Off-gear judging and treating method for dual-clutch automatic transmission

Abstract

The invention relates to an off-gear judging and treating method for a dual-clutch automatic transmission. The dual-clutch automatic transmission comprises two transmission devices. Each of the two transmission devices is composed of a wet clutch, a cooling device of the wet clutch and a transmission gear set. Totally seven forward gears and one reverse gear are arranged, wherein the R gear, the second gear, the fourth gear and the sixth gear are even-shaft gears, and the first gear, the third gear, the fifth gear and the seventh gear are odd-shaft gears. The transmission further comprises two clutch rotating speed sensors, one output shaft rotating speed sensor and four shifting fork position sensors. Monitoring and judging of the gear off-gear state are conducted on the gear to be engaged and the current gear at the same time with the combination of the position of a transmission gear shifting fork, the moving speed of the shifting fork, the rotating speed of an input shaft, the rotating speed of an output shaft and other information for a dual-clutch automatic transmission mechanical structure. After the off-gear state is confirmed through the judgment, the optimal supplementary-engagement gear is selected according to the differences of the off-gear state, the working gear and the gear to be engaged, and the supplementary-engagement action is coordinately controlled.

Description

technical field [0001] The invention relates to a gear-off judging and processing method of a dual-clutch automatic transmission, belonging to the field of shift control of the dual-clutch automatic transmission. Background technique [0002] The transmission is an important part of the automobile transmission system, and its important role is to realize safe and reliable transmission of power under different gears. If the vehicle suddenly disengages from the current gear during driving, it will cause the vehicle to lose power instantly, endangering the safety of the vehicle and affecting the drivability of the vehicle. [0003] In the patent CN 102072319 A, a synchronizer monitoring method used in dual clutch automatic transmissions is introduced. The method transmits signals to the electronic control unit through sensors arranged at each test gear point of the synchronizer, and the electronic control unit transmits signals according to the transmitted The test point signa...

AI Technical Summary

Problems solved by technology

First of all, the invention only relies on the feedback signals of the sensors at each test point of the synchronizer for the judgment of disengagement, and does not comprehensively consider the signals such as the input shaft and output shaft speed. Due to the influence of signal reliability, it is impossible to make a fast and accurate judgment on disengagement

Secondly, this method presets the position values ​​of each test point. Due to individual differences in transmission production, it cannot be guaranteed that the preset value is applicable to multiple transmissions, which is very easy to cause misjudgment

Again, this method sets sensors at each synchronizer gear test point and judges them one by one, which increases the hardware cost and the workload of the electronic control unit

In addition, the invention does not describe how the electronic control unit performs optimal disengagement processing according to different disengagement conditions, so as to ensure the safety and drivability of the vehicle

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