Method of controlling the brake pressure in an anti-lock vehicle

Details Method of controlling the brake pressure in an anti-lock vehicle Method of controlling the brake pressure in an anti-lock vehicle

1989-02-21

1990-07-03

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

188181C, 303 97, 303105, 36442602, B60T 832, B60T 866

Patent

active

049385445

ABSTRACT:
In an anti-lock vehicle braking system the brake pressure acting at the controlled wheel is controlled in such a manner that the threshold value with respect to the rotational retardation of the wheel at the beginning of a lowering or raising of pressure is increased briefly, during a control cycle, by a constant amount (S.sub.H -S.sub.G) with respect to a threshold base value (S.sub.G) in order to avoid any undesired control operations caused especially by axle vibrations, pot holes, and the like. The threshold value is then decreased in response to the period of time of the pressure reduction in the preceding control cycle. The decreasing of the threshold value is carried on to values S.sub.T below the threshold base value and maintained for a given time interval (t.sub.x -t.sub.y).

REFERENCES:
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patent: 4701855 (1987-10-01), Fennel
patent: 4797825 (1989-01-01), Shimanuki et al.
patent: 4807133 (1989-02-01), Shimanuki et al.
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"Bosch Technische Berichte", (English Special Edition), Bosch, 2-1982.
"ATZ Automobiltechnische Zeitschrift", 74 (1972) 7, pp. 277-282.

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