Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1991-04-18
1992-08-25
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303116R, 303 10, 310328, B60T 848
Patent
active
051412977
ABSTRACT:
A brake control device for vehicles includes a master cylinder, a plurality of wheel cylinders, and an anti-lock control apparatus disposed between the master cylinder and the wheel cylinders of at least one hydraulic circuit. The anti-lock control apparatus includes a hydraulic pump, a reservoir and a changeover device which is selectively changed over at least between a first condition which permits an increase in the hydraulic pressure of the wheel cylinders of at least one hydraulic circuit and a second condition which permits an decrease in the hydraulic pressure of the wheel cylinders of at least one hydraulic circuit in response to the locking condition of the road wheels. The hydraulic pump includes a housing, a slidable piston device for defining a pump chamber which is communicated with the reservoir and the changeover device at a side of one end thereof in the housing, an inlet check valve disposed between the pump chamber and the reservoir for permitting fluid communication from the reservoir to the pump chamber and for interrupting fluid communication from the pump chamber to the reservoir, an outlet check valve disposed between the pump chamber and the changeover device for permitting fluid communication from the pump chamber to the changeover device and for interrupting fluid communication from the changeover device to the pump chamber, and a piezo element for reciprocating the piston device disposed at the other end of the piston device.
REFERENCES:
patent: 3501099 (1970-03-01), Benson
patent: 3598506 (1971-08-01), O'Neill
patent: 4738493 (1988-04-01), Inagaki et al.
patent: 4989924 (1991-02-01), Toda et al.
patent: 5021957 (1991-06-01), Yoshino et al.
Funakawa Jun
Inden Masahiro
Kuwabara Yasuo
Kuwana Kazutaka
Morita Tetsuya
Aisin Seiki Kabushiki Kaisha
Ballato Josie A.
Graham Matthew C.
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