Patent ID: 6648423
Filing Date: 2003-11-18
Classification: B60T

Abstract:
Hydraulic brake system for controlled and comfortable braking operations by a cruise control system, comprising:a hydraulic pump for build-up of a hydraulic pressure that effects braking, and a valve assembly in which the hydraulic pressure can be reduced or increased without use of a brake pedal, wherein the valve assembly is configured as an analog valve, wherein an inlet of the analog valve is connected to an outlet of the hydraulic pump, and a first outlet of the analog valve is connected to a wheel brake and a second outlet of the analog valve is connected to a low-pressure side of the brake system, and wherein the analog valve and the hydraulic pump are coupled to and actuated by a control device such that the hydraulic pressure for comfortable braking can be increased or decreased in an essentially continuously variable manner without use of the brake pedal by the cruise control system, wherein the analog valve is interposed between a pressure side of the hydraulic pump and a low-pressure side of the brake system, and the analog valve is opened in steps by the control device for brake pressure reduction, and wherein a suction side of the hydraulic pump is connectable to a hydraulic supply reservoir by way of a first separating valve, and the analog valve can be closed and the first separating valve opened by the control device for brake pressure increase.