A commercial vehicle AMT off-line test method

Abstract

The application discloses a kind of commercial vehicle AMT off-line test method, comprising the following process, AMT gearbox is clamped on test bench, and power supply and gas supply are provided for AMT transmission, and whole vehicle CAN network communication environment is simulated;AMT gearbox is tested in turn clutch actuator solenoid valve, self-learning, brake test, NVH test and whole vehicle parameter file reset, and according to the feedback information of TCU, determine AMT gearbox qualified or repair. The execution link of test process is controlled by TCU, whether other test items except NVH test is qualified is determined by TCU;Test method realizes the automatic test of AMT production;Test pace is controllable, can satisfy huge production manufacturing demand;Test item can be configured, can realize individualized test demand;The test method of the application is suitable for different types of AMT gearbox;Test method and test item cover all functions to be tested of AMT.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of automobile transmission, and particularly relates to a commercial vehicle AMT (Automated Manual Transmission) off-line testing method. BACKGROUND

[0002] AMT (Automated Manual Transmission) is a kind of transmission device capable of realizing automatic gear shifting according to vehicle running state and vehicle driving road environment. Most commercial vehicles in the prior art have been equipped with AMT automatic transmission, and the AMT automatic transmission has been gradually popularized in the market, and the AMT market share is rapidly increasing in a gradually increasing trend. In order to ensure the product quality of the AMT, in addition to the development and calibration testing, the production process is also a key link to ensure the product quality of the AMT, and the off-line testing is a key step in the whole production process.

[0003] However, there is no standard AMT off-line testing method in the prior art, and the automatic testing cannot be realized, the production rhythm cannot be met, and the problem of low testing efficiency exists. SUMMARY

[0004] In order to solve the problems in the prior art, the application provides a commercial vehicle AMT off-line testing method, which can complete all detection items of the AMT product before leaving the factory under the premise of meeting the production rhythm, and realize automatic testing.

[0005] In order to achieve the above purpose, the application provides the following technical scheme:

[0006] A commercial vehicle AMT off-line testing method comprises the following processes,

[0007] The AMT transmission is clamped on the bench, and power supply and gas supply are provided for the AMT transmission, and the whole vehicle CAN network communication environment is simulated;

[0008] The AMT transmission is sequentially subjected to clutch actuator electromagnetic valve testing, self-learning, brake testing, NVH testing and whole vehicle parameter file resetting, and the feedback information of the TCU is used to determine whether the AMT transmission is qualified or needs to be repaired.

[0009] Preferably, the method comprises the following steps,

[0010] Step 1, waiting for the bench to clamp the transmission; and determining whether clamping is completed, if not, alarming; if clamping is completed, executing step 2;

[0011] Step 2, the bench scans the two-dimensional code on the AMT gearbox, selects the corresponding configuration file on the server according to the information read by scanning the code, provides the TCU with a direct current power supply, a gas source, and a configuration CAN network environment according to the configuration file, and reads fault codes; if there is a hardware fault in the AMT gearbox, it is repaired, and if there is no hardware fault, step 3 is performed;

[0012] Step 3, the software version number information stored in the TCU is read and checked with the information read by scanning the two-dimensional code; if the software version number information is incorrect, the software is repaired and rewritten, and if the software version number information is correct, step 4 is performed;

[0013] Step 4, the clutch actuator solenoid valve test is performed; if the clutch actuator solenoid valve test is unqualified, it is repaired, and if the clutch actuator solenoid valve test is qualified, step 5 is performed;

[0014] Step 5, the gearbox self-learning is performed; if it is successful, step 6 is performed, and if it fails, the gearbox self-learning is repeatedly activated; if it is successful after repeated testing, step 6 is performed, and if it still fails after repeated testing, it is repaired;

[0015] Step 6, TB testing is performed; if it is successful, step 7 is performed, and if it fails, TB testing is repeatedly activated; if it is successful after repeated testing, step 7 is performed, and if it still fails after repeated testing, it is repaired;

[0016] Step 7, NVH testing is performed; if it is successful, step 8 is performed, and if it fails, it is repaired;

[0017] Step 8, reset the vehicle parameters and clear the fault codes.

[0018] Preferably, the bench and the AMT gearbox TCU use UDS protocol for data interaction.

[0019] Preferably, the clutch actuator solenoid valve test specifically includes the following steps,

[0020] Step 41, after receiving the clutch actuator solenoid valve test command sent by the bench, the TCU opens the clutch intake quick valve and then closes it; the TCU determines whether the intake quick valve function is normal according to the change amount of the clutch actuator displacement sensor signal; if it is abnormal, the test is stopped, the exhaust valve is opened and then closed, and it is repaired; if it is normal, step 42 is performed;

[0021] Step 42, open the exhaust slow valve and then close it; the TCU determines whether the exhaust slow valve function is normal according to the change amount of the clutch actuator displacement sensor signal; if it is abnormal, the test is stopped, the exhaust valve is opened and then closed, and it is repaired; if it is normal, step 43 is performed;

[0022] Step 43, open the clutch intake slow valve and close it, the TCU determines whether the intake slow valve function is normal according to the change of the clutch actuator displacement sensor signal, if abnormal, stop testing, open the exhaust valve and close it, and return to repair, if normal, execute step 44;

[0023] Step 44, open the exhaust fast valve and close it, the TCU determines whether the exhaust fast valve function is normal according to the change of the clutch actuator displacement sensor signal, if abnormal, stop testing, open the exhaust valve and close it, and return to repair, if normal, execute step 45;

[0024] Step 45, open the two intake valves and close them, the TCU detects whether the displacement sensor changes more than 2mm within 5min, if more than 2mm, open the exhaust valve and close it, feedback to the test bench that the test fails and return to repair, if not more than 2mm, open the exhaust valve and close it, feedback to the test bench that the test is successful.

[0025] Preferably, the TB test specifically includes the following process, the test bench sends a TB test command to the TCU and keeps the front motor at 1500 RPM, after the TCU receives the TB test command, opens the clutch when the input shaft speed is at 1500±100 RPM, opens the brake solenoid valve and closes it after the clutch is opened, closes the clutch after 0.5s, the TCU calculates the response time, brake rate and exit brake time of the TB according to the change of the input shaft speed, if all indicators meet the design requirements, feedback to the test bench that the test is successful, if the design requirements are not met, repeat the test, if the design requirements are still not met after repeated testing, feedback to the test bench that the test fails and return to repair, if all indicators meet the design requirements after repeated testing, feedback to the test bench that the test is successful.

[0026] Preferably, the NVH test specifically includes the following process, the NVH test equipment is tightly attached to the transmission housing; after the test bench sends an NVH test command to the TCU, the front motor of the test bench is at 80 RPM, the TCU performs a gear engagement action, the test bench receives feedback from the TCU, when the TCU completes the gear engagement, the front motor of the test bench increases the speed to 1500 RPM at a rate of 300 RPM, and the rear motor provides a load matching the gear position at the same time; the front motor runs at a constant speed for 5 seconds, and then decreases the speed to 80 RPM at a rate of 300 RPM, the rear motor provides a load matching the gear position during the speed reduction process; the TCU engages the next gear, and repeats the above steps until the TCU feedbacks to the test bench that all tests have been completed; during the entire test process, the NVH equipment detects the vibration state of the transmission and determines whether it is qualified, if not, stop testing immediately and return to repair.

[0027] Preferably, the AMT gearbox is clamped on the bench, which comprises the following processes: the AMT gearbox is automatically hoisted to the bench, the input shaft of the AMT gearbox is centered and inserted into the clutch inner spline, the clutch housing and the bench flywheel housing are clamped by the hydraulic clamping jaw, and the output shaft of the bench is connected and fastened with the gearbox flange plate.

[0028] Preferably, a test report is generated after the test is completed, the test report records the offline time, the gearbox order number, the software version number and the gearbox self-learning result, and is uploaded to the server for online storage.

[0029] Compared with the prior art, the present application has the following beneficial technical effects:

[0030] The present application provides a method for testing AMT of commercial vehicle offline, which provides power supply and gas supply for AMT gearbox, and simulates CAN network communication environment of whole vehicle; and the AMT gearbox is tested in turn for clutch actuator solenoid valve, self-learning, brake testing, NVH testing and whole vehicle parameter file resetting, and the AMT gearbox is determined to be qualified or repaired according to the feedback information of TCU. The execution links of the test process are controlled by TCU, and whether other test items except NVH testing are qualified is determined by TCU; the test method realizes automatic test of AMT production; the test rhythm is controllable, which can meet the huge production and manufacturing demand; the test items are configurable, which can realize personalized test demand; the test method of the present application is suitable for different types of AMT gearbox; the test method and test items cover all functions to be tested of AMT; and the test result is traceable. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structure diagram of AMT offline bench.

[0032] Figure 2 It is a schematic view of AMT gearbox and tray.

[0033] Figure 3 It is a schematic view of AMT gearbox clamping device.

[0034] Figure 4 It is a schematic view of AMT offline test process.

[0035] Figure 5 It is a schematic view of AMT clutch actuator solenoid valve test process. DETAILED DESCRIPTION

[0036] The present application will be further described in detail below in combination with specific embodiments, which are an explanation but not a limitation of the present application.

[0037] The application discloses a method for AMT off-line test of commercial vehicles, and specifically comprises the following process: the AMT gearbox which is completed with assembly and fixed on a tray is transported to an AMT off-line bench station through a production line guide rail, the off-line bench is used for clamping the AMT gearbox on the bench according to actual conditions, power supply and gas supply are provided for the AMT gearbox, the CAN network communication environment of the whole vehicle is simulated, UDS protocol is adopted to realize basic communication with the TCU of the AMT gearbox, and basic test items such as clutch actuator solenoid valve test, self-learning, brake test and NVH test of the AMT gearbox are completed according to a certain test procedure.

[0038] Wherein:

[0039] The AMT gearbox which is completed with assembly refers to that all mechanical parts and electric control parts are assembled according to process operation instruction book according to design drawings, the gearbox is fixed on a process tray stably, the power plug and the gas pipe joint are plugged into the corresponding interfaces on the tray, and the software writing work of the TCU is completed in the software writing station, so that the AMT gearbox theoretically has all design functions of the AMT.

[0040] The off-line bench is used for clamping the AMT gearbox on the bench according to actual conditions, that is, the bench is used for automatically hoisting the gearbox on the bench according to preparation conditions, the input shaft of the gearbox is centered and inserted into the clutch inner spline, the clutch shell and the bench flywheel shell are clamped by the hydraulic clamping jaw, and the output shaft of the bench is connected and fastened with the flange plate of the gearbox.

[0041] The power supply and the gas supply provided for the AMT gearbox refer to that the bench is used for automatically connecting the power plug and the gas joint with the corresponding interfaces on the process tray, and direct-current power supply with the same voltage as the normal working voltage of the TCU and dry compressed air with a pressure of 8±0.5 Bar are provided. The CAN network communication environment of the whole vehicle is simulated, that is, the bench is used for automatically selecting communication baud rate according to a protocol file, and related messages required for off-line detection are simulated and sent according to J1939 or 11898 communication protocols, such as motor speed signals.

[0042] The basic communication realized by the bench and the AMT gearbox by adopting the UDS protocol refers to the interaction between the bench and the TCU, and the commands sent by the bench to the TCU and the feedback information of the TCU to the bench are sent through the UDS protocol.

[0043] The certain test procedure refers to the order of the test method proposed in the patent, the judgment standard of the test result, and the processing scheme of the bench when error occurs or the test result is abnormal. All items in the test procedure of the bench can be configured.

[0044] The basic test items refer to various works for verifying whether each function of the AMT gearbox is normal and for meeting assembly requirements of different vehicle models, mainly including clutch actuator solenoid valve test, gearbox self-learning, brake test, NVH test, gear ratio verification, parameter reset and calibration, and report generation.

[0045] The method for AMT off-line test of the commercial vehicle provided by the application has the following advantages: the test process is fully automated; the test rhythm is controllable, and can meet the huge production and manufacturing requirements; the test items are configurable, and can realize personalized test requirements; the test method is suitable for different types of AMT gearboxes; the test method and test items cover all functions to be tested of the AMT; and the test results are traceable.

[0046] Embodiment

[0047] The method for AMT off-line test of the commercial vehicle provided by the application has the following advantages: the test process is fully automated; the test rhythm is controllable, and can meet the huge production and manufacturing requirements; the test items are configurable, and can realize personalized test requirements; the test method is suitable for different types of AMT gearboxes; the test method and test items cover all functions to be tested of the AMT; and the test results are traceable.

[0048] Figure 1 is a structural principle diagram of the AMT off-line test bench. The gearbox is connected with the front and rear motors of the test bench through the dry clutch and the flange plate, and the test bench communicates with the TCU through the UDS protocol. The front and rear motors provide a basic test environment for the off-line test of the gearbox, and provide the rotating speed or load for the gearbox during the off-line test.

[0049] The off-line process of the embodiment mainly includes the following three steps:

[0050] First, the gearbox is clamped.

[0051] The assembled gearbox is fixed on the tray, as shown in Figure 2 The tray has different support points, and can be adapted to different models of the gearbox. The process harness on the tray is connected with the TCU, wherein the process harness refers to a specially designed harness for meeting a large number of plugging and unplugging times. The air pipe on the tray is connected with the air source interface of the gearbox.

[0052] After the bench is ready, the line-mounted tray with the gearbox is transferred to a fixed position, the tray lifts the gearbox to the same height as the clutch inner spline, the front-end motor provides a speed of 10 RPM, the tray inserts the gearbox shaft into the clutch inner spline, and the bench headstock assembly clamps the gearbox clutch housing. After the gearbox clutch housing is clamped, the front-end motor stops rotating and remains free. Then the bench rear-end output shaft quickly approaches the gearbox flange at a speed of 0.05 m / s. After leaving the flange by 5 cm, it approaches the flange at a speed of 0.01 m / s, while the rear-end motor provides a speed of 10 RPM to ensure that the output shaft and the flange spline are matched. Figure 3 The clamping device of the bench headstock shown in

[0053] After the above clamping steps are completed, the bench connects the harness to the tray harness, connects the air source to the tray air source interface, scans the code to read the gearbox information, and provides appropriate DC power and air source for the gearbox according to the corresponding protocol file.

[0054] Second, complete the test according to the specified process.

[0055] After the gearbox is clamped, all offline test items are completed according to the offline process shown in Figure 4

[0056] (1) Wait for the gearbox to be clamped. If it is not clamped, the bench will alarm and process it. If it is clamped, go to the next step.

[0057] (2) The bench scans the two-dimensional code on the gearbox, selects the corresponding configuration file on the server according to the information read by the code scanning, and the configuration file lists the working voltage and CAN bus information baud rate corresponding to the gearbox. According to the configuration file, provide appropriate DC power for the TCU, configure the CAN network environment, provide appropriate pressure dry compressed air source for the gearbox, and read the fault code. If there is a hardware fault, it will be immediately repaired. If there is no hardware fault, go to the next step.

[0058] (3) Read the software version number and other information stored in the TCU, and check with the information read by scanning the two-dimensional code. If the software version number and other information are incorrect, repair and rewrite the software. If the software version number and other information are correct, go to the next step.

[0059] (4) Test the clutch actuator solenoid. The specific test process is shown in Figure 5 If the test fails, repair it. If the test is successful, go to the next step.

[0060] ​(5)Gearbox self-learning, if successful, then go to the next step, if failed, then repeat the activation of gearbox self-learning, if successful after repeated testing, then go to the next step, if still failed after repeated testing, then repair.

[0061] (6)TB (Transmission Brake) test, if successful, then go to the next step, if failed, then repeat the activation of TB test, if successful after repeated testing, then go to the next step, if still failed after repeated testing, then repair.

[0062] (7) NVH test, if successful, then go to the next step, if failed, then repair.

[0063] (8) Reset the vehicle parameters and clear fault codes.

[0064] The clutch actuator is composed of two sets of intake valves and two sets of exhaust valves, as well as displacement sensors and cylinders. The test of the clutch actuator mainly tests whether the function of the electromagnetic valve is normal and whether there is a leakage.

[0065] As shown in Figure 5 , it is the specific process of the clutch actuator electromagnetic valve test.

[0066] (1) After the TCU receives the command of the clutch actuator electromagnetic valve test sent by the test bench, the clutch intake fast valve is opened for 0.2s and then closed. The TCU determines whether the function of the intake fast valve is normal according to the change of the displacement sensor signal of the clutch actuator. If it is abnormal, the test is stopped, the exhaust valve is opened for 0.3s and then closed, and the repair is returned. If it is normal, then go to the next step.

[0067] (2) The exhaust slow valve is opened for 0.1s and then closed. The TCU determines whether the function of the exhaust slow valve is normal according to the change of the displacement sensor signal of the clutch actuator. If it is abnormal, the test is stopped, the exhaust valve is opened for 0.3s and then closed, and the repair is returned. If it is normal, then go to the next step.

[0068] (3) The clutch intake slow valve is opened for 0.1s and then closed. The TCU determines whether the function of the intake slow valve is normal according to the change of the displacement sensor signal of the clutch actuator. If it is abnormal, the test is stopped, the exhaust valve is opened for 0.3s and then closed, and the repair is returned. If it is normal, then go to the next step.

[0069] (4) The exhaust fast valve is opened for 0.3s and then closed. The TCU determines whether the function of the exhaust fast valve is normal according to the change of the displacement sensor signal of the clutch actuator. If it is abnormal, the test is stopped, the exhaust valve is opened for 0.3s and then closed, and the repair is returned. If it is normal, then go to the next step.

[0070] (5) After opening the two intake valves for 0.2s, close them, and within 5 minutes, check whether the displacement sensor changes by more than 2mm. If it does, open the exhaust valve for 0.3s and then close it, feed back to the test bench that the test has failed and return it for repair. If it does not change by more than 2mm, open the exhaust valve for 0.3s and then close it, feed back to the test bench that the test has succeeded.

[0071] The specific process of the TB test is that the test bench sends a TB test command to the TCU and keeps the front-end motor at 1500 RPM. After receiving the TB test command, the TCU opens the clutch when the input shaft speed is 1500 ± 100 RPM, opens the brake solenoid valve for 0.2s and then closes it after 0.2s, and closes the clutch after 0.5s. The TCU calculates the response time, brake rate and brake exit time of the TB according to the change of the input shaft speed. If all indicators meet the design requirements, feed back to the test bench that the test has succeeded. If the design requirements are not met, repeat the test. If the design requirements are still not met after repeated testing, feed back to the test bench that the test has failed and return it for repair. If all indicators meet the design requirements after repeated testing, feed back to the test bench that the test has succeeded.

[0072] The NVH test mainly checks whether the gearbox gears have burrs or abnormal noise due to improper assembly. After clamping the gearbox, the test bench automatically attaches the NVH test equipment to the gearbox housing. After the test bench sends an NVH test command to the TCU, the front-end motor of the test bench is 80 RPM, the TCU executes the gear engagement action, and the test bench receives the feedback of the TCU. When the TCU completes the gear engagement, the front-end motor of the test bench increases the speed to 1500 RPM at a rate of 300 RPM, and the rear-end motor provides a load matching the gear position. After the front-end motor runs at a constant speed for 5 seconds, it decreases the speed to 80 RPM at a rate of 300 RPM, and the rear-end motor provides a load matching the gear position during the speed reduction process. The TCU engages the next gear, and repeats the above steps until the TCU feeds back to the test bench that all tests have been completed. During the entire test process, the NVH equipment detects the vibration state of the gearbox and determines whether it is qualified. If it is not qualified, the test is immediately stopped and returned for repair. During the NVH test, the gears that need to be detected, i.e. the gears that need to be engaged, can be flexibly configured by the TCU.

[0073] The above test steps and test items are sent by the test bench to the TCU through the UDS protocol, and whether each item is qualified is determined according to the reply received from the TCU. Each test step can not only be automatically processed according to the process, but also can be configured with the items to be tested in the automatic test process, and can be manually activated or repeatedly activated.

[0074] Thirdly, a test report is generated.

[0075] After completing the test, the test report is automatically generated, important information such as offline time, gearbox order number, software version number, gearbox self-learning result and the like are recorded, and the server is uploaded. The after-sales market can find the corresponding gearbox offline test report according to the gearbox order number.

[0076] The application discloses an AMT offline test method, clearly defines the clamping process of the gearbox on the test bench, details the test items and test process of the AMT offline test, provides strong support for the establishment of the automatic production line, guarantees the huge production and manufacturing demand, and comprehensively reduces the zero kilometer fault of the AMT product.

Claims

1. A method for testing the off-line operation of an automated manual transmission (AMT) system in commercial vehicles, characterized in that... Includes the following processes, The AMT transmission was mounted on the test bench, and power and air were supplied to the AMT transmission, simulating the vehicle's CAN network communication environment. The AMT transmission is subjected to sequential tests including clutch actuator solenoid valve testing, self-learning, brake testing, NVH testing, and vehicle parameter file reset. The AMT transmission is then judged as qualified or required to be repaired based on the feedback information from the TCU. The test of the solenoid valve of the clutch actuator specifically includes the following steps. Step 41: After receiving the command from the test bench to test the clutch actuator solenoid valve, the TCU opens the clutch intake quick valve and then closes it. The TCU determines whether the intake quick valve is functioning normally based on the change in the clutch actuator displacement sensor signal. If it is abnormal, the test is stopped, the exhaust valve is opened and then closed, and the device is returned for repair. If it is normal, step 42 is executed. Step 42: Open the exhaust slow valve and then close it. The TCU determines whether the exhaust slow valve is functioning normally based on the change in the signal from the clutch actuator displacement sensor. If it is abnormal, stop the test, open the exhaust valve and then close it, and return it for repair. If it is normal, proceed to step 43. Step 43: Open the clutch intake slow valve and then close it. The TCU determines whether the intake slow valve is functioning normally based on the change in the signal from the clutch actuator displacement sensor. If it is abnormal, stop the test, open the exhaust valve and then close it, and return it for repair. If it is normal, proceed to step 44. Step 44: Open the exhaust quick valve and then close it. The TCU determines whether the exhaust quick valve is functioning normally based on the change in the signal from the clutch actuator displacement sensor. If it is abnormal, stop the test, open the exhaust valve and then close it, and return it for repair. If it is normal, proceed to step 45. Step 45: Open both intake valves and then close them. Within 5 minutes, the TCU detects whether the change in displacement sensor exceeds 2mm. If it does, open the exhaust valve and then close it, report the test failure to the test bench and send it back for repair. If it does not exceed 2mm, open the exhaust valve and then close it, report the test success to the test bench. The brake test specifically includes the following process: the test bench sends a brake test command to the TCU and keeps the front motor at 1500 RPM. After receiving the brake test command, the TCU opens the clutch when the input shaft speed reaches 1500±100 RPM. After the clutch opens, the brake solenoid valve is opened and then closed. The clutch is closed 0.5 seconds later. The TCU calculates the brake response time, braking rate, and brake release time based on the change in input shaft speed. If all indicators meet the design requirements, the test is reported as successful to the test bench. If the design requirements are not met, the test is repeated. If the design requirements are still not met after the repeated test, the test is reported as failed and the parts are returned for repair. If all indicators meet the design requirements after the repeated test, the test is reported as successful to the test bench.

2. The commercial vehicle AMT off-line testing method according to claim 1, characterized in that, Specifically, it includes the following steps: Step 1: Wait for the test bench to clamp the gearbox; and determine if it is clamped. If it is not clamped, sound an alarm; if it is clamped, proceed to Step 2. Step 2: The bench scans the QR code on the AMT gearbox, selects the corresponding configuration file on the server based on the information read from the scan, and provides DC power and air supply to the TCU and configures the CAN network environment according to the configuration file; and reads the fault code. If there is a hardware fault in the AMT gearbox, it will be returned for repair. If there is no hardware fault, proceed to step 3. Step 3: Verify the software version number information stored in the TCU with the information read from the QR code. If the software version number information is incorrect, return the device for repair and re-flash the software. If the software version number information is correct, proceed to step 4. Step 4: Test the solenoid valve of the clutch actuator. If the solenoid valve of the clutch actuator fails the test, it will be reworked. If the solenoid valve of the clutch actuator passes the test, proceed to step 5. Step 5: Perform transmission self-learning. If successful, proceed to step 6. If it fails, reactivate transmission self-learning. If successful after repeated testing, proceed to step 6. If it still fails after repeated testing, return for repair. Step 6: Perform a brake test. If successful, proceed to step 7. If it fails, repeat the brake test. If the repeated test is successful, proceed to step 7. If the repeated test still fails, return the device for repair. Step 7: Perform NVH testing. If successful, proceed to step 8; otherwise, return the equipment for repair. Step 8: Reset vehicle parameters and clear fault codes.

3. The method for testing the off-line operation of an AMT (Automated Manual Transmission) system in a commercial vehicle according to claim 1, characterized in that, The test bench and the AMT transmission TCU communicate with each other via the UDS protocol.

4. The method for testing the off-line operation of an AMT (Automated Manual Transmission) in a commercial vehicle according to claim 1, characterized in that, The NVH test specifically includes the following process: the NVH testing equipment is placed firmly against the gearbox housing; after the test bench sends an NVH test command to the TCU, the front motor of the test bench operates at 80 RPM, the TCU performs a gear engagement action, the test bench receives feedback from the TCU, and when the TCU completes gear engagement, the front motor of the test bench increases its speed from 300 RPM to 1500 RPM, while the rear motor provides a load matching the gear; the front motor runs at a constant speed for 5 seconds and then decreases its speed from 300 RPM to 80 RPM, during which the rear motor provides a load matching the gear; the TCU engages the next gear, and the above steps are repeated until the TCU reports to the test bench that all tests have been completed; throughout the test, the NVH equipment detects the vibration state of the gearbox and determines whether it is qualified. If it is unqualified, the test is immediately stopped and the gearbox is returned for repair.

5. The method for testing the off-line operation of an AMT (Automated Manual Transmission) system in a commercial vehicle according to claim 1, characterized in that, The AMT transmission is mounted on the test bench, which includes the following processes: the AMT transmission is automatically hoisted onto the test bench, the input shaft of the AMT transmission is aligned and inserted into the internal spline of the clutch, and the clutch housing and the flywheel housing of the test bench are clamped together with hydraulic chucks. The output shaft of the test bench is then connected and secured to the transmission flange.

6. The method for testing the off-line operation of an AMT (Automated Manual Transmission) system in a commercial vehicle according to claim 1, characterized in that, After the test is completed, a test report is generated, which records the offline time, gearbox order number, software version number, and gearbox self-learning results; and is uploaded to the server for online storage.

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