Air suspension system

Abstract

The invention discloses an air suspension system which comprises a closed-loop control loop, an air suspension, a filtering system and an air storage tank, the air suspension, the filtering system and the air storage tank are connected with the closed-loop control loop, the filtering system comprises a filter and a dryer, air enters the closed-loop control loop after being filtered by the filter and the dryer, and the air in the closed-loop control loop is kept dry; gas in the air suspension and the air storage tank can clean the filtering system through the closed-loop control loop, the gas firstly passes through the filter and the dryer, it is guaranteed that the gas in the closed-loop control loop is dry, moisture or foreign matter is prevented from entering the closed-loop control loop, and adverse effects caused by icing or blocking in the closed-loop control loop are avoided; and in the process of exhausting air into the atmosphere from the interior of the closed-loop control loop, reverse blowing can be carried out through the throttling valve connected with the dryer, water in the dryer or foreign matter in the filter is discharged, the safety of the closed-loop control loop is guaranteed, the replacement frequency of the filter and the dryer is reduced, and then the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air suspensions, and in particular to an air suspension system. Background Art

[0002] The air suspension system is a car suspension system that uses air pressure to adjust the height and stiffness of the car's suspension. It consists of an air pressure control module, an air tank, an air pressure sensor, a solenoid valve, and a suspension shock absorber. This suspension system is based on air spring technology, replacing traditional springs and shock absorbers with air spring devices. By controlling the air pressure, the height and stiffness of the car's suspension can be adjusted, thereby improving the vehicle's stability, comfort, and passability.

[0003] Specifically, when the vehicle passes through a bumpy road, the air pressure control module of the air suspension system will detect the vehicle's movement state and control the air pressure to be transmitted to each air spring through the solenoid valve, so that the vehicle body height is adjusted to a suitable position and a better shock absorption effect is obtained.

[0004] The air suspension systems currently used in vehicles are open and closed. The closed air suspension system has the advantages of low cost and reduced structural components. The closed air suspension system can actively dry the inhaled air to prevent humid air or foreign matter from entering the air suspension system and causing adverse effects on the system. If a separate filter is used to filter gas or foreign matter, the filter needs to be replaced frequently, which is costly. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an air suspension system, including a closed-loop control circuit and an air suspension, a filtering system and an air storage tank respectively connected to the closed-loop control circuit, the filtering system including a filter and a dryer, the gas first passes through the filter and the dryer for filtering and then enters the closed-loop control circuit, so as to keep the gas inside the closed-loop control circuit dry, and the gas in the air suspension and the air storage tank can clean the filtering system through the closed-loop control circuit.

[0006] Preferably, the air suspension comprises two first air springs and two second air springs, and the two first air springs and the two second air springs are respectively located on two single axles of the front and rear wheels of the vehicle.

[0007] Preferably, the air inlet of the filter is connected to the air inlet and outlet pipes, the air outlet of the filter is connected to the air inlet of the dryer through the air pipe, and the air outlet of the dryer is connected to the first main air pipe and the second main air pipe.

[0008] Preferably, the closed-loop control circuit includes an exhaust valve, a power limiting valve, a motor, an air compressor group, a switching valve group, a one-way valve group, a pressure sensor and an air valve group.

[0009] Preferably: the exhaust valve outlet is connected to the second main air pipe, the exhaust valve inlet is connected to the exhaust pipe, the exhaust pipe is connected to the first switching valve, and the other end of the exhaust pipe is connected to the main pipeline of the gas storage tank through a sixth connection point.

[0010] Preferably, the power limiting valve is connected to the first main air pipe and the pressure relief pipeline, and the air inlet of the power limiting valve is connected to the exhaust pipe.

[0011] Preferably, the air pump group includes a first air pump and a second air pump.

[0012] Preferably, the air valve group includes two first air valves and two second air valves, one of the first air valves is connected to one of the first air springs, and one of the second air valves is connected to one of the first air springs.

[0013] Preferably: the one-way valve group includes a second one-way valve and a third one-way valve, two second one-way valves are provided, and the two one-way valves are respectively located at the inlet and outlet of the first air pump, and two third one-way valves are provided, and the two third one-way valves are respectively located at the inlet and outlet of the second air pump.

[0014] Preferably, the switching valve group includes a first switching valve, a second switching valve, a third switching valve and a fourth switching valve, and the switching valve group is used to cooperate with a closed-loop control circuit to realize different working modes.

[0015] Technical effects and advantages of the present invention:

[0016] 1. In the present invention, the gas first passes through the filter and the dryer to ensure that the gas inside the closed-loop control loop is dry, and to prevent moisture or foreign matter from entering, which may cause adverse effects such as icing or blockage inside the closed-loop control loop. In addition, during the exhaust process from the closed-loop control loop to the atmosphere, a throttle valve connected to the dryer may be used for "backblowing" to discharge moisture in the dryer or foreign matter in the filter, thereby ensuring the safety of the closed-loop control loop, reducing the frequency of replacing the filter and the dryer, and thus reducing costs.

[0017] 2. In the present invention, when high pressure is generated in the air suspension and the gas tank or components in the closed-loop control circuit fail, the high-pressure gas in the air suspension and the gas tank can be discharged into the atmosphere to avoid excessive pressure in the closed-loop control circuit, thereby playing a protective role.

[0018] 3. In the present invention, a manual exhaust device is provided on the gas storage tank to ensure that after the closed-loop control circuit fails, the pressure in the gas storage tank can be exhausted through the manual exhaust device.

[0019] 4. In the present invention, when gas leakage occurs, the gas in the atmosphere can be replenished into the gas storage tank for storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of an air suspension system provided in an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of a first working mode of an air suspension system provided in an embodiment of the present application;

[0022] Figure 3 is a schematic diagram of a second working mode of the air suspension system provided in an embodiment of the present application;

[0023] Figure 4 is a schematic diagram of a third working mode of the air suspension system provided in an embodiment of the present application;

[0024] Figure 5 is a schematic diagram of a fourth working mode of the air suspension system provided in an embodiment of the present application;

[0025] Figure 6 is a schematic diagram of a fifth working mode of the air suspension system provided in an embodiment of the present application;

[0026] Figure 7 is a schematic diagram of a sixth working mode of the air suspension system provided in an embodiment of the present application;

[0027] Figure 8 is a schematic diagram of the seventh working mode of the air suspension system provided in an embodiment of the present application;

[0028] Fig. 9 is a schematic diagram of an eighth working mode of the air suspension system provided in an embodiment of the present application;

[0029] Fig.10 is a schematic diagram of a ninth working mode of the air suspension system provided in an embodiment of the present application;

[0030] Fig.11 It is a schematic diagram of the tenth working mode of the air suspension system provided in an embodiment of the present application.

[0031] In the figure: 1, air suspension; 1a, first air spring; 1b, second air spring; 2, closed-loop control circuit; 3, filtering system; 31, filter; 32, dryer; 4, air tank; 41, manual exhaust device; 5, inlet and outlet pipes; 6, first main air pipe; 6a, first connection point; 6b, second connection point; 6c, third connection point; 7, second main air pipe; 8, throttle valve; 9, exhaust valve; 10, exhaust pipe; 10a, fourth connection point; 10b, fifth connection point; 11, first switching valve; 12, air tank main line; 12a, sixth connection point; 12b, seventh connection point; 13, first non-return valve; 14, power limiting valve; 15, pressure relief line; 15a, eighth connection point Connection point; 16, first main air pipe branch; 17, motor; 18, air compressor group; 18a, first air compressor; 18b, second air compressor; 19, air compressor main line; 19a, first air compressor branch line; 19b, second air compressor branch line; 20, one-way valve group; 20a, second one-way valve; 20b, third one-way valve; 21, second switching valve; 22, pressure sensor main line; 22a, ninth connection point; 22b, tenth connection point; 23, pressure sensor; 24, pressure detection branch; 25, third switching valve; 26, fourth switching valve; 27, main air line; 27a, branch line; 28, air valve group; 28a, first air valve; 28b, second air valve. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0033] See also Figure 1As shown, in this embodiment, an air suspension system is provided, including a closed-loop control circuit 2 and an air suspension 1, a filter system 3 and an air storage tank 4 respectively connected to the closed-loop control circuit 2. The air suspension 1 includes two first air springs 1a and two first air springs 1b. The filter system 3 includes a filter 31 and a dryer 32. The gas first passes through the filter 31 and the dryer 32 for filtration before entering the closed-loop control circuit 2, so as to keep the gas inside the closed-loop control circuit 2 dry and prevent moisture or foreign matter from entering, which may cause adverse effects caused by icing or blockage inside the closed-loop control circuit 2. In addition, during the exhaust process from the inside of the closed-loop control circuit 2 to the atmosphere, "back-blowing" can be performed through a throttle valve 8 connected to the dryer 32. The gas in the air suspension 1 and the air storage tank 4 can clean the filter system 3 through the closed-loop control circuit 2, discharge moisture in the dryer 32 or foreign matter in the filter 31, ensure the safety of the closed-loop control circuit 2, clean the filter 31 and the dryer 32, reduce the replacement frequency of the filter 31 and the dryer 32, and thus reduce the cost.

[0034] In this embodiment, the air inlet of the filter 31 is connected to the air inlet and outlet pipes 5, the air outlet of the filter 31 is connected to the air inlet of the dryer 32 through the air pipe, and the air outlet of the dryer 32 is connected to the first main air pipe 6 and the second main air pipe 7, wherein the second main air pipe 7 is connected to a throttle valve 8, and the throttle valve 8 is a non-adjustable throttle valve 8, so that when exhausting from the second main air pipe 7 to the atmosphere, the airflow in the filtration system 3 is kept stable, thereby avoiding the impact of excessive air pressure on the filter 31 and the dryer 32.

[0035] In this embodiment, the closed-loop control circuit 2 includes an exhaust valve 9, a power limiting valve 14, a motor 17, an air compressor group 18, a switching valve group, a one-way valve group 20, a pressure sensor 23 and an air valve group, wherein the switching valve group includes a first switching valve 11, a second switching valve 21, a third switching valve 25 and a fourth switching valve 26, and the air valve group includes two first air valves 28a and two second air valves 28b, one first air valve 28a is connected to a first air spring 1a, and one second air valve 28b is connected to a first air spring 1b, thereby dividing the air valve group and the air spring into two groups, which are respectively located on the two single shafts of the front and rear wheels of the vehicle, to achieve independent shock absorption of the front and rear wheels.

[0036] In this embodiment, the air outlet of the exhaust valve 9 is connected to the second main air pipe 7, the air inlet of the exhaust valve 9 is connected to the exhaust pipe 10, the exhaust pipe 10 is connected to the first switching valve 11, the other end of the exhaust pipe 10 is connected to the air storage tank main line 12 through the sixth connection point 12a, one end of the air storage tank main line 12 is connected to the air outlet of the air storage tank 4, and the air storage tank 4 is provided with a manual exhaust device 41 to ensure that after the closed-loop control circuit 2 fails, the pressure in the air storage tank 4 can be exhausted through the manual exhaust device 41.

[0037] In this embodiment, the motor 17 is connected to the air compressor group 18, the air compressor group 18 is connected to the first main air pipe branch 16, the first main air pipe branch 16 is connected to the first main air pipe 6 through the second connection point 6b, the air compressor group 18 is also connected to the air compressor main line 19, one end of the air compressor main line 19 is connected to the exhaust pipe 10 through the fourth connection point 10a, and the other end of the air compressor main line 19 is connected to the first main air pipe 6 through the third connection point 6c. The third connection point 6c is also connected to one end of the pressure sensor main line 22, and the other end of the pressure sensor main line 22 is connected to the pressure sensor 23. The pressure sensor main line 22 is connected to the second switching valve 21, and the pressure sensor main line 22 is connected to the gas storage tank main line 12 through the seventh connection point 12b. The seventh connection point 12b is located between the second switching valve 21 and the third connection point 6c. The gas storage tank main line 12 is connected to the fourth switching valve 26, and the fourth switching valve 26 is located between the seventh connection point 12b and the sixth connection point 12a.

[0038] In this embodiment, the first main air pipe 6 is connected to the eighth connection point 15a through the first connection point 6a and the air pipe. The eighth connection point 15a is set on the pressure relief pipe 15. One end of the pressure relief pipe 15 is connected to the atmosphere, and the other end of the pressure relief pipe 15 is connected to the power limiting valve 14. The power limiting valve 14 is connected to the first main air pipe 6. The first main air pipe 6 connected to the air inlet of the power limiting valve 14 is connected to the exhaust pipe 10 through the fifth connection point 10b.

[0039] In this embodiment, the air pump group 18 includes a first air pump 18a and a second air pump 18b. The two air pumps can improve the gas delivery power and the speed of the vehicle body rising / falling. At the same time, the power and power consumption of the motor 17 can be reduced to achieve energy saving and environmental protection. When one air pump fails to work normally, the other air pump can still work normally, thereby reducing the working hidden dangers of the closed control loop 2. The air pump main line 19 is connected to the first air pump branch line 19a and the second air pump branch line 19b. The one-way valve group 20 includes a second one-way valve 20a and a third one-way valve 20b. Valve 20b, the first air compressor 18a is connected to the first air compressor branch pipeline 19a, and the first air compressor branch pipeline 19a is located at the inlet and outlet of the first air compressor 18a and is installed with a second one-way valve 20b, the second air compressor 18b is connected to the second air compressor branch pipeline 19b, and the second air compressor branch pipeline 19b is located at the inlet and outlet of the second air compressor 18b and is installed with a third one-way valve 20b, through the second one-way valve 20a and the third one-way valve 20b, the gas can only enter the air compressor main pipeline 19 and the air pump group 18 from the third connection point 6c, and then be discharged from the fourth connection point 10a.

[0040] In this embodiment, a first one-way valve 13 is further provided on the first main air pipe 6 , and the first one-way valve 13 is located between the first connection point 6 a and the second connection point 6 b .

[0041] In the embodiment, the pressure sensor main line 22 is connected to one end of the pressure detection branch 24 through the tenth connection point 22b, the pressure detection branch 24 is connected to the third switching valve 25, the other end of the pressure detection branch 24 is connected to the exhaust pipe 10 through the fifth connection point 10b, the pressure sensor main line 22 is connected to the main air line 27 through the ninth connection point 22a, the main air line 27 is connected to four bronchial lines 27a, the four bronchial lines 27a are respectively connected to two first air valves 28a and two second air valves 28b, and the other end of the bronchial line 27a is connected to the first air spring 1a and the first air spring 1b.

[0042] In the first working mode, refer to Figure 2 As shown, the third switching valve 25 and the fourth switching valve 26 are opened, the first switching valve 11 and the second switching valve 21 are closed, and the air tank 4 is connected with the air compressor group 18, the exhaust pipe 10, the pressure detection branch 24, the main air line 27, the branch line 27a, the air valve group 28 and the first air spring 1a through the air tank main line 12. The gas in the air tank 4 enters the first air spring 1a through the air pump group, the air pressure in the first air spring 1a increases, and the first air spring 1a stretches, causing the vehicle body to rise.

[0043] In the second working mode, see Figure 3 As shown, the first switching valve 11 and the second switching valve 21 are opened, the third switching valve 25 and the fourth switching valve 26 are closed, and the air tank 4 is connected to the air compressor group 18, the main line 27, the air valve group 28 and the first air spring 1a through the air tank main line 12 and the exhaust pipe 10. The gas in the first air spring 1a is discharged into the air tank 4 through the air pump group 18, the air pressure in the first air spring 1a is reduced, and the first air spring 1a is shortened, so that the vehicle body is lowered.

[0044] In the third working mode, see Figure 4 As shown, in an emergency, when the first air spring 1a is subjected to a greater pressure, the second switching valve 21 is opened, the first switching valve 11, the third switching valve 25 and the fourth switching valve 26 are closed, and the exhaust valve 9 is opened, so that the gas in the first air spring 1a is discharged through the air valve group 18, the exhaust valve 9, the second main line 7, the dryer 32, the filter 31 and the inlet and outlet pipes 5, the air pressure in the first air spring 1a is reduced, the first air spring 1a is shortened, and the vehicle body is lowered.

[0045] In the fourth working mode, see Figure 5As shown, the first switching valve 11, the second switching valve 21, the third switching valve 25 and the fourth switching valve 26 are closed, and the first air spring 1a is connected to the pressure sensor 23 through the branch line 27a, the main air line 27 and the pressure sensor main line 22. The pressure in each first air spring 1a is detected by the pressure sensor 23 to determine whether the first air spring 1a has leakage or excessive pressure.

[0046] In the fifth working mode, see Figure 6 As shown, the first switching valve 11 and the third switching valve 25 are opened, the second switching valve 21 and the fourth switching valve 26 are closed, and the gas tank 4 is connected to the first switching valve 11, the pressure detection branch 24, the third switching valve 25 and the pressure sensor 23 through the gas tank main line 12. The pressure in the gas tank 4 is detected by the pressure sensor 23 to determine whether the gas tank 4 has leakage or excessive pressure.

[0047] In the sixth working mode, see Figure 7 As shown, the first switching valve 11, the third switching valve 25 and the exhaust valve 9 are opened, the second switching valve 21 and the fourth switching valve 26 are closed, the air storage tank 4 is connected to the pressure sensor 23 and the filtering system 3 respectively, the gas in the air storage tank 4 is discharged from the inlet and outlet pipes 5, the exhaust pressure of the air storage tank 4 is detected by the pressure sensor 23, and the air pressure during exhaust can be controlled by the exhaust valve 9, and the air storage tank 4 is exhausted to the atmosphere, and the air flow passes through the filter 31, the dryer 32 and the throttle valve 8, and the filter 31 and the dryer 32 are "back-blown" to discharge the moisture in the dryer 32 and the foreign matter in the filter 31, thereby ensuring the safety of the closed-loop control circuit 2 and reducing the replacement frequency of the filter 31 and the dryer 32, thereby reducing the cost.

[0048] In the seventh working mode, see Figure 8 As shown, the first switching valve 11, the third switching valve 25 and the air pump group 18 are opened, the second switching valve 21 and the fourth switching valve 26 are closed, and the atmosphere enters the closed-loop control circuit 2 from the inlet and outlet pipes 5 after being filtered by the filter system 3, and enters the air storage tank 4 through the air pump group 18. The pressure of the intake air is detected by the pressure sensor 23, and the power of the air pump group 18 can be adjusted to adjust the pressure of the intake air. The first one-way valve 13 is set to prevent the gas in the air storage tank 4 from overflowing from the inlet and outlet pipes 5.

[0049] In the eighth working mode, see Fig. 9As shown, the first switching valve 11, the second switching valve 21, the third switching valve 25 and the fourth switching valve 26 are closed, the two first air valves 28a are opened, and the two second air valves 28b are closed, so that the two first air springs 1a are in a connected state, thereby realizing pressure compensation of the two first air springs 1a on a single axis. Similarly, the two first air valves 28a are closed, and the two second air valves 28b are opened, so that the two first air springs 1b are in a connected state, thereby realizing pressure compensation of the two first air springs 1b on another single axis.

[0050] In the ninth working mode, see Fig.10 As shown, when high pressure is generated in the air suspension 1 and the air tank 4 or components in the closed-loop control circuit 2 fail, the two first air valves 28a are opened, the two second air valves 28b are closed, the first switching valve 11, the second switching valve 21, the third switching valve 25, the fourth switching valve 26, the air pump group 18, and the exhaust valve 9 are closed, and the gas in the first air spring 1a is discharged through the third switching valve 25, the pressure detection branch 24, the power limiting valve 14, the pressure relief pipeline 15 and the inlet and outlet pipes 5, and the gas in the air tank 4 is discharged through the fourth switching valve 26, the air pump group 18, the power limiting valve 14, the pressure relief pipeline 15 and the inlet and outlet pipes 5, so as to avoid excessive pressure in the closed-loop control circuit 2, thereby playing a protective role.

[0051] In the tenth working mode, see Fig.11 As shown, when gas leakage occurs, the two first air valves 28a, the third switching valve 25, and the air pump group 18 are opened, and the two second air valves 28b, the first switching valve 11, the second switching valve 21 and the fourth switching valve 26 are closed, and the gas in the atmosphere is filtered from the inlet and outlet pipes 5 through the filtration system 3, and enters the two first air springs 1a through the air compressor group 18, the pressure detection branch 24, the main air pipeline 27 and the first air valve 28a. Similarly, the two second air valves 28b, the third switching valve 25, and the air pump group 18 are opened, and the two first air valves 28a, the first switching valve 11, the second switching valve 21 and the fourth switching valve 26 are closed, and the gas in the atmosphere enters the two first air springs 1b.

[0052] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. An air suspension system, It is characterized in that It includes a closed-loop control circuit and an air suspension, a filtering system and an air storage tank respectively connected to the closed-loop control circuit. The filtering system includes a filter and a dryer. The gas first passes through the filter and the dryer for filtering before entering the closed-loop control circuit to keep the gas inside the closed-loop control circuit dry. The gas in the air suspension and the air storage tank can clean the filtering system through the closed-loop control circuit.

2. An air suspension system according to claim 1, It is characterized in that The air suspension comprises two first air springs and two second air springs, and the two first air springs and the two second air springs are respectively located on two single shafts of the front and rear wheels of the vehicle.

3. An air suspension system according to claim 1, It is characterized in that The air inlet of the filter is connected to the air inlet and outlet pipes, the air outlet of the filter is connected to the air inlet of the dryer through the air pipe, and the air outlet of the dryer is connected to the first main air pipe and the second main air pipe.

4. An air suspension system according to claim 1, It is characterized in that The closed-loop control circuit includes an exhaust valve, a power limiting valve, a motor, an air compressor group, a switching valve group, a one-way valve group, a pressure sensor and an air valve group.

5. An air suspension system according to claim 4, It is characterized in that The exhaust valve outlet is connected to the second main air pipe, the exhaust valve inlet is connected to the exhaust pipe, the exhaust pipe is connected to the first switching valve, and the other end of the exhaust pipe is connected to the air tank main line through the sixth connection point.

6. An air suspension system according to claim 5, It is characterized in that The power limiting valve is connected to the first main air pipe and the pressure relief pipeline, and the air inlet of the power limiting valve is connected to the exhaust pipe.

7. An air suspension system according to claim 4, It is characterized in that The air pump group includes a first air pump and a second air pump.

8. An air suspension system according to claim 4, It is characterized in that The air valve group includes two first air valves and two second air valves, one of the first air valves is connected to one of the first air springs, and one of the second air valves is connected to one of the first air springs.

9. An air suspension system according to claim 4, It is characterized in that The one-way valve group includes a second one-way valve and a third one-way valve. There are two second one-way valves, and the two one-way valves are respectively located at the inlet and outlet of the first air pump. There are two third one-way valves, and the two third one-way valves are respectively located at the inlet and outlet of the second air pump.

10. An air suspension system according to claim 4, It is characterized in that The switching valve group includes a first switching valve, a second switching valve, a third switching valve and a fourth switching valve, and the switching valve group is used to realize different working modes.

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