Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1993-12-02
1995-02-21
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 10, 3031162, B60T 1314
Patent
active
053909941
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a hydraulic brake system with anti-lock and drive-slip control device as set forth hereinafter.
Such a brake system has already been proposed (EP-A-0 482 379) in which the shut-off valve in the induction conduit has a spring-actuated shut-off position as its basic position and a through-flow position, which can be selected electromagnetically. This shut-off valve is provided for the induction control of the high-pressure pump, i.e. the valve only releases the connection to the main brake cylinder in drive-slip control operation when the high-pressure pump is to supply a pressure medium.
Furthermore, a brake system has already been proposed (EP-A-0 464 375) in which the high-pressure pump is connected to a pressure medium storage container of the main brake cylinder by a suction conduit. A shut-off valve is arranged in the induction conduit at the suction end of the pump and this shut-off valve takes up its through-flow position under spring actuation and can be switched into its shut-off position by the main brake cylinder pressure.
ADVANTAGES OF THE INVENTION
The hydraulic brake system according to the invention has, in contrast, the advantage that the substitution of hydraulic actuation for electromagnetic actuation of control unit. Furthermore, a relatively large flow cross-section can be achieved with simple means in the case of a hydraulically actuated shut-off valve. At low temperatures, this reduces the throttling effect of the valve when inducing pressure medium from the main brake cylinder.
An advantageous further development of the brake system given herein is possible by means of the measure quoted hereinafter. A particular advantage of this is the fact that a low-pressure reservoir chamber which is partially filled after an anti-lock operation or a drive-slip control operation can be emptied automatically into the main brake cylinder via the non-return valve and the second shut-off valve, which takes up its through-flow position, after the brake pedal has been released.
DRAWING
An embodiment example of the invention is explained in more detail in the following description using a circuit diagram of a hydraulic brake system shown in the drawing.
DESCRIPTION OF THE EMBODIMENT EXAMPLE
The hydraulic brake system 1 shown in the drawing is intended for use in motor vehicles, in particular passenger cars.
The brake system 1 has a two-circuit main brake cylinder 3, which can be actuated by a brake pedal 2 and has a pressure medium storage container 4. A first brake circuit I of the brake system 1 is associated with wheel brakes 4, 5 of non-driven vehicle wheels of, for example, the front axle of the vehicle. The wheel brakes 6, 7 of driven vehicle wheels of, for example, the rear axle of the vehicle are connected to a second brake circuit II. The brake system 1 therefore has the so-called TT brake circuit distribution. The brake circuit II associated with the solution according to the invention is explained in more detail below:
The brake circuit II has a brake conduit 10 which, starting from the main brake cylinder 3, leads to the wheel brake 6. A brake conduit 11 branches off from this brake conduit 10 to the second wheel brake 7 of this brake circuit II. A first shut-off valve 12 in the form of a 2/2-way valve with a spring-actuated through-flow position 12a and a shut-off position 12b, which can be selected electromagnetically, is arranged in the brake conduit 10 at the main brake cylinder end. Valve arrangements 13, 14 for the brake pressure modulation in the wheel brakes 6, 7 are provided at the wheel brake end. Each valve arrangement 13, 14 has an inlet valve 15, which is arranged in the corresponding brake conduit 10, 11 and controls the supply of pressure medium to the wheel brake 6, 7. This inlet valve 15 is configured as a 2/2-way valve with a spring-actuated through-flow position 15a and a shut-off position 15b, which can be selected electromagnetically. A respective return conduit 16, 17 starts from the associated brake conduit 10, 11 between t
REFERENCES:
patent: 4900102 (1990-02-01), Jonner et al.
patent: 5131730 (1992-07-01), Kollers et al.
patent: 5169214 (1992-12-01), Holzmann et al.
patent: 5188435 (1993-02-01), Willmann
patent: 5188437 (1993-02-01), Willmann
patent: 5207487 (1993-05-01), Holzmann et al.
Bernhardt Wolfgang
Jonner Wolf-Dieter
Pueschel Helmut
Schmidt Guenther
Greigg Edwin E.
Greigg Ronald E.
Muratori Alfred
Oberleitner Robert J.
Robert & Bosch GmbH
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