Rotating speed synchronous control method for non-synchronizer type AMT transmission in gear shifting process

Abstract

The invention discloses a rotating speed synchronous control method for a non-synchronizer type AMT transmission in the gear shifting process. The method includes the following steps that first, the AMT transmission begins to shift a gear; second, the AMT controls a gear-shifting sliding sleeve to act, and the sliding sleeve is made to prepare for engaging a gear; third, the AMT judges whether up-shifting or down-shifting is conducted; fourth, if up-shifting happens, the AMT calculates the rotating speed n needing to be reached by an engine in the up-shifting process and controls the engine to further control a transmission brake to act; fifth, if down-shifting happens, the AMT calculates the rotating speed n' needing to be reached by the engine in the down-shifting process and controls a clutch to be engaged; sixth, the synchronizing process of the rotating speed is ended, and a TCU controls the gear-shifting sliding sleeve to act, so that a needed gear is engaged. The AMT is used for calculating the rotating speed, corresponding to a target shift gear, needing to be reached by the engine in the up-shifting or down-shifting process, the transmission brake is controlled to brake or the clutch is controlled to be engaged, the rotating speed of the target shift gear is made to be decreased or increased, the difference of the rotating speed of the sliding sleeve of a gear-shifting mechanism and the rotating speed of the target shift gear is controlled more accurately, and the synchronizing process is quicker.

Description

technical field [0001] The invention relates to a speed synchronous control method of an asynchronous AMT transmission in the shifting process. Background technique [0002] During the shifting process of the transmission, since the speed ratio of the target gear is different from the speed ratio of the current gear, that is, the speed difference between the speed of the shift sleeve and the gear of the target gear is large, the synchronization process must be completed first, even if the two The gear can only be engaged after the rotational speed difference reaches a certain range, otherwise it will cause the phenomenon that the teeth are hit or the teeth on the top of the addendum cannot be engaged. For the previous mechanical manual transmission, the driver manually controlled the clutch and the engine speed to achieve synchronization. The speed difference was difficult to be accurate and the gear grinding sound was loud. However, for the non-synchronized AMT transmissio...

AI Technical Summary

Problems solved by technology

For the previous mechanical manual transmission, the driver manually controlled the clutch and the engine speed to achieve synchronization, the speed difference was difficult to be accurate, and the sound of rattling was loud

However, for the non-synchronized AMT transmission without transmission brake, its synchronous control has the problems of low precision and slow speed.