Method for automatically engaging a parking lock of an automatic or automated gearbox of a motor vehicle
AssigneeZF Friedrichshafen AG
InventorsArmin Gierling, Walter Hecht
Life of this patent
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Abstract
A method of automatically engaging a parking lock or an automatic or automated gearbox of a motor vehicle, which can be engaged depending on a drive position selected by the driver of the motor vehicle, by way of a selector device and depending on other operating parameters. In order to achieve as little restriction of the drivability of the motor vehicle as possible, without neglecting the safety of the driver and surroundings, two different complex embodiments of an Auto_P function for automatically engaging the parking lock are proposed, if the motor vehicle is at least approximately stopped and, at the same time, an ignition circuit acting on the drive motor of the motor vehicle is electrically interrupted.
Claims6
A method for automatically engaging a parking lock of one of an automatic or an automated gearbox of a motor vehicle that can be engaged depending on a drive position (P, R, N, D) selected by a driver of the motor vehicle by way of a selector device, and depending on other operating parameters of the motor vehicle, the method comprising the steps of:
- one of retaining engagement of or automatically engaging a drive position of “Neutral” (N) in the gearbox, IF a detected current speed (v_Fzg) of the motor vehicle is lower than a predefined low threshold value, AND simultaneously both an ignition circuit of the motor vehicle that acts on a drive motor of the motor vehicle is electrically interrupted, AND a drive position of “Neutral” (N) is selected by way of the selector device;
- AND automatically engaging the parking lock of the gearbox, IF the current speed (v_Fzg) of the motor vehicle is lower than the predefined low threshold value, AND simultaneously both the ignition circuit is electrically interrupted, AND a one of drive position of “Drive” (D) or “Reverse” (R) is selected;
- AND one of retaining engagement of or automatically engaging the parking lock of the gearbox, IF the current speed (v_Fzg) of the motor vehicle is lower than the predefined low threshold value, AND simultaneously both the ignition circuit is electrically interrupted, AND a drive position of “Park” (P) is selected by way of the selector device.
Dependencies are inferred from the claim text.