Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1976-03-23
1978-11-14
Kunin, Stephen G.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188181C, B60T 810
Patent
active
041252969
ABSTRACT:
In a skid control system a pressure modulator reduces the pressure applied by a master cylinder to a wheel cylinder when the wheel velocity as measured by a wheel detector decreases faster than a deceleration predetermined by a deceleration control. A control unit which regulates the pressure modulator corrects the predetermined deceleration when the wheel has exceeded the slip ratio at which the coefficient of friction is maximum so as to achieve an optimum deceleration that corresponds to the road surface condition. The control unit induces the pressure modulator to reduce the pressure of the brake fluid and restore the wheel velocity when the coefficient of friction of the wheel reaches the maximum. Emergency braking is thus performed with an average slip ratio at which the coefficient of friction is maximum. A comparator circuit compares the wheel velocity with a signal from the control unit indicative of the velocity of the predetermined decelerator to determine when the wheel velocity has decreased faster than the predetermined deceleration.
REFERENCES:
patent: 3612622 (1971-10-01), Riordan
patent: 3650575 (1972-03-01), Okamoto
patent: 3690735 (1972-09-01), Arai et al.
patent: 3768873 (1973-10-01), Hirzel
patent: 3897114 (1975-07-01), Scharlack
Kunin Stephen G.
Toyota Jidosha Kogyo Kabushiki Kaisha
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