Creeping interaction control method and system of dual-clutch automatic transmission automobile

Abstract

The invention provides a creeping interaction control method of a dual-clutch automatic transmission automobile. The method comprises the steps that gearbox information sent by a transmission control unit is acquired; first creeping rotating speed N<ECU> is determined according to the running boundary conditions of an engine; second creeping rotating speed N<TCU> sent by the transmission control unit is acquired if the whole automobile condition meets a creeping interaction control condition; the lager one of the first creeping rotating speed N<ECU> and the second creeping rotating speed N<TCU> is selected as final target creeping rotating speed; final creeping control torque is determined according to the final target creeping rotating speed and the actual rotating speed of the engine; and coordination control is carried out according to the final creeping control torque. According to the method, cooperation between the creeping control torque of an engine control unit and the torque loads of clutches in the automobile creeping process is optimized, the problem that in the automobile creeping starting process, the rotating speed of the engine is lowered excessively, and even flameout occurs is solved, and driving smoothness in the automobile creeping process is improved.

Description

technical field [0001] The invention relates to the technical field of automobile electrical control, in particular to a creep control method and system for a dual-clutch automatic transmission automobile. Background technique [0002] Dual-clutch automatic transmission combines the advantages of manual transmission and traditional automatic transmission, which not only improves the fuel economy of the vehicle, but also ensures the driving smoothness of gear shifting. With the increasing awareness of energy conservation and environmental protection, the share of dual-clutch automatic transmissions in the automotive automatic transmission market has increased rapidly. [0003] However, at low speeds (that is, before the supercharger is not working), especially at idling conditions, the output torque of the small-displacement engine is relatively small, which makes the dual-clutch automatic transmission creeping process (referring to the car when starting without stepping on t...

AI Technical Summary

Problems solved by technology

[0015] The object of the present invention is to provide a creep interaction control method and system for a dual-clutch automatic transmission vehicle, to optimize the cooperation between the creep control torque of the engine control unit and the clutch torque load when the vehicle creeps, and to solve the problem of excessive drop in engine speed when the vehicle creeps and starts. The problem of too much or even flameout can be improved to improve the driving comfort when the car creeps

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