Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1997-07-01
1999-11-30
Schwartz, Christopher P.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
B60T 840
Patent
active
059929499
ABSTRACT:
A hydraulic brake control apparatus in which a master cylinder supplies a brake fluid pressure responsive to a brake operating force to wheel cylinders through a first valve, includes a first control unit which controls second valves and third valves when a brake fluid pressure supplied to the wheel cylinders by a pressure supplying device is detected to be excessively high under a condition in which the supply of the brake fluid pressure to the wheel cylinders by the master cylinder is inhibited by the first valve, so that the supply of the brake fluid pressure to the wheel cylinders by the pressure supplying device is inhibited by the second valves and a flow of the brake fluid from the wheel cylinders into a reservoir tank is allowed by the third valves. A second control unit controls the third valves and the first valve at a predetermined time after the flow of the brake fluid from the wheel cylinders into the reservoir tank is allowed, so that the flow of the brake fluid from the wheel cylinders into the reservoir tank is inhibited by the third valves and the supply of the brake fluid pressure to the wheel cylinders by the master cylinder is allowed by the first valve.
REFERENCES:
patent: 5560690 (1996-10-01), Hattori et al.
patent: 5683149 (1997-11-01), Aizawa et al.
patent: 5727851 (1998-03-01), Ohkubo et al.
Kawahata Fumiaki
Morikawa Hirohiko
Nakamura Kiyoharu
Ohkubo Masayasu
Ohtomo Akihiro
Schwartz Christopher P.
Talavera Melanie
Toyota Jidosha & Kabushiki Kaisha
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