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
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303100, 303119, 303115, 180197, B60T 832, B60T 840, B60T 1310, G05D 1300
Patent
active
049040286
ABSTRACT:
In a brake pressure setting device suitable for both an antilocking control system and a drive slip control system, a pressure modulator unit designed as a stepped cylinder is provided with a modulation chamber which can be connected to the main brake pipe of the brake circuit of the driven vehicle wheels and a control pressure space separated from the modulation chamber by the modulator piston. The control pressure space can be connected to a pressure outlet of an auxiliary pressure source or alternatively to its non-pressurized sump tank. The modulator piston is urged by a return spring into a position corresponding to maximum volume of the modulation chamber. Connecting the control pressure space to the pressure outlet of auxiliary pressure source moves the piston into an end position corresponding to a minimum volume of the modulation chamber. Controllable piston displacements can, with the interaction of the brake pressure control valves of the antilocking system, control brake pressure reduction and brake pressure build-up phases of antilocking and drive slip control in any given order. The modulator piston is continuously held in an intermediate position, from which the control can take place in the particular control direction necessary. A position indicator is provided for monitoring the initial position of the modulator piston. In addition, a mechanically controlled valve is provided which, after the modulator piston has executed a small fraction of its stroke in the direction which reduces the volume of the modulation chamber, moves into its functional position shutting off the modulation chamber from the outlet pressure space of the brake unit.
REFERENCES:
patent: 4815792 (1989-03-01), Troster
patent: 4824185 (1989-04-01), Leiber et al.
patent: 4836617 (1989-06-01), Resch
Leiber Heinz
Steiner Manfred
Butler Douglas C.
Daimler-Benz AG
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