Transmission gear shifting control method suitable for gear failure

Abstract

The invention relates to a transmission gear shifting control method suitable for gear failure. The transmission gear shifting control method is characterized by comprising the following specific steps: calculating a gear shifting rule of a whole vehicle under different accelerator opening degrees according to the universal characteristics curve of an engine and the forward gear ratio; performing table lookup on the gear shifting rule according to the current accelerator opening degree to obtain a basic upshift point Max(N) and a downshift point Min(N); determining an upshift engine speed correction factor MaxF(N+1) and a downshift engine speed correction factor MinF(N+1) of each gear shifting point according to a failure state of a forward gear; obtaining a new upshift point MaxNew(N) and a new downshift point MinNew(N); and when the whole vehicle reaches the speed for gear shifting in the step 4, indicating gear shifting for the whole vehicle. According to the transmission gear shifting control method suitable for gear failure, the gear shifting rule can be dynamically adjusted in real time according to the failure state of the current gear, the optimal economy gear shifting rule curve can be fitted, and the economy and the dynamic property of the whole vehicle are improved.

Description

technical field [0001] The invention relates to a gear shift control method of a transmission adapted to gear failure, and is a gear shift control method of an automatic transmission. Background technique [0002] The intelligent shifting strategy of automobiles aims at the best economy or the best power performance, and determines the best shifting schedule according to the universal characteristic curve of the engine, combined with the operating conditions of the vehicle, the driver's intention and real-time road conditions. At present, there are mainly the following types of shift rules for automatic transmissions: single parameter, the shift point is determined according to the vehicle speed; two parameters, the shift point is determined according to the vehicle speed and accelerator opening; Determine the shift point. [0003] The formulation of the above shifting rules is mainly based on the driver's intention and road condition information. When the vehicle's gears f...

AI Technical Summary

Problems solved by technology

During this process, on the one hand, the engine speed rises too high to make the driver uncomfortable, and on the other hand, the economy of the whole vehicle is reduced; similarly, the whole vehicle can only be shifted from 3rd gear to 1st gear at a very low speed. When the engine speed is too low, it may cause flameout

[0004] From the above analysis, it can be seen that the failure of the vehicle gear will not only affect the economy and power of the vehicle, but also cause serious problems such as speeding and engine flameout.

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