Method and control apparatus for actuating a braking device in the drive train of a vehicle with an automatic transmission
AssigneeAudi AG
InventorsKilian Förster, Dietmar Wohnert
Life of this patent
Estimating the term…
Abstract
A method for activating a braking device in the drive train of a vehicle with an automatic gear box, a gear-side parking brake, and a braking system. The vehicle, starting from a parked position with an engaged parking lock, and under the presence of a starting condition, a control apparatus independent from a driver request, controls the braking system to secure against the vehicle rolling away by until the parking lock is released.
Claims20
A method for activating a braking device in the drive train of a vehicle with an automatic gear box, with a parking lock and at least one braking system,
- securing a parked vehicle having the parking lock in an engaged state against rolling away by at least one of a service brake and an independently operable parking brake;
- releasing the parking brake and disengaging the parking lock of the parked vehicle by a control apparatus in response to a starting condition, wherein the parking lock is only released if the vehicle is secured against rolling away by the service brake;
- raising a brake pressure of the service brake in the event that the brake pressure of the service brake is insufficient at the time of releasing the parking brake to secure the vehicle against rolling away,
- wherein the release of the parking brake and disengagement of the parking lock is only permitted when the brake pressure of the service brake has been reached with which the vehicle is secured against rolling away.
The method according to 8, wherein when the parking condition is met and the service brake is engaged, the control apparatus determines whether the brake pressure of the service brake is set such that the vehicle is secured against rolling away.
A control apparatus for activating a braking device in the drive train of a vehicle, comprising:
- an automatic gear box;
- a parking lock comprising a gear-side parking lock;
- a service brake;
- and
- a parking brake,
- wherein, when a parked vehicle is parked and the parking lock can disengage so long as the vehicle is secured against rolling away by at least one of the service brake and parking brake until the parking lock is released,
- wherein disengagement of the parking lock, starting from the parked vehicle with the parking lock in an engaged state and the parking brake in an engaged state, when loosening the parking brake, the parking brake is only released by the control of the control apparatus if the vehicle is secured from rolling away by means of the service brake,
- wherein the parking brake is released and the parking lock is disengaged by the control apparatus in response to a starting condition, wherein the parking lock is only released if the vehicle is secured against rolling away by the service brake;
- wherein a brake pressure of the service brake is raised in the event that the brake pressure of the service brake is insufficient at the time of releasing the parking brake to secure the vehicle against rolling away,
- wherein the release of the parking brake and the disengagement of the parking lock is only permitted when the brake pressure has been reached with which the vehicle is secured against rolling away.
Dependencies are inferred from the claim text.