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1. (WO2013159896) METHOD FOR OPERATING A DRIVE TRAIN OF A MOTOR VEHICLE HAVING A FREEWHEELING ENGINE-OFF FUNCTION, CONTROL DEVICE AND MOTOR VEHICLE

Pub. No.:    WO/2013/159896    International Application No.:    PCT/EP2013/001193
Publication Date: Fri Nov 01 00:59:59 CET 2013 International Filing Date: Tue Apr 23 01:59:59 CEST 2013
IPC: B60W 30/18
B60W 10/06
B60W 10/10
B60W 10/113
Applicants: AUDI AG
Inventors: SCHIERGL, Andreas
Title: METHOD FOR OPERATING A DRIVE TRAIN OF A MOTOR VEHICLE HAVING A FREEWHEELING ENGINE-OFF FUNCTION, CONTROL DEVICE AND MOTOR VEHICLE
Abstract:
The invention relates to a method for operating a drive train of a motor vehicle with an internal combustion engine, automatic transmission and at least one drive axle, wherein in order to save fuel during the driving mode when the accelerator pedal is not activated a clutch device which is associated with the automatic transmission is opened and subsequently the internal combustion engine is shut down. There is provision that when the accelerator pedal is activated again the internal combustion engine is started and in the automatic transmission the highest possible gear speed for the reconnection is firstly selected and so that the revving up time of the engine rotational speed is as short as possible, with the result that the necessary drive torque which is generated by the internal combustion engine can be made available at the drive axle as quickly as possible. The invention also relates to a control device for carrying out this method and to a motor vehicle having such a control device.