An automated durability testing method and system for hydraulic automatic transmission assemblies

Abstract

This invention discloses an automated durability testing method and system for a hydraulic automatic transmission assembly, belonging to the field of automatic transmission assembly testing. By initializing and setting the lock-up clutch of the hydraulic automatic transmission assembly and controlling the rate of change of motor speed, the speed ratio can be more precisely controlled, improving the reliability of durability testing. Limiting the corresponding gears by using the synchronization point reached by the drive motor and the loading motor improves the smoothness of durability testing. This method can achieve information interaction with the transmission TCU control system, dynamically realizing information sharing and coordinated work to improve testing efficiency. Using a load spectrum based on real operating conditions, the loading test is performed cyclically, and the loading time is dynamically allocated to reproduce the real operating conditions of the transmission. Automated and intelligent testing of 14 operating conditions for 6 forward gears and 1 reverse gear of the hydraulic automatic transmission assembly is completed, saving testing time and improving the reliability of durability testing.

Description

Technical Field

[0001] This invention belongs to the field of automatic transmission assembly testing, specifically relating to an automated durability testing method and system for hydraulic automatic transmission assemblies. Background Technology

[0002] The drivetrain is crucial in automotive design. Its function is to resolve the conflict between the speed and torque output by the vehicle's powertrain and the speed and torque required by the drive wheels. Specifically, by changing the gear ratio, the drivetrain adjusts the system's performance and transmits power to the wheels to adapt to external loads and road conditions. Therefore, the drivetrain has a significant impact on vehicle handling performance.

[0003] Hydraulic automatic transmissions are widely used in passenger cars, buses, heavy vehicles, and commercial vehicles, and are currently the mainstream type of automatic transmission. This type of transmission is the earliest used, most mature, and most widely applied type of automatic transmission. A hydraulic automatic transmission mainly consists of a hydraulic transmission device, a shift mechanism, a hydraulic control system, a cooling and lubrication system, and a transmission housing. Engine power is input to the transmission via a hydraulic torque converter, achieving a flexible connection between the engine and transmission, thereby significantly reducing the dynamic load on the transmission mechanism and extending the service life of both the engine and transmission. Simultaneously, it achieves continuously variable transmission (CVT) and torque conversion within a certain range. Because hydraulic automatic transmissions are high-tech products integrating mechanics, hydraulics, and control, their complex structure, high precision, numerous components, and high cost often lead to various problems during testing.

[0004] Existing testing methods and systems use bench control to measure speed and torque, and the transmission TCU controls transmission actions (shifting, locking, etc.). These are independent systems with no communication or information exchange between them. When a product malfunctions, it cannot be stopped in time, which can easily damage the product. Furthermore, existing testing methods use a sequential loading method, which differs significantly from actual operating conditions and cannot truly reflect the actual working condition of the transmission. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an automated durability testing method and system for hydraulic automatic transmission assemblies. Using this system and method, information interaction with the transmission TCU control system can be achieved, improving testing efficiency and accurately reflecting the actual working condition of the transmission.

[0006] To achieve the above objectives, the present invention employs the following technical content:

[0007] An automated durability testing method for a hydraulic automatic transmission assembly includes the following steps:

[0008] S1: Initialize the lock-up clutch of the hydraulic automatic transmission assembly and output the clutch status quantity;

[0009] S2: Based on the clutch status, switch to Speed-speed mode and set the speed of the drive end and the loading end. Switch to Torque-Speed ​​mode and sequentially activate the 1st to 6th gear preload conditions and main loading conditions, and output the forward gear status.

[0010] S3: Based on the forward gear status quantity, reset the transmission gear setting, switch to Speed-speed mode and set the speed of the drive end and loading end, switch to Torque-Speed ​​mode, enable reverse gear preload condition and main loading condition, and output reverse gear status quantity;

[0011] S4: Based on the reverse gear status, enter the loop mode and determine whether the number of executions has reached the loop count. If the number of executions has reached the loop count, output the test result; otherwise, repeat S2 and S3.

[0012] Furthermore, before executing S1, the hydraulic automatic transmission assembly is switched sequentially to Idle-idle mode and Speed-idle mode, the drive end speed is set to 600 rpm, and the transmission gear is set to 1st gear.

[0013] Furthermore, in S1, the specific steps for initialization are as follows:

[0014] Set the lock-up clutch to gear 0, start mode 1; set the lock-up clutch to gear 1, start mode 2; output clutch status quantity.

[0015] Furthermore, after setting the lock-up clutch to gear 0, a judgment is made. If the torque converter lock-up pressure is less than the first preset pressure value, the next step is continued; otherwise, the lock-up clutch is reset to gear 0.

[0016] Furthermore, after setting the lock-up clutch to gear 1, a judgment is made. If the torque converter lock-up pressure is greater than the second preset pressure value, the next step is continued; otherwise, the lock-up clutch gear is reset to gear 1.

[0017] Furthermore, in S2, the rotational speeds of both the drive end and the load end are set to 1100 rpm.

[0018] Furthermore, in S3, the specific steps for resetting the transmission gear settings are as follows: set the transmission gear to 6th gear, set the transmission gear to 5th gear, set the transmission gear to 4th gear, set the transmission gear to 3rd gear, set the transmission gear to 2nd gear, set the transmission gear to 1st gear, and set the transmission gear to 0th gear.

[0019] Furthermore, in S3, the speed of the drive end is set to 1100 rpm, and the speed of the loading end is set to -1100 rpm.

[0020] Furthermore, before S4 is executed, the lock-up clutch is set to gear 0, and the transmission gear is set to gear 0.

[0021] An automated durability testing system for a hydraulic automatic transmission assembly, comprising the steps of the aforementioned automated durability testing method for a hydraulic automatic transmission assembly, including:

[0022] The lock-up clutch control module is used to initialize and set the lock-up clutch of the hydraulic automatic transmission assembly and output clutch status variables.

[0023] The forward gear shift control module is used to switch to Speed-speed mode and set the speed of the drive end and the loading end according to the clutch status, and switch to Torque-Speed ​​mode to sequentially activate the 1st to 6th gear preload working conditions and main loading working conditions, and output the forward gear status value.

[0024] The reverse gear control module is used to reset the transmission gear settings based on the forward gear status, switch to Speed-speed mode and set the speed of the drive end and loading end, switch to Torque-Speed ​​mode, enable reverse gear pre-loading condition and main loading condition, and output reverse gear status value;

[0025] The loop control module is used to enter the loop mode based on the reverse gear status, determine whether the number of executions has reached the loop count, and output the test result if the number of executions has reached the loop count; otherwise, it repeats the working process of the forward gear shift control module and the reverse gear control module.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] This invention provides an automated durability testing method for hydraulic automatic transmission assemblies. The method first initializes the lock-up clutch of the hydraulic automatic transmission assembly. By controlling the rate of change of the motor speed, the gear ratio is more precisely controlled, improving the reliability of the durability test. The corresponding gear is limited by the synchronization point reached by the drive motor and the loading motor, thus improving the smoothness of the durability test, which is caused by the oscillation of the gear ratio change rate in mechanical gear clutches, resulting in repeated engagement and disengagement. This method can interact with the transmission TCU control system, dynamically sharing information and coordinating their work to improve testing efficiency. Furthermore, it uses a load spectrum based on real operating conditions, performing cyclic loading tests and dynamically allocating the loading time to reproduce the actual operating conditions of the transmission. The method has completed automated and intelligent testing of 14 operating conditions for 6 forward gears and 1 reverse gear of the hydraulic automatic transmission assembly, saving testing time, improving the reliability of the durability test, and showing good prospects for widespread application.

[0028] This invention also provides an automated durability testing system for hydraulic automatic transmission assemblies, used to implement the steps of the aforementioned automated durability testing method for hydraulic automatic transmission assemblies. This system has a simple structure and can realize the automation, intelligence, and efficiency of the automated durability testing method for hydraulic automatic transmission assemblies. Attached Figure Description

[0029] Figure 1 A flowchart of an automated durability testing method for a hydraulic automatic transmission assembly provided in an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the lock-up clutch control module provided in an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of the forward gear shifting control module provided in an embodiment of the present invention;

[0032] Figure 4 A schematic diagram of the reverse gear control module provided in an embodiment of the present invention;

[0033] Figure 5 A schematic diagram of the principle of the loop control module provided in an embodiment of the present invention;

[0034] Figure 6 A schematic diagram of an automated durability testing system for a hydraulic automatic transmission assembly provided by the present invention;

[0035] Figure 7 The flowchart of an automated durability testing method for a hydraulic automatic transmission assembly provided by the present invention is shown. Detailed Implementation

[0036] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0037] like Figure 7 As shown, the present invention provides an automated durability testing method for a hydraulic automatic transmission assembly, comprising the following steps:

[0038] Preparation before execution: Switch the hydraulic automatic transmission assembly to Idle-idle mode and Speed-idle mode in sequence, set the drive speed to 600 rpm, and set the transmission gear to 1st gear.

[0039] S1: Initializes the lock-up clutch of the hydraulic automatic transmission assembly and outputs clutch status parameters.

[0040] The specific steps for initialization are as follows:

[0041] Set the lock-up clutch to gear 0, start mode 1; set the lock-up clutch to gear 1, start mode 2; output clutch status quantity.

[0042] After setting the lock-up clutch to gear 0, a judgment is made. If the torque converter lock-up pressure is less than the first preset pressure value, the next step is continued; otherwise, the lock-up clutch is reset to gear 0.

[0043] After setting the lock-up clutch to gear 1, a judgment is made. If the torque converter lock-up pressure is greater than the second preset pressure value, the next step is continued; otherwise, the lock-up clutch gear is reset to gear 1.

[0044] S2: Based on the clutch status, switch to Speed-speed mode and set the speed of the drive end and the loading end. Set the speed of the drive end and the loading end to 1100rpm. Switch to Torque-Speed ​​mode and sequentially activate the 1st to 6th gear preload conditions and main load conditions, and output the forward gear status.

[0045] S3: Based on the forward gear status quantity, reset the transmission gear setting, switch to Speed-speed mode and set the speed of the drive end and the loading end. Set the speed of the drive end to 1100 rpm and the speed of the loading end to -1100 rpm; switch to Torque-Speed ​​mode, enable reverse gear preload condition and main loading condition, and output reverse gear status quantity.

[0046] The specific steps for resetting the transmission gear are as follows: set the transmission gear to 6th gear, set the transmission gear to 5th gear, set the transmission gear to 4th gear, set the transmission gear to 3rd gear, set the transmission gear to 2nd gear, set the transmission gear to 1st gear, and set the transmission gear to 0th gear.

[0047] Set the lock-up clutch to 0 gear and the transmission to 0 gear.

[0048] S4: Based on the reverse gear status, enter the loop mode and determine whether the number of executions has reached the loop count. If the number of executions has reached the loop count, output the test result; otherwise, repeat S2 and S3.

[0049] like Figure 6 As shown, the present invention also provides an automated durability testing system for a hydraulic automatic transmission assembly, used to implement the steps of the aforementioned automated durability testing method for a hydraulic automatic transmission assembly, including: a lock-up clutch control module, a forward gear shifting control module, a reverse gear control module, and a cycle control module; the lock-up clutch control module is used to initialize and set the lock-up clutch of the hydraulic automatic transmission assembly and output clutch status values; the forward gear shifting control module is used to switch to Speed-speed mode and set the speed of the drive end and the loading end according to the clutch status value, switch to Torque-Speed ​​mode, and sequentially activate 1— The system includes six gear preload and main load modes, outputting forward gear status values. The reverse gear control module resets the transmission gear settings based on the forward gear status value, switches to Speed-speed mode and sets the speeds of the drive and load ends, switches to Torque-Speed ​​mode, activates the reverse gear preload and main load modes, and outputs the reverse gear status value. The loop control module enters loop mode based on the reverse gear status value, determines whether the execution count has reached the loop count, and outputs the test result if the execution count has reached the loop count; otherwise, it repeats the operation processes of the forward gear shift control module and the reverse gear control module.

[0050] The present invention will be further explained and described below with reference to the accompanying drawings and embodiments:

[0051] Example

[0052] This embodiment provides an automated durability testing method for a hydraulic automatic transmission assembly, such as... Figure 1As shown, this process can complete the durability test of a hydraulic automatic transmission assembly with 6 forward gears and 1 reverse gear, and it is fully automated. The automated durability testing method for hydraulic automatic transmission assemblies can achieve the following functions: drive motor control function; loading motor control function; control mode switching function; lock-up clutch lock-up control function; transmission gear control function; automatic cycle control function; automatic data recording function, etc.; it can realize the test method of shifting, speed adjustment, lock-up, loading, unloading and unlocking program sets for each gear.

[0053] The following patterns are explained in detail:

[0054] Idle-idle mode is the idle speed mode, Speed-idle mode is the speed idle mode, Torque-Speed ​​mode is the torque speed mode, and Speed-speed mode is the speed speed mode.

[0055] This embodiment provides an automated durability testing system for a hydraulic automatic transmission assembly, including a lock-up clutch control module, a forward gear shifting control module, a reverse gear control module, and a cycle control module;

[0056] The testing process for the lock-up clutch control module is as follows:

[0057] like Figure 2 As shown, this mainly controls the lock-up clutch of the hydraulic automatic transmission assembly and collaboratively performs durability tests on the hydraulic automatic transmission assembly at each gear. Based on the input status, the lock-up clutch gear is set to 0. Then, the lock-up clutch pressure is checked. If it is less than 0.5 bar, module 1 (mode 1) is entered; if it is greater than or equal to 0.5 bar, the lock-up clutch gear is returned to 0, and the process repeats. After entering module 1, relevant logic checks are performed, then the lock-up clutch gear is set to 1. Next, the lock-up clutch pressure is checked. If it is greater than 10 bar, module 2 (mode 2) is entered; if it is less than or equal to 10 bar, the lock-up clutch gear is returned to 1, and the process repeats. After entering module 2, relevant logic checks are performed, and the output status is completed.

[0058] The testing process for the forward gear shift control module is as follows:

[0059] like Figure 3As shown, it mainly controls the six forward gears of the hydraulic automatic transmission assembly and collaboratively completes the durability test of the hydraulic automatic transmission assembly. Upon entering module 3 (mode 3) based on the front-end input status, relevant logic judgments are performed, then the Speed-Speed ​​mode is switched, simultaneously setting the drive end speed to 1100 rpm and the loading end speed to (1000 / ix) rpm. Then, the Speed-idle mode is switched, and upon entering module 3 again, relevant logic judgments are performed, then the Torque-Speed ​​mode is switched to perform the pre-loading and main loading conditions for the forward gears, completing the output status.

[0060] The testing process for the reverse gear control module is as follows:

[0061] like Figure 4 As shown, this mainly controls one reverse gear of the hydraulic automatic transmission assembly and collaboratively completes the durability test of the hydraulic automatic transmission assembly. Through front-end input, the system enters the following states: setting the transmission gear to 6, 5, 4, 3, 2, 1, and 0. After entering module 5 (mode 5), relevant logic judgments are performed, then the system switches to Speed-Speed ​​mode, simultaneously setting the drive end speed to 1100 rpm and the loading end speed to -(1000 / ix) rpm. Then, the system switches to Speed-idle mode, enters module 6, performs relevant logic judgments, and then switches to Torque-Speed ​​mode to perform the pre-loading and main loading conditions for reverse gear, completing the output state.

[0062] The test process handled by the loop control module is as follows:

[0063] like Figure 5 As shown, the automated durability test method for the hydraulic automatic transmission assembly starts by entering the forward gear durability test, then the reverse gear durability test, completing one cycle test. Then it enters the set cycle number N. If it equals N, it ends; if it does not equal N, it starts again and continues the cycle until the cycle number equals N, then it ends and outputs the final test result.

[0064] Cyclic durability control module test method: such as Figure 5 As shown, the automated durability test method for the hydraulic automatic transmission assembly first enters the forward gear durability module, then enters the reverse gear durability module to complete one cycle test. Then it enters the set cycle number N. If it is equal to N, it ends; if it is not equal to N, it enters the start and continues the cycle until the cycle number is equal to N, then it ends.

[0065] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. An automated durability testing method for a hydraulic automatic transmission assembly, characterized in that, Includes the following steps: S1: Initialize the lock-up clutch of the hydraulic automatic transmission assembly and output the clutch status quantity; S2: Based on the clutch status, switch to Speed-speed mode and set the speed of the drive end and the loading end. Switch to Torque-Speed ​​mode and sequentially activate the 1st to 6th gear preload conditions and main loading conditions, and output the forward gear status. S3: Based on the forward gear status quantity, reset the transmission gear setting, switch to Speed-speed mode and set the speed of the drive end and loading end, switch to Torque-Speed ​​mode, enable reverse gear preload condition and main loading condition, and output reverse gear status quantity; S4: Based on the reverse gear status, enter the loop mode, determine whether the number of executions has reached the loop count, and if the number of executions has reached the loop count, output the test result; Otherwise, repeat steps S2 and S3.

2. The automated durability testing method for a hydraulic automatic transmission assembly according to claim 1, characterized in that, Before executing S1, switch the hydraulic automatic transmission assembly to Idle-idle mode and Speed-idle mode in sequence, set the drive speed to 600 rpm, and set the transmission gear to 1st gear.

3. The automated durability testing method for a hydraulic automatic transmission assembly according to claim 1, characterized in that, The specific steps for initialization in S1 are as follows: Set the lock-up clutch to gear 0, start mode 1; set the lock-up clutch to gear 1, start mode 2; output clutch status quantity.

4. The automated durability testing method for a hydraulic automatic transmission assembly according to claim 3, characterized in that, After setting the lock-up clutch to gear 0, a judgment is made. If the torque converter lock-up pressure is less than the first preset pressure value, then the next step is executed. Otherwise, reset the lock-up clutch to gear 0.

5. The automated durability testing method for a hydraulic automatic transmission assembly according to claim 3, characterized in that, After setting the lock-up clutch to gear 1, a judgment is made. If the torque converter lock-up pressure is greater than the second preset pressure value, then the next step is executed. Otherwise, reset the lock-up clutch to first gear.

6. The automated durability testing method for a hydraulic automatic transmission assembly according to claim 1, characterized in that, In S2, the rotational speeds of both the drive end and the load end are set to 1100 rpm.

7. The automated durability testing method for a hydraulic automatic transmission assembly according to claim 1, characterized in that, In S3, the specific steps for resetting the transmission gear settings are as follows: set the gear in sequence: set the transmission gear to 6th gear, set the transmission gear to 5th gear, set the transmission gear to 4th gear, set the transmission gear to 3rd gear, set the transmission gear to 2nd gear, set the transmission gear to 1st gear, and set the transmission gear to 0th gear.

8. The automated durability testing method for a hydraulic automatic transmission assembly according to claim 1, characterized in that, In S3, the speed of the drive end is set to 1100 rpm, and the speed of the load end is set to -1100 rpm.

9. The automated durability testing method for a hydraulic automatic transmission assembly according to claim 1, characterized in that, Before executing S4, set the lock-up clutch to 0 gear and the transmission to 0 gear.

10. An automated durability testing system for a hydraulic automatic transmission assembly, used to implement the steps of the automated durability testing method for a hydraulic automatic transmission assembly as described in any one of claims 1-9, characterized in that, include: The lock-up clutch control module is used to initialize and set the lock-up clutch of the hydraulic automatic transmission assembly and output clutch status variables. The forward gear shift control module is used to switch to Speed-speed mode and set the speed of the drive end and the loading end according to the clutch status, and switch to Torque-Speed ​​mode to sequentially activate the 1st to 6th gear preload working conditions and main loading working conditions, and output the forward gear status value. The reverse gear control module is used to reset the transmission gear settings based on the forward gear status, switch to Speed-speed mode and set the speed of the drive end and loading end, switch to Torque-Speed ​​mode, enable reverse gear pre-loading condition and main loading condition, and output reverse gear status value; The loop control module is used to enter loop mode based on the reverse gear status, determine whether the number of executions has reached the loop count, and output the test result if the number of executions has reached the loop count. Otherwise, the working process of the forward gear shift control module and the reverse gear control module will be repeated.

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