Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1990-12-19
1992-05-26
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188181A, 188181C, 303106, 303108, 303110, B60T 832
Patent
active
051161095
ABSTRACT:
The invention is directed to an anti-skid control system for controlling a braking force applied to a road wheel with a hydraulic braking pressure supplied to a wheel brake cylinder through a pressure control valve controlled by an electronic controller. On the basis of a wheel speed of the road wheel detected by a wheel speed sensor, the controller calculates an estimated vehicle speed and sets a reference speed on the basis thereof. In the controller, the wheel speed is compared with the reference speed, and in response to a result of comparison the hydraulic pressure supplied to the wheel brake cylinder is controlled by the pressure control valve. Through an adjustment by the controller, the hydraulic braking pressure is decreased in response to a change of difference between the wheel speed and the estimated vehicle speed for a certain period of time. The controller may be arranged to calculate an integrated value of the difference between the wheel speed and the estimated vehicle speed, to compare a value which is obtained by subtracting the integrated value from the wheel speed, with the reference speed, and to decrease the hydraulic pressure in the wheel brake cylinder in response to the result of comparison.
REFERENCES:
patent: 4912744 (1990-03-01), Hurst
patent: 5015041 (1991-05-01), Kuwana et al.
patent: 5021957 (1991-06-01), Yoshiho et al.
Ichikawa Hiroyuki
Itabashi Satoshi
Kamikado Masaru
Kuwana Kazutaka
Okamoto Kuniaki
Aisin Seiki Kaibshiki Kaisha
Butler Douglas C.
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