A Synchronization Process Control Method of Synchronizer Speed ​​with Pressure Compensation

Abstract

The invention discloses a synchronizer rotation speed synchronous process control method with pressure compensation. The synchronizer rotation speed synchronous process control method specifically comprises the steps that firstly, basic synchronous force is obtained, and PID adjustment is conducted in the rotation speed synchronizing process; secondly, the relation between the rotation speed difference delta n on the two sides of a synchronizer and the critical rotation speed difference delta n' is judged, and when delta n is larger than delta n', the third step is conducted; thirdly, the actual rotation speed change rate delta tgt and the target rotation speed change rate delta<0>tgt are compared, and when delta tgt is smaller than delta<0>tgt, the fourth step is conducted; fourthly, thecompensation pressure is increased on the basis of the current basic synchronous force, the added compensation force pac and the compensation time t are linearly increased to meet the following formula: pac=k x t, wherein the k is the changing slope of the compensation pressure along with time, the rotation speed difference delta n is detected at a certain time interval, if delta n is larger thandelta n', the compensation time t is detected, and if t is smaller than tc, the fourth step is repeatedly conducted, wherein tc is the critical compensation time. According to the provided control method, at the rotation speed synchronizing stage, the pressure compensation strategy is added on the basis of feedforward pressure and the PID control manner, and accordingly, the synchronous process rotation speed difference is controlled to be stably reduced.

Description

technical field [0001] The invention relates to the technology in the field of automobile transmission, in particular to a method for controlling the speed synchronization process of a synchronizer with pressure compensation. Background technique [0002] The shifting process of the usual automatic transmission can generally be divided into the following four stages: P1: Synchronizer pre-filling stage, the purpose is to eliminate the gap in the oil chamber; P2: Shifting fork free travel stage, from the shifting fork to the shifting fork The end of movement to the position of the synchronous point; P3: speed synchronization phase, from when the shift fork reaches the synchronous point to the completion of speed synchronization between the engagement sleeve and the ring gear to be engaged; P4: the completion stage of the shift process, from speed synchronization to the shift fork entering a steady state The completion stage of the blocking position. [0003] For the control o...

AI Technical Summary

Problems solved by technology

However, PID adjustment has certain limitations, that is, if the set adjustment range is too large, it will easily cause pressure shocks and affect the control effect; The effect of shortening the speed synchronization time makes it difficult to meet the control requirements

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