Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1986-10-02
1988-04-12
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
364426, B60T 866
Patent
active
047369949
ABSTRACT:
To control the braking pressure in the wheel brakes of a slip-controlled hydraulic brake system for automotive vehicles with all-wheel drive and with lockable or automatically locking differentials (2, 3), a circuit configuration is provided which influences the variation of the vehicle reference speed (v.sub.REF). This is to say, in the event of the wheel (v.sub.Rn) which is momentarily decisive for the formation of references becoming instable, the reference speed (v.sub.REF) will first be declined with a relatively flat gradient which corresponds to a vehicle deceleration at a low frictional coefficient. A decrease of the vehicle reference speed (v.sub.REF) with a very steep gradient will follow after a predetermined period of time (T.sub.1). This decrease is continued until the vehicle reference speed (v.sub.REF) reaches the decisive wheel speed again or falls thereunder. To avoid oscillations, the change-over of the reference (v.sub.REF) after the attainment of the wheel speed curves (v.sub.Rn) will not be effected until after a predetermined time of delay (T.sub.2 or T.sub.3).
REFERENCES:
patent: 4439832 (1984-03-01), Sato et al.
patent: 4643485 (1987-02-01), Leiber
patent: 4643492 (1987-02-01), Belart et al.
patent: 4657313 (1987-04-01), Fennel et al.
Buschmann Gunther
Ehmer Norbert
Fennel Helmut
Wupper Hans
Alfred Teves GmbH
Raden James B.
Reger Duane A.
Seitter Robert P.
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