Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1988-02-26
1989-03-28
Kashnikow, Andres
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
180197, 188181R, 303 92, 303 96, 303100, 303110, B60T 834, B60K 2816
Patent
active
048157929
ABSTRACT:
In an anti-blocking system for a road vehicle with statically pressure-actuatable brake circuits, a pressure modulator with an outlet pressure connected with the wheel brake cylinder is coordinated to each wheel brake, whereby pressure reduction-, pressure build-up and pressure-maintaining-phases of the anti-blocking regulation are attainable by its controllable volume change respectively maintaining constant of its volume. The pressure modulators are constructed as stepped cylinders with bore steps of different diameters passing over one into the other, in which a smaller and a larger control pressure space is movably delimited by piston steps of corresponding different diameters of a stepped piston, as well as the outlet pressure space, which is formed by an annular space remaining between the piston steps. The larger control pressure space is permanently connected with the main brake line of the respective brake circuit. One pressure inlet control valve each is connected between the outlet pressure space of the respective pressure modulator and the main brake line, whose base position is the passage position, and which, for the purpose of the anti-blocking regulation is adapted to be activated into the closing position. A function-control valve is further provided for each wheel brake, by way of which an auxiliary pressure source, also valve-controlled, is adapted to be connected to the smaller control pressure space. The output pressure P.sub.A is higher by a minimum amount, for example, 10 to 30 bar than the maximum output pressure P.sub.B of the brake pressure control apparatus multiplied with the ratio F.sub.1 /F.sub.2 of the areas F.sub.1 and F.sub.2 of the larger piston step and of the smaller piston step.
REFERENCES:
patent: 3972568 (1976-08-01), Fleischer
patent: 4320506 (1982-03-01), Farazi et al.
patent: 4480309 (1984-10-01), Burckhardt et al.
patent: 4511971 (1985-04-01), Dittner et al.
Daimler-Benz Aktiengesellschaft
Graham Matthew C.
Kashnikow Andres
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