Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1989-04-28
1990-05-01
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 601, 303102, 303103, 303116, B60T 858
Patent
active
049213121
ABSTRACT:
An anti-lock system for vehicle brakes of the type wherein a computer is used to process data received from wheel speed transducers and to control the release of the brake of a particular wheel when the deceleration and/or slip of that wheel exceeds predetermined thresholds. In order to increase the immunity of the system to road irregularities while maintaining skid detection sensitivity, it is arranged that, during periods that anti-lock is not currently evoked, the detection of a road bump at the front axle is used to cause the rear axle anti-lock system to be temporarily de-sensitized just before it would be expected, on the basis of speed and wheel-base, to reach the same bump. Bump recognition at the front wheel(s) is achieved by identifying those occasions when front wheel speed deviation exceeds a predetermined "window" threshold level which is chosen to correspond to the bump severity needed to overcome the normal rear axle "first cycle" threshold but which does not meet the criteria needed to evoke the front axle anti-lock system.
REFERENCES:
patent: 4251118 (1981-02-01), Rothen et al.
patent: 4414630 (1983-11-01), Harris et al.
patent: 4701855 (1987-10-01), Fennel
Butler Douglas C.
Lucas Industries Public Limited Company
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