Fluid-pressure and analogous brake systems – Speed-controlled – With failure responsive means
Patent
1996-08-22
1999-05-11
Poon, Peter M.
Fluid-pressure and analogous brake systems
Speed-controlled
With failure responsive means
30312211, B60T8/94
Patent
active
059020202
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a hydraulic brake system with slip control, in particular for multiple-axle automotive vehicles employing a single brake circuit.
BACKGROUND OF THE INVENTION
Previously, hydraulic brake systems with slip control have exclusively been conceived as multi-circuit, preferably dual-circuit, brake systems. A satisfactory deceleration of the vehicle, which is in conformity with legal regulations for brake systems, is achieved due to the given redundance of brake circuits in the event of brake circuit leakage. In this respect, reference is made to the source of literature "BOSCH Technische Unterrichtung" (technical instructions), automotive vehicle brake systems, Robert Bosch GmbH, first edition of September 1989.
Although legal regulations for passenger vehicles in Europe and the U.S. so far do not mandate the provision of multiple circuits in brake systems, multiple circuit systems are the norm. A multiple-circuit brake system is relatively complicated and expensive, especially with respect to an application for anti-lock and/or traction slip control. Further, the complexity of such hydraulic brake systems with slip control involves a great number of possible malfunctions, which should not be underestimated. Such malfunctions are mainly due to leakages of the pump, the braking pressure generator and the pressure modulation valves.
SUMMARY OF THE INVENTION
An object of the present invention is to equip the previously known hydraulic brake system with slip control with a monitoring device which checks the brake system for leakage at component locations which are particularly susceptible to leakage, and, by detecting existing malfunctions of the brake system, enables a vehicle deceleration which satisfies legal regulations. Simple measures are employed for monitoring and for operation of the brake system.
According to the present invention, the pressure fluid connection between the braking pressure generator and all wheel brakes, for simplification of the construction, is established exclusively by a branched brake line, to which the pump is connected, and into which a multi-way valve and a monitoring device including a pressure sensor is inserted to sense the pressure prevailing at the pressure modulation valves of the wheel brakes. The proposed monitoring device permits the early detection of leakages, and a structurally simple and functionally reliable brake system is achieved by using only one brake circuit in conjunction with the monitoring device.
The features, advantages and possible applications of the present invention will be explained hereinbelow by making reference to the description of an embodiment as in FIG. 1.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the hydraulic and wiring schematic diagram of a slip-controlled brake system.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
Reference numeral 1 designates a braking pressure generator which includes a master cylinder to which a vacuum booster is flanged. A brake line 3 is connected to the master cylinder of braking pressure generator 1. Brake line 3 includes a multi-way valve 5 and has a pump 4 and pressure modulation valves 7,7' inserted into the pressure fluid branch lines of brake line 3. The pressure modulation valves 7,7' associated with wheel brakes 2 take the form of pressure modulation valves 7,7' associated with wheel brakes 2 take the form of two-way/two-position directional control valves in the proposed embodiment. Other switching variants such as three-way/two-position directional control valves or three-way/three-position directional control valves arc possible, as requested or needed, depending on the pressure gradient variation desired.
The wheel brakes 2 of the rear axle (HL and HR) are jointly controlled by way of a pair of pressure modulation valves 7,7', and the wheel brakes 2 of the front axle (FL and FR) are controlled individually on each wheel by way of corresponding pressure modulation valves 7,7'. Control channel split-up variants are possible but not t
REFERENCES:
patent: 3514160 (1970-05-01), Lieber
patent: 5558415 (1996-09-01), Buschmann et al.
ITT Automotive Europe GmbH
Poon Peter M.
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