Test method of vehicle automatic transmission p-gear parking critical parking speed test

Abstract

The invention discloses a test measuring method for the critical P-gear parking automobile speed of an automobile automatic gearbox. According to the method, a computer regulates the speed of a driving motor to a set rotating speed, and an electrical inertia simulation control model is started; the computer collects the rotating speed of an axle shaft of the automatic gearbox to be measured in real time and obtains the preset rotating speed value of the driving motor at the next moment through calculation, and meanwhile the computer sends the preset rotating speed value to the driving motor in real time, and sequential circulation control is performed; when the rotating speed of the axle shaft meets the requirement for P-gear parking, a tester manually operates a gear shifting device to park at the P gear, and when the computer measures that the rotating speed of the axle shaft is zero, the driving motor is controlled to stop, and one time of testing is ended. The critical P-gear parking automobile speed can be accurately measured through simulating the whole test working conditions of the automobile gearbox, and the accurate and reliable support is provided for test research performed on the critical P-gear parking automobile speed of the automobile gearbox.

Description

Technical field [0001] The present invention belongs to the technical field of automobile testing, and in particular relates to a test method for testing the parking performance of an automatic transmission in a P gear in an automobile power system. More specifically, the present invention relates to a test method for testing the critical parking speed of an automatic transmission in a P gear. Background technique [0002] With the development of automobile transmission technology, automatic transmission has become an important development direction of automobile transmission due to its features such as easy operation, comfortable driving, and smooth shifting. The P-speed parking mechanism is an important part of the automatic transmission. The P-speed parking is composed of a lock gear, a lock pin pawl and a set of parking actuators. Normally, the lock gear is connected to the transmission output shaft and the lock pin The pawl and the parking actuator are fixed to the transmiss...

AI Technical Summary

Problems solved by technology

[0003] At present, the vehicle automatic transmission P-block critical parking speed test mainly adopts the vehicle working condition test method. The test conditions are not only limited by the development progress of the vehicle, but also the test data has poor repeatability and reliability, and cannot In the development stage of the prototype of the automatic transmission, the test and verification of the parking performance of the P gear is realized, and the timeliness of the test is poor

Therefore, how to test and measure the critical parking speed of the automatic transmission in the P gear under the test condition of the whole vehicle simulated on the bench, there is no report on the relevant test and measurement methods at home and abroad at present.

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