Pressure modulator arrangement for a boosting of brake force and

Details Pressure modulator arrangement for a boosting of brake force and Pressure modulator arrangement for a boosting of brake force and

1986-04-02

1988-03-01

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303 10, 303116, 303119, 303115, B60T 844, B60T 1718

Patent

active

047281553

ABSTRACT:
A modulator for a vehicle with a power-assisted hydraulic multiple-circuit brake system, providing an output pressure to a static brake circuit that is proportional to the sum of the forces affecting a pressure modulator piston. These forces include a pedal pressure from the brake-pressure control device to a first driving pressure space of the modulator and booster pressure from the pressure of a proportional control valve to a second driving pressure space of the modulator, which shifts the modulator piston to decrease the output pressure space. Forces produced by auxiliary pressure in a counterpressure space shifts the modulator piston to enlarge the output pressure space. A control valve arrangement disconnects the second driving pressure space from the booster pressure and instead relieves pressure of the second driving pressure space in pressure-reduction phases of the antilock control. The pressure reduction control takes place by the control valve coupling of the output pressure of the auxiliary pressure source into a counterpressure space, thereby shifting the modulator piston in the sense of a volume expansion of its output pressure space and as a result, reducing the pressure in the wheel brake.

REFERENCES:
patent: 3503655 (1970-03-01), Heimler
patent: 3640067 (1972-02-01), Ingram
patent: 3768874 (1973-10-01), Riordan
patent: 4438629 (1984-03-01), Sato et al.
patent: 4492413 (1985-01-01), Belart et al.
patent: 4629258 (1986-12-01), Resch et al.
patent: 4634190 (1987-01-01), Wupper
"Anti-Blockier-System", Feb. 1983, by Honda Deutschland GmbH, pp. 1-5.

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