Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1989-04-17
1990-02-27
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 92, B60T 840
Patent
active
049040294
ABSTRACT:
For a road vehicle with front axle/rear axle brake circuit subdivision, in which the rear axle brake circuit is designed as a static brake circuit with an antilocking system operating on the pump-back principle providing brake pressure control according to the select-low principle and in which the return pump is designed as a hydraulically driven piston pump whose valve chamber is connected via an inlet non-return valve to the section of the main brake pipe of the rear axle brake circuit branching off to the rear wheel brakes and, via an outlet non-return valve, to the pressure outlet of the main brake unit associated with the rear axle brake circuit. The section of the main brake pipe extending between the connection positions of the two non-return valves can be shut off by means of a single brake pressure control valve designed as a 2/2-way solenoid valve. The control of the brake pressure reduction and pump-back strokes of the pump piston is provided by a drive control valve designed as a 3/2-way solenoid valve whose basic position connects the drive pressure space of the return pump to the high pressure output of an auxiliary pressure source and whose activated position relieves the drive pressure space of the return pump to a non-pressurized sump tank of the auxiliary pressure source.
REFERENCES:
patent: 4779935 (1988-10-01), Kuwana et al.
patent: 4790608 (1988-12-01), Burgdorf et al.
patent: 4805967 (1989-02-01), Arikawa
Bosch Technische Berichte, vol. 7, No. 2, pp. 86-87.
Leiber Heinz
Steiner Manfred
Daimler-Benz AG
Reger Duane A.
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