas path 26 is in the disconnected state.

[0067] When the closed air spring control system ends to deflate the air bag 1a of the closed air spring, the air compressor 8 is closed, the second electromagnetic switch valve 2 corresponding to the closed air spring to be deflated is closed, the first electromagnetic switch valve 1 is opened, the two-position four-way valve 6 is powered on to be in the second working position, the gas pressure in the valve cavity of the two-position four-way valve 6 is fully released, then the power of the two-position four-way valve 6 is turned off to be in the first working position, and finally the first electromagnetic switch valve 1 is closed, cutting off the connection between the closed air spring control system and the external atmosphere.

[0068] When the closed air spring control system drier regenerates, the first electromagnetic switch valve 1 is opened, the two-position four-way valve 6 is powered on to be in the second working position, and the two-position three-way valve 7 is powered on to be in the second working position. The gas path 25, the gas path 26, the gas path 22, the gas path 21 form a passage, the gas will flow into the external atmosphere through the two-position three-way valve 7, the throttle valve 14, the drier 10, the two-position four-way valve 6 and the first electromagnetic switch valve 1, and at the same time, the moisture in the drier 10 is removed, and the drier is regenerated.

[0069] It should be noted that, in the process of ending the air exhaust of the air bag 1a of the closed air spring by the closed air spring control system, if the air exhaust of the air bag 1a of the closed air spring by the closed air spring control system is too much, the two-position four-way valve 6 can be controlled to be in the second working position, the air paths 24, 23, 22 and 21 form a passage, and the gas in the gas tank 13 can be compressed into the corresponding air bag 1a by the air compressor 8; similarly, in the process of air charging of the air bag 1a of the closed air spring by the closed air spring control system, if the air charging of the air bag 1a of the closed air spring by the closed air spring control system is too much, the two-position four-way valve 6 can be controlled to be in the first working position, the air paths 21, 23 and 27 form a passage, and the gas in the air bag 1a can be compressed into the gas tank 13 by the compressor.

[0070] It should be further noted that energizing and cutting off the two-position four-way valve 6 can release the pressure in the valve cavity of the two-position four-way valve 6, which can avoid the valve cavity being continuously in a high-pressure environment and can also avoid excessive back pressure of the air compressor 8 when starting next time.

[0071] In actual application, the first electromagnetic on-off valve 1, the second electromagnetic on-off valve 2, the two-position four-way valve 6, the two-position three-way valve 7, the first one-way valve 9, the second one-way valve 12 and the throttle valve 14, and the pipelines therebetween are integrated to form a gas path distribution valve.

[0072] The air compressor 8, the gas tank 13, the dryer 10 and the air bag 1a of the closed air spring are external elements, and the gas path distribution valve is connected with the air compressor 8, the gas tank 13 and the air bag 1a of the closed air spring in the manner shown to form the closed air spring control system. Figure 1 Or Figure 2 The air compressor 8, the gas tank 13, the dryer 10 and the air bag 1a of the closed air spring are external elements, and the gas path distribution valve is connected with the air compressor 8, the gas tank 13 and the air bag 1a of the closed air spring in the manner shown to form the closed air spring control system.

[0073] Based on the above principle, the closed air spring control system provided by the embodiment includes a closed air spring adjusting assembly 100, an external air charging and discharging assembly 200, a gas tank 13 and an air compression, drying and distribution assembly 300; the closed air spring adjusting assembly 100 is connected with the external air charging and discharging assembly 200, the connection point is connected with the gas tank 13 through the air compression, drying and distribution assembly 300, and the air compression, drying and distribution assembly 300 only makes air flow through the dryer 10 when air is charged to the gas tank 13 and the dryer is regenerated, thereby solving the problem that the existing technology cannot completely avoid the internal circulation air passing through the dryer 10 and that adding electromagnetic valves in the drying path increases the number of electromagnetic valves of the closed air spring control system and complicates the control logic.

[0074] Optionally, another embodiment of the present application further provides a control method of a closed air spring control system, which is applied to the closed air spring control system as described in any of the above embodiments, and the control method includes the following steps.

[0075] When the closed air spring control system is charging the air tank, the first electromagnetic switch valve 1 and the air compressor 8 in the closed air spring control system are controlled to be opened, and the two-position three-way valve 7 is in the second working position.

[0076] In combination Figure 2 In practice, when the closed air spring control system is charging the air tank, the first electromagnetic switch valve 1 is opened to connect the external atmosphere, the air compressor 8 is opened, and the two-position three-way valve 7 is controlled to be in the second working position. At this time, the air path 21, the air path 26, and the air path 25 form a passage. The external atmosphere enters the closed air spring control system through the first electromagnetic switch valve 1, is pressurized through the air compressor 8, is adsorbed by the desiccator 10, and then enters the air tank 13 through the second check valve 12 and the two-position three-way valve 7.

[0077] It should be noted that the opening power of the air compressor 8 should be considered to affect the entire system, so as to avoid the control lag of the two-position three-way valve 7, which causes the first check valve 9 with pre-tightening force to be compressed and opened by the gas.

[0078] When the closed air spring control system ends charging the air tank, the air compressor 8 is first controlled to be closed, the two-position three-way valve 7 is controlled to be in the first working position, the two-position four-way valve 6 is controlled to be in the second working position, and then the two-position four-way valve 6 is controlled to be in the first working position and the first electromagnetic switch valve 1 is closed.

[0079] In combination Figure 2 When the closed air spring control system ends charging the air tank, the air compressor 8 is closed, the power supply state of the two-position three-way valve 7 is disconnected to restore the default state, the two-position four-way valve 6 is powered to be in the second position, then the power supply of the two-position four-way valve 6 is disconnected to restore the default state, and finally the first electromagnetic switch valve 1 is closed.

[0080] When the closed air spring control system is charging the air bag 1a of the closed air spring, the two-position four-way valve 6 is controlled to be in the second working position, the air compressor 8 is opened, and the second electromagnetic switch valve 2 corresponding to the closed air spring to be charged is opened.

[0081] In combination Figure 2 When the closed air spring control system ends charging the air tank, the air compressor 8 is closed, the power supply state of the two-position three-way valve 7 is disconnected to restore the default state, the two-position four-way valve 6 is powered to be in the second position, then the power supply of the two-position four-way valve 6 is disconnected to restore the default state, and finally the first electromagnetic switch valve 1 is closed.

[0082] When the closed air spring control system ends to inflate the air bag 1a of the closed air spring, the air compressor 8 is controlled to be closed, the second electromagnetic switch valve 2 corresponding to the closed air spring to be inflated is controlled to be closed, and the first electromagnetic switch valve 1 is controlled to be opened. Then the two-position four-way valve 6 is controlled to be in the first working position, and finally the first electromagnetic switch valve 1 is controlled to be closed.

[0083] In combination Figure 2 When the closed air spring control system ends to inflate the air bag 1a of the closed air spring, the air compressor 8 is closed, 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, and the pressure in the valve cavity of the two-position four-way valve 6 is released. Then the power supply of the two-position four-way valve 6 is disconnected, so that it is in the default state, and finally the first electromagnetic switch valve 1 is closed.

[0084] When the closed air spring control system ends to inflate the air bag 1a of the closed air spring, the air compressor 8 is controlled to be closed, the second electromagnetic switch valve 2 corresponding to the closed air spring to be inflated is controlled to be closed, and the first electromagnetic switch valve 1 is controlled to be opened. Then the two-position four-way valve 6 is controlled to be in the first working position, and finally the first electromagnetic switch valve 1 is controlled to be closed.

[0085] In combination Figure 2 When the closed air spring control system ends to inflate the air bag 1a of the closed air spring, the air compressor 8 is closed, 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, and the pressure in the valve cavity of the two-position four-way valve 6 is released. Then the power supply of the two-position four-way valve 6 is disconnected, so that it is in the default state, and finally the first electromagnetic switch valve 1 is closed.

[0086] When the closed air spring control system ends to inflate the air bag 1a of the closed air spring, the air compressor 8 is controlled to be closed, the second electromagnetic switch valve 2 corresponding to the closed air spring to be inflated is controlled to be closed, and the first electromagnetic switch valve 1 is controlled to be opened. Then the two-position four-way valve 6 is controlled to be in the first working position, and finally the first electromagnetic switch valve 1 is controlled to be closed.

[0087] In combination Figure 2 When the closed air spring control system ends to inflate the air bag 1a of the closed air spring, the air compressor 8 is closed, 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, and the pressure in the valve cavity of the two-position four-way valve 6 is released. Then the power supply of the two-position four-way valve 6 is disconnected, so that it is in the default state, and finally the first electromagnetic switch valve 1 is closed.

[0088] When the closed air spring control system drier is regenerated, the first electromagnetic on-off valve 1 is opened, the two-position four-way valve 6 is in the second working position, and the two-position three-way valve 7 is in the second working position.

[0089] In combination ​ When the closed air spring control system drier is regenerated, the first electromagnetic on-off valve 1 is opened, the two-position four-way valve 6 is in the second working position, and the two-position three-way valve 7 is in the second working position. The gas path 25, the gas path 26, the gas path 22, and the gas path 21 form a passage, and the gas will flow into the external atmosphere through the two-position three-way valve 7, the throttle valve 14, the drier 10, the two-position four-way valve 6, and the first electromagnetic on-off valve 1, while taking away the moisture in the drier 10, thereby regenerating the drier.

[0090] In some embodiments, when the closed air spring control system ends the process of exhausting the air bag 1a of the closed air spring, if the closed air spring control system exhausts the air bag 1a of the closed air spring too much, the two-position four-way valve 6 can be controlled to be in the second working position, the gas path 24, the gas path 23, the gas path 22, and the gas path 21 form a passage, and the gas in the gas tank 13 will be compressed into the corresponding air bag 1a by the air compressor 8; similarly, when the closed air spring control system inflates the air bag 1a of the closed air spring, if the closed air spring control system inflates the air bag 1a of the closed air spring too much, the two-position four-way valve 6 can be controlled to be in the first working position, the gas path 21, the gas path 23, and the gas path 27 form a passage, and the gas in the air bag 1a will be compressed into the gas tank 13 by the compressor 8.

[0091] It should be noted that the energization and cut-off operation of the two-position four-way valve 6 can depressurize the valve cavity of the two-position four-way valve 6, which can avoid the valve cavity being continuously in a high-pressure environment and can also avoid excessive back pressure of the air compressor when starting next time.

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

[0093] The features of the various embodiments described in this specification can be combined with each other in any way. Parts of each embodiment can be interchanged with parts of other embodiments. Each embodiment is focused on the differences between itself and the other embodiments. In particular, for the system or system embodiments, since they are substantially similar to the method embodiments, they are described more simply, and reference is made to the relevant parts of the method embodiments. The systems and system embodiments described above are merely illustrative of the principles of the present embodiments. The units shown as separate components in the system can or can not be physically separate, and the components shown as units can or can not be physical units, i.e. can be located at one place or distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiments. Those skilled in the art can understand and implement without creative labor. Professionals can further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be realized in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in general terms in the above description. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0094] The above description of disclosed embodiments enables a person skilled in the art to implement or use the invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0095] It should also be noted that the relational terms herein, 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 or among the entities or operations. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a list of elements does not only include those elements, but also includes other elements not expressly listed or inherent to such process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the 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-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.

2. The closed air spring control system according to claim 1, characterized in that, 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.

3. The closed air spring control system according to claim 2, 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.

4. The closed air spring control system according to claim 2, 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.

5. The closed air spring control system according to claim 4, 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.

6. The closed air spring control system according to claim 5, 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.

7. The closed air spring control system according to claim 6, 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.

8. 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 1-7, 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.

9. The control method for the closed air spring control system according to claim 8, 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.

10. The control method for the closed air spring control system according to claim 8, 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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