Zf Friedrichshafen Ag

Bernd Zaenglein

Klaus Steinhauser

Walter Hecht

Frank Worms

Stephane Klein

A method for shifting an automatic or an automated transmission of a motor vehicle to a 'neutral' position such that the shift position of the transmission and a parking lock, provided for keeping the motor vehicle stationary, are engaged as a function of a shift position selected with a driver operated selector device and as a function of other operating parameters of the motor vehicle. A holding phase, in which the transmission is in the neutral position, free from friction force locking, can be activated by a separate operating device which is provided, in addition to the selector device, but only when the motor vehicle is simultaneously at least approximately stationary, an ignition current circuit that acts on a drive engine of the motor vehicle is electrically interrupted, and the 'neutral' (N) shift position is specified by a selector device.

Method for actuating the neutral position in an automatic or automated transmission of a motor vehicle, and corresponding motor vehicle

A method of actuating a gear step in an automatic or automated transmission of a motor vehicle. The gear step of the transmission and a parking lock, which immobilizes the vehicle, can be engaged as a function of a gear step (P, R, N, D) that can be selected by the driver via a controllable selector device, and as a function of other motor vehicle operating parameters. A separate operating device, which is in addition to the selector device, can activate a holding phase, in which the transmission is in a traction-free neutral position, independently of a predetermined gear step 'Park' (P), 'Reverse' (R), &#x201c;Neutral&#x201d; (N) and/or &#x201c;Forward&#x201d; (D) that is specified by the selector device, if the motor vehicle is at least almost at a standstill and at the same time, an ignition circuit acting on a drive motor of the motor vehicle is electrically interrupted.

Growing community of inventors

Friedrichshafen, Germany

Bernd Zaenglein