Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1986-11-12
1988-10-18
Kashnikow, Andres
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 93, 303 974, 188106P, B60T 858, B60T 886, F16D 6514
Patent
active
047782234
ABSTRACT:
An anti-skid braking system for an automotive vehicle, including a first brake system and a second brake system. The first brake system has a master cylinder for generating a fluid pressure corresponding to an operation value of a brake operating member, a first brake for a wheel of the vehicle equipped with a brake cylinder actuated by the pressure of the master cylinder, and a first solenoid valve device between the master and brake cylinders and operable between a first and a second position for communication of the brake cylinder with the master cylinder and a reservoir, respectively. The braking system includes a second brake system which has a second brake cooperating with the first brake to apply a brake to the wheel; a speed sensor for detecting a speed of the wheel; and an anti-skid controller for estimating a slip ratio of the wheel based on the detected speed. The anti-skid controller controls the first solenoid valve device, if the estimated slip ratio of the wheel has exceeded a predetermined upper limit, to lower the pressure in the brake cylinder to a level at which the slip ratio is in a predetermined optimum range, the anti-skid controller subsequently controlling a brake force of the second brake, to maintain the slip ratio within the optimum range.
REFERENCES:
patent: 3608979 (1971-09-01), Coyle
patent: 3895698 (1975-07-01), Fontaine
patent: 3971595 (1976-07-01), Kondo
patent: 4327414 (1982-04-01), Klein
patent: 4508393 (1985-04-01), Drometer
patent: 4602824 (1986-07-01), Nishimura et al.
patent: 4630871 (1986-12-01), Imoto et al.
patent: 4658939 (1987-04-01), Kircher et al.
Kashnikow Andres
Newholm Timothy
Toyota Jidosha & Kabushiki Kaisha
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