Patent ID: 8038228
Filing Date: 2011-10-18
Classification: B60T

Abstract:
1. A method for controlling the pressure buildup in an electronically controllable automotive brake system, where the brake system includes a tandem master brake cylinder, a vacuum brake booster, and at least one additional pressure source for brake force assistance, which is drivable by a controlling unit and the pressure of which can be applied to wheel brakes of the vehicle, the method comprising the steps of detecting an approach of an operating point defined by a minimum predetermined ratio between the auxiliary force of the vacuum brake booster and the actuating force, detecting a pressure gradient in the master brake cylinder, and, in the event of a detected approach of the operating point of the vacuum brake booster and when a pressure gradient limit value of the detected master brake cylinder pressure gradient is exceeded, lowering the operating point of the vacuum booster by a predetermined operating point-reduction pressure value when an approach of the operating point of the vacuum brake booster is detected and the pressure gradient limit value of the established master brake cylinder pressure gradient is exceeded, and thus establishing a corrected operating point, replacing the operating point, which corrected operating point causes activation of the additional pressure source for the purpose of building up additional brake pressure.