Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1986-10-02
1988-05-24
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
180244, 180245, 180248, 188181R, 303114, 303119, 303 96, B60T 826, B60T 832
Patent
active
047461730
ABSTRACT:
A slip-controlled hydraulic brake system for all-wheel driven motor vehicles equipped with lockable differentials (2, 3) is provided with sensors (S.sub.1 -S.sub.4, 33-36) for measuring the rotational behavior of the wheels. Electronic circuits (44) are provided for logic combining and processing the sensor signals, and for generating braking pressure control signals by way of which the brake pressure in the individual wheel brakes (16-19) is variable in response to the rotational behavior of the wheels and to a reference variable. To compensate the increased moments of inertia as a result of the moments transmission, by way of the lockable differentials (2, 3) in this brake system the brake pressure in the rear-wheel brakes (18, 19), can be modulated at a lower control frequency as compared with the brake pressure in the front-wheel brakes (16, 17). The reduction in the control frequency of the rear-wheel brake pressure is determined by driving-dynamic criteria, for example, by the average motor vehicle deceleration or by the motor vehicle speed.
REFERENCES:
patent: 3463555 (1969-08-01), Ryskamp
patent: 3519314 (1970-07-01), Ballard
patent: 4361871 (1982-11-01), Miller et al.
patent: 4538700 (1985-09-01), Suzuki
patent: 4552241 (1985-11-01), Suzuki
patent: 4585280 (1986-04-01), Leiber
patent: 4589511 (1986-05-01), Leiber
DE-Z, Bosch: Technische Berichte, Antiblockierregel Systeme, 1980.
DE-Z, ATZ 9, 1985, S. 395.
Buschmann Gunther
Ehmer Norber
Fennel Helmut
Wupper Hans
Alfred Teves GmbH
Butler Douglas C.
Raden James B.
Seitter Robert P.
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