Patent ID: 6361126
Filing Date: 2002-03-26
Classification: B60T

Abstract:
A brake pressure control device, comprising:a pneumatic brake booster including at least two chambers that are separable from each other, at least one of the chambers being operated as a low-pressure chamber, and at least another one of the chambers being operated as a working chamber; a master braking cylinder in which a master cylinder pressure is generated using the pneumatic brake booster; and a hydraulic unit installed between the master braking cylinder and at least one wheel brake cylinder of at least one wheel, the hydraulic unit including switchable valves and at least one pump, a hydraulic boost of a brake pressure being achievable with the assistance of the hydraulic unit, a wheel brake cylinder pressure being generated in the at least one wheel brake cylinder with the assistance of the hydraulic unit, the wheel brake pressure being greater than the master cylinder pressure, a drive trigger point at which the hydraulic unit is at least one of activated and deactivated for boosting the brake pressure being determined as a function of a time derivation of the master cylinder pressure and of a differential pressure between at least one of a pressure in the low-pressure chamber and the working chamber, on the one hand, and an ambient pressure on the other hand.