Zf Friedrichshafen Ag

Frank Worms

Klaus Steinhauser

Walter Hecht

Armin Gierling

Bernd Zänglein

Stéphane Klein

Stephane Klein

Bernd Zaenglein

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.

Method for actuating a gear step in an automatic or automated transmission of a motor vehicle and corresponding motor vehicle

A method of automatically controlling a neutral position and parking lock of an motor-vehicle transmission to immobilize the vehicle depending on a drive position of the transmission selected by the driver with a selector device and subject to other operating parameters of the motor vehicle. Only when simultaneously the vehicle is essentially stationary, an ignition circuit is electrically interrupted and the selector device is in a 'Neutral' position, can an Neutral-holding phase be activated, in which the transmission is in a non-frictionally engaged neutral position as long as the parking lock of the transmission has not yet been engaged. If the Neutral-holding phase has not been activated, the transmission remains non-frictionally connected in the Neutral position until the driver at least intends to exit the vehicle, at which time the parking lock of the transmission is automatically engaged.

Method for automatically controlling a neutral position and a parking lock of a motor vehicle transmission

A method of selecting a neutral position of an automatic or automated transmission and a parking gear to immobilize a motor vehicle. The neutral position and parking device can be set or activated, depending on a gear selected by the driver with a selector device and depending on other vehicle operating parameters. Only when the motor vehicle is at least substantially stationary, an ignition circuit acting on the drive motor vehicle is electrically interrupted and a 'Neutral' (N) gear is selected by a selector device occur simultaneously, can an N-holding phase, in which the transmission is in a friction-free neutral position, be activated by a separate control device provided in addition to the selector device, as long as an energy management system of the motor vehicle allows activation of the N-holding phase.

Method for selecting a neutral position of a motor vehicle transmission and for selecting a parking gear of a motor vehicle

The invention concerns a method for the automatic control of a neutral position and a parking lock of an automatic or automated motor vehicle transmission, such that the neutral position and the parking lock of the transmission provided in order to immobilize the motor vehicle can be engaged as a function of a drive setting selected by the driver of the motor vehicle using a selector device, and as a function of other operating parameters of the vehicle. In addition, the invention concerns a motor vehicle controlled by the method. It is proposed that a N-holding phase in which the transmission is in a friction-force-free neutral position can be activated by way of a separate operating device provided in addition to the selector device, only when the motor vehicle is at least almost at rest and at the same time an ignition circuit that acts upon a drive motor of the motor vehicle is electrically interrupted, and at the same time a drive setting 'Neutral' (N) is set by way of a selector device, and so long as the parking lock of the transmission has not yet been engaged.

Method for the automatic control of a neutral position and a parking lock of a motor vehicle transmission

A method for selecting a neutral position of a transmission and for selecting a parking device intended for immobilizing a vehicle, wherein the neutral position and the parking device can be engaged or actuated as a function of a position chosen by the driver on a selector device and as a function of other vehicle operating parameters. It is proposed that only if the vehicle has come approximately to a stop and simultaneously an ignition circuit acting on a driving motor of the vehicle is electrically interrupted and simultaneously a 'Neutral' position is specified by way of the selector device, an N-holding phase, in which the transmission is in a neutral position having no frictional connection, can be activated by way of a separate control device provided in addition to the selector device, as long as an energy management system of the motor vehicle allows the activation of the N-holding phase.

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Langenargen, Germany

Frank Worms