Patent ID: 8271172
Filing Date: 2012-09-18
Classification: B60T

Abstract:
1. A hydraulic brake system for a land vehicle comprising: a control unit (ECU) that supplies control signals for controlling automatic braking operations of the brake system, a master cylinder that has an output side for generating brake pressure under control of a driver, and a first brake circuit (I) including: a first controllable pump that has an output side for generating brake pressure in the first brake circuit (I) under control of the control unit (ECU), and a first valve arrangement having an input side that is fluidically connected to the output side of the master cylinder and an output side that is fluidically connected to the output side of the first pump, wherein the first valve arrangement has an open operating state, in which the input side and the output side of the first valve arrangement are fluidically connected, and a closed operating state, in which the fluid connection between the input side and the output side of the first valve arrangement is blocked, wherein the control unit (ECU) is devised such that during an automatic braking operation, it supplies first control signals for the first valve arrangement in order to bring the first valve arrangement in such a way into its open and closed operating states that a predetermined pressure is adjusted at the output side of the first valve arrangement, characterized in that the control unit (ECU) is devised to provide second high-frequency control signals for the first valve arrangement, the first control signals and the second control signals superimposing each other.