Patent ID: 6082834
Filing Date: 2000-07-04
Classification: B60T,F04B

Abstract:
A circuit arrangement for a hydraulic brake system including; anti-lock control and traction slip control by brake management; an electromotively driven hydraulic pump which operates in: (1) a first mode of operation for auxiliary pressure supply during anti-lock control; and (2) a second mode of operation for supplying braking pressure during traction slip control by brake management, wherein a lower amount of hydraulic pressure is needed during said second mode of operation than during said first mode of operation; sensors to determine the wheel rotational behavior; and an electronic circuit for analyzing the sensor signals and generating braking pressure control signals and auxiliary pressure control signals, wherein the hydraulic pump, in said second mode of operation during traction slip control by brake management, is activated by a pulse train at least temporarily, and the flow rate of the pump is adjusted by modulation of the pulse train and limited to a value at which said lower amount of hydraulic pressure is met, wherein said flow rate is determined by analyzing the combination of (1) the traction slip of the driven wheels and (2) the instantaneous rotational speed of the hydraulic pump, whereby noise developed from the pump is minimized.