US 6,082,834 A · Circuit arrangement for a brake system with anti-lock control and traction slip control

Abstract

A circuit arrangement for a brake system having anti-lock control (ABS) and traction slip control by brake management (BASR) which has an electromotively driven hydraulic pump for the auxiliary pressure supply in the ABS mode and BASR mode, sensors to determine the wheel rotational behavior, and an electronic circuit for analyzing the sensor signals and generating braking pressure control signals. The hydraulic pump, in the BASR mode, is activated by a pulse train (at least temporarily), and the flow rate of the pump is adjusted to the requirements by modulating the pulse train, the requirements being determined by analyzing the traction slip and the instantaneous rotational speed of the hydraulic pump. Pulse patterns in the form of pulse trains with predetermined pulse times and times of pulse break serve to activate the pump.

Claims19

Dependent claims

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.

3 more elements

A circuit arrangement for a hydraulic brake system of a vehicle having anti-lock control and traction slip control by brake management, said circuit arrangement comprising:

means for developing indications of the rotation behavior of the wheels of a vehicle having driven wheels;
an electromotively driven hydraulic pump which operates in:
(1) a first mode of operation for supplying auxiliary pressure during anti-lock control;
and (2) a second mode of operation for supplying braking pressure during traction slip control by brake management of the vehicle, wherein a lower amount of hydraulic pressure is needed during said second mode of operation than during said first mode of operation;
and
electronic circuit means for:
(a) analyzing the wheel rotation behavior indications, and
(b) developing braking pressure controls and auxiliary pressure controls;
said electronic circuit means including:
(a) means for determining the traction slip of the driven wheels of the vehicle and the instantaneous rotational speed of said hydraulic pump;
(b) a source of timing signals for regulating activation of said hydraulic pump;
and
(c) means for:
(1) analyzing the traction slip of the driven wheels and the instantaneous rotational speed of said hydraulic pump;
and
(2) selecting, in response to analyzing the combination of:
(a) the analysis of the traction slip of the driven wheels and (b) the instantaneous rotational speed of said hydraulic pump, timing signals to at least temporarily activate said hydraulic pump in said second mode of operation during traction slip control by brake management to limit the flow rate of said hydraulic pump to a value at which said lower amount of hydraulic pressure is met, whereby noise developed from said hydraulic pump is minimized.

14 more elements

A circuit arrangement for a hydraulic brake system of a vehicle having anti-lock control and traction slip control by brake management, said circuit arrangement comprising:

means for developing indications of the rotation behavior of the wheels of a vehicle having driven wheels;
an electromotively driven hydraulic pump which operates in:
(1) a first mode of operation for supplying auxiliary pressure during anti-lock control;
and (2) a second mode of operation for supplying braking pressure during traction slip control by brake management of the vehicle, wherein a lower amount of hydraulic pressure is needed during said second mode of operation than during said first mode of operation;
and
electronic circuit means for:
(a) analyzing the wheel rotation behavior indications, and
(b) developing braking pressure controls and auxiliary pressure controls;
said electronic circuit means including:
(a) means for determining the traction slip of the driven wheels of the vehicle, including means for determining whether said traction slip is above or below a traction slip threshold, and means for determining the instantaneous rotational speed of said hydraulic pump, including means for determining whether said instantaneous speed is above or below a pump speed threshold,
(b) a source of timing signals for regulating activation of said hydraulic pump;
and
(c) means for:
(1) analyzing the traction slip of the driven wheels and the instantaneous rotational speed of said hydraulic pump;
and
(2) selecting, in response to analyzing the combination of:
(a) the analysis of the traction slip of the driven wheels and (b) the instantaneous rotational speed of said hydraulic pump, timing signals to at least temporarily activate said hydraulic pump in said second mode of operation during traction slip control by brake management to limit the flow rate of said hydraulic pump to a value at which said lower amount of hydraulic pressure is met, whereby noise developed from said hydraulic pump is minimized.

14 more elements

Dependencies are inferred from the claim text.

Circuit arrangement for a brake system with anti-lock control and traction slip control

Life of this patent

Circuit arrangement for a brake system with anti-lock control and traction slip control

Life of this patent

Abstract

Claims19