Test and measurement method for the critical parking speed of automatic transmission in P-block parking

Abstract

The invention discloses a test method for measuring the parking critical parking speed of automatic transmission P gear. Collector; 2) Adjust the inertia of the flywheel disc of the inertia flywheel box; 3) Install the shifter and the shift cable to the test measurement device; 4) The computer controls the drive motor according to the test requirements; The torque data is saved, processed and displayed by the computer in real time; 5) The half-shaft speed at the last moment when the half-shaft speed suddenly changes to zero is obtained through computer analysis, and the half-shaft speed is converted into the corresponding vehicle speed, which is the automatic transmission P gear Parking critical parking speed. The invention can accurately measure the critical parking speed of the P-gear under the simulated automatic transmission vehicle test condition, thereby providing strong support for the test of the P-speed of the automatic transmission.

Description

Technical field [0001] The 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 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 transmission housing. Wh...

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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