Self-adaptive learning control method during clutch engagement process

Abstract

The invention discloses a self-adaptive learning control method during a clutch engagement process. Self-adaptive control is performed in a second stage and a third stage of four stages in the clutchengagement process, with the consideration of the influence of oil temperature, the self-adaptive learning control of the time length [delta]t is performed in the second stage, and thus a first self-learning value that meets the conditions is obtained; the self-adaptive learning control of the given sliding friction target pressure is performed in the third stage, and a second self-learning valuethat meets the conditions is obtained; and by applying the first self-learning value and the second self-learning value in a next cycle, the clutch engagement pressure is corrected in time and self-learning is performed. According to the self-adaptive learning control method, the clutch engagement state can be monitored in real time, and the state of each stage is used as feedback, so that a clutch meets the requirements of the engagement time and shifting impact degree during the engagement process.

Description

technical field [0001] The invention belongs to the technical field of automobile automatic transmission control, and in particular relates to an adaptive learning control method in the process of clutch engagement. Background technique [0002] The control consistency of the clutch engagement process in the automatic transmission is difficult and one of the key technologies. Of course, when the vehicle is off the assembly line, it can also be learned through the off-line. The normal temperature can basically be covered, but if it is necessary to cover all transmission operating temperature ranges, there is a certain Therefore, in addition to self-learning at the time of off-line, can the adaptive control and self-learning of the clutch engagement process be carried out through the driver's normal operation of the vehicle? In this way, the vehicle gradually corrects the control parameters during several or multiple shifts to meet the driver's comfort requirements for shiftin...

AI Technical Summary

Problems solved by technology

[0003] There are the following main points and problems in the clutch combination (also called engagement) control of automatic transmissions. First, the shorter the combination time control, the better to meet the quick start performance of the vehicle. Second, the smoothness of the combination, that is, the shifting shock. Generally, it is more appropriate to control the range of less than 0.5g. The clutch combination of a single transmission can be calibrated, and it is easy to achieve fast clutch combination and better impact. However, due to the cumulative error of each size chain, such as There are factors such as the gap error of the clutch friction plate, the deformation error of the return spring, the size error of the valve block hole, and the characteristic error of the driving solenoid valve, which lead to a large difference in the total error of each transmission clutch. If the error of the hardware size is simply controlled, it will increase virtually. hardware production cost

Images