Testing equipment and testing system for air supply unit of air suspension

Abstract

The invention relates to the technical field of air supply unit testing of an air suspension, in particular to air supply unit testing equipment and a testing system of the air suspension, and the testing equipment comprises a high-low temperature damp-heat alternating testing box, four simulation air spring load devices, an industrial personal computer and a first testing air path; the simulated air spring load device is used for simulating the load of an automobile body on the air spring; the gas supply unit is used for testing in a test room of the high-low temperature damp-heat alternating test box, and the high-low temperature damp-heat alternating test box, the gas supply unit and the first test gas path are all controlled by the industrial personal computer; the first test gas circuit is used for testing the gas supply unit. According to the invention, the air supply unit to be tested of the air suspension is tested in a simulated extreme environment, and the weight is increased or decreased to simulate the load of the vehicle body on the air spring, so that the core capabilities of pressure-flow control, environmental adaptability, reliability and the like of the air supply unit are effectively and systematically verified. The verification of the air supply unit is directly related to the safety, comfort and durability of the automobile.

Description

Technical Field

[0001] The present invention relates to the technical field of air suspension air supply unit testing, and particularly to an air suspension air supply unit testing device and a testing system. Background Art

[0002] With the development of automotive industry technology, in order to enhance the comfort and smoothness during vehicle driving, air suspension systems have been widely applied. Among them, the air supply unit of the air suspension is the core part of the air suspension, which provides compressed gas for the vehicle's air springs to buffer the vibration of the wheels. According to the pressure of the air storage tank and high-precision sensors, the start and stop of the air supply unit and the inflation and exhaust modes are adjusted in real time through an ECU (Electronic Control Unit), so as to change the height of the air springs and achieve the purpose of stable vehicle body height.

[0003] However, in the prior art, there is no device that can test the relevant performance of the air supply unit of the air suspension under extreme environments and effectively simulate the load conditions of the vehicle body on the air springs. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, one of the purposes of the present invention is to provide an air suspension air supply unit testing device and a testing system, which aim to solve the technical problem that there is no device in the prior art that can test the relevant performance of the air supply unit of the air suspension under extreme environments and effectively simulate the load conditions of the vehicle body on the air springs.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] In a first aspect, this aspect provides a testing device for the air supply unit of an air suspension. The air supply unit to be tested has an air storage tank connector, an intake pipeline, an exhaust pipeline, and four air spring interfaces. The testing device includes a high and low temperature humidity alternating test chamber, four simulated air spring load devices, an industrial control computer, and a first test air circuit; the simulated air spring load device includes a fixed frame, a guiding structure, a bearing plate, and weights. Guiding structures are provided on both opposite sides of the fixed frame. The opposite sides of the bearing plate are respectively slidably connected to the two guiding structures, and the bearing plate can slide vertically along the guiding structure; an air spring of the air suspension is provided on the fixed frame, and each of the air springs passes through each bearing plate from bottom to top. The four air springs are respectively communicated with the four air spring interfaces; the weights are placed on the bearing plate and connected to the air spring to simulate the load of the vehicle body on the air spring; the air supply unit is tested in the test chamber of the high and low temperature humidity alternating test chamber. The first test air circuit is arranged in the test chamber of the high and low temperature humidity alternating test chamber. The high and low temperature humidity alternating test chamber, the air supply unit, and the first test air circuit are all controlled by the industrial control computer; the first test air circuit includes a first air storage tank and a constant pressure air supply air circuit. The first air storage tank is communicated with the air storage tank connector of the air supply unit, and the constant pressure air supply air circuit is used to provide compressed air with different and stable pressures for the first air storage tank.

[0007] Further, the first test air circuit further includes a flowmeter a and a solenoid valve a. The solenoid valve a and the flowmeter a are arranged on the pipeline connecting the first air storage tank and the air storage tank connector.

[0008] Further, the constant pressure air supply air circuit includes an air supply pipe a, a control valve a, an air dryer a, a constant pressure air storage tank a, a pressure regulating valve a, and a solenoid valve b. One end of the air supply pipe a is used to connect to a compressed air source, and the other end is communicated with the input end of the first air storage tank; the control valve a, the air dryer a, the constant pressure air storage tank a, the pressure regulating valve a, and the solenoid valve b are sequentially arranged on the air supply pipe a in the flowing direction of the compressed air in the air supply pipe a.

[0009] Further, a pressurizing device is arranged outside the high and low temperature humidity alternating test chamber. The compressed air output from the compressed air source enters the air supply pipe a after being pressurized twice by the pressurizing device.

[0010] Further, the constant pressure air supply air circuit further includes a pressure sensor a. The pressure sensor a is arranged on the first air storage tank to detect the pressure in the first air storage tank.

[0011] Further, the constant pressure air supply air circuit further includes a drain valve a connected to the bottom of the first air storage tank.

[0012] Further, the regulated air supply gas path further includes a first overpressure protection pipeline, a solenoid valve c, and a safety valve. The solenoid valve c and the safety valve are respectively arranged at the input end and the output end of the first overpressure protection pipeline. The input end of the first overpressure protection pipeline is communicated with the first gas storage tank, and the output end of the first overpressure protection pipeline is configured with a first silencer.

[0013] Further, the air supply unit test equipment of the air suspension of the present invention further includes an independently arranged second test gas path for testing the solenoid valves of the air supply unit.

[0014] In a second aspect, the present invention provides an air suspension air supply unit test system for testing the above-mentioned air supply unit. The test system includes a third test gas path and the above-mentioned high and low temperature and humidity alternating test chamber. The third test gas path includes the first gas storage tank, an industrial control computer, and a regulated air supply gas path as described in claim 3. The third test gas path and the high and low temperature and humidity alternating test chamber are both controlled by the industrial control computer, and the third test gas path is located inside the high and low temperature and humidity alternating test chamber; the third test gas path further includes a second gas storage tank, a connecting pipe a, a connecting pipe b, a connecting pipe e, a solenoid valve d, a solenoid valve e, a solenoid valve f, a solenoid valve g, a solenoid valve h, and a flowmeter b. The two ends of the connecting pipe a are respectively communicated with the input end of the second gas storage tank and the output end of the pressure regulating valve a. The solenoid valve d is arranged on the connecting pipe a. The two ends of the connecting pipe b are respectively connected with a branch pipe a and a branch pipe b. The output end of the first gas storage tank is communicated with the branch pipe a and is communicated with the gas storage tank joint of the air supply unit through the connecting pipe e. The branch pipe b is communicated with the output end of the second gas storage tank; the flowmeter b is arranged on the connecting pipe c connecting the branch pipe b and the second gas storage tank; the connecting pipe b is further connected with a branch pipe c, a branch pipe d, a branch pipe e, and a branch pipe f. The branch pipe c, the branch pipe d, the branch pipe e, and the branch pipe f are respectively communicated with the four air spring interfaces of the air supply unit; the solenoid valve e is arranged on the branch pipe b, the solenoid valve f is arranged on the branch pipe a. At the connection point of the branch pipe b and the connecting pipe c, a connecting pipe d is connected. The connecting pipe d is communicated with the connecting pipe e. The solenoid valve g is arranged on the connecting pipe d, the solenoid valve h is arranged on the connecting pipe e, and the solenoid valve h is located between the connection point of the connecting pipe d and the connecting pipe e and the connection point of the output end of the first gas storage tank and the branch pipe a.

[0015] Further, the third test gas path further includes a second overpressure protection pipeline, a pressure sensor b, and a solenoid valve j. The two ends of the second overpressure protection pipeline are respectively communicated with the second gas storage tank and the safety valve. A drain valve b is connected to the bottom of the second gas storage tank; the pressure sensor b is arranged on the second gas storage tank for detecting the pressure inside the second gas storage tank.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. When the air supply unit test equipment of the air suspension of the present invention is in use, since the air supply unit to be tested is installed in a high and low temperature and humidity alternating test chamber for testing, the high and low temperature and humidity alternating test chamber can simulate the testing of the air supply unit in extreme environments such as high temperature environment, low temperature environment, humid environment, high altitude with high temperature environment, high altitude low temperature and high humidity environment, high altitude humid environment, high altitude low pressure environment, etc.; since the four air springs of the air suspension are respectively fixed on the fixing frames of the four simulated air spring load devices, the load of the vehicle body on the air spring is simulated by adding or reducing weights, so as to effectively simulate the load of the vehicle body on the air spring; during the test, for example, in the working mode of simulating the vehicle body rising, stable compressed air is provided for the first air storage tank through the constant pressure air supply air path, and the compressed air in the first air storage tank enters the air supply unit and then enters the four air springs to simulate the rising of the vehicle body, so that the relevant performance of the air supply unit can be verified in the working mode of simulating the vehicle body rising; for example, in the working mode of simulating the vehicle body descending, the compressed air in the four air springs enters the air supply unit and then enters the first air storage tank to simulate the vehicle body descending, so that the relevant performance of the air supply unit can be verified in the working mode of simulating the vehicle body descending. It can be seen that the air supply unit test equipment of the air suspension of the present invention can test the relevant performance of the air supply unit according to the requirements of the working mode.

[0018] In summary, the air supply unit test equipment of the air suspension of the present invention tests the relevant performance of the air supply unit of the air suspension by simulating in extreme environments and effectively simulating the load condition of the vehicle body on the air spring, and can systematically verify the core capabilities such as pressure control, environmental adaptability and reliability of the air supply unit, so as to effectively improve the driving safety, comfort and durability of the vehicle.

[0019] 2. When the air supply unit test system of the air suspension of the present invention is in use, the air spring is replaced by the second air storage tank. Since the air supply unit to be tested is installed in the high and low temperature and humidity alternating test chamber for testing, the high and low temperature and humidity alternating test chamber can simulate the air supply unit in extreme environments such as high temperature environment, low temperature environment, humid environment, high altitude with high temperature environment, high altitude low temperature and high humidity environment, high altitude humid environment, high altitude low pressure environment, etc. for testing; during the test, for example, in the working mode of simulating the body rising, stable compressed air is provided for the first air storage tank through the regulated air supply gas path. The compressed air in the first air storage tank enters the air supply unit and then enters the second air storage tank, simulating the rising of the body, so that the relevant performance of the air supply unit can be verified in the working mode of simulating the body rising; for example, in the working mode of simulating the body descending, the compressed air in the second air storage tank enters the air supply unit and then enters the first air storage tank, simulating the descending of the body, so that the relevant performance of the air supply unit can be verified in the working mode of simulating the body descending. It can be seen from this that the air supply unit test system of the air suspension of the present invention can test the relevant performance of the air supply unit according to the requirements of the working mode, so as to systematically verify the core capabilities such as pressure control, environmental adaptability and reliability of the air supply unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the air supply unit test equipment of the present invention;

[0021] Figure 2 is a schematic structural diagram of the simulated air spring load device according to an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the air flow direction of the first inflation mode for testing the air supply unit by the test equipment according to an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of the air flow direction of the second inflation mode for testing the air supply unit by the test equipment according to an embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of the air flow direction of the third inflation mode for testing the air supply unit by the test equipment according to an embodiment of the present invention;

[0025] Figure 6 is a schematic diagram of the air flow direction of the first exhaust mode for testing the air supply unit by the test equipment according to an embodiment of the present invention;

[0026] Figure 7 is a schematic diagram of the air flow direction of the second exhaust mode for testing the air supply unit by the test equipment according to an embodiment of the present invention;

[0027] Figure 8This is a schematic diagram of the air flow direction of the third exhaust mode of the test gas supply unit of the test device according to an embodiment of the present invention;

[0028] Figure 9 This is a schematic structural diagram of a test system according to an embodiment of the present invention;

[0029] Figure 10 This is a schematic diagram of the air flow direction of the first inflation mode of the test gas supply unit of the test system according to an embodiment of the present invention;

[0030] Figure 11 This is a schematic diagram of the air flow direction of the second inflation mode of the test gas supply unit of the test system according to an embodiment of the present invention;

[0031] Figure 12 This is a schematic diagram of the air flow direction of the third inflation mode of the test gas supply unit of the test system according to an embodiment of the present invention;

[0032] Figure 13 This is a schematic diagram of the air flow direction of the fourth inflation mode of the test gas supply unit of the test system according to an embodiment of the present invention;

[0033] Figure 14 This is a schematic diagram of the air flow direction of the first exhaust mode of the test gas supply unit of the test system according to an embodiment of the present invention;

[0034] Figure 15 This is a schematic diagram of the air flow direction of the second exhaust mode of the test gas supply unit of the test system according to an embodiment of the present invention;

[0035] Figure 16 This is a schematic diagram of the air flow direction of the third exhaust mode of the test gas supply unit of the test system according to an embodiment of the present invention;

[0036] Figure 17 This is a schematic diagram of the air flow direction of the fourth exhaust mode of the test gas supply unit of the test system according to an embodiment of the present invention;

[0037] Figure 18 This is a schematic diagram of the air flow direction of the solenoid valve of the test gas supply unit tested separately according to an embodiment of the present invention.

[0038] Reference numerals:

[0039] 1. High and low temperature humidity alternating test chamber; 2. Industrial control computer; 3. Simulated air spring load device; 30. Air spring; 31. Weight; 32. Guide optical rod; 33. Bearing plate; 4. Air supply unit; 40. Gas storage tank joint; 41. Inlet pipeline; 42. Exhaust pipeline; 43. Air spring interface; 430. Electric ball valve; 5. First test gas circuit; 50. First gas storage tank; 51. Flowmeter a; 52. Solenoid valve a; 53. Gas supply pipe a; 530. Control valve a; 531. Air dryer a; 532. Pressure stabilizing gas storage tank a; 533. Pressure regulating valve a; 534. Solenoid valve b; 535. Solenoid valve c; 536. Safety valve; 537. Pressure sensor a; 538. First overpressure protection pipeline; 539. Drain valve a; 6. Second test gas circuit; 60. Gas supply pipe b; 61. Control valve b; 62. Air dryer b; 63. Pressure stabilizing gas storage tank b; 64. Pressure regulating valve b; 65. Pressure sensor c; 66. Solenoid valve i; 67. Solenoid valve k; 68. Flowmeter c; 69. Solenoid valve m; 690. Second silencer; 691. Branch pipe j; 692. Branch pipe K; 7. Third test gas circuit; 70. Second gas storage tank; 71. Connecting pipe a; 72. Connecting pipe b; 720. Branch pipe c; 721. Branch pipe d; 722. Branch pipe e; 723. Branch pipe f; 724. Branch pipe a; 725. Branch pipe b; 73. Connecting pipe e; 74. Solenoid valve d; 75. Solenoid valve e; 76. Solenoid valve f; 77. Solenoid valve g; 78. Solenoid valve h; 79. Flowmeter b; 790. Connection point a; 791. Connection point b; 792. Connection point c; 793. Second overpressure protection pipeline; 794. Pressure sensor b; 795. Solenoid valve j; 796. Drain valve b; 797. Connecting pipe d; 8. Booster device. Detailed implementation manners

[0040] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "width", "upper", "lower", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0043] Please refer to Figure 1 - Figure 8 - In a first aspect, the present invention provides a testing device for the air supply unit 4 of an air suspension. The air supply unit 4 is the product to be tested. The structure of the air supply unit 4 in this embodiment is the structure of the air supply device disclosed in Patent Publication No. CN117885486A excluding the air storage tank and four air springs. That is, the air supply unit 4 has an air storage tank joint 40, an intake pipeline 41, an exhaust pipeline 42, and four air spring interfaces 43. Among them, the air supply device described in the air supply device disclosed in CN117885486A belongs to the air compressor part of the air supply unit 4 in this embodiment.

[0044] The testing device of this embodiment includes a high and low temperature and humidity alternating test chamber 1, four simulated air spring load devices 3, an industrial control computer 2, and a first test air circuit 5. The simulated air spring load device 3 includes a fixing frame, a guiding structure, a bearing plate 33, and weights 31. Guiding structures are provided on opposite sides of the fixing frame. The guiding structures are guiding optical rods 32. Opposite sides of the bearing plate 33 are respectively slidably connected to the two guiding structures, so that the bearing plate 33 can slide vertically along the guiding structures. An air spring 30 of the air suspension is fixed on the fixing frame, and each air spring 30 passes through each bearing plate 33 from bottom to top, and each bearing plate 33 is supported by each air spring 30.

[0045] It should be noted that the high and low temperature and humidity alternating test chamber 1 has an existing structure, and its specific structure and the implementation methods of providing extreme environments such as high temperature or low temperature or humid heat or high altitude high temperature environment or high altitude low temperature and high humidity environment or high altitude humid heat environment or high altitude low pressure environment will not be described here.

[0046] The four air springs 30 are respectively communicated with the four air spring interfaces 43 of the air supply unit 4; the weights 31 are placed on the bearing plate 33 and connected to the air springs 30 to simulate the load of the vehicle body on the air springs 30. Of course, an electric ball valve 430 controlled by the industrial control computer 2 is provided between the air spring 30 and the air spring interface 43.

[0047] The air supply unit 4 is tested in the test chamber of the high and low temperature and humidity alternating test chamber 1; the first test air circuit 5 is arranged in the test chamber of the high and low temperature and humidity alternating test chamber 1. Of course, the high and low temperature and humidity alternating test chamber 1, the air supply unit 4 and the first test air circuit 5 are all controlled by the industrial control computer 2; the first test air circuit 5 includes a first gas storage tank 50, a flow meter a51, a solenoid valve a52 and a constant pressure air supply circuit. The solenoid valve a52 and the flow meter a51 are arranged on the pipeline connecting the first gas storage tank 50 and the gas storage tank joint 40, and the first gas storage tank 50 is communicated with the gas storage tank joint 40 of the air supply unit 4. Among them, the flow meter a51 is used to detect the flow rate of the compressed air entering the air supply unit 4, and the constant pressure air supply circuit is used to provide compressed air with different and stable pressures for the first gas storage tank 50.

[0048] When the test equipment for the air supply unit 4 of the air suspension of the present invention is in use, since the air supply unit 4 to be tested is installed in the high and low temperature and humidity alternating test chamber 1 for testing, the high and low temperature and humidity alternating test chamber 1 can simulate the testing of the air supply unit 4 in extreme environments such as high temperature or low temperature or humid heat or high altitude high temperature environment or high altitude low temperature and high humidity environment or high altitude humid heat environment or high altitude low air pressure environment. Since the four air springs 30 of the air suspension are respectively fixed on the fixing frames of the four simulated air spring load devices 3, the load of the vehicle body on the air spring 30 is simulated by adding or reducing weights 31, so as to effectively simulate the load of the vehicle body on the air spring 30. During the test, for example, in the working mode of simulating the vehicle body rising, stable compressed air is provided for the first air storage tank 50 through the regulated air supply air path. The compressed air in the first air storage tank 50 enters the air supply unit 4 and then enters the four air springs 30 to simulate the rising of the vehicle body, so that the relevant performance of the air supply unit 4 can be verified in the working mode of simulating the vehicle body rising; for example, in the working mode of simulating the vehicle body descending, the compressed air in the four air springs 30 enters the air supply unit 4 and then enters the first air storage tank 50 to simulate the vehicle body descending, so that the relevant performance of the air supply unit 4 can be verified in the working mode of simulating the vehicle body descending. It can be seen that the test equipment for the air supply unit 4 of the air suspension of the present invention can perform relevant performance tests on the air supply unit 4 according to the requirements of the working mode.

[0049] In summary, the test equipment for the air supply unit 4 of the air suspension of the present invention tests the relevant performance of the air supply unit 4 of the air suspension by simulating extreme environments and effectively simulating the load conditions of the vehicle body on the air spring 30, and can systematically verify the core capabilities such as pressure control, environmental adaptability and reliability of the air supply unit 4, thereby effectively improving the driving safety, comfort and durability of the vehicle.

[0050] In this embodiment, the regulated air supply circuit includes a supply pipe a53, a control valve a530, an air dryer a531, a regulated air storage tank a532, a pressure regulating valve a533, a solenoid valve b534, a solenoid valve c535, a safety valve 536, a pressure sensor a537, a first overpressure protection pipeline 538, and a drain valve a539. One end of the supply pipe a53 is used to connect to a compressed air source, and the other end of the supply pipe a53 is communicated with the input end of the first air storage tank 50. Among them, the control valve a530, the air dryer a531, the regulated air storage tank a532, the pressure regulating valve a533, and the solenoid valve b534 are sequentially arranged on the supply pipe a53 in the flowing direction of the compressed air in the supply pipe a53. Among them, the pressure regulating valve a533 is mainly used to regulate the pressure of the compressed air entering the first air storage tank 50; the regulated air storage tank a532 is mainly used to stabilize the pressure of the compressed air and avoid being affected by the pressure fluctuation of the compressed air during the process of testing the air supply unit 4; the solenoid valve b534 is mainly used to control the on-off of the compressed air entering the first air storage tank 50 from the regulated air storage tank a532. It can be seen that by combining the regulated air storage tank a532 and the pressure regulating valve a533, different pressures and stable compressed air can be provided for the first air storage tank 50.

[0051] In this embodiment, the drain valve a539 is connected to the bottom of the first air storage tank 50. During the process of the first air storage tank 50 storing compressed air, the water vapor in the air will condense into liquid water due to the changes in temperature and pressure. These liquid waters will accumulate at the bottom of the first air storage tank 50 because the density of water is greater than that of air. The drain valve a539 is installed at the bottom of the first air storage tank 50, taking advantage of this physical property to facilitate the effective drainage of the accumulated water.

[0052] In this embodiment, the pressure sensor a537 is arranged on the first air storage tank, and the pressure sensor a537 is used to detect the pressure inside the first air storage tank. In addition, the solenoid valve c535 and the safety valve 536 are respectively arranged at the input end and the output end of the first overpressure protection pipeline 538. The input end of the first overpressure protection pipeline 538 is communicated with the first air storage tank 50, and the output end of the first overpressure protection pipeline 538 is configured with a first muffler. When the pressure sensor a537 detects that the pressure in the regulated air storage tank a532 is higher than the set threshold, the solenoid valve c535 is opened, and pressure relief is carried out through the safety valve 536 to play a role in safety protection. In addition, the first muffler can eliminate the sound of the gas discharged from the safety valve 536 to play a role in noise reduction. It should be noted that the solenoid valve c535 will only automatically open when the pressure in the first air storage tank 50 is greater than the preset threshold, and it is mainly used in combination with the safety valve 536 to play a protective role.

[0053] In this embodiment, a pressurizing device 8 is provided outside the high and low temperature and humidity alternating test chamber 1. The pressurizing device 8 can be a booster pump. The compressed air output from the compressed air source enters the air supply pipe a53 after being pressurized twice by the pressurizing device 8. It can be seen from this that after the compressed air is output from the output end of the compressed air source, it enters the pressurizing device 8 for secondary pressurization and then enters the pressure stabilizing gas storage tank a532 for stable storage. The setting of the pressurizing device 8 is mainly used to meet the test requirements and avoid insufficient pressure of the compressed air output from the output end of the compressed air source.

[0054] For the test equipment of the air supply unit 4, the working modes of the air supply unit 4 are introduced in detail here:

[0055] The first inflation mode: Refer to Figure 3 , the intake pipeline 41 is closed, the pressure regulating valve a533, the control valve a530, the solenoid valve b534, and the solenoid valve a52 are opened. After the compressed air is output from the output end of the compressed air source and enters the air dryer for drying, it enters the pressure stabilizing gas storage tank a532 for pressure stabilization, and then is sequentially delivered to the first gas storage tank 50, the gas storage tank connector 40, the air supply unit 4, and finally enters one or more of the four air springs 30 to simulate the elevation of the vehicle body.

[0056] The second inflation mode: Refer to Figure 4 , the control valve a530 is closed, and the ambient air enters the air supply unit 4 through the intake pipeline 41 of the air supply unit 4 and finally enters one or more of the four air springs 30 to simulate the elevation of the vehicle body.

[0057] The third inflation mode: Refer to Figure 5 , the solenoid valve b534 is closed, the electric ball valve 430 is closed, the solenoid valve a52 is opened, and the ambient air enters the air supply unit 4 through the intake pipeline 41 of the air supply unit 4 and finally enters the first gas storage tank 50 for storage.

[0058] The first exhaust mode: Refer to Figure 6 , the compressed air enters the first gas storage tank 50 from the air spring 30 via the air supply unit 4 to simulate the lowering of the vehicle body.

[0059] The second exhaust mode: Refer to Figure 7 , the compressed air enters the outside environment from the air spring 30 via the air supply unit 4 and then is discharged from the exhaust pipeline 42 of the air supply unit 4 to simulate the lowering of the vehicle body.

[0060] The third exhaust mode: Refer to Figure 8 , the electric ball valve 430 is closed, the solenoid valve a52 is opened, the compressed air is delivered from the first gas storage tank 50 to the air supply unit 4 and then is discharged from the exhaust pipeline 42 of the air supply unit 4 to the outside environment.

[0061] Second, refer to Figure 1 ,Figure 9 - Figure 16 The present invention provides a test system for an air supply unit 4 of an air suspension, which is used to test the above-mentioned air supply unit 4. The test system includes a third test air circuit 7, the above-mentioned industrial control computer 2, and the above-mentioned high and low temperature and humidity alternating test chamber 1. Both the third test air circuit 7 and the above-mentioned air supply unit 4 are inside the high and low temperature and humidity alternating test chamber 1. The third test air circuit 7 includes the above-mentioned first air storage tank 50, the above-mentioned constant pressure air supply circuit, a second air storage tank 70, a connecting pipe a71, a connecting pipe b72, a connecting pipe e73, a solenoid valve d74, a solenoid valve e75, a solenoid valve f76, a solenoid valve g77, a solenoid valve h78, and a flowmeter b79. Of course, the third test air circuit 7, the high and low temperature and humidity alternating test chamber 1, and the constant pressure air supply circuit are all controlled by the industrial control computer 2.

[0062] Wherein, both ends of the connecting pipe a71 are respectively communicated with the input end of the second air storage tank 70 and the output end of the pressure regulating valve a533. The solenoid valve d74 is arranged on the connecting pipe a71. Both ends of the connecting pipe b72 are respectively connected with a branch pipe a724 and a branch pipe b725. The output end of the first air storage tank 50 is communicated with the branch pipe a724 and is communicated with the air storage tank joint 40 of the air supply unit 4 through the connecting pipe e73. The branch pipe b725 is communicated with the output end of the second air storage tank 70. The flowmeter b79 is arranged on the connecting pipe c connecting the branch pipe b725 and the second air storage tank 70. The flowmeter b79 is mainly used to detect the flow rate into the second air storage tank 70. In addition, the connecting pipe b72 is also connected with a branch pipe c720, a branch pipe d721, a branch pipe e722, and a branch pipe f723. The branch pipe c720, the branch pipe d721, the branch pipe e722, and the branch pipe f723 are respectively communicated with four air spring interfaces 43 of the air supply unit 4.

[0063] The solenoid valve e75 is arranged on the branch pipe b725. The solenoid valve f76 is arranged on the branch pipe a724. A connecting pipe d797 is connected at the connection point a790 of the branch pipe b725 and the connecting pipe c. The connecting pipe d797 is communicated with the connecting pipe e73. The solenoid valve g77 is arranged on the connecting pipe d797. The solenoid valve h78 is arranged on the connecting pipe e73, and the solenoid valve h78 is located between the connection point b791 where the connecting pipe d797 is connected to the connecting pipe e73 and the connection point c792 where the output end of the first air storage tank 50 is connected to the branch pipe a724.

[0064] In this embodiment, the third test air circuit 7 further includes a second overpressure protection pipeline 793, a pressure sensor b794, and a solenoid valve j795. The two ends of the second overpressure protection pipeline 793 are respectively communicated with the second air storage tank 70 and the safety valve 536. The solenoid valve j795 is arranged on the second overpressure protection pipeline 793, and a drain valve b796 is connected to the bottom of the second air storage tank 70. During the process of storing compressed air in the second air storage tank 70, water vapor in the air will condense into liquid water due to changes in temperature and pressure. These liquid waters will accumulate at the bottom of the first air storage tank 50 because the density of water is greater than that of air. The drain valve b796 is installed at the bottom of the second air storage tank 70, taking advantage of this physical property to effectively drain the accumulated water. It should be noted that the solenoid valve j795 will only automatically open when the pressure in the second air storage tank 70 is greater than the preset threshold, and it is mainly used in combination with the safety valve 536 to play a protective role.

[0065] The pressure sensor b794 is arranged on the second air storage tank 70 to detect the pressure in the second air storage tank 70. When the pressure sensor b794 detects that the pressure in the second air storage tank 70 is higher than the set threshold, the solenoid valve j795 is opened, and pressure relief is carried out through the safety valve 536 to play a safety protection role.

[0066] When the air supply unit 4 test system of the air suspension of the present invention is in use, the air spring 30 is replaced by the second air storage tank 70. Since the air supply unit 4 to be tested is installed in the high and low temperature and humidity alternating test chamber 1 for testing, the high and low temperature and humidity alternating test chamber 1 can simulate the air supply unit 4 in extreme environments such as high temperature or low temperature or humid heat or high altitude high temperature environment or high altitude low temperature high humidity environment or high altitude humid heat environment or high altitude low pressure environment for testing. During the test, for example, in the working mode of simulating the body rising, stable compressed air is provided for the first air storage tank 50 through the regulated air supply air circuit. The compressed air in the first air storage tank 50 enters the air supply unit 4 and then enters the second air storage tank 70 to simulate the rising of the body, so that the relevant performance of the air supply unit 4 can be verified in the working mode of simulating the body rising; for example, in the working mode of simulating the body descending, the compressed air in the second air storage tank 70 enters the air supply unit 4 and then enters the first air storage tank 50 to simulate the body descending, so that the relevant performance of the air supply unit 4 can be verified in the working mode of simulating the body descending. It can be seen that the air supply unit 4 test system of the air suspension of the present invention can test the relevant performance of the air supply unit 4 according to the requirements of the working mode, so as to systematically verify the core capabilities such as pressure control, environmental adaptability, and reliability of the air supply unit 4.

[0067] For the air supply unit 4 test system, the working mode of the air supply unit 4 is introduced in detail here:

[0068] The first inflation mode: Refer to Figure 10 , after compressed air is output from the output end of the compressed air source and enters the air dryer a531 for drying, it enters the pressure-stabilizing gas storage tank a532 for pressure stabilization, and then is successively transported to the first gas storage tank 50, the gas storage tank connector 40, the air supply unit 4, and finally enters the second gas storage tank 70 to simulate the body lifting. Specifically, the solenoid valves d74, f76, and g77 are closed. Compressed air is output from the output end of the compressed air source and enters the air dryer a531, then enters the pressure-stabilizing gas storage tank a532 for pressure stabilization, and then is successively transported to the solenoid valve b534, the first gas storage tank 50, the solenoid valve h78, the gas storage tank connector 40, the air supply unit 4, and then enters the solenoid valve e75 through the branch pipes c720, d721, e722, and f723, and finally enters the second gas storage tank 70 to simulate the body lifting.

[0069] The second inflation mode: Refer to Figure 11 , after ambient air enters the air supply unit 4 through the intake pipeline 41 of the air supply unit 4, it finally enters the second gas storage tank 70 through the branch pipe b725 to simulate the body lifting. Specifically, the solenoid valves g77, h78, f76, and d74 are closed. After ambient air enters the air supply unit 4 through the intake pipeline 41 of the air supply unit 4, it enters the solenoid valve e75 through the branch pipes c720, d721, e722, and f723, and finally enters the second gas storage tank 70 to simulate the body lifting.

[0070] The third inflation mode: Refer to Figure 12 , after ambient air enters the air supply unit 4 through the intake pipeline 41 of the air supply unit 4, it finally enters the second gas storage tank 70 through the connecting pipe d797 to simulate the body lifting. Specifically, the solenoid valves h78, e75, f76, and d74 are closed. After ambient air enters the air supply unit 4 through the intake pipeline 41 of the air supply unit 4, it enters the connecting pipe d797 through the connecting pipe e73 and finally enters the second gas storage tank 70 to simulate the body lifting.

[0071] The fourth inflation mode: Refer to Figure 13 , after ambient air enters the air supply unit 4 through the intake pipeline 41 of the air supply unit 4, it finally enters the first gas storage tank 50 through the connecting pipe e73. Specifically, the solenoid valves g77, f76, and e75 are closed. After ambient air enters the air supply unit 4 through the intake pipeline 41 of the air supply unit 4, it enters the solenoid valve h78 and the connection point c792 through the connecting pipe e73, and then enters the first gas storage tank 50.

[0072] The first exhaust mode: Refer to Figure 14, after the compressed air in the second air storage tank 70 passes through the air supply unit 4, it is discharged from the exhaust pipe 42 of the air supply unit 4 to the external environment to simulate the body descending. Specifically, the solenoid valves d74, f76, h78, and g77 are closed. The compressed air in the second air storage tank 70 enters the branch pipes c720, d721, e722, and f723 respectively through the solenoid valve e75, then enters the air supply unit 4, and finally is discharged from the exhaust pipe 42 of the air supply unit 4 to the external environment to simulate the body descending.

[0073] The second exhaust mode: Refer to Figure 15 , after the compressed air in the second air storage tank 70 passes through the air supply unit 4, it enters the first air storage tank 50 from the air storage tank connector 40 of the air supply unit 4 through the connecting pipe e73 to simulate the body descending. Specifically, the solenoid valves b534, d74, f76, and g77 are closed. After the compressed air in the second air storage tank 70 passes through the air supply unit 4, it enters the connecting pipe e73 from the air storage tank connector 40 of the air supply unit 4, and finally passes through the solenoid valve h78 and the connection point c792 in sequence and enters the first air storage tank 50 to simulate the body descending.

[0074] The third exhaust mode: Refer to Figure 16 , after the compressed air in the first air storage tank 50 passes through the air supply unit 4, it is discharged from the exhaust pipe 42 of the air supply unit 4 to the external environment. Specifically, the solenoid valves g77 and e75 are closed. The compressed air in the first air storage tank 50 enters the solenoid valve h78 through the connecting pipe e73, then enters the air supply unit 4 from the air storage can, and finally is discharged from the exhaust pipe 42 of the air supply unit 4 to the external environment.

[0075] The fourth exhaust mode: Refer to Figure 17 , after the compressed air in the first air storage tank 50 passes through the air supply unit 4, it is discharged from the exhaust pipe 42 of the air supply unit 4 to the external environment. Specifically, the solenoid valves e75 and h78 are closed. The compressed air in the first air storage tank 50 enters the air supply unit 4 through the solenoid valve f76, branch pipe a724, branch pipes c720, d721, e722, and f723, and then is discharged from the exhaust pipe 42 of the air supply unit 4 to the external environment.

[0076] In addition, on the basis of the above structure, refer to Figure 18, the testing equipment and / or testing system for the air supply unit 4 of the air suspension of the present invention further includes an independently provided second testing air circuit 6 for testing the solenoid valves of the air supply unit 4 in the high and low temperature and humidity alternating test chamber 1. The second testing air circuit 6 includes an air supply pipe b60, a control valve b61, an air dryer b62, a pressure stabilizing air storage tank b63, a pressure regulating valve b64, a pressure sensor c65, a solenoid valve i66, a solenoid valve k67, a flow meter c68, a solenoid valve m69 and a second silencer 690. One end of the air supply pipe b60 is communicated with the output end of the above-mentioned pressurizing device 8, and the other end is used to be connected with the input end of the solenoid valve to be tested. The output end of the solenoid valve to be tested can be used to be connected with the connecting pipe F. Both ends of the connecting pipe F are respectively communicated with one end of a branch pipe j691 and a branch pipe K692, and the other ends of the branch pipe j691 and the branch pipe K692 are connected with the second silencer 690.

[0077] Among them, the control valve b61, the air dryer b62, the pressure stabilizing air storage tank b63, the pressure regulating valve b64, the pressure sensor c65, and the solenoid valve i66 are sequentially arranged on the air supply pipe b60 in the direction of compressed air entering the air supply pipe b60. The solenoid valve k67 is arranged on the branch pipe j691, the flow meter c68 is arranged on the branch pipe j691, and the flow meter c68 is located between the solenoid valve k67 and the second silencer 690. The solenoid valve m69 is arranged on the branch pipe K692.

[0078] When testing the solenoid valve to be tested alone, the compressed air from the compressed air source enters the air dryer b62 for drying, and then sequentially passes through the pressure regulating valve b64, the solenoid valve i66, and the solenoid valve to be tested, and then sequentially enters the solenoid valve m69 and the flow meter c68 and finally is discharged to the external environment from the solenoid valve k67. The second silencer 690 can eliminate the sound of the gas discharged from the solenoid valve k67 and play a role in noise reduction. The pressure sensor c65 is mainly used to detect the pressure of the compressed air entering the solenoid valve to be tested, and the flow meter c68 is mainly used to detect the flow rate of the compressed air output from the solenoid valve to be tested.

[0079] In summary, the testing equipment and testing system for the air supply unit 4 of the air suspension of the present invention can not only test the relevant performances of the air supply unit 4 assembly, but also test the relevant performances of the air compressor of the air supply unit 4 alone, and can also independently test the relevant performances of the solenoid valves of the air supply unit 4.

[0080] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. An air supply unit test device for an air suspension, wherein the air supply unit to be tested has an air tank joint, an air intake pipeline, an exhaust pipeline and four air spring interfaces, characterized in that: The test equipment includes a high-low temperature and humidity alternating test chamber, four simulated air spring load devices, an industrial computer and a first test air circuit; the simulated air spring load device includes a fixed frame, a guide structure, a pressure plate and a weight, and the opposite sides of the fixed frame are provided with guide structures, and the opposite sides of the pressure plate are respectively slidably connected with the two guide structures, and the pressure plate can slide vertically along the guide structure; the fixed frame is provided with air springs of the air suspension, and each of the air springs is respectively passed through each pressure plate from bottom to top, and the four air springs are respectively connected with the four air spring interfaces ; The weight is placed on the pressure plate and connected to the air spring to simulate the load of the automobile body on the air spring; the air supply unit is tested in the test room of the high and low temperature and humidity alternating test box, and the first test air circuit is arranged in the test room of the high and low temperature and humidity alternating test box, and the high and low temperature and humidity alternating test box, the air supply unit and the first test air circuit are all controlled by an industrial computer; the first test air circuit includes a first air tank and a pressure-stabilizing air supply circuit, the first air tank is connected to the air tank connector of the air supply unit, and the pressure-stabilizing air supply circuit is used to provide the first air tank with stable compressed air of different pressures.

2. The air supply unit test equipment of an air suspension according to claim 1, characterized in that: The first test gas circuit also includes a flow meter a and a solenoid valve a, and the solenoid valve a and the flow meter a are arranged on a pipeline connecting the first gas storage tank and the gas storage tank joint.

3. The air supply unit test equipment of an air suspension according to claim 1, characterized in that: The pressure-stabilizing air supply circuit includes an air supply pipe a, a control valve a, an air dryer a, a pressure-stabilizing air tank a, a pressure regulating valve a and a solenoid valve b. One end of the air supply pipe a is used to connect to a compressed air source, and the other end is connected to an input end of the first air tank; the control valve a, air dryer a, pressure-stabilizing air tank a, pressure regulating valve a and solenoid valve b are arranged on the air supply pipe a in sequence according to the direction in which the compressed air flows in the air supply pipe a.

4. The air supply unit test equipment of an air suspension according to claim 3, characterized in that: A booster device is provided outside the high-low temperature and humidity alternating test chamber, and the compressed air output from the compressed air source enters the air supply pipe a after secondary boosting by the booster device.

5. The air supply unit test equipment of an air suspension according to claim 1, characterized in that: The pressure-stabilizing gas supply circuit also includes a pressure sensor a, which is arranged on the first gas storage tank and is used to detect the pressure in the first gas storage tank.

6. The air supply unit test equipment of an air suspension according to claim 1, characterized in that: The pressure-stabilizing gas supply circuit also includes a drain valve a connected to the bottom of the first gas storage tank.

7. The air supply unit test equipment of an air suspension according to claim 1, characterized in that: The pressure-stabilizing air supply circuit also includes a first overpressure protection pipeline, a solenoid valve c and a safety valve. The solenoid valve c and the safety valve are respectively arranged at the input end and the output end of the first overpressure protection pipeline. The input end of the first overpressure protection pipeline is connected to the first air storage tank, and the output end of the first overpressure protection pipeline is configured with a first muffler.

8. The air supply unit testing device of an air suspension according to claim 1, characterized in that: It also includes an independently arranged second test gas circuit for testing the solenoid valve of the gas supply unit.

9. An air supply unit test system for an air suspension, used for testing the air supply unit according to any one of claims 1 to 8, characterized in that: The test system includes a third test gas circuit and the high-low temperature and humidity alternating test box as described in claim 3, the third test gas circuit includes the first gas storage tank, the industrial computer and the pressure-stabilized gas supply gas circuit as described in claim 3, the third test gas circuit and the high-low temperature and humidity alternating test box are both controlled by the industrial computer, and the third test gas circuit is located in the high-low temperature and humidity alternating test box; the third test gas circuit also includes a second gas storage tank, a connecting pipe a, a connecting pipe b, a connecting pipe e, a solenoid valve d, a solenoid valve e, a solenoid valve f, a solenoid valve g, a solenoid valve h and a flowmeter b, the two ends of the connecting pipe a are respectively connected to the input end of the second gas storage tank and the output end of the pressure regulating valve a, the solenoid valve d is arranged on the connecting pipe a, the two ends of the connecting pipe b are respectively connected to the branch pipe a and the branch pipe b, the output end of the first gas storage tank is connected to the branch pipe a and It is connected to the gas tank joint of the gas supply unit through the connecting pipe e, and the branch pipe b is connected to the output end of the second gas tank; the flowmeter b is arranged on the connecting pipe c connecting the branch pipe b and the second gas tank; the connecting pipe b is also connected to the branch pipe c, the branch pipe d, the branch pipe e and the branch pipe f, and the branch pipe c, the branch pipe d, the branch pipe e and the branch pipe f are respectively connected to the four air spring interfaces of the gas supply unit; the solenoid valve e is arranged on the branch pipe b, the solenoid valve f is arranged on the branch pipe a, the connecting point of the branch pipe b and the connecting pipe c is connected with the connecting pipe d, the connecting pipe d is connected to the connecting pipe e, the solenoid valve g is arranged on the connecting pipe d, the solenoid valve h is arranged on the connecting pipe e, and the solenoid valve h is located between the connecting point of the connecting pipe d and the connecting pipe e and the connecting point of the output end of the first gas tank and the branch pipe a.

10. The air supply unit test system of an air suspension according to claim 9, characterized in that: The third test gas circuit also includes a second overpressure protection pipeline, a pressure sensor b and a solenoid valve j. The two ends of the second overpressure protection pipeline are respectively connected to the second gas storage tank and the safety valve. The bottom of the second gas storage tank is connected to a drain valve b. The pressure sensor b is arranged on the second gas storage tank for detecting the pressure in the second gas storage tank.

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