Control method for non-simple gear shifting of automatic speed changer

Abstract

The invention discloses a control method for non-simple gear shifting of an automatic speed changer. After the non-simple gear shifting condition is met and a current gear GC, a target gear GT and a preselected gear GP are determined, pressure reduction control of a cut-off clutch OG2 from the target gear GT to the preselected gear GP and oil charging control of a joint clutch OC2 from the targetgear to the preselected gear are conducted in the clutch control process from current gear GC and the target gear GT; after the current gear GC reaches the target gear GT, the target gear GT serves asa new current gear GC at the moment, the preselected gear GP serves as a new target gear GT, and subsequent clutch control from the new current gear GC to the new target gear GT continues to be conducted; thus, the control logic of non-simple gear shifting is achieved; through pressure control of the clutches, two times of gear shifting is turned into one-time gear shifting, so that the whole gear-shifting speed changing process is conducted continuously, the gear shifting time is shortened, and the power performance of a vehicle is promoted.

Description

technical field [0001] The invention relates to a non-simple shift control method of an automatic transmission. Background technique [0002] Power performance is an important indicator of vehicle performance, and it is also a goal for various OEMs to improve. From the perspective of the transmission system, improving the power performance is to improve the power performance of the engine on the one hand, and on the other hand, it is to improve the power performance by downshifting and increasing the speed ratio from the perspective of the transmission. Usually, the shift control of the hydraulic automatic transmission is limited by the shift logic design, and only a simple shift logic control can be performed, that is, there is only one disengaging clutch and one engaging clutch in the shift process, so that the closed-loop control of the speed can be guaranteed. But the driver needs different transmission gears under different vehicle speeds and throttles, and it is impos...

AI Technical Summary

Problems solved by technology

For this kind of multi-gear downshift, the driver generally has a relatively strong power demand. If the target gear is reached by two simple shifts, it will inevitably cause a large power delay and cause the driver to complain.

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