Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1989-04-17
1990-08-14
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303100, 303110, 303116, 303119, B60T 832, B60T 840, B60T 1310, G05D 1300
Patent
active
049482009
ABSTRACT:
A brake pressure setting device suitable for both an antilocking control system and drive slip control system is provided and uses a pressure modulator designed as a stepped cylinder defining 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 a modulator piston. The control pressure space anc be connected to a pressure outlet of an auxiliary pressure source of alternatively to its non-pressurized sump tank for driving the pistion. A return spring biases the piston into a position associated with maximum volume of the modulation chamber. Connecting the control pressure space to the pressure outlet of the auxiliary pressure source moves the modulator piston into an end position provided for normal brake operation and suitable as an initial position for antilocking control system operation. If a spin tendency appears on a driven viehicle wheel, the modulator piston is brought, as a preparatory measure, into an end position associated with maximum volume of the modulation chamber, so that brake fluid flows from the brake unit into the modulation chamber. In order to activate the drive slip control system, the modulation chamber is shut off from the brake unit and the control pressure space is connected to the high pressure outlet of the auxiliary pressure source. The selection of the wheel to be sujected to the control is made by the brake pressure control valves provided for the antilocking control system.
REFERENCES:
patent: 3480335 (1969-11-01), Inada
patent: 3807810 (1974-04-01), Yarber
patent: 3981545 (1976-09-01), Eddy
patent: 4175794 (1979-11-01), Pauwels
patent: 4726549 (1988-02-01), Dittner et al.
patent: 4807943 (1989-02-01), Ogino
patent: 4835695 (1989-05-01), Walenty et al.
patent: 4836617 (1989-06-01), Resch
Leiber Heinz
Steiner Manfred
Butler Douglas C.
Daimler-Benz Aktiengesellschaft
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