Method and device for testing start-stop durability of air compressor for fuel cell

Abstract

The application discloses a fuel cell air compressor start-stop durability test method and device, and relates to the technical field of air compressor testing. The method comprises the following steps: obtaining test parameters of an air compressor; the test parameters comprise a target rotating speed; based on the test parameters, the air compressor is tested multiple times in a cycle control mode until a test end condition is met and the test is stopped; if the error between the actual motor rotating speed value of the motor of the air compressor after starting and the target rotating speed exceeds a preset range during each test, the air compressor is stopped, and it is determined that the test fails; the current failure rate is calculated after each test, and the current motor temperature of the air compressor is collected; the starting acceleration during the next test is adjusted according to the current motor temperature; and the test end condition comprises that the number of successful starts and stops reaches a target test number and the current failure rate is greater than a failure rate threshold. The application can improve the test efficiency of the fuel cell air compressor.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of air compressor testing, in particular to an air compressor start-stop durability test method and device for fuel cells. BACKGROUND

[0002] Due to the limitations of material science, pure electric vehicle batteries have problems such as low energy density, long charging time, short cruising range and the like, which limit the further development of the pure electric vehicles. The hydrogen fuel cell can convert the chemical energy in fuel hydrogen into electric energy through an electrochemical reaction while generating water, and therefore has the advantages of high energy conversion rate, clean reaction product, small operation noise, convenient and fast refueling and the like, and has a very broad application prospect. According to the current demand of fuel cell stacks, a high-pressure ratio, small-flow and low-noise air compressor is needed to realize stable air supply. The centrifugal air compressor has the advantages of small noise, compact structure and high power density, and has good comprehensive performance, and is the first choice for air supercharging of the cathode of a vehicle fuel cell.

[0003] When the centrifugal air compressor is working, the magnetic rotor is driven by the motor to rotate at a high speed, and the impeller at one end of the shaft drives the air to move at a high speed. At this time, the bearing plays a role of providing reliable support for the rotor. At present, in the use scene of the fuel cell air compressor for vehicles, the research and use of the gas bearing are mainly foil type dynamic pressure gas bearings. The foil type dynamic pressure gas bearing uses a flexible foil surface as support, uses gas as lubricating medium, and uses the gas dynamic pressure effect to generate support force for the shaft. When the external load changes, the foil support structure of the foil type dynamic pressure gas bearing can adjust the gas film gap through self-deformation, so that the shaft journal is in a dynamic balance state during rotation to maintain stable operation, and has the advantages of high speed, no pollution and good environmental adaptability. For the application scene of the vehicle fuel cell, there is a situation of rapid start and stop of the vehicle, and the vehicle needs to meet tens of thousands or even hundreds of thousands of start-stops within the service life range. If the air bearing has insufficient durability, it will cause severe vibration of the shaft journal, affect the stable air supply of the fuel cell cathode, and even cause friction or jamming between the shaft journal and the bearing wall, which seriously affects the use of the fuel cell air compressor. Therefore, the air bearing needs to have sufficient durability and reliability. Therefore, for the working condition of frequent and large start-stop of the fuel cell air compressor, the air compressor needs to be tested for durability before large-scale application, and the related test method has problems such as complex steps and long test time. SUMMARY

[0004] The purpose of the application is to provide an air compressor start-stop durability test method and device for fuel cells, which can improve the test efficiency.

[0005] To achieve the above-mentioned purpose, the application provides the following solutions:

[0006] In a first aspect, the application provides a method for testing the start-stop durability of an air compressor for a fuel cell, comprising:

[0007] obtaining a test parameter of the air compressor, wherein the test parameter comprises a target rotating speed;

[0008] based on the test parameter, performing multiple tests on the air compressor in a cycle control manner until a test end condition is met, wherein if an error between an actual motor rotating speed of the air compressor after starting and the target rotating speed exceeds a preset range, the air compressor is controlled to stop and the test is determined to fail, a current failure rate is calculated after each test, and a current motor temperature of the air compressor is collected, and a starting acceleration for the next test is adjusted according to the current motor temperature, and the test end condition comprises that a number of successful starts and stops reaches a target test number and the current failure rate is greater than a failure rate threshold.

[0009] Optionally, the test parameter further comprises a stopping acceleration, a rotating speed stabilization time, a temperature threshold, a failure rate threshold, and the target test number.

[0010] Optionally, based on the test parameter, the multiple tests are performed on the air compressor in the cycle control manner until the test end condition is met, and the method comprises the following steps:

[0011] calculating a starting time and a stopping time of the air compressor according to the starting acceleration of the current test;

[0012] starting the air compressor according to the starting acceleration of the current test, and starting a timer;

[0013] collecting an actual motor rotating speed of the air compressor when the starting time is reached;

[0014] determining whether an error between the actual motor rotating speed and the target rotating speed is within a preset range, to obtain a first determination result;

[0015] if the first determination result is yes, the air compressor is controlled to maintain the rotating speed for the rotating speed stabilization time at the actual motor rotating speed, and then the air compressor is controlled to decelerate at the stopping acceleration, and when the stopping time is reached, the motor rotating speed of the air compressor is 0, and the number of successful starts and stops is increased by 1;

[0016] determining whether the number of successful starts and stops is greater than the target test number, to obtain a second determination result, wherein if the second determination result is yes, the test is stopped, and if the second determination result is no, a current failure rate is calculated;

[0017] if the first determination result is no, the air compressor is controlled to stop, the number of test failures is increased by 1, and the current failure rate is calculated;

[0018] determining whether the current failure rate is greater than the failure rate threshold to obtain a third determination result, if the third determination result is yes, stopping the test, and if the third determination result is no, collecting the current motor temperature;

[0019] determining whether the current motor temperature is greater than the temperature threshold to obtain a fourth determination result, if the fourth determination result is yes, reducing the start-up acceleration of the current test as the start-up acceleration of the next test, and if the fourth determination result is no, taking the start-up acceleration of the current test as the start-up acceleration of the next test;

[0020] updating the number of experiments, and returning to the step of calculating the start-up time and the shutdown time of the air compressor according to the start-up acceleration of the current test.

[0021] Optionally, the start-up acceleration of the current test is reduced as the start-up acceleration of the next test, and specifically includes:

[0022] according to the formula reducing the start-up acceleration of the current test;

[0023] wherein, is the start-up acceleration of the next test, k is a proportional coefficient, 0 < k < 1, is the start-up acceleration of the current test.

[0024] Optionally, based on the test parameters, the air compressor is tested multiple times in a loop control manner, and before stopping the test when the end test condition is met, the fuel cell air compressor start-stop durability test method further includes:

[0025] according to calculating the start-up acceleration of the first test;

[0026] wherein, a1 is the start-up acceleration of the first test, ω is the speed of the motor, n p represents the number of motor pole pairs, J is the shaft coupling rotational inertia of the motor, T e is the output torque of the motor, T L is the load torque of the motor, and t represents time.

[0027] In a second aspect, the present application provides a fuel cell air compressor start-stop durability test device, which comprises a host computer, the host computer is connected with the motor controller of the air compressor, and the host computer is used to execute the fuel cell air compressor start-stop durability test method.

[0028] Optionally, the host computer is used to provide a human-computer interaction interface, and the human-computer interaction interface is used to set the test parameters of the air compressor.

[0029] Optionally, the host computer is connected to the motor controller of the air compressor through CAN communication.

[0030] Optionally, the air compressor start-stop durability test device for fuel cells further comprises a cooling mechanism for cooling the motor controller of the air compressor, and the cooling medium used by the cooling mechanism is pure water or ethylene glycol.

[0031] Optionally, the air compressor start-stop durability test device for fuel cells further comprises a camera for collecting a video of the air compressor during testing and transmitting the video to the host computer.

[0032] According to the specific embodiments provided in the present application, the following technical effects are disclosed:

[0033] The present application provides an air compressor start-stop durability test method and device for fuel cells, which adopts a cycle control mode to test the air compressor multiple times. During each test, the actual value of the motor speed after the air compressor is started is used to judge the test failure, so as to avoid the air bearing of the air compressor running at a low speed for a long time and affecting the working performance and reliability of the air bearing. The current failure rate is calculated after each test, and if the current failure rate is greater than the failure rate threshold, the test is stopped, which helps the experimenters to timely eliminate faults. The starting acceleration of the next test is adjusted according to the current motor temperature after each test, so as to avoid the motor shutdown or more serious accidents caused by overheating, reduce the test workload, and improve the test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0035] Figure 1 A flowchart of an air compressor start-stop durability test method for fuel cells provided by an embodiment of the present application is shown in the figure.

[0036] Figure 2 A detailed flowchart of an air compressor start-stop durability test method for fuel cells provided by an embodiment of the present application is shown in the figure.

[0037] Figure 3 A structural diagram of an air compressor start-stop durability test device for fuel cells provided by an embodiment of the present application is shown in the figure.

[0038] Reference signs:

[0039] 1-air inlet pipeline, 2-air compressor, 3-rotation speed sensor, 4-temperature sensor, 5-air outlet pipeline, 6-pneumatic ball valve, 7-camera, 8-cooling water inlet pipeline, 9-cooling water outlet pipeline, 10-motor controller, 11-upper computer, 12-cooling water valve, 13-cooling water tank. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0041] The above purposes, features and advantages of the present application will be more obvious and easy to understand. The present application will be described in further detail below with reference to the drawings and specific embodiments.

[0042] The present application provides a fuel cell air compressor start-stop durability test method, as shown in the formula (I), the fuel cell air compressor start-stop durability test method comprises: Figure 1

[0043] Step 101: obtaining the test parameters of the air compressor; the test parameters include the target rotation speed.

[0044] Step 102: based on the test parameters, the air compressor is tested multiple times in a cycle control manner until the test is stopped when the end test condition is met; if the error between the actual value of the motor rotation speed of the air compressor after starting and the target rotation speed exceeds the preset range during each test, the air compressor is stopped and the test is determined to fail, the current failure rate is calculated after each test and the current motor temperature of the air compressor is collected, the starting acceleration of the next test is adjusted according to the current motor temperature, and the end test condition includes that the number of successful starts reaches the target test number and the current failure rate is greater than the failure rate threshold.

[0045] The present application adopts a cycle control manner to test the air compressor multiple times, and the actual value of the motor rotation speed of the air compressor after starting is used to judge the test failure during each test, so as to avoid that the air bearing in the air compressor runs at low speed for a long time, avoid affecting the working performance and reliability of the air bearing, calculate the current failure rate after each test, stop the test if the current failure rate is greater than the failure rate threshold, which helps the experimenters to timely eliminate the faults, adjust the starting acceleration of the next test according to the current motor temperature after each test, avoid the motor stop or more serious accidents caused by over-temperature, reduce the test workload, and improve the test efficiency.

[0046] ​In one exemplary embodiment, the test parameters further include a shutdown acceleration, a rotation speed stabilization time, a temperature threshold, a failure rate threshold, and a target test number.

[0047] In one exemplary embodiment, the air compressor is a centrifugal air compressor for fuel cells.

[0048] In one exemplary embodiment, as shown in FIG. 1, step 102 specifically includes: Figure 2

[0049] According to the start-up acceleration of the current test, the start-up time and the shutdown time of the air compressor are calculated.

[0050] According to the start-up acceleration of the current test, the air compressor is started up, and the time is started to be counted.

[0051] When the start-up time is reached, the actual value of the motor rotation speed of the air compressor is collected.

[0052] It is determined whether the error between the actual value of the motor rotation speed and the target rotation speed is within a preset range, and a first determination result is obtained.

[0053] If the first determination result is yes, the air compressor is controlled to maintain the rotation speed at the actual value of the motor rotation speed for the rotation speed stabilization time, and then the air compressor is controlled to decelerate at the shutdown acceleration. When the shutdown time is reached, the motor rotation speed of the air compressor is 0, and the number of successful start-ups is increased by 1.

[0054] It is determined whether the number of successful start-ups is greater than the target test number, and a second determination result is obtained. If the second determination result is yes, the test is stopped. If the second determination result is no, the current failure rate is calculated.

[0055] If the first determination result is no, the air compressor is controlled to be shut down, the number of test failures is increased by 1, and the current failure rate is calculated.

[0056] It is determined whether the current failure rate is greater than the failure rate threshold, and a third determination result is obtained. If the third determination result is yes, the test is stopped. If the third determination result is no, the current motor temperature is collected.

[0057] It is determined whether the current motor temperature is greater than the temperature threshold, and a fourth determination result is obtained. If the fourth determination result is yes, the start-up acceleration of the current test is reduced as the start-up acceleration of the next test. If the fourth determination result is no, the start-up acceleration of the current test is taken as the start-up acceleration of the next test.

[0058] The test number is updated, and the step of calculating the start-up time and the shutdown time of the air compressor according to the start-up acceleration of the current test is returned to.

[0059] ​In one exemplary embodiment, the starting acceleration of the current test is reduced as the starting acceleration of the next test, specifically comprising: according to the formula The starting acceleration of the current test is reduced.

[0060] wherein, is the starting acceleration of the next test, k is a proportional coefficient, 0 < k < 1, is the starting acceleration of the current test.

[0061] Based on the test parameters, the air compressor is tested multiple times in a loop control manner, and before stopping the test when the end test condition is met, the fuel cell air compressor start-stop durability test method further comprises: according to The starting acceleration of the first test is calculated.

[0062] wherein, a1 is the starting acceleration of the first test, ω is the speed of the motor, n p represents the number of motor pole pairs, J is the shaft coupling rotational inertia of the motor, T e is the output torque of the motor, T L is the load torque of the motor, and t represents time.

[0063] The present application realizes automatic testing of the fuel cell vehicle centrifugal air compressor start-stop durability, which only needs to set the corresponding parameters before the experiment starts to realize automatic testing, greatly improving the testing efficiency.

[0064] The present application adds an air compressor start failure automatic judgment module to avoid the air bearing of the air compressor running at low speed for a long time, and to avoid affecting the working performance and reliability of the air bearing.

[0065] The present application adds a temperature protection module, which reduces the motor starting acceleration when the motor temperature exceeds the set temperature threshold, thereby reducing the motor stator current and achieving the purpose of reducing the motor heat generation, avoiding the motor shutdown or more serious accidents caused by over-temperature, saving the process of manual temperature judgment and manual shutdown and restart, reducing the workload of the test personnel, shortening the total test time, and thereby improving the test efficiency.

[0066] Based on the same inventive concept, the embodiments of the present application also provide a fuel cell air compressor start-stop durability test device for realizing the fuel cell air compressor start-stop durability test method described above. The problem-solving implementation scheme provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more fuel cell air compressor start-stop durability test device embodiments provided below can be referred to the limitations of the fuel cell air compressor start-stop durability test method in the above text, which will not be repeated here.

[0067] In one exemplary embodiment, the application provides a fuel cell air compressor start-stop durability test device, which comprises a host computer connected with a motor controller of the air compressor, and the host computer is used to execute the fuel cell air compressor start-stop durability test method.

[0068] The host computer is used to provide a human-computer interaction interface for setting test parameters of the air compressor.

[0069] The host computer is connected with the motor controller of the air compressor through CAN communication.

[0070] The fuel cell air compressor start-stop durability test device further comprises a camera for collecting a video of the air compressor during the test and transmitting the video to the host computer.

[0071] The camera is wirelessly connected with the host computer through Wifi.

[0072] In one exemplary embodiment, as shown in Figure 3 The fuel cell air compressor start-stop durability test device further comprises an air compressor test mechanism, an electric drive mechanism, a cooling mechanism and a control system.

[0073] The air compressor test mechanism comprises an air compressor 2, an air inlet pipeline 1, an air outlet pipeline 5 and an adjusting valve, and the adjusting valve is specifically a pneumatic ball valve 6; the air inlet pipeline 1 is connected with an inlet of the air compressor 2, and the air outlet pipeline 5 is connected with an outlet of the air compressor 2.

[0074] The electric drive mechanism, the centrifugal air compressor is directly driven by a motor, and the electric drive mechanism comprises a motor and a motor control system electrically connected with the motor, and the motor is drivingly connected with the first-stage air compressor and the second-stage air compressor.

[0075] The cooling system is composed of a cooling water tank 13, a fan, a water pump and various valves, and its function is to cool components prone to high temperature during operation of the air compressor driving motor and the motor controller 10, etc., to enhance the stability and sustainability of high-speed operation of the air compressor 2, and the cooling medium is generally pure water or ethylene glycol; the cooling medium in the cooling water tank 13 is transmitted to the air compressor 2 through a cooling water inlet pipeline 8, and the cooling medium passing through the air compressor 2 is returned to the cooling water tank through a cooling water outlet pipeline 9, and a cooling water valve 12 is arranged on the cooling water outlet pipeline 9.

[0076] The control system is composed of software and hardware. The hardware is composed of a personal computer (PC) and a lower computer, and the lower computer includes a motor controller 10 and a programmable logic controller (PLC). The software is composed of the upper computer 11 and a communication system. The main function of the upper computer 11 is to provide a man-machine interface to control the start, stop and running of the test and control platform, and to monitor and collect various parameters measured by sensors, such as motor speed, motor temperature, bus current and other motor parameters. The upper computer 11 is programmed by LabView. The lower computer is a component that actually controls the action of the actuator. The motor controller 10 is responsible for controlling and collecting the running state of the motor, such as starting and stopping and speed control. The PLC is mainly responsible for controlling the opening of each valve and the operation of each auxiliary pump. The communication system includes CAN communication between the upper computer 11 and the motor controller 10, and Modbus TCP communication between the upper computer 11 and the PLC.

[0077] A camera 7 is used to monitor the test device. The camera 7 is wirelessly connected to the upper computer 11 through Wifi.

[0078] In an exemplary embodiment, after the fuel cell air compressor start-stop durability test device is built, the test method includes:

[0079] Step S1: Turn on the high-voltage power supply and the low-voltage power supply of the test bench, turn on the upper computer, realize data communication between the upper computer and the test bench through CAN communication and Modbus TCP communication, and execute step S2.

[0080] Step S2: Set the shutdown acceleration a2, the target speed w0 of the lowest steady state, the speed stabilization time T2, the temperature threshold K0, the failure rate threshold H0, the number of successful starts N1 = 0, the number of test failures N2 = 0, and the target test number N. The shutdown acceleration is the maximum load shedding acceleration. The target speed is the lowest steady state of the air compressor, i.e. the idle speed. The temperature threshold is generally 0.9 times the maximum operating temperature of the motor. The failure rate threshold is determined by the motor control algorithm. The target test number is generally 150,000 according to the requirements of the European standard. Execute step S3.

[0081] Step S3: According to the formula The instantaneous acceleration of the motor can be calculated, where w is the speed of the motor, n p represents the number of motor pole pairs, J is the shaft coupling rotational inertia of the motor, T e is the output torque of the motor, and T L is the load torque of the motor. For easy control, uniform acceleration start is selected, and the output torque is constant. At this time, the acceleration of the motor during start-up is Execute step S4.

[0082] Step S4: Calculate the start time according to the start acceleration a1 and the stop acceleration a2 and the stop time Step S5 is performed.

[0083] Step S5: The motor is started, the time t is started, and step S6 is performed.

[0084] Step S6: When t = T1, the actual value of the motor speed sensor in the host computer is ω1 at this time, and the motor reaches a stable state of speed due to the influence of the control algorithm, and there is a certain speed fluctuation. Therefore, the calculation is That is, the error with the target speed within m% can be regarded as reaching the target speed, and the error with the target speed greater than m% is not reaching the target speed. If the target speed is reached, step S7 is performed, and if the target speed is not reached, step S8 is performed.

[0085] Step S7: After reaching the target speed, the speed ω0 is maintained for T2 time, and step S9 is performed.

[0086] Step S8: The reason why the target speed is not reached is that the motor fails to start due to the insufficient stability of the control algorithm. At this time, the air compressor runs at a low speed, and when running at a low speed, the air film of the air bearing may not be sufficient or stable, which will cause the contact between the working surfaces of the bearing to increase, thereby causing the wear to increase. Therefore, when the start fails, the stop program is immediately executed, and the failure number N2 = N2 + 1 is accumulated, and step S12 is performed.

[0087] Step S9: When t = T1 + T2, the motor starts the stop program, and the motor decelerates with acceleration a2, and step S10 is performed.

[0088] Step S10: When t = T1 + T2 + T3, the motor speed is reduced to 0, and the motor is completely stopped, the start-stop success number N1 = N1 + 1 is accumulated, and step S11 is performed.

[0089] Step S11: Determine whether N1 > N, if yes, the total number of start-stop durability cycle tests is reached, and the program ends; if not, the total number of start-stop durability cycle tests is not reached, and step S12 is performed.

[0090] Step S12: Calculate the real-time failure rate That is, the failure rate after the current test.

[0091] Step S13: judging H1>H0, if yes, the failure rate is too high, which may be caused by the internal structure of the air compressor, especially the air bearing, and the air compressor must be stopped immediately for checking by the experimenters; if no, step S14 is executed.

[0092] Step S14: resetting the time t=0, and executing step S15.

[0093] Step S15: obtaining the actual value of the motor temperature sensor K1 in the host computer, and judging K1>K0, if yes, step S16 is executed, because the motor temperature is too high at this time, which will cause the reduction of the motor efficiency and the mechanical performance, and even bring danger, and the motor starting acceleration is adjusted according to the motor torque formula, and the formula is as follows:

[0094] wherein, ω is the rotating speed of the motor, J is the rotating inertia of the motor shaft, n p represents the number of motor pole pairs, ψ n is the rotor permanent magnet flux linkage; i is the stator current vector, θ is the angle between the stator current vector and the rotor flux linkage vector, T L is the load torque of the motor. According to the formula, when the starting acceleration is reduced, the stator current vector will also be reduced, according to the Joule-Lenz law: Q=I 2 Rt, in the case of constant time and constant resistance, the smaller the current is, the smaller the heat is. Therefore, the heat can be reduced by reducing the starting acceleration, and when the heat of the motor is smaller than the heat dissipation of the heat dissipation system, the temperature of the motor can be reduced; otherwise, step S3 is executed.

[0095] Step S16: setting the starting acceleration k is a proportional coefficient, and k is generally set to 0.8 according to experience, and step S4 is executed.

[0096] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that the combinations are within the scope of the present application.

[0097] The principles and implementation modes of the present application are described by using specific examples in this paper, and the above embodiment is only used to help understand the method and its core idea of the present application; at the same time, according to the idea of the present application, the specific implementation mode and application range will be changed by the general technical personnel in the art. In conclusion, the content of the present application should not be understood as a limitation.

Claims

1. A method of testing durability of start-stop of an air compressor for a fuel cell, characterized by, The fuel cell air compressor start-stop durability test method comprises: obtaining test parameters of the air compressor; the test parameters comprise a target rotating speed; based on the test parameters, the air compressor is tested multiple times in a cycle control mode until the test is stopped when the end test condition is met; if the error between the actual motor rotating speed of the air compressor after starting and the target rotating speed exceeds the preset range during each test, the air compressor is controlled to stop and the test is determined to fail, the current failure rate is calculated after each test and the current motor temperature of the air compressor is collected, and the starting acceleration of the next test is adjusted according to the current motor temperature; the end test condition comprises that the number of successful starts and stops reaches the target test number and the current failure rate is greater than the failure rate threshold; the test parameters further comprise a stop acceleration, a rotating speed stabilization time, a temperature threshold, a failure rate threshold and a target test number; based on the test parameters, the air compressor is tested multiple times in a cycle control mode until the test is stopped when the end test condition is met, specifically comprising: calculating the starting time and the stopping time of the air compressor according to the starting acceleration of the current test; starting the air compressor according to the starting acceleration of the current test and starting the timer; when the starting time is reached, the actual motor rotating speed of the air compressor is collected; judging whether the error between the actual motor rotating speed and the target rotating speed is within the preset range to obtain a first judgment result; if the first judgment result is yes, the air compressor is controlled to maintain the rotating speed for the rotating speed stabilization time at the actual motor rotating speed, and then the air compressor is controlled to decelerate at the stop acceleration; when the stopping time is reached, the motor rotating speed of the air compressor is 0, and the number of successful starts and stops is increased by 1; judging whether the number of successful starts and stops is greater than the target test number to obtain a second judgment result; if the second judgment result is yes, the test is stopped; if the second judgment result is no, the current failure rate is calculated; if the first judgment result is no, the air compressor is controlled to stop, the number of test failures is increased by 1, and the current failure rate is calculated; judging whether the current failure rate is greater than the failure rate threshold to obtain a third judgment result; if the third judgment result is yes, the test is stopped; if the third judgment result is no, the current motor temperature is collected; judging whether the current motor temperature is greater than the temperature threshold to obtain a fourth judgment result; if the fourth judgment result is yes, the starting acceleration of the current test is reduced as the starting acceleration of the next test; if the fourth judgment result is no, the starting acceleration of the current test is taken as the starting acceleration of the next test; updating the test number and returning to the step of calculating the starting time and the stopping time of the air compressor according to the starting acceleration of the current test.

2. The air compressor start-stop durability test method for fuel cells according to claim 1, characterized by, reducing the starting acceleration of the current test as the starting acceleration of the next test, specifically comprising: According to the formula Lower the start acceleration of the current test; wherein, is the acceleration at start of the next test, is a proportionality factor, , is the acceleration at start of the current test.

3. The air compressor start-stop durability test method for fuel cells according to claim 1, characterized by, before the fuel cell air compressor start-stop durability test method stops the test based on the test parameters and in a cycle control mode, the fuel cell air compressor start-stop durability test method further comprises: According to The starting acceleration of the first test is calculated; wherein, is the start acceleration for the first test, is the rotational speed of the electric machine, denotes the number of pole pairs of the electric machine, J is the shaft coupling rotational inertia of the electric machine, is the output torque of the electric machine, is the load torque of the electric machine, t denotes the time.

4. An air compressor start-stop durability test device for a fuel cell, characterized by comprising: The fuel cell air compressor start-stop durability test device comprises an upper computer connected with a motor controller of the air compressor, and the upper computer is used for executing the fuel cell air compressor start-stop durability test method according to any one of claims 1-3.

5. The air compressor start-stop durability test device for fuel cells according to claim 4, characterized by The upper computer is used for providing a human-computer interaction interface for setting test parameters of the air compressor.

6. The air compressor start-stop durability test device for fuel cells according to claim 4, characterized by The upper computer is connected with the motor controller of the air compressor through CAN communication.

7. The air compressor start-stop durability test device for fuel cells according to claim 4, characterized by The fuel cell air compressor start-stop durability test device further comprises a cooling mechanism for cooling the motor controller of the air compressor, and the cooling mechanism uses pure water or ethylene glycol as a cooling medium.

8. The air compressor start-stop durability test device for fuel cells according to claim 4, characterized by The fuel cell air compressor start-stop durability test device further comprises a camera for collecting a video of the air compressor during the test and transmitting the video to the upper computer.

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