A shift fork control method for engaging and removing gears of a single taper lock ring synchronizer

Abstract

The invention discloses a shifting fork control method for gear engagement of a single-cone lock ring synchronizer. The shifting fork control method comprises the steps that 1, the positions includinga positive-direction steady-state gear engagement point PA, a negative-direction steady-state gear engagement point PB, a positive-direction synchronous point SA, a negative-direction synchronous point SB, a positive-direction critical point NA, a negative-direction critical point NB and a zero point N0 located on the same shifting fork are predetermined; 2, a current gear engagement target gearposition is determined when a speed reducer synchronizer completes actions; the shifting fork displacement value is acquired through a shifting fork position sensor; when the shifting fork displacement value delta is less than or equal to PB, gear engagement succeeds; when the shifting fork displacement value delta is greater than PB and less than SB, the shifting fork is located between the negative-direction steady-state gear engagement point PB and the negative-direction synchronous point SB, gear engagement fails, and gear driving is continued. The invention further provides the shifting fork control method for gear disengagement of the single-cone lock ring synchronizer. The action time of the synchronizer is shortened, and the failure probability of the synchronizer is reduced.

Description

Technical field [0001] The present invention relates to the technical field of synchronizer control, and more specifically, the present invention relates to a shift fork control method of a single-cone lock ring synchronizer for shifting and unshifting. Background technique [0002] The single cone lock ring synchronizer can be applied to automobile gearboxes with synchronizers, such as AMT gearboxes (electrically controlled mechanical automatic gearboxes), DCT gearboxes (dual clutch gearboxes) and some new energy vehicle gearboxes. Because the pure electric vehicle gearbox without the synchronizer has the inevitable abnormal noise and shift shock problems, the synchronizer is particularly important. The performance of the synchronizer directly affects the handling, power and fuel economy of the vehicle. Synchronizer action time is short, the machining accuracy of its box body, its hydraulic system design, its control strategy and matching data all have high requirements, and the...

AI Technical Summary

Problems solved by technology

Once the synchronizer action fails and there is no effective control method to correct it, it is very likely to cause the car to go into a limp state, and in severe cases, the box will be damaged

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