Self-learning method and device of clutch torque characteristics of double-clutch automatic gearbox

Abstract

The invention provides a self-learning method and device of clutch torque characteristics of a double-clutch automatic gearbox. The method comprises the steps that when a clutch in the double-clutch automatic gearbox starts to work and is in a slipping friction state, the target engine rotating speed and the target engine torque are obtained, and the target clutch torque is computed according to the target engine rotating speed and the target engine torque; the observation clutch torque is computed according to the target engine rotating speed, the target engine torque and the target clutch torque; a first target clutch position is computed according to the clutch temperature, the target clutch torque and a preset weight; and the preset weight is modified and updated according to the first target clutch position and the current clutch position. According to the method, the relationship between the clutch transmission torque and the position and between the clutch transmission torque and the temperature can be learned in real time in the gear shifting process of the automatic gearbox, and adverse influence to gearbox control due to the changes of the clutch torque characteristics can be eliminated.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a clutch torque characteristic self-learning method and device of a dual-clutch automatic transmission. Background technique [0002] As the clutch usage time increases, the clutch will wear to a certain extent, and its clutch torque characteristics will also change accordingly. The clutch torque characteristics have a certain impact on the gear control of the clutch gearbox, which can affect the quality of shifting, and then can Affect driving comfort and safety. Therefore, it is very important to learn the clutch torque characteristics. [0003] At present, the relationship data between the transmitted torque and the clutch position in the vehicle are all obtained through experiments. First, learn the clutch slipping position (that is, the position where the clutch starts to transmit torque) through the learning method of the clutch slipping position, then calculate the c...

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Problems solved by technology

[0004] However, the above method of learning clutch torque characteristics through experiments has the following problems: the accuracy of learning the clutch slipping position is low, and the learning error is relatively large. The corresponding learning error is amplified when calculating the clutch characteristic curve, resulting in the learned clutch characteristic curve There is a certain error with the actual clutch characteristic curve

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