Arrangement for controlling the pressure reduction by means of a

Details Arrangement for controlling the pressure reduction by means of a Arrangement for controlling the pressure reduction by means of a

1986-06-20

1988-01-12

Reger, Duane A.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303105, 364426, B60T 870

Patent

active

047187360

ABSTRACT:
To modulate the pressure reduction when controlling wheel slip by means of an anti-lock hydraulic brake system, electric signals representative of the rotational behavior of the individual wheels are reconditioned and combined electronically. Upon the occurrence of a tendency to lock, a pressure-reducing valve (17, 17', 19, 19', 21, 21') is actuated pulsewise, and thereby pressure fluid out of the wheel brake cylinder is returned into a supply reservoir (11). When varying the pulse/pulse-pause ratio of the actuating signals (i.sub.AV), additionally the pressure/time characteristic curve of the brake system is taken into consideration by increasing the pulse/pulse-pause ratio after a predetermined period of time, that is time of pressure reduction or number of pulses, with the pressure-reducing signal continuing to exist. The change in the actuating signals (i.sub.AV) for the improvement of the pressure reduction is effected in one or in several steps or quasi-continuously.

REFERENCES:
patent: 3398995 (1968-08-01), Martin
patent: 3806205 (1974-04-01), Hida et al.
patent: 3887240 (1975-06-01), Leiber et al.
patent: 4320459 (1982-03-01), Lindemann et al.
patent: 4466066 (1984-08-01), Saumweber et al.
patent: 4632467 (1986-12-01), Kircher et al.

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