Test measurement method for critical parking speed of P-shift parking of automatic gearbox

Abstract

The invention discloses a test measurement method for a critical parking speed of P-shift parking of an automatic gearbox. The test measurement method comprises the following steps: 1) the automatic gearbox to be tested is arranged on a test measurement device, and a corresponding rotational speed and torque sensor, a drive motor and a data acquisition unit are selected; 2) the flywheel panel inertia of an inertia flywheel case is adjusted; 3) a shifter and a shifting inhaul cable are arranged on the test measurement device; 4) the drive motor is controlled by a computer according to test requirements; the rotation speed and torque data of a half-shaft is stored, processed and displayed by the computer in real time in the whole test process; 5) the speed of the half-shaft of the last moment when the rotation speed of the half-shaft turns to 0 abruptly is obtained through analysis of the computer, and the rotation speed of the half-shaft is converted into corresponding vehicle speed, namely the critical parking speed of P-shift parking of the automatic gearbox. According to the invention, the critical parking speed of the P-shift parking is accurately measured by simulating the whole vehicle working condition of the automatic gearbox, so that a strong and firm support is provided for the test of the critical parking speed of the P-shift parking of the automatic gearbox.

Description

technical field [0001] The invention belongs to the technical field of automobile testing, and in particular relates to an automatic transmission P gear parking performance test and measurement method in an automobile power system. More specifically, the invention relates to a P gear parking critical parking speed test and measurement method for an automatic transmission. Background technique [0002] With the development of automobile transmission technology, automatic transmission has become an important development direction of automobile transmission due to its characteristics of easy operation, comfortable driving and smooth shifting. As an important part of the automatic transmission, the P-block parking mechanism is composed of a locking gear, a locking pawl and a set of parking actuators. Usually, the locking gear is connected to the transmission output shaft, and the locking pin The pawl and the parking actuator are fixed on the transmission housing. When the aut...

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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