Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1988-06-28
1990-12-25
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 96, 303100, B60T 832
Patent
active
049797840
ABSTRACT:
An anti-skid control apparatus for a vehicle includes fluid pressure control valve devices arranged between a tandem master cylinder and the front wheels of the vehicle, and a control unit receiving outputs of wheel speed sensors to assess skid conditions of the wheels and to control the valve devices. The apparatus discriminates between "low side" and "high side" of the road by assessing skid conditions of either the rear wheels or the front wheels. The braking pressure of the rear or front wheel that is on the low side and that of the wheel connected diagonally to it are controlled in either a "select-high" or a "select-low" manner, and the pressures of the other diagonally opposite wheels are controlled in the opposite manner. In the alternative, the apparatus may assess the skid condition of the one rear wheel based on the larger of the braking frictional coefficients of the sides of the road, on the basis of the acceleration and slip conditions of the one rear wheel, while it judges the skid condition of the other rear wheel on the smaller one of the braking frictional coefficients of the sides of the road only on the basis of the acceleration condition of the other rear wheel, and the braking pressures of the respective conduit systems are controlled in the select-low manner.
REFERENCES:
patent: 3909070 (1975-09-01), Leiber
patent: 3972568 (1976-08-01), Fleischer
patent: 3980346 (1976-09-01), Leiber
patent: 4547022 (1985-10-01), Brearley et al.
patent: 4652060 (1987-03-01), Miyake
patent: 4657313 (1987-04-01), Fennel et al.
patent: 4717209 (1988-01-01), Hagiya et al.
patent: 4762376 (1988-08-01), Matsubura
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