Test method and system for air suspension compressor

Abstract

The present invention discloses a testing method and system for an air suspension compressor, belonging to the technical field of vehicle component testing. The testing method for the air suspension compressor can obtain a current variation curve of the compressor and a first pressure variation curve of the air tank after controlling the compressor to charge an air tank with gas, and can obtain a second pressure variation curve of the air tank by controlling the compressor to discharge the gas in the air tank. The parameters such as the starting power supply, charging time, limiting air pressure, conventional output flow, exhaust time and residual pressure of the compressor can be tested, and the operating status of the compressor during the charging process and the exhaust process can be tested, so as to quickly and accurately measure various functional conditions of the compressor of the air suspension to meet the needs of rapid development of the air suspension.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle component testing, and in particular to a testing method and system for an air suspension compressor. Background Art

[0002] Air suspension technology is one of the cutting-edge technologies in the automotive industry. Air suspension systems are used in various types of vehicles, and compressors are the main components of air suspension systems. In order to meet the needs of rapid development, it is necessary to conduct relevant tests on air suspension compressors to detect the various functions of the compressors and then detect whether the performance of the compressors during use meets the requirements. However, in the prior art, there is a lack of methods or devices specifically used to test the various functions of air suspension compressors. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a test method for an air suspension compressor, which can quickly and accurately measure various functions of the air suspension compressor to meet the needs of rapid development of air suspension.

[0004] The present invention also provides a test system including a device for executing the test method for an air suspension compressor.

[0005] A test method for an air suspension compressor according to a first aspect of an embodiment of the present invention is applied to a test system for an air suspension compressor, the test system comprising an air storage tank, the air storage tank being connected to the compressor, the test method comprising:

[0006] Controlling the compressor to charge the gas into the gas storage tank, and obtaining a current variation curve of the compressor current varying with time and a first pressure variation curve of the gas storage tank pressure varying with time;

[0007] Obtaining the starting current of the compressor according to the current variation curve, and obtaining the inflation time, limiting air pressure and normal output flow of the compressor according to the first pressure variation curve;

[0008] Controlling the compressor to discharge the gas in the gas storage tank, and obtaining a second pressure change curve of the pressure of the gas storage tank changing with time;

[0009] The exhaust time and residual pressure of the compressor are obtained according to the second pressure variation curve.

[0010] The test method for an air suspension compressor according to an embodiment of the present invention has at least the following beneficial effects: an air tank is connected to a compressor, and the air tank is used to simulate multiple air springs in an air suspension. After the compressor is controlled to fill the air tank with gas, the current change curve of the compressor and the first pressure change curve of the air tank can be obtained, the maximum current is found from the current change curve to obtain the starting current of the compressor, the time taken for the pressure to rise from 0 to the normal working pressure is intercepted from the first pressure change curve of the air tank, and the inflation time of the multiple air springs by the compressor can be obtained, the maximum pressure value is found from the first pressure change curve to obtain the limiting air pressure of the compressor, a point is taken on the first pressure change curve to obtain the corresponding pressure and time, and then the compressor can be calculated. conventional output flow; thereafter, the compressor is controlled to discharge the gas from the air tank, and a second pressure change curve of the air tank can be obtained. The time taken for the pressure to drop from the normal working pressure to the standby pressure corresponding to the low-power standby operation of the compressor can be intercepted from the second pressure change curve to obtain the exhaust time, and the residual pressure of the compressor can be obtained by finding the minimum pressure value from the second pressure change curve; therefore, the starting power supply, inflation time, limiting air pressure, conventional output flow, exhaust time and residual pressure and other parameters of the compressor can be tested through the above process, and the operating status of the compressor inflation process and exhaust process can be tested, which can quickly and accurately measure the various functions of the compressor of the air suspension to meet the needs of rapid development of the air suspension.

[0011] According to some embodiments of the present invention, the air suspension further includes a pressure boosting device, the pressure boosting device is connected to the air storage tank, and the testing method further includes:

[0012] Controlling the compressor and the boosting device to charge the gas into the gas storage tank, and obtaining a third pressure variation curve of the pressure of the gas storage tank varying with time;

[0013] The boost output flow rate of the compressor is obtained according to the third pressure variation curve.

[0014] According to some embodiments of the present invention, the boosting device includes a boosting pump and a boosting tank, the boosting pump is connected to the boosting tank, the test system further includes a pressure limiting valve, the boosting tank, the pressure limiting valve, and the gas storage tank are connected in sequence;

[0015] The step of controlling the compressor and the boosting device to charge the gas into the gas storage tank comprises:

[0016] obtaining a fifth pressure of the boost tank;

[0017] When the fifth pressure is less than or equal to the third preset pressure, controlling the boost pump to pressurize the boost tank, and the third preset pressure is greater than or equal to the second preset pressure;

[0018] When the fifth pressure is greater than the fourth preset pressure, the boost pump is controlled to be turned off, and the fourth preset pressure is greater than the third preset pressure;

[0019] The pressure-limiting valve is controlled to limit the air pressure outputted from the boosting tank to the air storage tank to the second preset pressure.

[0020] According to some embodiments of the present invention, obtaining the boost output flow of the compressor according to the third pressure change curve includes:

[0021] Obtaining a third point and a fourth point according to the third pressure change curve, obtaining a third pressure and a third time according to the third point, and obtaining a fourth pressure and a fourth time according to the fourth point;

[0022] The boost output flow is obtained by the following formula:

[0023] Q2=V×60×(P4-P3)×T0 / [(t4-t3)×P0×T1];

[0024] Among them, Q2 is the boost output flow, V is the volume of the gas tank, P3 is the third pressure, P4 is the fourth pressure, T0 is the ambient temperature, t3 is the third moment, t4 is the fourth moment, P0 is the ambient pressure, and T1 is the temperature of the gas tank.

[0025] According to some embodiments of the present invention, the testing method further includes:

[0026] Controlling the compressor to charge the gas into the gas storage tank to obtain a sixth pressure of the gas storage tank;

[0027] Obtaining a lower limit switch pressure according to preset data of the compressor;

[0028] When the sixth pressure rises to the lower limit switch pressure, the compressor is controlled to discharge the gas in the gas storage tank, and it is determined whether the sixth pressure drops to the residual pressure;

[0029] When it is determined that the sixth pressure drops to the residual pressure, it is determined that the exhaust function of the compressor is normal.

[0030] According to some embodiments of the present invention, obtaining the inflation time, limiting air pressure and normal output flow rate of the compressor according to the first pressure change curve includes:

[0031] A first time for the pressure to rise from 0 to a first preset pressure is obtained according to the first pressure change curve, and the first time is set as the inflation time.

[0032] According to some embodiments of the present invention, obtaining the inflation time, limiting air pressure and normal output flow rate of the compressor according to the first pressure change curve includes:

[0033] A pressure upper limit value is obtained according to the first pressure change curve, and the pressure upper limit value is set as the limiting air pressure.

[0034] According to some embodiments of the present invention, obtaining the inflation time, limiting air pressure and normal output flow rate of the compressor according to the first pressure change curve includes:

[0035] Obtain a first point and a second point according to the first pressure change curve, obtain a first pressure and a first time according to the first point, and obtain a second pressure and a second time according to the second point;

[0036] The normal output flow is obtained by the following formula:

[0037] Q1=V×60×(P2-P1)×T0 / [(t2-t1)×P0×T1];

[0038] Among them, Q1 is the normal output flow, V is the volume of the gas storage tank, P1 is the first pressure, P2 is the second pressure, T0 is the ambient temperature, t1 is the first moment, t2 is the second moment, P0 is the ambient pressure, and T1 is the temperature of the gas storage tank.

[0039] According to some embodiments of the present invention, obtaining the exhaust time and the residual pressure of the compressor according to the second pressure change curve includes:

[0040] A second time for the pressure to drop from the fifth preset pressure to the sixth preset pressure is obtained according to the second pressure change curve, and the second time is set as the exhaust time.

[0041] According to some embodiments of the present invention, obtaining the exhaust time and the residual pressure of the compressor according to the second pressure change curve includes:

[0042] A lower pressure limit value is obtained according to the second pressure change curve, and when the duration of the lower pressure limit value is greater than or equal to a preset time, the lower pressure limit value is set to a residual pressure.

[0043] According to some embodiments of the present invention, the test system further includes a display screen, and the test method includes:

[0044] The display screen is controlled to display the starting current, the inflation time, the limiting air pressure, the normal output flow, the exhaust time and the residual pressure.

[0045] A test system according to a second aspect of an embodiment of the present invention includes a controller, wherein the controller includes:

[0046] at least one processor;

[0047] and a memory storing instructions, which, when executed by at least one processor, execute the test method for the air suspension compressor described in the first aspect embodiment.

[0048] The test system according to the embodiment of the present invention has at least the following beneficial effects: the test method for the air suspension compressor can be used to test parameters such as the compressor's starting power supply, inflation time, limiting air pressure, normal output flow, exhaust time and residual pressure, and the operating status of the compressor's inflation process and exhaust process can be tested, and the various functions of the air suspension compressor can be measured quickly and accurately to meet the needs of rapid development of air suspension.

[0049] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a flow chart of a testing method for an air suspension compressor according to an embodiment of the present invention;

[0051] Figure 2 is a flow chart for obtaining the inflation time, the limiting air pressure and the normal output flow rate in one embodiment of the present invention;

[0052] Figure 3 is a flow chart for obtaining exhaust time and residual pressure in one embodiment of the present invention;

[0053] Figure 4 is a flow chart for obtaining a boost output flow rate in one embodiment of the present invention;

[0054] Figure 5 is a flow chart of maintaining the gas pressure outputted from the booster tank to the gas storage tank at a second preset pressure in one embodiment of the present invention;

[0055] Figure 6 is a flow chart for calculating the boost output flow rate in one embodiment of the present invention;

[0056] Figure 7 is a flow chart of testing the exhaust function of a compressor in one embodiment of the present invention;

[0057] Figure 8 It is a schematic structural diagram of a test system for an air suspension compressor according to an embodiment of the present invention.

[0058] Figure numerals: filter 100, compressor 200, air storage tank 300, boosting device 400, boosting pump 410, boosting tank 420, pressure limiting valve 500, display screen 600, host computer 601, controller 700, air switch 710, DC power supply 720, contact switch 730, first solenoid valve 740, second solenoid valve 750, third solenoid valve 760, first pressure sensor 770, first temperature sensor 771, current sensor 780, second temperature sensor 781, second pressure sensor 782, third pressure sensor 783, third temperature sensor 784. DETAILED DESCRIPTION

[0059] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0060] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as front, rear, top, bottom, axial, and circumferential are based on the orientations or positional relationships shown in the accompanying drawings and are 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, and therefore cannot be understood as a limitation on the present invention.

[0061] In the description of the present invention, the meaning of "above", "below", "exceed", etc. is not inclusive of the number itself, and the meaning of "above", "below", "within", etc. is inclusive of the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0062] In the description of the present invention, it should be noted that the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0063] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments.

[0064] Air suspension uses a compressor to generate compressed air. The corresponding compressor and exhaust valve are controlled according to the change in vehicle height to inflate or deflate the air spring, thereby raising or lowering the ground clearance of the vehicle chassis to increase high-speed vehicle stability or passability on complex roads. As users' requirements for driving comfort increase, more and more vehicles are equipped with air suspension. Compared with traditional suspension, due to the more complex structure of air suspension, the probability and frequency of failure will be higher than that of traditional coil spring suspension systems. Therefore, it is necessary to test the various functions of the air suspension compressor during the development stage to detect whether the performance of the compressor during use meets the requirements.

[0065] At present, the schemes for testing air suspension compressors in related technologies are generally designed to verify the durability of the compressors. There is a lack of test methods specifically for testing the various functional parameters of the compressors, which makes it difficult to adapt to the needs of rapid development of air suspensions. For example, in the development stage of air suspensions, it is necessary to test eight functions of the compressor, including inflation time, output flow, residual pressure, limited air pressure, lower limit switch pressure, exhaust time, starting current, and output flow in boost mode, in order to accurately obtain the various functional parameters of the compressor, and then develop air suspension based on the functional parameters of the compressor and optimize the design ideas of the air suspension.

[0066] Based on this, an embodiment of the present invention provides a testing method for an air suspension compressor. During the process of the compressor 200 inflating the air tank 300, a current change curve of the compressor 200 and a first pressure change curve of the air tank 300 are obtained. During the process of the compressor 200 discharging the gas from the air tank 300, a second pressure change curve of the air tank 300 is obtained. The starting current of the compressor 200 is obtained through the current change curve, the inflation time, limiting air pressure and normal output flow of the compressor 200 are obtained through the first pressure change curve, and the exhaust time and residual pressure of the compressor 200 are obtained through the second pressure change curve. The various functional conditions of the compressor 200 of the air suspension can be measured quickly and accurately to meet the needs of rapid development of the air suspension.

[0067] refer to Figures 1 to 7 A test method for an air suspension compressor according to an embodiment of the present invention is described. The test method is applicable to a compressor of a vehicle air suspension. The test method is applicable to a test system for an air suspension compressor, wherein the test system includes an air tank 300. During the test of the compressor 200, the air tank 300 and the compressor 200 need to be connected. The volume of the air tank 300 is equal to the sum of all air spring containers in the air suspension, so that the test system can simulate the normal operation of the compressor 200 in the air suspension. The test method for an air suspension compressor is described below using a specific example.

[0068] Reference Figure 1 As shown, the test method for an air suspension compressor according to an embodiment of the present invention includes but is not limited to the following steps.

[0069] Step S100 , controlling the compressor 200 to charge the gas into the gas storage tank 300 , and obtaining a current variation curve of the compressor 200 with time and a first pressure variation curve of the pressure of the gas storage tank 300 with time.

[0070] The compressor 200 is a test object. After the compressor 200 is connected to the gas storage tank 300, the compressor 200 is controlled to fill the gas into the gas storage tank 300.

[0071] The current of the compressor 200 is measured by a current sensor, and a curve showing the change of the current of the compressor 200 over time is recorded as a current change curve.

[0072] A pressure sensor is provided in the gas storage tank 300 to measure the pressure of the gas storage tank 300 , and a curve showing the pressure of the gas storage tank 300 changing with time is recorded as a first pressure change curve.

[0073] Step S200, obtaining the starting current of the compressor 200 according to the current variation curve, and obtaining the charging time, limiting air pressure and normal output flow of the compressor 200 according to the first pressure variation curve.

[0074] The current variation curve describes the current variation during the inflation process of the compressor 200. The instantaneous current value when the compressor 200 starts and begins to inflate is the largest, and the starting current can be obtained based on the maximum current value.

[0075] The first pressure change curve describes the pressure change during the inflation process of the air tank 300. The target pressure can be set according to the pressure of the air springs in the air suspension after inflation. Since the volume of the air tank 300 is equal to the sum of the volumes of all the air springs in the air suspension, the compressor 200 inflating the air tank 300 can simulate the situation where the compressor 200 inflates all the air springs of the air suspension. The time taken from the start of inflation by the compressor 200 to the pressure of the air tank 300 reaching the target pressure is recorded. This time is equal to the time taken for the compressor 200 to inflate multiple air springs and reach the target pressure, which is the inflation time.

[0076] Furthermore, after the compressor 200 inflates the gas tank 300, the pressure of the gas tank 300 continues to increase. When the pressure of the gas tank 300 reaches a certain value, the safety valve inside the compressor 200 connected to the gas tank 300 will be opened intermittently. At this time, the pressure of the gas tank 300 will drop. Therefore, the highest pressure value recorded in the first pressure change curve is the limiting air pressure of the compressor 200.

[0077] The first pressure change curve records the process of the pressure value rising from 0 to the limiting air pressure. The limiting air pressure is used as the boundary. Any two or more state points are selected between 0 and the limiting air pressure of the first pressure change curve. Each state point records the corresponding time and pressure. The normal output flow of the compressor 200 during the inflation process is calculated by the time difference and pressure difference between any two state points and the volume of the air storage tank 300.

[0078] The curve generated in the normal mode with the pressure of the gas storage tank 300 as the horizontal coordinate and the boost output flow rate of the compressor 200 as the vertical coordinate is the normal output curve.

[0079] Step S300, controlling the compressor 200 to discharge the gas in the gas storage tank 300, and obtaining a second pressure change curve of the pressure of the gas storage tank 300 changing with time.

[0080] A pressure sensor is provided in the gas storage tank 300 to measure the pressure of the gas storage tank 300. During the process of the compressor 200 discharging the gas in the gas storage tank 300, a curve of the pressure change of the gas storage tank 300 over time is recorded as a second pressure change curve.

[0081] Since the compressor 200 first inflates the gas storage tank 300 and then exhausts the gas, the second pressure variation curve records the process in which the pressure value gradually decreases from the limiting air pressure.

[0082] Step S400, obtaining the exhaust time and residual pressure of the compressor 200 according to the second pressure variation curve.

[0083] The second pressure change curve describes the pressure change during the exhaust process of the air tank 300. Since the volume of the air tank 300 is equal to the sum of the volumes of all air springs in the air suspension, the compressor 200 discharging the gas from the air tank 300 can simulate the situation where the compressor 200 discharges the gas from all air springs of the air suspension.

[0084] The air spring in the air suspension generally does not operate at the extreme limit air pressure during operation, so the operating pressure can be set according to the normal operating pressure of the air spring in the air suspension, and the time corresponding to the operating pressure can be found in the second pressure change curve of the air tank 300 as the exhaust start time.

[0085] Furthermore, when the vehicle is running normally, the air spring of the air suspension will maintain a certain pressure to avoid damage to the air spring. Therefore, this pressure is used as the maintenance pressure, and the time corresponding to the maintenance pressure is found in the second pressure change curve of the air tank 300 as the exhaust termination time.

[0086] The time taken to change from the operating pressure to the maintaining pressure is found from the second pressure variation curve, that is, the difference between the exhaust start time and the exhaust end time, and this time is the exhaust time.

[0087] As the compressor 200 continuously discharges the gas from the gas tank 300, the pressure of the gas tank 300 continues to decrease from the maintenance pressure, and the gas tank 300 continues to exhaust. Due to the resistance of the exhaust valve of the compressor 200, the gas inside the gas tank 300 will not be completely discharged. When the pressure in the gas tank 300 no longer decreases and remains for a certain period of time, a pressure value that no longer decreases can be recorded in the second pressure change curve, that is, a horizontal straight line appears on the second pressure change curve, and the pressure value corresponding to the straight line is the residual pressure of the compressor 200.

[0088] Therefore, through the above process, parameters such as the starting power supply, inflation time, limiting air pressure, normal output flow, exhaust time and residual pressure of the compressor 200 can be tested, and the operating status of the inflation process and the exhaust process of the compressor 200 can be tested, and the various functions of the compressor 200 of the air suspension can be measured quickly and accurately to meet the needs of rapid development of the air suspension.

[0089] After obtaining the above parameters, the gas storage tank 300 is controlled to open, and the gas in the gas storage tank 300 is completely discharged, so that the pressure in the gas storage tank 300 drops to the external atmospheric pressure 0, so as to restore the test system.

[0090] In some embodiments, reference Figure 2 As shown, step S200, and obtaining the charging time, limiting air pressure and normal output flow of the compressor 200 according to the first pressure change curve, includes the following steps.

[0091] Step S210, obtaining a first time for the pressure to rise from 0 to a first preset pressure according to the first pressure change curve, and setting the first time as the inflation time.

[0092] The first preset pressure can be set according to the preset parameters of the air suspension, and is set as the first preset pressure according to the pressure required for the air springs in the air suspension to be inflated to normal operation. The first pressure change curve describes the pressure change during the inflation process of the air tank 300. Since the volume of the air tank 300 is equal to the sum of the volumes of all the air springs in the air suspension, the compressor 200 inflating the air tank 300 can simulate the situation where the compressor 200 inflates all the air springs of the air suspension. The time taken from the start of inflation by the compressor 200 to the pressure of the air tank 300 reaching the first preset pressure is recorded, that is, the first time taken for the pressure to increase from 0 to the first preset pressure. The first time is equal to the time taken for the compressor 200 to inflate multiple air springs and reach the pressure required for normal operation. The first time is the inflation time.

[0093] In some embodiments, reference Figure 2As shown, step S200, and obtaining the charging time, limiting air pressure and normal output flow of the compressor 200 according to the first pressure change curve, also includes the following steps.

[0094] Step S220, obtaining a pressure upper limit value according to the first pressure change curve, and setting the pressure upper limit value as a limiting air pressure.

[0095] After the compressor 200 inflates the air tank 300, the pressure of the air tank 300 continues to increase. When the pressure of the air tank 300 reaches a certain value, the safety valve inside the compressor 200 connected to the air tank 300 will be opened intermittently. At this time, the pressure of the air tank 300 will drop. Therefore, the upper limit value of pressure recorded in the first pressure change curve is the limiting air pressure of the compressor 200.

[0096] In some embodiments, reference Figure 2 As shown, step S200, and obtaining the charging time, limiting air pressure and normal output flow of the compressor 200 according to the first pressure change curve, also includes the following steps.

[0097] Step S230, obtaining a first point and a second point according to the first pressure change curve, obtaining a first pressure and a first time according to the first point, and obtaining a second pressure and a second time according to the second point.

[0098] Two points are randomly selected in the first pressure change curve as the first point and the second point. The first point includes the first pressure P1 and its corresponding first moment t1, and the second point includes the second pressure P2 and its corresponding second moment t2. The first point and the second point are two moments in the inflation process of the air tank 300, simulating two moments in the process of the compressor 200 inflating multiple air springs. The second pressure P2 is greater than the first pressure P1, and the second moment t2 is greater than the first moment t1.

[0099] Step S231, obtain the normal output flow rate by the following formula:

[0100] Q1=V×60×(P2-P1)×T0 / [(t2-t1)×P0×T1];

[0101] Among them, Q1 is the normal output flow rate, the unit is liter per minute (L / min); V is the volume of the gas tank 300, the unit is liter (L); P1 is the first pressure, the unit is bar (bar); P2 is the second pressure, the unit is bar (bar); T0 is the ambient temperature, the unit is Kelvin (K); t1 is the first moment, the unit is second (s); t2 is the second moment, the unit is second (s); P0 is the ambient pressure, the unit is bar (bar); T1 is the temperature of the gas tank 300, the unit is Kelvin (K).

[0102] By using the pressure difference and interval time between the second sampling point and the first sampling point, a temperature sensor is set to obtain the external environment temperature, another temperature sensor is set to obtain the temperature of the gas storage tank 300, and a pressure sensor is set to obtain the pressure of the external environment. The volume of the gas storage tank 300 is known.

[0103] In some embodiments, reference Figure 3 As shown, step S400, obtaining the exhaust time and residual pressure of the compressor 200 according to the second pressure change curve, includes the following steps.

[0104] Step S410, obtaining a second time for the pressure to drop from the fifth preset pressure to the sixth preset pressure according to the second pressure change curve, and setting the second time as the exhaust time.

[0105] The second pressure change curve describes the pressure change during the exhaust process of the air tank 300. Since the volume of the air tank 300 is equal to the sum of the volumes of all air springs in the air suspension, the compressor 200 discharging the gas from the air tank 300 can simulate the situation where the compressor 200 discharges the gas from all air springs of the air suspension.

[0106] The air spring in the air suspension generally does not operate at the ultimate restricted air pressure during operation, so the fifth preset pressure can be set according to the normal operating pressure of the air spring in the air suspension, and the moment corresponding to the fifth preset pressure can be found in the second pressure change curve of the air tank 300 as the exhaust start time.

[0107] Furthermore, when the vehicle is driving normally, the air spring of the air suspension will maintain a certain pressure to avoid damage to the air spring. Therefore, this pressure is used as the sixth preset pressure, and the moment corresponding to the sixth preset pressure is found in the second pressure change curve of the air tank 300 as the exhaust termination moment.

[0108] The time taken to change from the fifth preset pressure to the sixth preset pressure is found from the second pressure change curve, that is, the difference between the exhaust start time and the exhaust end time, and this time is the exhaust time.

[0109] The fifth preset pressure and the sixth preset pressure are set according to actual conditions of the air suspension.

[0110] In some embodiments, reference Figure 3 As shown, step S400, the exhaust time and residual pressure of the compressor 200 are obtained according to the second pressure change curve, and the following steps are also included.

[0111] Step S420, obtaining a lower pressure limit value according to the second pressure change curve, and when the duration of the lower pressure limit value is greater than or equal to a preset time, setting the lower pressure limit value to the residual pressure.

[0112] As the compressor 200 continuously discharges the gas from the gas tank 300, the pressure of the gas tank 300 continues to decrease from the sixth preset pressure, and the gas tank 300 continues to be exhausted. Due to the resistance of the exhaust valve of the compressor 200, the gas inside the gas tank 300 will not be completely discharged. When the pressure in the gas tank 300 no longer decreases and remains for a certain period of time, the lower limit value of the pressure that no longer decreases can be recorded in the second pressure change curve, that is, a horizontal straight line appears on the second pressure change curve, and the lower limit value of the pressure corresponding to the straight line is the residual pressure of the compressor 200.

[0113] In some embodiments, the air suspension is further provided with a booster device 400, which is connected to the air tank 300, that is, simulating the situation where the booster device 400 is connected to multiple air springs, so that the test system simulates the normal operation of the booster device 400 in the air suspension. Figure 4 As shown, the test method further includes the following steps.

[0114] Step S500, controlling the compressor 200 and the boosting device 400 to charge the gas into the gas storage tank 300, and obtaining a third pressure variation curve of the pressure of the gas storage tank 300 varying with time.

[0115] The boost device 400 is one of the components in the air suspension. In the air suspension, the boost device 400 and the compressor 200 together charge the air into the air spring so as to increase the air pressure or charging rate of the air spring.

[0116] In this embodiment, the boosting device 400 and the compressor 200 jointly inflate the air storage tank 300 , thereby simulating a situation in which the boosting device 400 and the compressor 200 jointly inflate a plurality of air springs.

[0117] A pressure sensor is provided to measure the pressure of the gas storage tank 300, and a curve showing pressure variation over time is obtained as a third pressure variation curve.

[0118] Step S600, obtaining the boost output flow of the compressor 200 according to the third pressure variation curve.

[0119] The third pressure change curve records the process of the pressure value rising from 0 to the limiting air pressure. The limiting air pressure is used as the boundary. Any two or more state points are selected between 0 and the limiting air pressure of the third pressure change curve. Each state point records the corresponding time and pressure. The boost output flow rate of the compressor 200 during the inflation process is calculated by the time difference and pressure difference between any two state points and the volume of the air storage tank 300.

[0120] The curve generated by the boost mode with the pressure of the gas storage tank 300 as the horizontal coordinate and the boost output flow rate of the compressor 200 as the vertical coordinate is the boost output curve. The boost output curve of the boost mode is different from the normal output curve of the normal mode.

[0121] In some embodiments, the boosting device 400 includes a boosting pump 410 and a boosting tank 420, the boosting pump 410 is connected to the boosting tank 420, and the test system also includes a pressure limiting valve 500, and the boosting tank 420, the pressure limiting valve 500, and the gas storage tank 300 are connected in sequence.

[0122] Reference Figure 5 As shown, step S500, controlling the compressor 200 and the boosting device 400 to charge the gas into the gas storage tank 300, includes the following steps.

[0123] Step S510, obtaining the fifth pressure of the boost tank 420.

[0124] A pressure sensor is provided to measure the pressure of the boost tank 420 and record it as the fifth pressure, so as to monitor the pressure change of the boost tank 420 at all times.

[0125] Step S520, when the fifth pressure is less than or equal to the third preset pressure, control the boosting pump 410 to pressurize the boosting tank 420, and the third preset pressure is greater than or equal to the second preset pressure.

[0126] In order to avoid the pressure of the boosting tank 420 being too low, which would cause the pressure of the gas delivered from the boosting tank 420 to the gas storage tank 300 to be too low and affect the normal boosting process, the second preset pressure is set as the minimum pressure of the gas input from the boosting tank 420 to the gas storage tank 300. Therefore, it is necessary to set the third preset pressure, which is not less than the second preset pressure. When the fifth pressure of the boosting tank 420 is not greater than the third preset pressure, the boosting pump 410 pressurizes the boosting tank 420 to increase the fifth pressure.

[0127] Step S530: when the fifth pressure is greater than the fourth preset pressure, the boost pump 410 is controlled to be turned off, and the fourth preset pressure is greater than the third preset pressure.

[0128] In order to avoid the pressure of the boosting tank 420 being too high, which would cause the pressure of the gas delivered from the boosting tank 420 to the gas storage tank 300 to be too high and affect the normal boosting process, the fourth preset pressure is set as the upper limit of the pressure of the gas input from the boosting tank 420 to the gas storage tank 300. When the fifth pressure of the boosting tank 420 exceeds the fourth preset pressure, the boosting pump 410 is turned off to reduce the fifth pressure.

[0129] Step S540: Control the pressure-limiting valve 500 to limit the gas pressure outputted from the boosting tank 420 to the gas storage tank 300 to a second preset pressure.

[0130] The pressure limiting valve 500 is set to limit the gas pressure delivered from the boost tank 420 to the gas storage tank 300, ensuring that the gas pressure delivered from the boost tank 420 to the gas storage tank 300 is maintained at a second preset pressure to simulate the gas pressure of the boost device 400 in the air suspension to fill gas into multiple air springs.

[0131] In some embodiments, reference Figure 6 As shown, step S600, obtaining the boost output flow of the compressor 200 according to the third pressure change curve, includes the following steps.

[0132] Step S610, obtaining a third point and a fourth point according to the third pressure change curve, obtaining a third pressure and a third time according to the third point, and obtaining a fourth pressure and a fourth time according to the fourth point.

[0133] Any two points are selected from the third pressure change curve as the third point and the fourth point. The third point includes the third pressure P3 and its corresponding third moment t3. The fourth point includes the fourth pressure P4 and its corresponding fourth moment t3. The third point and the fourth point are two moments in the pressurized inflation process of the air tank 300, simulating two moments in the process of the boosting device 400 and the compressor 200 inflating multiple air springs. The fourth pressure P4 is greater than the third pressure P3, and the fourth moment t4 is greater than the third moment t3.

[0134] Step S620, the boost output flow is obtained by the following formula:

[0135] Q2=V×60×(P4-P3)×T0 / [(t4-t3)×P0×T1];

[0136] Among them, Q2 is the boost output flow rate, in liters per minute (L / min); V is the volume of the gas tank 300, in liters (L); P3 is the third pressure, in bar; P4 is the fourth pressure, in bar; T0 is the ambient temperature, in Kelvin (K); t3 is the third moment, in seconds (s); t4 is the fourth moment, in seconds (s); P0 is the ambient pressure, in bar; T1 is the temperature of the gas tank 300, in Kelvin (K).

[0137] Through the pressure difference and interval time between the fourth and third points, a temperature sensor is set to obtain the external environment temperature, another temperature sensor is set to obtain the temperature of the gas storage tank 300, and a pressure sensor is set to obtain the pressure of the external environment. The volume of the gas storage tank 300 is known.

[0138] In some embodiments, the testing method further comprises the following steps.

[0139] Step S700 , controlling the compressor 200 to charge the gas into the gas storage tank 300 , and obtaining a sixth pressure of the gas storage tank 300 .

[0140] The compressor 200 charges the air tank 300 to simulate the process of the compressor 200 charging multiple air springs, and a pressure sensor is provided to measure the pressure of the air tank 300 to obtain a sixth pressure, so as to accurately monitor the pressure change of the air tank 300.

[0141] Step S800 , obtaining a lower limit switch pressure according to preset data of the compressor 200 .

[0142] The model of the compressor 200 determines its lower limit switching pressure, and the lower limit switching pressure is the minimum pressure for the compressor 200 to operate normally after starting.

[0143] Step S900, when the sixth pressure rises to the lower limit switch pressure, the compressor 200 is controlled to discharge the gas in the gas storage tank 300, and it is determined whether the sixth pressure drops to the residual pressure.

[0144] After setting the lower limit switch pressure, the compressor 200 is controlled to start and the sixth pressure of the gas tank 300 is increased. When the sixth pressure reaches the lower limit switch pressure, the compressor 200 is controlled to discharge the gas in the gas tank 300, thereby verifying the condition of the compressor 200 operating at the lower limit switch pressure.

[0145] Furthermore, the compressor 200 in the lower limit switch pressure operation state discharges the gas in the gas tank 300, and the gas inside the gas tank 300 is discharged through the compressor 200. When the compressor 200 operates normally, the pressure of the gas tank 300 is reduced to the residual pressure.

[0146] In step S1000, when it is determined that the sixth pressure drops to the residual pressure, it is determined that the exhaust function of the compressor 200 is normal.

[0147] Only when the sixth pressure drops to the residual pressure can it be determined that the exhaust function of the compressor 200 in the lower limit switch pressure operating state is normal.

[0148] In some embodiments, the test system is further provided with a display screen 600. The test method further includes the following steps.

[0149] The control display screen 600 displays the starting current, inflation time, limit air pressure, normal output flow, exhaust time and residual pressure.

[0150] The display screen 600 displays various functional parameters of the compressor 200, so that the tester can intuitively judge the test status of the compressor 200 and find abnormal parameters in time.

[0151] Reference Figure 8As shown, the test system includes a controller, which includes at least one processor; and a memory storing instructions, which, when executed by at least one processor, executes the test method for the air suspension compressor as described above.

[0152] Take the example that the processor and memory in the controller can be connected through a bus. The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk memory, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely arranged relative to the control processor, and these remote memories may be connected to the controller via a network.

[0153] The non-transient software program and instructions required to implement the test method of the above embodiment are stored in the memory. When executed by the processor, the test method of the above embodiment is executed, for example, the test method described above is executed. Figure 1 Steps S100 to S400 of the method, Figure 2 Steps S210 to S231 of the method, Figure 3 Steps S410 to S420 of the method, Figure 4 Steps S500 to S600 of the method, Figure 5 Steps S510 to S540 of the method, Figure 6 Steps S610 to S620 of the method, Figure 7 Method steps S700 to S1000.

[0154] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0155] Reference Figure 8 As shown, the air suspension includes a filter 100 , a compressor 200 , an air storage tank 300 , and a boost device 400 .

[0156] The boosting device 400 includes a boosting pump 410 and a boosting tank 420 .

[0157] The test system includes a pressure limiting valve 500, a display screen 600, a host computer 601, a controller 700, an air switch 710, a DC power supply 720, a contact switch 730, a first solenoid valve 740, a second solenoid valve 750, a third solenoid valve 760, a first pressure sensor 770, a first temperature sensor 771, a current sensor 780, a second temperature sensor 781, a second pressure sensor 782, a third pressure sensor 783, and a third temperature sensor 784.

[0158] The filter 100, the compressor 200, the air tank 300, and the third solenoid valve 760 are connected in sequence, and the first solenoid valve 740, the boosting pump 410, the boosting tank 420, the second solenoid valve 750, the pressure limiting valve 500, and the air tank 300 are connected in sequence.

[0159] External air is filtered by the filter 100 and then enters the compressor 200 . External air enters the boost pump 410 through the first solenoid valve 740 . The gas in the gas storage tank 300 is discharged to the outside through the third solenoid valve 760 . The compressor 200 is provided with an exhaust valve to discharge the gas.

[0160] The current sensor 780 is provided to measure the current of the compressor 200 , and the second temperature sensor 781 is provided to measure the temperature of the compressor 200 .

[0161] The first pressure sensor 770 is provided to measure the pressure of the gas storage tank 300 , and the first temperature sensor 771 is provided to measure the temperature of the gas storage tank 300 .

[0162] A second pressure sensor 782 is provided to measure the pressure of the boost tank 420 .

[0163] The third pressure sensor 783 is provided to measure the external environmental pressure, and the third temperature sensor 784 is provided to measure the external environmental temperature.

[0164] The DC power supply 720 is electrically connected to the air switch 710 , the DC power supply 720 is electrically connected to the contact switch 730 , the contact switch 730 is electrically connected to the current sensor 780 , the current sensor is electrically connected to the compressor 200 , and the DC power supply 720 supplies power to the compressor 200 .

[0165] The controller 700 is electrically connected to the DC power supply 720, the contact switch 730, the current sensor 780, the second temperature sensor 781, the exhaust valve of the compressor 200, the host computer 601, the first solenoid valve 740, the second solenoid valve 750, the third solenoid valve 760, the first pressure sensor 770, the first temperature sensor 771, the second pressure sensor 782, the third pressure sensor 783 and the third temperature sensor 784 respectively.

[0166] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A test method for an air suspension compressor, characterized in that: A test system for an air suspension compressor, the test system comprising an air storage tank connected to the compressor, the air suspension further comprising a booster connected to the air storage tank, and the test method comprising: Controlling the compressor to charge the gas into the gas storage tank, and obtaining a current variation curve of the compressor current varying with time and a first pressure variation curve of the gas storage tank pressure varying with time; Obtaining the starting current of the compressor according to the current variation curve, and obtaining the inflation time, limiting air pressure and normal output flow of the compressor according to the first pressure variation curve; Controlling the compressor to discharge the gas in the gas storage tank, and obtaining a second pressure change curve of the pressure of the gas storage tank changing with time; Obtaining the exhaust time and residual pressure of the compressor according to the second pressure change curve; Controlling the compressor and the boosting device to charge the gas into the gas storage tank, and obtaining a third pressure variation curve of the pressure of the gas storage tank varying with time; The boost output flow rate of the compressor is obtained according to the third pressure variation curve.

2. The test method for an air suspension compressor according to claim 1, characterized in that: The boosting device includes a boosting pump and a boosting tank, the boosting pump is connected to the boosting tank, the test system also includes a pressure limiting valve, the boosting tank, the pressure limiting valve, and the gas storage tank are connected in sequence; The step of controlling the compressor and the boosting device to charge the gas into the gas storage tank comprises: obtaining a fifth pressure of the boost tank; When the fifth pressure is less than or equal to the third preset pressure, controlling the boost pump to pressurize the boost tank, and the third preset pressure is greater than or equal to the second preset pressure; When the fifth pressure is greater than the fourth preset pressure, the boost pump is controlled to be turned off, and the fourth preset pressure is greater than the third preset pressure; The pressure-limiting valve is controlled to limit the air pressure outputted from the boosting tank to the air storage tank to the second preset pressure.

3. The test method for an air suspension compressor according to claim 1, characterized in that: The step of obtaining the boost output flow rate of the compressor according to the third pressure change curve comprises: Obtaining a third point and a fourth point according to the third pressure change curve, obtaining a third pressure and a third time according to the third point, and obtaining a fourth pressure and a fourth time according to the fourth point; The boost output flow is obtained by the following formula: Q2=V×60×(P4-P3)×T0 / [(t4-t3)×P0×T1]; Among them, Q2 is the boost output flow, V is the volume of the gas tank, P3 is the third pressure, P4 is the fourth pressure, T0 is the ambient temperature, t3 is the third moment, t4 is the fourth moment, P0 is the ambient pressure, and T1 is the temperature of the gas tank.

4. The test method for an air suspension compressor according to claim 1, characterized in that: The testing method further comprises: Controlling the compressor to charge the gas into the gas storage tank to obtain a sixth pressure of the gas storage tank; Obtaining a lower limit switch pressure according to preset data of the compressor; When the sixth pressure rises to the lower limit switch pressure, the compressor is controlled to discharge the gas in the gas storage tank, and it is determined whether the sixth pressure drops to the residual pressure; When it is determined that the sixth pressure drops to the residual pressure, it is determined that the exhaust function of the compressor is normal.

5. The test method for an air suspension compressor according to claim 1, characterized in that: The step of obtaining the inflation time, the limiting air pressure and the normal output flow rate of the compressor according to the first pressure variation curve includes: A first time for the pressure to rise from 0 to a first preset pressure is obtained according to the first pressure change curve, and the first time is set as the inflation time.

6. The test method for an air suspension compressor according to claim 1, characterized in that: The step of obtaining the inflation time, the limiting air pressure and the normal output flow rate of the compressor according to the first pressure variation curve includes: A pressure upper limit value is obtained according to the first pressure change curve, and the pressure upper limit value is set as the limiting air pressure.

7. The test method for an air suspension compressor according to claim 1, characterized in that: The step of obtaining the inflation time, the limiting air pressure and the normal output flow rate of the compressor according to the first pressure variation curve includes: Obtain a first point and a second point according to the first pressure change curve, obtain a first pressure and a first time according to the first point, and obtain a second pressure and a second time according to the second point; The normal output flow is obtained by the following formula: Q1=V×60×(P2-P1)×T0 / [(t2-t1)×P0×T1]; Among them, Q1 is the normal output flow, V is the volume of the gas storage tank, P1 is the first pressure, P2 is the second pressure, T0 is the ambient temperature, t1 is the first moment, t2 is the second moment, P0 is the ambient pressure, and T1 is the temperature of the gas storage tank.

8. The test method for an air suspension compressor according to claim 1, characterized in that: The step of obtaining the exhaust time and residual pressure of the compressor according to the second pressure variation curve includes: A second time for the pressure to drop from the fifth preset pressure to the sixth preset pressure is obtained according to the second pressure change curve, and the second time is set as the exhaust time.

9. The test method for an air suspension compressor according to claim 1, characterized in that: The step of obtaining the exhaust time and residual pressure of the compressor according to the second pressure variation curve includes: A lower pressure limit value is obtained according to the second pressure change curve, and when the duration of the lower pressure limit value is greater than or equal to a preset time, the lower pressure limit value is set to a residual pressure.

10. The test method for an air suspension compressor according to claim 1, characterized in that: The test system also includes a display screen, and the test method includes: The display screen is controlled to display the starting current, the inflation time, the limiting air pressure, the normal output flow, the exhaust time and the residual pressure.

11. A testing system, characterized in that: A controller is included, the controller comprising: at least one processor; and a memory storing instructions, which, when executed by at least one processor, execute the test method for an air suspension compressor according to any one of claims 1 to 10.

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