Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1990-02-20
1991-01-22
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303106, 303116, 303119, B60T 832
Patent
active
049866117
ABSTRACT:
An anti-locking control system for use in a motor vehicle having four wheels, comprising a hydraulic pressure supply system for applying a braking pressure from a master cylinder to two pairs of wheel-braking cylinders for braking the pair of wheels and a pump provided in common for the two pairs of cylinders in the hydraulic pressure supply system to decrease both the braking hydraulic pressures in each pair of wheel-braking cylinders. The hydraulic pressure supply system includes a pair of control valves each of which is arranged to have a first position at which the master cylinder is communicated with each of the pair of wheel-braking cylinders and a suction side of the pump is disconnected to the wheel-braking cylinder and a second position for disconnection to the wheel-braking cylinder and communication with the cylinder. Also provided in the control system an electronic control unit for effecting duty control of the pair of control valves so that the time periods at which the pair of control valves are at the second positions are not overlapped with each other. With this arrangement, although the pressure-decreasing is effected by one pump provided in common for the respective wheel-braking cylinders, it is possible to adequately effect the pressure-decreasing with respect to the lower-pressure side wheel-braking cylinder.
REFERENCES:
patent: 3637264 (1972-01-01), Leiber et al.
patent: 4099793 (1978-07-01), Iio
patent: 4123116 (1978-10-01), Carp et al.
patent: 4865397 (1989-09-01), Inoue et al.
patent: 4939656 (1990-07-01), Hoashi et al.
Goshima Takahiro
Kishimoto Masashi
Wakata Hideo
Yogo Kazutoshi
Butler Douglas C.
Nippondenso Co. Ltd.
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