Fluid-pressure and analogous brake systems – Speed-controlled – With failure responsive means
Patent
1997-07-21
1999-09-14
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
With failure responsive means
3031161, 3031191, 303901, 3031131, 303166, 303162, B60T 832
Patent
active
059511206
ABSTRACT:
A hydraulic brake control apparatus in which a master cylinder is connected to wheel cylinders via a master cylinder cut valve, and the wheel cylinders are connected to a reservoir tank via a switching valve, includes a check valve provided between the master cylinder and the wheel cylinders in parallel with the master cylinder cut valve, the check valve provided in a bypass passage of the master cylinder cut valve, the check valve allowing a flow of a brake fluid from the master cylinder to the wheel cylinders and inhibiting a flow of the brake fluid from the wheel cylinders to the master cylinder. A valve control unit controls the switching valve when it is detected that a closed-position defect in the master cylinder cut valve has occurred and a pressure of the brake fluid in the master cylinder is decreasing, so that the switching valve is set at an open position to allow a flow of the brake fluid from the wheel cylinders to the reservoir tank through the switching valve and reduce a pressure of the brake fluid in the wheel cylinders.
REFERENCES:
patent: 4789938 (1988-12-01), Maehata et al.
patent: 4812277 (1989-03-01), Shirai
patent: 5232272 (1993-08-01), Berisch et al.
patent: 5240314 (1993-08-01), Morita
"Electrohydraulic Brake System--The First Approach to Brake-By-Wire Technology" by Wolf-Dieter Jonner et al, SAE 960991, Feb. 1996.
"The Development and Testing of an Integrated Systems Demonstrator Vehicle" by S D Stevens BEng, Autotech 95 C498/35/157, 1995.
Kawahata Fumiaki
Morikawa Hirohiko
Nakamura Kiyoharu
Ohtomo Akihiro
Sakai Akira
Butler Douglas C.
Toyota Jidosha & Kabushiki Kaisha
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