Blowback air path, air suspension system and control method of air suspension system

Abstract

The invention relates to the technical field of automobile air suspensions, in particular to a blowback air circuit, an air suspension system and a control method thereof, and the blowback air circuit comprises a first air circuit, a second air circuit, a third air circuit, a fourth air circuit, a blowback electromagnetic valve and a blowback pneumatic valve; one end of the first gas circuit is connected with the high-pressure end of the dryer, and the other end is connected with the blowback electromagnetic valve; one end of the second gas circuit is connected with the blowback solenoid valve, and the other end is connected with a gas nozzle of the blowback pneumatic valve; one end of the third gas path is connected with the low-pressure end of the dryer, and the other end is connected with the blowback pneumatic valve; one end of the fourth gas path is connected with the blowback pneumatic valve. The automatic control function of an air suspension system is reserved, and the problem that when the dryer is reversely blown, a powdery drying agent enters a precise electromagnetic valve element, and consequently the electromagnetic valve element is blocked and damaged can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile air suspension, and in particular to a back-blowing air circuit, an air suspension system and a control method thereof. Background Art

[0002] The air suspension system inflates or deflates the air spring to raise or lower the vehicle body. To achieve the above functions, an air supply mechanism is required in the air suspension system.

[0003] The existing air suspension air supply mechanism mostly adopts an integrated structure. The Chinese patent with publication number CN118375586B discloses an air supply unit and an air suspension system. The air supply unit includes an air intake and exhaust module, an electrical control module, a valve body module and a motor. The air intake and exhaust module includes a shell body, a filter part, and a first drying part. The shell body is provided with an air inlet, an air outlet, an air intake chamber, an exhaust chamber and a drying chamber. Among them, the filter part is arranged in the air intake chamber, and the air inlet is connected to the air supply pipeline via the air intake chamber. The air outlet is connected to the exhaust pipeline via the exhaust chamber. The first drying part is arranged in the drying chamber, and the first drying part is connected to the high-pressure output pipeline so that the gas flowing into the high-pressure output pipeline from the high-pressure interface of the supercharging part can flow through the first drying part.

[0004] In this prior art, an air supply mechanism for an air suspension system is disclosed, and each valve and filter unit are integrated in a valve body module. When the desiccant is regenerated, the backwash gas passes through the first drying unit 261, the exhaust pipeline 23, and the exhaust valve 231 in sequence.

[0005] When the exhaust valve 231 is a solenoid valve, the powdered desiccant will enter the valve core of the solenoid valve along with the back-blowing airflow. Due to the characteristics of the solenoid valve, the valve core is relatively precise. When the powdered desiccant enters the valve core of the solenoid valve, it is easy to cause the valve core to be blocked or damaged, and the function of the solenoid valve to control the on-off of the gas path is affected. Since automatic control during air suspension is an industry development trend, when the exhaust valve 231 is a mechanical valve, the on-off of the mechanical valve cannot be controlled by electrical automation. Summary of the invention

[0006] In order to solve the problem in the prior art that the solenoid valve core is easily blocked and damaged by powdered desiccant during back-blowing of desiccant, and automatic control cannot be achieved using a mechanical valve, the purpose of the present invention is to provide a back-blowing air circuit, an air suspension system and a control method thereof.

[0007] The technical solution provided by the present invention is:

[0008] In a first aspect, a back-blowing gas circuit includes a first gas circuit, a second gas circuit, a third gas circuit, a fourth gas circuit, a back-blowing solenoid valve, and a back-blowing pneumatic valve;

[0009] One end of the first gas path is used to be connected to the high pressure end of the dryer, and the other end is connected to the back-blowing solenoid valve;

[0010] One end of the second gas circuit is connected to the back-blowing solenoid valve, and the other end is connected to the gas nozzle of the back-blowing pneumatic valve;

[0011] One end of the third gas circuit is used to connect with the low-pressure end of the dryer, and the other end is connected with the back-blowing pneumatic valve;

[0012] One end of the fourth gas path is connected to the back-blowing pneumatic valve.

[0013] In a second aspect, an air suspension system includes a compressor, a dryer, an inflation air path, and a deflation air path;

[0014] The compressor air inlet is connected to the deflation air path, and the compressor air outlet is connected to the inflation air path;

[0015] The dryer is arranged on the inflation gas path;

[0016] An inflating solenoid valve is installed on the inflating air circuit, and the inflating air circuit is connected to at least one air spring solenoid valve;

[0017] The deflation gas circuit is provided with a deflation solenoid valve, and the air spring solenoid valve is also connected to the deflation gas circuit;

[0018] The air spring solenoid valve is connected to the air spring;

[0019] It also includes the back-blowing gas path of the first aspect.

[0020] As an optional technical solution of the second aspect, the compressor air inlet is connected to an air supply circuit, and an air supply solenoid valve or an air supply check valve is installed on the air supply circuit;

[0021] A filter is also provided on the air supply circuit.

[0022] Optionally, the other end of the fourth gas circuit is connected to the gas supply circuit, and the connecting point is located between the gas supply solenoid valve and the filter, or between the gas supply one-way valve and the filter.

[0023] As an optional technical solution of the second aspect, both the inflation solenoid valve and the deflation solenoid valve are switching valves; the air storage tank is connected to the inflation solenoid valve and the deflation solenoid valve at the same time.

[0024] In a third aspect, a control method of an air suspension system includes the following working conditions:

[0025] In steady-state conditions, the air spring solenoid valve is closed, the deflation solenoid valve is switched to the air spring solenoid valve connected to the compressor air inlet, the charging solenoid valve is switched to the air spring solenoid valve connected to the compressor air outlet, and the back-blowing solenoid valve and the back-blowing pneumatic valve are both in a normally closed state;

[0026] In the ascending condition, the deflation solenoid valve is switched to connect the air tank to the compressor air inlet, the charging solenoid valve is switched to connect the compressor air outlet to the air spring solenoid valve, the compressor works, the air spring solenoid valve is opened, and the vehicle body rises;

[0027] When the vehicle is in the descending condition, the air spring solenoid valve is opened, the deflation solenoid valve is switched to the air spring solenoid valve connected to the compressor air inlet, the charging solenoid valve is switched to the air tank connected to the compressor air outlet, the compressor works, the gas enters the air tank, and the vehicle body descends;

[0028] In the regeneration condition, the air spring solenoid valve is closed, and the deflation solenoid valve is switched to the air spring solenoid valve connected to the compressor air inlet; the charging solenoid valve is switched to the air storage tank connected to the compressor outlet, the back-blowing solenoid valve is opened, the back-blowing pneumatic valve is passively switched to the open state, and the gas in the air storage tank back-blows the dryer; or, the charging solenoid valve is switched to the air spring solenoid valve connected to the compressor outlet, the back-blowing solenoid valve is opened, the back-blowing pneumatic valve is passively switched to the open state, and the gas in the circuit between the air spring solenoid valve and the charging solenoid valve back-blows the dryer;

[0029] In the air replenishment condition, the air spring solenoid valve is closed, the deflation solenoid valve is switched to the air spring solenoid valve to be connected to the compressor air inlet; the charging solenoid valve is switched to the air storage tank to be connected to the compressor air outlet, the compressor works, and the outside gas enters the compressor air inlet through the air replenishment check valve or the opened air replenishment solenoid valve, and the compressor delivers compressed gas to the air storage tank;

[0030] In the overflow condition, the air spring solenoid valve is closed, the deflation solenoid valve is switched to the air spring solenoid valve and connected to the compressor air inlet, and the inflation solenoid valve is switched to the air spring solenoid valve and connected to the compressor outlet. When the air pressure in the gas circuit is greater than the safety air pressure, the back-blow solenoid valve is opened, the back-blow pneumatic valve is passively switched to the open state, and the gas in the gas circuit is discharged.

[0031] As an optional technical solution of the second aspect, the high-pressure gas storage tank is connected to the charging air path of the high-pressure end of the dryer, and the low-pressure gas storage tank is connected to the deflation air path of the compressor air inlet.

[0032] Optionally, a sealing valve and / or a one-way valve is further provided in the gas path between the high-pressure gas storage tank and the low-pressure gas storage tank.

[0033] In a fourth aspect, a control method of an air suspension system includes the following working conditions:

[0034] In steady-state conditions, the air spring solenoid valve, the charging solenoid valve, the deflation solenoid valve, the back-blowing solenoid valve, and the back-blowing pneumatic valve are all in a closed state;

[0035] In the regeneration condition, the air spring solenoid valve, the charging solenoid valve, and the deflation solenoid valve are closed, the back-blowing solenoid valve is opened, the back-blowing pneumatic valve is passively switched to the open state, and the gas from the high-pressure gas storage tank back-blows the dryer;

[0036] In overflow conditions, when the gas line pressure is greater than the safety pressure, the back-blowing solenoid valve is opened, the back-blowing pneumatic valve is passively switched to the open state, and the gas in the gas line is discharged.

[0037] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0038] The back-blowing solenoid valve of the present invention is in a parallel gas circuit with the dryer. The back-blowing solenoid valve can be used to control the on and off of the back-blowing pneumatic valve. The pneumatic valve is actually a mechanical valve, and its valve core is not easily blocked or damaged by powdered desiccant. This not only retains the function of automatic control of the air suspension system, but also avoids the problem of powdered desiccant entering the precision solenoid valve core during back-blowing of the dryer, causing blockage or damage to the solenoid valve core. There is no need to worry about the solenoid valve being inconvenient to repair or replace after being damaged, so that the integrated air supply mechanism can be widely used. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a three-dimensional diagram of an integrated air supply mechanism in one embodiment of the present application;

[0040] Figure 2 This is an exploded view of an integrated air supply mechanism in one embodiment of the present application;

[0041] Figure 3 This is a cross-sectional view of an integrated air supply mechanism in one embodiment of the present application;

[0042] Figure 4 A cross-sectional view of a second mounting block in an embodiment of the present application;

[0043] Figure 5 A three-dimensional diagram of a first mounting block in an embodiment of the present application at a viewing angle;

[0044] Figure 6 This is a three-dimensional diagram of a first mounting block in an embodiment of the present application at another viewing angle;

[0045] Figure 7 This is a schematic diagram of an air suspension system when an air storage tank is provided in one embodiment of the present application;

[0046] Figure 8 This is a schematic diagram of an air suspension system when a high-pressure air storage tank and a low-pressure air storage tank are provided in one embodiment of the present application;

[0047] Fig. 9 This is a schematic diagram of an air suspension system when a high-pressure air storage tank and a low-pressure air storage tank are provided in another embodiment of the present application.

[0048] Explanation of the symbols in the schematic diagram:

[0049] Air spring 101, air spring solenoid valve 102, charging solenoid valve 103, deflation solenoid valve 104, air supply check valve 105, sealing valve 106, blowback solenoid valve 107, blowback pneumatic valve 108, air supply solenoid valve 109;

[0050] Gas storage tank 201, high pressure gas storage tank 202, low pressure gas storage tank 203;

[0051] A first gas path 301, a second gas path 302, a third gas path 303, and a fourth gas path 304;

[0052] Controller 401 , first mounting block 402 , air spring air nozzle 403 , straight hole 404 , second mounting block 405 , motor 406 , compressor 407 , dryer 408 , desiccant mounting cavity 409 , compressor mounting cavity 410 . DETAILED DESCRIPTION

[0053] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0054] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of implementation. The change or adjustment of their relative relationship should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0055] This application proposes an integrated gas supply mechanism, such as Figure 1-2 As shown, it includes an integrated seat and a controller 401 connected to the integrated seat. The controller 401 can be directly installed on the integrated seat, or first installed in the controller housing, and then the housing is connected to the integrated seat. The connection between the housing and the integrated seat can be a snap connection, or a bolt connection, or other connection methods in the prior art that can achieve fixing the housing and the integrated seat together, which are relatively mature in the prior art and will not be repeated or limited here.

[0056] like Figure 3As shown, a motor 406 and a compressor 407 are installed inside the integrated seat, wherein the output shaft of the motor 406 is connected to the compressor 407 in a transmission manner. When the output shaft of the motor 406 rotates, the compressor 407 can be driven to compress air. The transmission connection method between the motor 406 and the compressor 407 is relatively mature in the prior art and will not be described in detail here. The motor 406 is also electrically connected to the controller 401, and the start and stop of the motor 406 and the speed of the motor 406 can be controlled by the controller 401. This is also relatively mature in the prior art and will not be described in detail here.

[0057] The interior of the integrated seat is provided with an inflation air path, a deflation air path, and a back-blowing air path. The above-mentioned air paths can be formed by processing an air flow channel on the integrated seat and then installing various valves and air path accessories on the air flow channel. The switching and circulation of the air paths can be achieved through various valves.

[0058] Specifically, the air inlet of the compressor 407 is connected to the deflation air path, and the air outlet of the compressor 407 is connected to the inflation air path. When the motor 406 drives the compressor 407 to work, the compressor 407 can compress the gas in the deflation air path and transport it to the inflation air path.

[0059] A dryer 408 is also installed inside the integrated seat. The dryer 408 is arranged on the inflation gas path. When the gas flows in the inflation gas path, the gas flowing through the dryer 408 can be dried.

[0060] When the gas is circulated in reverse through the dryer 408, the dryer 408 can be back-flushed and regenerated.

[0061] In one embodiment, the back-blowing gas circuit includes a first gas circuit 301, a second gas circuit 302, a third gas circuit 303, a fourth gas circuit 304, a back-blowing solenoid valve 107, and a back-blowing pneumatic valve 108. Specifically, one end of the first gas circuit 301 is connected to the high-pressure end of the dryer 408, and the other end is connected to the back-blowing solenoid valve 107. One end of the second gas circuit 302 is connected to the back-blowing solenoid valve 107, and the other end is connected to the air nozzle of the back-blowing pneumatic valve 108. One end of the third gas circuit 303 is connected to the low-pressure end of the dryer 408, and the other end is connected to the back-blowing pneumatic valve 108. One end of the fourth gas circuit 304 is connected to the back-blowing pneumatic valve 108.

[0062] In this embodiment, the dryer 408 is arranged on the inflation gas path, and the dryer 408 is closer to the high-pressure end of the gas path. When back-blowing, the higher the gas pressure, the better the back-blowing effect.

[0063] In this solution, the back-blowing solenoid valve 107 can be used to control the on-off of the back-blowing pneumatic valve 108, that is, when the back-blowing solenoid valve 107 is turned on, a high-pressure gas passes through the first gas path 301, the back-blowing solenoid valve 107, and the second gas path 302 to reach the back-blowing pneumatic valve 108, and the high-pressure gas causes the valve core of the back-blowing pneumatic valve 108 to switch to a connected state. At this time, the third gas path 303 is connected to the fourth gas path 304, and the high-pressure gas of another path back-blowing the dryer 408. The back-blowing gas passes through the third gas path 303 and the back-blowing pneumatic valve 108 in sequence, and then is discharged from the fourth gas path 304. In this solution, the back-blowing solenoid valve 107 and the dryer 408 are in a parallel gas path, and the gas of the back-blowing dryer 408 will not enter the back-blowing solenoid valve 107, which can prevent the powdered desiccant from entering the precision solenoid valve core, causing the solenoid valve core to be blocked or damaged, so that there is no need to worry about the inconvenience of repairing and replacing the solenoid valve after damage, so that the integrated gas supply mechanism can be widely used. The back-blowing pneumatic valve 108 is actually a mechanical valve, and its valve core is not easily blocked or damaged by powdered desiccant. The present application can realize the on-off of the back-blowing air path by electrically and automatically controlling the back-blowing solenoid valve 107, thereby retaining the function of automatic control of the air suspension system, and at the same time, the present application can avoid the problem of the solenoid valve core being blocked or damaged by powdered desiccant.

[0064] An inflating solenoid valve 103 is installed on the inflating gas circuit, and the inflating gas circuit is connected to at least one air spring solenoid valve 102. For example, the number of air spring solenoid valves 102 can correspond to the number of air springs, or multiple air springs can be connected to the same air spring solenoid valve 102. A deflation solenoid valve 104 is installed on the deflation gas circuit, and the air spring solenoid valve 102 is also connected to the deflation gas circuit.

[0065] A plurality of air spring air nozzles 403 are installed on the integrated seat, and the air spring air nozzles 403 are connected to the air spring solenoid valve 102, and the air spring can be connected to the air spring air nozzle 403 through an air pipe. When the air spring solenoid valve 102 is switched to a connected state, the deflation solenoid valve 104 or the inflation solenoid valve 103 is switched to a state, so that the air spring is connected to the inflation air path or the deflation air path.

[0066] As an optional solution for the structure of the integrated seat, the integrated seat includes a first mounting block 402 and a second mounting block 405 connected to the first mounting block 402, wherein the controller 401 and the second mounting block 405 are respectively located on two opposite sides of the first mounting block 402. The compressor 407 can be installed in the second mounting block 405, so that the controller 401 is far away from the compressor 407, and the temperature generated by the operation of the compressor 407 is not easy to affect the controller 401.

[0067] like Figure 5-6As shown, the first mounting block 402 is provided with a straight hole 404, and the two ends of the straight hole 404 extend to the controller 401 and the second mounting block 405 respectively, and the motor 406 is installed in the straight hole 404. At this time, the motor 406 can be regarded as being installed on the same side as the controller 401. After the main body of the motor 406 or at least its output shaft passes through the first mounting block 402, the output shaft is connected to the compressor 407 in a transmission manner. Through such an arrangement, the entire height direction of the first mounting block 402 and the partial height direction of the second mounting block 405 can overlap with the axial direction of the motor 406, and the radial direction of the motor 406 also completely overlaps with the first mounting block 402. At this time, the overall size of the integrated air supply mechanism is basically determined by the controller 401, the first mounting block 402, and the second mounting block 405. The motor 406 will not increase the size of the integrated air supply mechanism, thereby making the overall size of the air supply mechanism of the present application smaller. In addition, the straight hole 404 can be located roughly in the middle of the first mounting block 402, so that the motor 406 can be arranged in the middle of the integrated air supply mechanism, the center of gravity of the integrated air supply mechanism will be more central, and when the motor 406 drives the compressor 407 to operate, the vibration generated by the air supply mechanism will be smaller, and the installation stability of the air supply mechanism will be higher.

[0068] like Figure 1 As shown, the air spring air nozzle 403 is installed on the first mounting block 402 and faces the second mounting block 405. The second mounting block 405 also leaves an escape space, and the air spring air nozzle 403 is located in the escape space. At this time, in the height direction, the air spring air nozzle 403 and the second mounting block 405 are overlapped, which is conducive to making the overall size of the air supply mechanism of the present application smaller.

[0069] The first mounting block 402 and the second mounting block 405 can be connected by bolts, and a sealing structure such as a sealing ring can be provided between the two, so that part of the gas path can be arranged in the first mounting block 402 and the other part of the gas path can be arranged in the second mounting block 405.

[0070] As an optional solution, the air inlet of the compressor 407 is connected to an air supply circuit, on which an air supply solenoid valve 109 or an air supply check valve 105 is installed, and the inlet of the air supply circuit is arranged on the first mounting block 402. The air supply solenoid valve 109 can be opened, so that gas is drawn from the atmosphere into the air circuit through the compressor 407.

[0071] Optionally, a filter is also provided on the air supply path, and the gas supplied from the atmosphere can be filtered through the filter. The filter is installed in the second installation block 405.

[0072] Regarding the arrangement of the other end of the fourth gas path 304, in one embodiment, Fig. 9As shown, the other end of the fourth gas path 304 is connected to the air supply gas path, and the connection point is located between the air supply solenoid valve 109 and the filter, or between the air supply check valve 105 and the filter. When the dryer 408 is back-blown and regenerated, the back-blowing gas can also enter the air supply gas path through the fourth gas path 304, so that the filter can be back-blown. In another embodiment, as Figure 8 As shown, the other end of the fourth gas path 304 can also be directly connected to the atmosphere. In this case, the connecting port between the fourth gas path 304 and the atmosphere can be provided on the first mounting block 402 or on the second mounting block 405 .

[0073] When the compressor 407 is installed in the second mounting block 405, the dryer 408 is also installed in the second mounting block 405. The material of the second mounting block 405 can be a metal with good thermal conductivity, such as aluminum. When the compressor 407 is working, part of the heat generated is conducted to the dryer 408 through the second mounting block 405, and the other part is dissipated through the surface of the second mounting block 405, which is beneficial to the heat dissipation of the compressor 407 and can also improve the regeneration effect of the dryer 408.

[0074] In order to improve the heat dissipation effect, heat dissipation fins may also be arranged around the second mounting block 405 .

[0075] Specifically, Figure 4 As shown, the second mounting block 405 is provided with a compressor mounting cavity 410 and a desiccant mounting cavity 409 for mounting a compressor 407 and a dryer 408, respectively. The compressor mounting cavity 410 is provided with an inlet and an outlet communicating with the deflation air path and the inflation air path. The desiccant mounting cavity 409 is also provided with an inlet and an outlet communicating with the inflation air path.

[0076] The dryer 408 includes a desiccant placed in a desiccant installation cavity 409, and a sealing cover is installed at the cavity opening of the desiccant installation cavity 409. The desiccant can be directly arranged in the second installation block 405, eliminating the housing of the external air drying device, and the heat generated by the compressor 407 conducted by the second installation block 405 can directly increase the temperature of the desiccant and improve the regeneration effect of the desiccant. In addition, the external air drying device will also increase the size of the integrated air supply mechanism, so the present solution arranges the desiccant directly in the second installation block 405, which can also reduce the size of the integrated air supply mechanism of the present application.

[0077] As an optional embodiment, there is a pair of desiccant installation chambers 409, and the pair of desiccant installation chambers 409 are respectively located on both sides of the compressor installation chamber 410. The desiccant installation chambers 409 are symmetrically distributed on both sides of the compressor installation chamber 410, so that the center of gravity of the overall structure of the second installation block 405 is roughly centered. When the compressor 407 is working, the air supply mechanism is relatively stable as a whole and is not easy to shake. In addition, the provision of a pair of desiccant installation chambers 409 is equivalent to increasing the heat dissipation area of ​​the second installation block 405, which is more conducive to the heat dissipation of the compressor 407. At the same time, the desiccant is dispersed in the two desiccant installation chambers 409, which can not only increase the total amount of desiccant, but also facilitate backflush regeneration.

[0078] The axes of the desiccant installation cavity 409 and the compressor installation cavity 410 are roughly parallel, which can further improve the stability of the air supply mechanism when the compressor 407 is working. The axes of the desiccant installation cavity 409 and the compressor installation cavity 410 are roughly perpendicular to the axial direction of the motor 406, which can avoid the air supply mechanism from being too large in height direction, making the air supply mechanism smaller in size.

[0079] As an optional implementation, the length extension direction of each valve is substantially parallel to the axial direction of the motor 406, and each valve is installed on the side of the first mounting block 402 close to the controller 401 and is electrically connected to the controller 401. Arranging various valves close to the controller 401 can prevent the temperature generated by the operation of the compressor 407 from affecting the valves.

[0080] The present application also proposes an air suspension system including the above-mentioned integrated air supply mechanism, and specifically refers to the following two embodiments: Air Suspension System Embodiment 1

[0081] In this embodiment, the present application proposes an air suspension system, including the above-mentioned integrated air supply mechanism. It also includes an air spring 101 and an air tank 201. The air spring 101 is connected to the air spring air nozzle 403 through a gas pipeline arranged on the vehicle body. The number of air spring solenoid valves 102 can correspond to the number of air springs 101, such as Figure 7 As shown. It is also possible to connect multiple air springs 101 to the same air spring solenoid valve 102.

[0082] In this solution, both the inflation solenoid valve 103 and the deflation solenoid valve 104 are switching valves, and the gas storage tank 201 is connected to both the inflation solenoid valve 103 and the deflation solenoid valve 104. The interface between the gas storage tank 201 and the inflation gas circuit and the deflation gas circuit is arranged on the first mounting block 402 or the second mounting block 405.

[0083] The inflation solenoid valve 103 and the deflation solenoid valve 104 can be a two-position three-way valve, and two two-position two-way valves can also be used to replace a two-position three-way valve. The use of multi-position multi-way valves can effectively reduce the number of solenoid valves, reduce the weight and cost of the entire system, and reduce the assembly steps. In addition, the inflation solenoid valve 103 and the deflation solenoid valve 104 also work intermittently and in rotation, and do not need to work at the same time, which can reduce the power consumption of the entire system.

[0084] The air inlet of the compressor 407 is connected to the A port of the deflation electromagnetic valve 104, the air spring electromagnetic valve 102 is connected to the T port of the deflation electromagnetic valve 104, and the air storage tank 201 is connected to the P port of the deflation electromagnetic valve 104. Conversely, the air spring electromagnetic valve 102 can also be connected to the P port of the deflation electromagnetic valve 104, and the air storage tank 201 is connected to the T port of the deflation electromagnetic valve 104.

[0085] The air outlet of the compressor 407 is connected to the A port of the charging solenoid valve 103, the air spring solenoid valve 102 is connected to the T port of the charging solenoid valve 103, and the air tank 201 is connected to the P port of the charging solenoid valve 103. Conversely, the air spring solenoid valve 102 can also be connected to the P port of the charging solenoid valve 103, and the air tank 201 is connected to the T port of the charging solenoid valve 103.

[0086] The present application also proposes a control method for an air suspension system, including the following working conditions:

[0087] In steady-state operation, the air spring solenoid valve 102 is closed, the deflation solenoid valve 104 is switched to connect the air spring solenoid valve 102 to the air inlet of the compressor 407, the inflation solenoid valve 103 is switched to connect the air spring solenoid valve 102 to the air outlet of the compressor 407, and the back-blow solenoid valve 107 and the back-blow pneumatic valve 108 are both in a normally closed state.

[0088] During the ascending condition, the deflation solenoid valve 104 is switched to the air tank 201 and connected to the air inlet of the compressor 407, and the inflation solenoid valve 103 is switched to the air outlet of the compressor 407 and connected to the air spring solenoid valve 102. The compressor 407 works, the air spring solenoid valve 102 is opened, and the vehicle body rises.

[0089] During the descending condition, the air spring solenoid valve 102 is opened, the deflation solenoid valve 104 is switched to connect the air spring solenoid valve 102 with the air inlet of the compressor 407, the inflation solenoid valve 103 is switched to connect the air tank 201 with the air outlet of the compressor 407, the compressor 407 works, the gas enters the air tank 201, and the vehicle body descends.

[0090] During the regeneration condition, the air spring solenoid valve 102 is closed, and the deflation solenoid valve 104 is switched to connect the air spring solenoid valve 102 with the air inlet of the compressor 407; the charging solenoid valve 103 is switched to connect the air tank 201 with the air outlet of the compressor 407, the back-blowing solenoid valve 107 is opened, and the back-blowing pneumatic valve 108 is passively switched to the open state, and the gas from the air tank 201 back-blows the dryer 408; or, the charging solenoid valve 103 is switched to connect the air spring solenoid valve 102 with the air outlet of the compressor 407, the back-blowing solenoid valve 107 is opened, and the back-blowing pneumatic valve 108 is passively switched to the open state, and the gas in the circuit between the air spring solenoid valve 102 and the charging solenoid valve 103 back-blows the dryer 408.

[0091] During the air replenishment condition, the air spring solenoid valve 102 is closed, and the deflation solenoid valve 104 is switched to the air spring solenoid valve 102 to connect with the air inlet of the compressor 407; the inflation solenoid valve 103 is switched to connect with the air tank 201 to the air outlet of the compressor 407, and the compressor 407 is working. The external gas enters the air inlet of the compressor 407 through the air replenishment one-way valve 105 or the opened air replenishment solenoid valve 109, and the compressor 407 delivers compressed gas to the air tank 201.

[0092] In the overflow condition, the air spring solenoid valve 102 is closed, the deflation solenoid valve 104 is switched to connect the air spring solenoid valve 102 with the air inlet of the compressor 407, and the inflation solenoid valve 103 is switched to connect the air spring solenoid valve 102 with the air outlet of the compressor 407. When the air pressure in the air circuit is greater than the safety air pressure, the back-blowing solenoid valve 107 is opened, and the back-blowing pneumatic valve 108 is passively switched to the open state, and the gas in the air circuit is discharged.

[0093] Air suspension system embodiment 2

[0094] In this embodiment, the present application proposes an air suspension system, including the above-mentioned integrated air supply mechanism. It also includes an air spring 101 and a high-pressure air tank 202 and a low-pressure air tank 203. The air spring 101 is connected to the air spring air nozzle 403 through a gas pipeline arranged on the vehicle body. The number of air spring solenoid valves 102 can correspond to the number of air springs 101, such as Figure 8-9 As shown. It is also possible to connect multiple air springs 101 to the same air spring solenoid valve 102.

[0095] The high-pressure gas storage tank 202 is connected to the charging gas path of the high-pressure end of the dryer 408, and the high-pressure end of the dryer 408 refers to the end away from the compressor 407. The low-pressure gas storage tank 203 is connected to the deflation gas path of the air inlet of the compressor 407. The connection port between the high-pressure gas storage tank 202 and the charging gas path and the connection port between the low-pressure gas storage tank 203 and the deflation gas path can be arranged on the first mounting block 402 or the second mounting block 405.

[0096] A sealing valve 106 and / or a one-way valve is also provided in the gas path between the high-pressure gas storage tank 202 and the low-pressure gas storage tank 203 to prevent gas blowby.

[0097] The present application also proposes a control method for an air suspension system, including the following working conditions:

[0098] In a steady-state condition, the air spring solenoid valve 102 , the charging solenoid valve 103 , the deflation solenoid valve 104 , the back-blowing solenoid valve 107 , and the back-blowing pneumatic valve 108 are all in a closed state.

[0099] During the regeneration condition, the air spring solenoid valve 102 , the charging solenoid valve 103 , and the deflation solenoid valve 104 are closed, the back-blowing solenoid valve 107 is opened, and the back-blowing pneumatic valve 108 is passively switched to the open state, and the gas from the high-pressure gas storage tank 202 back-blown the dryer 408 .

[0100] In the overflow condition, when the gas line pressure is greater than the safety pressure, the back-blowing solenoid valve 107 is opened, and the back-blowing pneumatic valve 108 is passively switched to the open state, and the gas in the gas line is discharged.

[0101] During the air replenishment working condition, the air spring solenoid valve 102, the charging solenoid valve 103, the deflation solenoid valve 104, and the sealing valve 106 are closed, and the compressor 407 works. The external gas enters the air inlet of the compressor 407 through the air replenishment check valve 105 or the opened air replenishment solenoid valve 109, and the compressor 407 delivers compressed gas to the high-pressure gas storage tank 202.

[0102] During the ascending condition, the charging solenoid valve 103 is opened, the deflation solenoid valve 104 is closed, and the corresponding air spring solenoid valve 102 is opened, and the gas in the high-pressure gas storage tank 202 enters the corresponding air spring 101 .

[0103] In the descending condition, the charging solenoid valve 103 is closed, the releasing solenoid valve 104 is opened, and the corresponding air spring solenoid valve 102 is opened, and the gas in the air spring 101 enters the low-pressure gas storage tank 203 .

[0104] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A back-blowing gas circuit, characterized in that: It comprises a first gas path (301), a second gas path (302), a third gas path (303), a fourth gas path (304), a back-blowing solenoid valve (107), and a back-blowing pneumatic valve (108); One end of the first gas path (301) is used to be connected to the high-pressure end of the dryer (408), and the other end is connected to the back-blowing solenoid valve (107); One end of the second gas path (302) is connected to the back-blowing electromagnetic valve (107), and the other end is connected to the gas nozzle of the back-blowing pneumatic valve (108); One end of the third gas path (303) is used to be connected to the low-pressure end of the dryer (408), and the other end is connected to the back-blowing pneumatic valve (108); One end of the fourth air path (304) is connected to the back-blowing pneumatic valve (108).

2. An air suspension system, characterized in that: It includes a compressor (407), a dryer (408), an air charging circuit, and an air discharging circuit; The air inlet of the compressor (407) is connected to the deflation air path, and the air outlet of the compressor (407) is connected to the inflation air path; The dryer (408) is arranged on the inflation air path; An inflation solenoid valve (103) is installed on the inflation air circuit, and the inflation air circuit is connected to at least one air spring solenoid valve (102); The deflation gas circuit is provided with a deflation solenoid valve (104), and the air spring solenoid valve (102) is also connected to the deflation gas circuit; The air spring solenoid valve (102) is connected to the air spring (101); It also includes the backflush gas circuit as claimed in claim 1.

3. The air suspension system according to claim 2, characterized in that: The air inlet of the compressor (407) is connected to an air supply circuit, and an air supply solenoid valve (109) or an air supply check valve (105) is installed on the air supply circuit; A filter is also provided on the air supply circuit.

4. The air suspension system according to claim 3, characterized in that: The other end of the fourth gas path (304) is connected to the gas supply path, and the connection point is located between the gas supply solenoid valve (109) and the filter, or between the gas supply check valve (105) and the filter.

5. The air suspension system according to any one of claims 2 to 4, characterized in that: The inflation solenoid valve (103) and the deflation solenoid valve (104) are both switching valves; the gas storage tank (201) is connected to both the inflation solenoid valve (103) and the deflation solenoid valve (104).

6. A control method for an air suspension system as claimed in claim 5, characterized in that: During the regeneration condition, the air spring solenoid valve (102) is closed, and the deflation solenoid valve (104) is switched to connect the air spring solenoid valve (102) to the air inlet of the compressor (407); the charging solenoid valve (103) is switched to connect the air storage tank (201) to the air outlet of the compressor (407), the back-blowing solenoid valve (107) is opened, the back-blowing pneumatic valve (108) is passively switched to an open state, and the gas in the air storage tank (201) back-blown the dryer (408); or, the charging solenoid valve (103) is switched to connect the air spring solenoid valve (102) to the air outlet of the compressor (407), the back-blowing solenoid valve (107) is opened, the back-blowing pneumatic valve (108) is passively switched to an open state, and the gas in the circuit between the air spring solenoid valve (102) and the charging solenoid valve (103) back-blown the dryer (408).

7. The control method of the air suspension system according to claim 6, characterized in that: During the ascending condition, the deflation solenoid valve (104) is switched to the air storage tank (201) to be connected to the air inlet of the compressor (407), and the inflation solenoid valve (103) is switched to the air outlet of the compressor (407) to be connected to the air spring solenoid valve (102). The compressor (407) works, the air spring solenoid valve (102) is opened, and the vehicle body rises.

8. The control method of the air suspension system according to claim 6, characterized in that: During the descending operation, the air spring solenoid valve (102) is opened, the deflation solenoid valve (104) is switched to the air spring solenoid valve (102) to be connected to the air inlet of the compressor (407), the charging solenoid valve (103) is switched to the air storage tank (201) to be connected to the air outlet of the compressor (407), the compressor (407) works, the gas enters the air storage tank (201), and the vehicle body descends.

9. The control method of the air suspension system according to claim 6, characterized in that: In steady-state operation, the air spring solenoid valve (102) is closed, the deflation solenoid valve (104) is switched to the air spring solenoid valve (102) to be connected to the air inlet of the compressor (407), the inflation solenoid valve (103) is switched to the air spring solenoid valve (102) to be connected to the air outlet of the compressor (407), and the back-blowing solenoid valve (107) and the back-blowing pneumatic valve (108) are both in a normally closed state.

10. The control method of the air suspension system according to claim 6, characterized in that: During the air replenishment operation, the air spring solenoid valve (102) is closed, and the deflation solenoid valve (104) is switched to the air spring solenoid valve (102) to be connected to the air inlet of the compressor (407); the inflation solenoid valve (103) is switched to the air storage tank (201) to be connected to the air outlet of the compressor (407), and the compressor (407) is working. External gas enters the air inlet of the compressor (407) through the air replenishment check valve (105) or the opened air replenishment solenoid valve (109), and the compressor (407) delivers compressed gas to the air storage tank (201).

11. The control method of the air suspension system according to claim 6, characterized in that: In the overflow condition, the air spring solenoid valve (102) is closed, the deflation solenoid valve (104) is switched to the air spring solenoid valve (102) and connected to the air inlet of the compressor (407), and the inflation solenoid valve (103) is switched to the air spring solenoid valve (102) and connected to the air outlet of the compressor (407). When the air pressure in the gas circuit is greater than the safety air pressure, the back-blowing solenoid valve (107) is opened, and the back-blowing pneumatic valve (108) is passively switched to the open state, and the gas in the gas circuit is discharged.

12. The air suspension system according to any one of claims 2 to 4, characterized in that: The high-pressure gas storage tank (202) is connected to the charging air path of the high-pressure end of the dryer (408), and the low-pressure gas storage tank (203) is connected to the deflation air path of the air inlet of the compressor (407).

13. The air suspension system according to claim 12, characterized in that: A sealing valve (106) and / or a one-way valve is also provided in the gas path between the high-pressure gas storage tank (202) and the low-pressure gas storage tank (203).

14. A control method for an air suspension system according to any one of claims 12 to 13, characterized in that: In a steady-state condition, the air spring solenoid valve (102), the charging solenoid valve (103), the deflation solenoid valve (104), the blowback solenoid valve (107), and the blowback pneumatic valve (108) are all in a closed state; In the regeneration condition, the air spring solenoid valve (102), the charging solenoid valve (103), and the deflation solenoid valve (104) are closed, the back-blowing solenoid valve (107) is opened, the back-blowing pneumatic valve (108) is passively switched to an open state, and the gas in the high-pressure gas storage tank (202) back-blown the dryer (408); In the overflow condition, when the gas pressure in the gas circuit is greater than the safety pressure, the back-blowing solenoid valve (107) is opened, the back-blowing pneumatic valve (108) is passively switched to the open state, and the gas in the gas circuit is discharged.

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