US 9,809,205 B2
Method and control apparatus for actuating a braking device in the drive train of a vehicle with an automatic transmission
Kilian Förster, Beilngries (DE); and Dietmar Wohnert, Ingolstadt (DE)
Assigned to AUDI AG, Ingolstadt (DE)
Appl. No. 15/121,488
Filed by AUDI AG, Ingolstadt (DE)
PCT Filed Feb. 25, 2015, PCT No. PCT/EP2015/000426
§ 371(c)(1), (2) Date Aug. 25, 2016,
PCT Pub. No. WO2015/128082, PCT Pub. Date Sep. 3, 2015.
Claims priority of application No. 10 2014 002 817 (DE), filed on Feb. 26, 2014.
Prior Publication US 2016/0355165 A1, Dec. 8, 2016
Int. Cl. B60W 10/00 (2006.01); B60T 7/12 (2006.01); B60T 1/00 (2006.01); F16H 63/48 (2006.01)
CPC B60T 7/122 (2013.01) [B60T 1/005 (2013.01); B60T 2201/06 (2013.01); F16H 63/486 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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.