Air circuit system for air suspension

Abstract

This utility model belongs to the technical field of automotive air suspension systems, specifically relating to an air circuit system for air suspension, which helps to reduce the number of solenoid valves. The air inlet is connected to the piston pump inlet via air passage a, the piston pump outlet is connected to the dryer tank inlet via air passage b, air passage c is provided at the dryer tank outlet, air passage d is connected to the quick-connect fitting of the air tank, air passage d is connected to air passage a via air passage e, air passage d is connected to air passage c via air passage f, air passage g is connected to the quick-connect fitting of the air spring, air passage g is connected to air passage a via air passage h, air passage g is connected to air passage c via air passage i, and air passage c is connected to the exhaust port via air passage j. A solenoid valve I is installed on the valve block to control the switching of air passage h and air passage i with air passage g, respectively; a solenoid valve VI is installed on the valve block to control the switching of air passage e and air passage f with air passage d, respectively; and a solenoid valve VII is installed on the valve block to control the opening and closing of air passage j.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive air suspension systems, specifically relating to an air circuit system for air suspension. Background Technology

[0002] With the development of automotive technology, air suspension systems are being used more and more widely. The core driving component of an air suspension is an air compressor pump. The air source for the air compressor pump is the atmosphere, and if moisture from the atmosphere enters the system, it will seriously affect the system's service life. Existing air suspension systems are equipped with a drying mechanism connected to the air compressor pump. This drying mechanism has both drying and regeneration capabilities to remove moisture from the atmosphere that enters the air compressor pump.

[0003] Chinese patent document CN106232398A discloses an integrated air supply unit that combines an air compressor, motor, air dryer, pneumatic valve, and electronic controller into a single functional unit. This solves the space and cost problems caused by the independent installation of components in existing air spring systems, achieving a compact, stable, and efficient air supply while reducing the risk of failure and manufacturing costs. However, the aforementioned technical solution uses a large number of solenoid valves, resulting in technical problems such as complex structure, high failure rate, and high energy consumption. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an air circuit system for air suspension that helps to reduce the number of solenoid valves.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an air circuit system for air suspension, including a valve block, wherein the valve block is provided with an air inlet and an air outlet, and an air spring assembly, an air tank, a dryer and a piston pump are installed on the valve block; the valve block is provided with an air spring quick connector and an air tank quick connector, the air spring assembly is connected to the valve block through the air spring quick connector, and the air tank is connected to the valve block through the air tank quick connector;

[0006] The air inlet is connected to the piston pump inlet via a first air passage a, the piston pump outlet is connected to the dryer tank inlet via a second air passage b, a third air passage c is provided at the dryer tank outlet, and a fourth air passage d is also provided, which is connected to the quick-connect fitting of the air storage tank. The fourth air passage d is connected to the first air passage a via a fifth air passage e, and the fourth air passage d is connected to the third air passage c via a sixth air passage f. The fourth air passage d is also provided, which is connected to the quick-connect fitting of the air spring, and a seventh air passage g is connected to the first air passage a via an eighth air passage h. The seventh air passage g is connected to the third air passage c via a ninth air passage i, and the third air passage c is connected to the exhaust port via a tenth air passage j.

[0007] The first airway a, the second airway b, the third airway c, the fourth airway d, the fifth airway e, the sixth airway f, the seventh airway g, the eighth airway h, the ninth airway i, and the tenth airway j are all disposed within the valve block; a solenoid valve I is installed on the valve block to control the switching of the eighth airway h and the ninth airway i with the seventh airway g, respectively; a solenoid valve VI is installed on the valve block to control the switching of the fifth airway e and the sixth airway f with the fourth airway d, respectively; and a solenoid valve VII is installed on the valve block to control the opening and closing of the tenth airway j.

[0008] Furthermore, both solenoid valve I and solenoid valve VI are two-position three-way solenoid valves.

[0009] Furthermore, an ECU assembly is provided at the bottom of the valve block, and the piston pump motor, solenoid valve I, solenoid valve VI, and solenoid valve VII are all electrically connected to the PCB board of the ECU assembly.

[0010] Furthermore, it also includes an intake check valve, a piston pump check valve, and a gas tank check valve installed on the valve block;

[0011] The intake check valve is connected to the first air passage a and is located between the intake port and the piston pump inlet to control the unidirectional flow of air from the intake port to the piston pump inlet.

[0012] The piston pump check valve is connected to the second air passage b and is located between the piston pump outlet and the dryer tank inlet to control the unidirectional flow of air from the piston pump outlet to the dryer tank inlet.

[0013] The one-way valve of the gas storage tank is connected to the sixth air passage f to control the unidirectional flow of air from the outlet of the drying tank to the gas storage tank.

[0014] Furthermore, it also includes an overflow valve installed on the valve block, the piston pump and the piston pump check valve are combined to form a piston pump module, the overflow valve and the piston pump module are connected in parallel through an air passage branch, and the air passage branch is located inside the valve block.

[0015] Furthermore, it also includes an air filter installed on the valve block, the air filter being connected to the first air passage a and located between the air inlet and the air inlet check valve.

[0016] Furthermore, it also includes a one-way throttle valve installed on the valve block, which is connected to the third air passage c to control the amount of air flowing unidirectionally from the outlet of the drying tank to the rear end.

[0017] Furthermore, it also includes a muffler installed on the valve block, the muffler being located at the exhaust port.

[0018] An air circuit system for air suspension includes a valve block with an air inlet and an air outlet. The valve block is equipped with an air spring assembly, an air tank, a dryer, and a piston pump. The valve block is provided with an air spring quick-connect fitting and an air tank quick-connect fitting. The air spring assembly is connected to the valve block via the air spring quick-connect fitting, and the air tank is connected to the valve block via the air tank quick-connect fitting.

[0019] The air inlet is connected to the piston pump inlet via a first air passage a, the piston pump outlet is connected to the dryer tank inlet via a second air passage b, a third air passage c is provided at the dryer tank outlet, and a fourth air passage d is also provided, which is connected to the quick-connect fitting of the air storage tank. The fourth air passage d is connected to the first air passage a via an eleventh air passage k, and the fourth air passage d is connected to the third air passage c via a twelfth air passage m. The fourth air passage d is also provided, which is connected to the quick-connect fitting of the air spring, and a seventh air passage g is connected to the first air passage a via an eighth air passage h. The seventh air passage g is connected to the third air passage c via a twelfth air passage m, and the third air passage c is connected to the exhaust port via a tenth air passage j.

[0020] The first airway a, the second airway b, the third airway c, the fourth airway d, the seventh airway g, the eighth airway h, the tenth airway j, the eleventh airway k, and the twelfth airway m are all disposed within the valve block; a solenoid valve I is installed on the valve block to control the switching of the eighth airway h, the eleventh airway k, the twelfth airway m, the seventh airway g, and the fourth airway d; a solenoid valve VI is installed on the valve block to control the switching of the fourth airway d; and a solenoid valve VII is installed on the valve block to control the switching of the tenth airway j.

[0021] Furthermore, the solenoid valve I is a three-position five-way solenoid valve, and the solenoid valve VI is a two-position two-way solenoid valve.

[0022] Compared with existing technologies, the beneficial effects of this invention are: This invention provides an air circuit system for air suspension, which helps to reduce the number of solenoid valves. By improving the air passage arrangement, the number of solenoid valves is effectively reduced. It also has advantages such as reduced failure rate and reduced energy consumption. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the valve block, ECU assembly, motor, air spring quick connector and drying tank in this utility model;

[0024] Figure 2 This is a schematic diagram showing the arrangement of the ECU connector, the air spring quick-connect fitting, the motor, the air tank quick-connect fitting, the air inlet, the air outlet, and the dryer in this utility model.

[0025] Figure 3 This is a schematic diagram of the principle when both solenoid valve I and solenoid valve VI are two-position three-way solenoid valves in this utility model;

[0026] Figure 4 This is a schematic diagram of the principle when solenoid valve I is a two-position three-way solenoid valve and solenoid valve VI is a three-position three-way solenoid valve in this utility model.

[0027] Figure 5 This is a schematic diagram of the principle when solenoid valve I is a three-position five-way solenoid valve and solenoid valve VI is a two-position two-way solenoid valve in this utility model.

[0028] Reference numerals: 1-ECU component; 2-valve block; 3-intake port; 4-exhaust port; 5-spring quick-connect fitting; 6-motor; 7-air tank quick-connect fitting; 8-drier canister; 9-PCB board; 10-housing; 11-piston pump check valve; 12-ECU connector; 13-piston pump; 15-air filter; 16-intake check valve; 17-solenoid valve I; 18-solenoid valve II; 19-solenoid valve III; 20- Solenoid valve IV; 21-Solenoid valve V; 22-Pressure sensor; 23-First air spring; 24-Second air spring; 25-Third air spring; 26-Fourth air spring; 27-Air tank; 28-Solenoid valve VI; 29-Air tank check valve; 30-Solenoid valve VII; 31-Silencer; 32-Temperature / humidity sensor; 33-One-way throttle valve; 34-Relay; 35-Resistance wire; 36-Manual exhaust valve; 37-Relief valve. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] An air circuit system for air suspension includes a valve block 2, which has an air inlet 3 and an air outlet 4. The valve block 2 is equipped with an air spring assembly, an air tank 27, a dryer 8, and a piston pump 13. The valve block 2 has a quick-connect fitting 5 for the air spring and a quick-connect fitting 7 for the air tank. The air spring assembly is connected to the valve block 2 via the quick-connect fitting 5, and the air tank 27 is connected to the valve block 2 via the quick-connect fitting 7. The air inlet 3 is connected to the inlet of the piston pump 13 via a first air passage a. The outlet of the piston pump 13 is connected to the inlet of the dryer 8 via a second air passage b. A third air passage c is provided at the outlet of the dryer 8. The system also includes a fourth air passage d connected to the quick-connect fitting 7, which is connected to the first air passage a via a fifth air passage e. The fourth air passage d is connected to the third air passage c via a sixth air passage f. Finally, the system includes a seventh air passage connected to the quick-connect fitting 5. The seventh air passage g is connected to the first air passage a via the eighth air passage h, the seventh air passage g is connected to the third air passage c via the ninth air passage i, and the third air passage c is connected to the exhaust port 4 via the tenth air passage j. The first air passage a, the second air passage b, the third air passage c, the fourth air passage d, the fifth air passage e, the sixth air passage f, the seventh air passage g, the eighth air passage h, the ninth air passage i, and the tenth air passage j are all located within the valve block 2. The valve block 2 is equipped with a solenoid valve I 17 to control the switching of the eighth air passage h and the ninth air passage i with the seventh air passage g. The valve block 2 is also equipped with a solenoid valve VI 28 to control the switching of the fifth air passage e and the sixth air passage f with the fourth air passage d. The valve block 2 is further equipped with a solenoid valve VII 30 to control the opening and closing of the tenth air passage j.

[0031] Specifically, such as Figure 3 As shown, both solenoid valve I17 and solenoid valve VI28 are two-position three-way solenoid valves.

[0032] Specifically, such as Figure 4 As shown, solenoid valve I17 is a two-position three-way solenoid valve, and solenoid valve VI28 is a three-position three-way solenoid valve.

[0033] Specifically, the air spring assembly is installed on the valve block 2 via the air spring quick connector 5. The air spring assembly includes a first air spring 23, a second air spring 24, a third air spring 25, and a fourth air spring 26. The first air spring 23 connects or disconnects from the seventh air passage g via solenoid valve II 18. The second air spring 24 connects or disconnects from the seventh air passage g via solenoid valve III 19. The third air spring 25 connects or disconnects from the seventh air passage g via solenoid valve IV 20. The fourth air spring 26 connects or disconnects from the seventh air passage g via solenoid valve V 21.

[0034] Preferably, an ECU assembly 1 is disposed at the bottom of the valve block 2, and the motor 6, solenoid valve I 17, solenoid valve VI 28, and solenoid valve VII 30 of the piston pump 13 are all electrically connected to the PCB board 9 of the ECU assembly 1. Specifically, the ECU assembly 1 includes a housing 10 connected to the bottom of the valve block 2, a PCB board 9 disposed inside the housing 10, and an ECU connector 12 disposed on the housing 10 and located on one side of the valve block 2. The ECU connector 12 is electrically connected to the PCB board 9. The motor 6, solenoid valve I 17, solenoid valve VI 28, solenoid valve VII 30, solenoid valve II 18, solenoid valve III 19, solenoid valve IV 20, and solenoid valve V 21 of the piston pump 13 are all electrically connected to the PCB board 9. ECU refers to Electronic Control Unit, and PCB board refers to Printed Circuit Board.

[0035] Preferably, the system further includes an intake check valve 16, a piston pump check valve 11, and a storage tank check valve 29 installed on the valve block 2. The intake check valve 16 is connected to the first air passage a and is located between the air inlet 3 and the piston pump 13 inlet to control the unidirectional flow of air from the air inlet 3 to the piston pump 13 inlet. The piston pump check valve 11 is connected to the second air passage b and is located between the piston pump 13 outlet and the drying tank 8 inlet to control the unidirectional flow of air from the piston pump 13 outlet to the drying tank 8 inlet. The storage tank check valve 29 is connected to the sixth air passage f to control the unidirectional flow of air from the drying tank 8 outlet to the storage tank 27.

[0036] Preferably, the system also includes an overflow valve 37 mounted on the valve block 2. The piston pump 13 and the piston pump check valve 11 are combined to form a piston pump module. The overflow valve 37 and the piston pump module are connected in parallel through an air passage branch 3701, which is located within the valve block 2. The overflow valve 37 serves to stabilize pressure and overflow.

[0037] Preferably, the system further includes an air filter 15 installed on the valve block 2. The air filter 15 is connected to the first air passage a and is located between the air inlet 3 and the one-way air inlet valve 16. By providing the air filter 15, impurities are prevented from entering the air passage within the valve block 2.

[0038] Preferably, it also includes a one-way throttle valve 33 installed on the valve block 2, the one-way throttle valve 33 being connected to the third air passage c to control the amount of air flowing unidirectionally from the outlet of the drying tank 8 to the rear end.

[0039] Preferably, it also includes an electrically connected resistance wire 35 and a relay 34. The resistance wire 35 is wound around the outer shell of the drying tank 8, and the relay 34 is used to control the delayed energization of the resistance wire 35 so that the drying tank 8 is heated when the resistance wire 35 is energized.

[0040] Preferably, it also includes a manual vent valve 36 installed on the valve block 2, which is connected to the second air passage b. This is used to depressurize the system during maintenance and disassembly.

[0041] Preferably, the system also includes a muffler 31 mounted on the valve block 2, the muffler 31 being located at the exhaust port 4. By providing the muffler 31, noise is avoided during exhaust. As a further preferred embodiment, the muffler 31 is a throttling muffler.

[0042] Preferably, it also includes a pressure sensor 22 mounted on the valve block 2, with the connection point of the pressure sensor 22 located on the seventh air passage g. It is used to detect the pressure of the air spring and the air tank 27.

[0043] Preferably, it also includes a temperature / humidity sensor 32 mounted on the valve block 2, with the connection of the temperature / humidity sensor 32 located on the third air passage c.

[0044] The specific work process is as follows:

[0045] Table 1

[0046]

[0047] Table 1 shows the operating logic when both solenoid valve I17 and solenoid valve VI28 are two-position three-way solenoid valves. O indicates disconnection, and - indicates connection.

[0048] Including the following 9 operating conditions:

[0049] In operating condition 1, when atmospheric air fills the air spring, the motor 6 of piston pump 13 is connected, solenoid valve I 17 is disconnected, solenoid valves II 18, III 19, IV 20 and / or V 21 are connected, and solenoid valves VI 28, VII 30 and relay 34 are disconnected. This forms an air path structure of "inlet 3 - first air passage a - piston pump 13 - second air passage b - dryer 8 - third air passage c - ninth air passage i - seventh air passage g - air spring".

[0050] In operating condition 2, when atmospheric air fills the gas storage tank 27, the motor 6 of the piston pump 13 is connected, and solenoid valves I 17, II 18, III 19, IV 20, V 21, VI 28, VII 30 and relay 34 are all disconnected. This forms a gas path structure of "air inlet 3 - first air passage a - piston pump 13 - second air passage b - dryer tank 8 - third air passage c - sixth air passage f - fourth air passage d - gas storage tank 27".

[0051] In operating condition 3, when the gas tank 27 is filling the air spring, the motor 6 of the piston pump 13 is connected, solenoid valve I 17 is disconnected, and solenoid valves II 18, III 19, IV 20, V 21 and / or VI 28 are connected. Solenoid valve VII 30 and relay 34 are both disconnected. This forms a gas path structure of "gas tank 27 - fourth gas passage d - fifth gas passage e - first gas passage a - piston pump 13 - second gas passage b - dryer 8 - third gas passage c - ninth gas passage i - seventh gas passage g - air spring".

[0052] In operating condition 4, when the air spring is filling the air tank 27, the motor 6 of the piston pump 13, solenoid valves I, II, III, IV, and / or V are connected, while solenoid valves VI, VII, and 34 and relay 34 are disconnected. This forms an air path structure of "air spring - seventh air passage g - eighth air passage h - first air passage a - piston pump 13 - second air passage b - dryer 8 - third air passage c - sixth air passage f - fourth air passage d - air tank 27".

[0053] In operating condition 5, when the air spring exhausts gas to the atmosphere, the motor 6 of the piston pump 13 is disconnected, solenoid valves I 17, II 18, III 19, IV 20 and / or V 21 are connected, solenoid valve VI 28 is disconnected, solenoid valve VII 30 is connected, and relay 34 is disconnected. This forms an air path structure of "air spring - seventh air passage g - eighth air passage h - first air passage a - piston pump 13 - second air passage b - dryer 8 - third air passage c - tenth air passage j - exhaust port 4".

[0054] In operating condition 6, when the gas storage tank 27 exhausts gas to the atmosphere, the motor 6 of the piston pump 13, solenoid valves I 17, II 18, III 19, IV 20, and V 21 are all disconnected, while solenoid valves VI 28 and VII 30 are connected, and relay 34 is disconnected. This forms a gas path structure of "gas storage tank 27 - fourth gas passage d - fifth gas passage e - first gas passage a - piston pump 13 - second gas passage b - dryer tank 8 - third gas passage c - tenth gas passage j - exhaust port 4".

[0055] In operating condition 7, when detecting the air pressure in the air tank 27, the motor 6 of the piston pump 13 is disconnected, solenoid valve I 17 is connected, solenoid valves II 18, III 19, IV 20, and V 21 are all disconnected, solenoid valve VI 28 is connected, and solenoid valve VII 30 and relay 34 are both disconnected. This forms an air path structure of "air tank 27 - fourth air passage d - fifth air passage e - eighth air passage h - seventh air passage g - pressure sensor 22".

[0056] In operating condition 8, when detecting the air pressure of the air spring, the motor 6 of the piston pump 13 and solenoid valve I 17 are both disconnected, while solenoid valves II 18, III 19, IV 20 or V 21 are connected, and solenoid valves VI 28, VII 30 and relay 34 are all disconnected. This forms an air path structure of "air spring - seventh air passage g - pressure sensor 22".

[0057] In operating condition 9, when the dryer tank 8 is regenerating, the motor 6 of the piston pump 13 is connected, and solenoid valves I 17, II 18, III 19, IV 20, V 21, and VI 28 are all disconnected, while solenoid valve VII 30 and relay 34 are connected. This forms an air path structure of "inlet 3 - first air passage a - piston pump 13 - second air passage b - dryer tank 8 - third air passage c - tenth air passage j - exhaust port 4".

[0058] Table 2

[0059]

[0060] Table 2 illustrates the operating logic when solenoid valve I17 is a two-position three-way solenoid valve and solenoid valve VI28 is a three-position three-way solenoid valve. O represents off, and - represents on. Table 2 is based on Table 1, replacing solenoid valve VI28 of the two-position three-way solenoid valve in Table 1 with solenoid valve VI28 of the three-position three-way solenoid valve. By controlling the on / off state of solenoid valve VI28 and solenoid valve VI28 of the three-position three-way solenoid valve, the switching control of the air path on / off is achieved.

[0061] like Figure 5As shown, the air circuit system for air suspension includes a valve block 2, which has an air inlet 3 and an air outlet 4. The valve block 2 is equipped with an air spring assembly, an air tank 27, a dryer 8, and a piston pump 13. The valve block 2 has an air spring quick-connect fitting 5 and an air tank quick-connect fitting 7. The air spring assembly is connected to the valve block 2 via the air spring quick-connect fitting 5, and the air tank 27 is connected to the valve block 2 via the air tank quick-connect fitting 7. The air inlet 3 is connected to the inlet of the piston pump 13 via a first air passage a. The outlet of the piston pump 13 is connected to the inlet of the dryer 8 via a second air passage b. A third air passage c is provided at the outlet of the dryer 8. The system also includes a fourth air passage d connected to the air tank quick-connect fitting 7. The fourth air passage d is connected to the first air passage a via an eleventh air passage k, and the fourth air passage d is connected to the third air passage c via a twelfth air passage m. The system also includes a quick-connect fitting 5 connected to the air spring assembly. The seventh air passage g is arranged accordingly. The seventh air passage g is connected to the first air passage a through the eighth air passage h. The seventh air passage g is connected to the third air passage c through the twelfth air passage m. The third air passage c is connected to the exhaust port 4 through the tenth air passage j. The first air passage a, the second air passage b, the third air passage c, the fourth air passage d, the seventh air passage g, the eighth air passage h, the tenth air passage j, the eleventh air passage k, and the twelfth air passage m are all located in the valve block 2. The valve block 2 is equipped with a solenoid valve I 17 to control the switching of the eighth air passage h, the eleventh air passage k, the twelfth air passage m, the seventh air passage g, and the fourth air passage d. The valve block 2 is equipped with a solenoid valve VI 28 to control the switching of the fourth air passage d. The valve block 2 is equipped with a solenoid valve VII 30 to control the switching of the tenth air passage j.

[0062] Preferably, the solenoid valve I17 is a three-position five-way solenoid valve, and the solenoid valve VI28 is a two-position two-way solenoid valve.

[0063] Specifically, the air spring assembly is installed on the valve block 2 via the air spring quick connector 5. The air spring assembly includes a first air spring 23, a second air spring 24, a third air spring 25, and a fourth air spring 26. The first air spring 23 connects or disconnects from the seventh air passage g via solenoid valve II 18. The second air spring 24 connects or disconnects from the seventh air passage g via solenoid valve III 19. The third air spring 25 connects or disconnects from the seventh air passage g via solenoid valve IV 20. The fourth air spring 26 connects or disconnects from the seventh air passage g via solenoid valve V 21.

[0064] Preferably, an ECU assembly 1 is disposed at the bottom of the valve block 2, and the motor 6, solenoid valve I 17, solenoid valve VI 28, and solenoid valve VII 30 of the piston pump 13 are all electrically connected to the PCB board 9 of the ECU assembly 1. Specifically, the ECU assembly 1 includes a housing 10 connected to the bottom of the valve block 2, a PCB board 9 disposed inside the housing 10, and an ECU connector 12 disposed on the housing 10. The ECU connector 12 is electrically connected to the PCB board 9. The motor 6, solenoid valve I 17, solenoid valve VI 28, solenoid valve VII 30, solenoid valve II 18, solenoid valve III 19, solenoid valve IV 20, and solenoid valve V 21 of the piston pump 13 are all electrically connected to the PCB board 9. ECU refers to Electronic Control Unit, and PCB board refers to Printed Circuit Board.

[0065] Preferably, the system further includes an intake check valve 16, a piston pump check valve 11, and a storage tank check valve 29 installed on the valve block 2. The intake check valve 16 is connected to the first air passage a and is located between the air inlet 3 and the piston pump 13 inlet to control the unidirectional flow of air from the air inlet 3 to the piston pump 13 inlet. The piston pump check valve 11 is connected to the second air passage b and is located between the piston pump 13 outlet and the drying tank 8 inlet to control the unidirectional flow of air from the piston pump 13 outlet to the drying tank 8 inlet. The storage tank check valve 29 is connected to the sixth air passage f to control the unidirectional flow of air from the drying tank 8 outlet to the storage tank 27.

[0066] Preferably, the system also includes an overflow valve 37 mounted on the valve block 2. The piston pump 13 and the piston pump check valve 11 are combined to form a piston pump module. The overflow valve 37 and the piston pump module are connected in parallel through an air passage branch 3701, which is located within the valve block 2. The overflow valve 37 serves to stabilize pressure and overflow.

[0067] Preferably, the system further includes an air filter 15 installed on the valve block 2. The air filter 15 is connected to the first air passage a and is located between the air inlet 3 and the one-way air inlet valve 16. By providing the air filter 15, impurities are prevented from entering the air passage within the valve block 2.

[0068] Preferably, it also includes a one-way throttle valve 33 installed on the valve block 2, the one-way throttle valve 33 being connected to the third air passage c to control the amount of air flowing unidirectionally from the outlet of the drying tank 8 to the rear end.

[0069] Preferably, it also includes an electrically connected resistance wire 35 and a relay 34. The resistance wire 35 is wound around the outer shell of the drying tank 8, and the relay 34 is used to control the delayed energization of the resistance wire 35 so that the drying tank 8 is heated when the resistance wire 35 is energized.

[0070] Preferably, it also includes a manual vent valve 36 installed on the valve block 2, which is connected to the second air passage b. This is used to depressurize the system during maintenance and disassembly.

[0071] Preferably, the system also includes a muffler 31 mounted on the valve block 2, the muffler 31 being located at the exhaust port 4. By providing the muffler 31, noise is avoided during exhaust. As a further preferred embodiment, the muffler 31 is a throttling muffler.

[0072] Preferably, it also includes a pressure sensor 22 mounted on the valve block 2, with the connection point of the pressure sensor 22 located on the seventh air passage g. It is used to detect the pressure of the air spring and the air tank 27.

[0073] Preferably, it also includes a temperature / humidity sensor 32 mounted on the valve block 2, with the connection of the temperature / humidity sensor 32 located on the third air passage c.

[0074] The specific work process is as follows:

[0075] Table 3

[0076]

[0077] Table 3 illustrates the operating logic when solenoid valve I17 is a three-position five-way solenoid valve and solenoid valve VI28 is a two-position two-way solenoid valve. Where 0 represents disconnection and - represents connection.

[0078] Including the following 9 operating conditions:

[0079] In operating condition 1, when the air spring is filled with air, the motor 6 of piston pump 13 is connected, the upper solenoid valve I 17 is connected, the lower solenoid valve I 17 is disconnected, solenoid valves II 18, III 19, IV 20 and / or V 21 are connected, and solenoid valves VI 28, VII 30 and relay 34 are disconnected. This forms an air path structure of "air inlet 3 - first air passage a - piston pump 13 - second air passage b - dryer 8 - third air passage c - twelfth air passage m - seventh air passage g - air spring".

[0080] In operating condition 2, when atmospheric air fills the gas storage tank 27, the motor 6 of the piston pump 13 is connected, the upper solenoid valve I 17 is disconnected, the lower solenoid valve I 17 is connected, solenoid valves II 18, III 19, IV 20, and V 21 are all disconnected, solenoid valve VI 28 is connected, and solenoid valve VII 30 and relay 34 are both disconnected. This forms a gas path structure of "inlet 3 - first air passage a - piston pump 13 - second air passage b - dryer 8 - third air passage c - twelfth air passage m - fourth air passage d - gas storage tank 27".

[0081] In operating condition 3, when the air tank 27 is filling the air spring, the motor 6 of the piston pump 13 is connected, the upper part of solenoid valve I 17 is connected, the lower part of solenoid valve I 17 is disconnected, and solenoid valves II 18, III 19, IV 20, V 21 and / or VI 28 are connected. Solenoid valve VII 30 and relay 34 are both disconnected. This forms an air path structure of "air tank 27 - fourth air passage d - eleventh air passage k - first air passage a - piston pump 13 - second air passage b - dryer 8 - third air passage c - twelfth air passage m - seventh air passage g - air spring".

[0082] In operating condition 4, when the air spring is filling the air tank 27, the motor 6 of the piston pump 13 is connected, the upper solenoid valve I 17 is disconnected, the lower solenoid valve I 17 is connected, and solenoid valves II 18, III 19, IV 20, V 21 and / or VI 28 are connected. Solenoid valve VII 30 and relay 34 are both disconnected. This forms an air path structure of "air spring - seventh air passage g - eighth air passage h - first air passage a - piston pump 13 - second air passage b - dryer 8 - third air passage c - twelfth air passage m - fourth air passage d - air tank 27".

[0083] In operating condition 5, when the air spring exhausts gas to the atmosphere, the motor 6 of piston pump 13 is disconnected, the upper solenoid valve I 17 is disconnected, the lower solenoid valve I 17 is connected, solenoid valves II 18, III 19, IV 20 and / or V 21 are connected, solenoid valve VI 28 is disconnected, solenoid valve VII 30 is connected, and relay 34 is disconnected. This forms an air path structure of "air spring - seventh air passage g - eighth air passage h - first air passage a - piston pump 13 - second air passage b - dryer 8 - third air passage c - tenth air passage j - exhaust port 4".

[0084] In operating condition 6, when the gas storage tank 27 exhausts gas to the atmosphere, the motor 6 of the piston pump 13 is disconnected, the upper solenoid valve I 17 is connected, and the lower solenoid valve I 17, solenoid valves II 18, III 19, IV 20, and V 21 are all disconnected. Solenoid valves VI 28 and VII 30 are connected, and relay 34 is disconnected. This forms a gas path structure of "gas storage tank 27 - fourth gas passage d - eleventh gas passage k - first gas passage a - piston pump 13 - second gas passage b - dryer tank 8 - third gas passage c - tenth gas passage j - exhaust port 4".

[0085] In operating condition 7, when detecting the air pressure in the air tank 27, the motor 6 of the piston pump 13 is disconnected, the upper solenoid valve I 17 is connected, and the lower solenoid valve I 17, solenoid valves II 18, III 19, IV 20, and V 21 are all disconnected. Solenoid valve VI 28 is connected, and solenoid valve VII 30 and relay 34 are both disconnected. This forms an air path structure of "air tank 27 - fourth air passage d - eleventh air passage k - eighth air passage h - seventh air passage g - pressure sensor 22".

[0086] In operating condition 8, when detecting the air pressure of the air spring, the motor 6 of piston pump 13, the upper and lower solenoid valves I and I17 are all disconnected, while solenoid valves II and III, IV and V are connected, and solenoid valves VI and VII and relay 34 are all disconnected. This forms an air path structure of "air spring - seventh air passage g - pressure sensor 22".

[0087] In operating condition 9, when the dryer tank 8 is regenerating, the motor 6 of the piston pump 13 is connected, and the upper and lower solenoid valves I17, II18, III19, IV20, V21, and VI28 are all disconnected, while solenoid valve VII30 and relay 34 are connected. This forms an air path structure of "inlet 3 - first air passage a - piston pump 13 - second air passage b - dryer tank 8 - third air passage c - tenth air passage j - exhaust port 4".

[0088] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. All equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. An air circuit system for air suspension, characterized in that, The system includes a valve block (2), which is provided with an air inlet (3) and an exhaust outlet (4). The valve block (2) is equipped with a spring assembly, an air tank (27), a dryer (8), and a piston pump (13). The valve block (2) is provided with a spring quick-connect fitting (5) and an air tank quick-connect fitting (7). The spring assembly is connected to the valve block (2) through the spring quick-connect fitting (5), and the air tank (27) is connected to the valve block (2) through the air tank quick-connect fitting (7). The air inlet (3) is connected to the inlet of the piston pump (13) through the first air passage (a), the outlet of the piston pump (13) is connected to the inlet of the dryer (8) through the second air passage (b), the outlet of the dryer (8) is provided with a third air passage (c), and also includes a fourth air passage (d) connected to the quick-connect fitting (7) of the air storage tank. The fourth air passage (d) is connected to the first air passage (a) through the fifth air passage (e), the fourth air passage (d) is connected to the third air passage (c) through the sixth air passage (f), and also includes a seventh air passage (g) connected to the quick-connect fitting (5) of the air spring. The seventh air passage (g) is connected to the first air passage (a) through the eighth air passage (h), the seventh air passage (g) is connected to the third air passage (c) through the ninth air passage (i), and the third air passage (c) is connected to the exhaust port (4) through the tenth air passage (j). The first air passage (a), the second air passage (b), the third air passage (c), the fourth air passage (d), the fifth air passage (e), the sixth air passage (f), the seventh air passage (g), the eighth air passage (h), the ninth air passage (i), and the tenth air passage (j) are all located within the valve block (2); a solenoid valve I (17) is installed on the valve block (2) to control the switching of the eighth air passage (h) and the ninth air passage (i) with the seventh air passage (g) respectively; a solenoid valve VI (28) is installed on the valve block (2) to control the switching of the fifth air passage (e) and the sixth air passage (f) with the fourth air passage (d) respectively; a solenoid valve VII (30) is installed on the valve block (2) to control the opening and closing of the tenth air passage (j) respectively.

2. The air circuit system for air suspension as described in claim 1, characterized in that, Both solenoid valve I (17) and solenoid valve VI (28) are two-position three-way solenoid valves.

3. The air circuit system for air suspension as described in claim 1, characterized in that, The bottom of the valve block (2) is provided with an ECU assembly (1). The motor (6), solenoid valve I (17), solenoid valve VI (28) and solenoid valve VII (30) of the piston pump (13) are all electrically connected to the PCB board (9) of the ECU assembly (1).

4. The air circuit system for air suspension as described in claim 1, characterized in that, It also includes an intake check valve (16), a piston pump check valve (11) and a gas storage tank check valve (29) installed on the valve block (2). The one-way valve (16) is connected to the first air passage (a) and is located between the air inlet (3) and the inlet of the piston pump (13) to control the unidirectional flow of air from the air inlet (3) to the inlet of the piston pump (13). The piston pump check valve (11) is connected to the second air passage (b) and is located between the outlet of the piston pump (13) and the inlet of the drying tank (8) to control the unidirectional flow of air from the outlet of the piston pump (13) to the inlet of the drying tank (8); The one-way valve (29) of the gas storage tank is connected to the sixth air passage (f) to control the unidirectional flow of air from the outlet of the drying tank (8) to the gas storage tank (27).

5. The air circuit system for air suspension as described in claim 4, characterized in that, It also includes an overflow valve (37) installed on the valve block (2), the piston pump (13) and the piston pump check valve (11) are combined to form a piston pump module, the overflow valve (37) and the piston pump module are connected in parallel through an air passage branch (3701), and the air passage branch (3701) is located inside the valve block (2).

6. The air circuit system for air suspension as described in claim 4, characterized in that, It also includes an air filter (15) installed on the valve block (2), the air filter (15) being connected to the first air passage (a) and located between the air inlet (3) and the air inlet check valve (16).

7. The air circuit system for air suspension as claimed in claim 1, characterized in that, It also includes a one-way throttle valve (33) installed on the valve block (2), which is connected to the third air passage (c) to control the amount of air flowing unidirectionally from the outlet of the dryer (8) to the rear end.

8. The air circuit system for air suspension as claimed in claim 1, characterized in that, It also includes a muffler (31) installed on the valve block (2), the muffler (31) being located at the exhaust port (4).

9. An air circuit system for air suspension, characterized in that, The system includes a valve block (2), which is provided with an air inlet (3) and an exhaust outlet (4). The valve block (2) is equipped with a spring assembly, an air tank (27), a dryer (8), and a piston pump (13). The valve block (2) is provided with a spring quick-connect fitting (5) and an air tank quick-connect fitting (7). The spring assembly is connected to the valve block (2) through the spring quick-connect fitting (5), and the air tank (27) is connected to the valve block (2) through the air tank quick-connect fitting (7). The air inlet (3) is connected to the inlet of the piston pump (13) through the first air passage (a), the outlet of the piston pump (13) is connected to the inlet of the dryer (8) through the second air passage (b), the outlet of the dryer (8) is provided with a third air passage (c), and also includes a fourth air passage (d) connected to the quick-connect fitting (7) of the air storage tank. The fourth air passage (d) is connected to the first air passage (a) through the eleventh air passage (k), the fourth air passage (d) is connected to the third air passage (c) through the twelfth air passage (m), and also includes a seventh air passage (g) connected to the quick-connect fitting (5) of the air spring. The seventh air passage (g) is connected to the first air passage (a) through the eighth air passage (h), the seventh air passage (g) is connected to the third air passage (c) through the twelfth air passage (m), and the third air passage (c) is connected to the exhaust port (4) through the tenth air passage (j). The first airway (a), the second airway (b), the third airway (c), the fourth airway (d), the seventh airway (g), the eighth airway (h), the tenth airway (j), the eleventh airway (k), and the twelfth airway (m) are all located within the valve block (2); a solenoid valve I (17) is installed on the valve block (2) to control the switching of the eighth airway (h), the eleventh airway (k), the twelfth airway (m), the seventh airway (g), and the fourth airway (d); a solenoid valve VI (28) is installed on the valve block (2) to control the switching of the fourth airway (d); a solenoid valve VII (30) is installed on the valve block (2) to control the switching of the tenth airway (j).

10. The air circuit system for air suspension as described in claim 9, characterized in that, The solenoid valve I (17) is a three-position five-way solenoid valve, and the solenoid valve VI (28) is a two-position two-way solenoid valve.

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