Fluid-pressure and analogous brake systems – Speed-controlled – With failure responsive means
Patent
1996-09-26
1998-01-27
Ballato, Josie
Fluid-pressure and analogous brake systems
Speed-controlled
With failure responsive means
3031171, B60T 1312, B60T 1368
Patent
active
057115842
ABSTRACT:
A hydraulic brake apparatus maintains a sufficient amount of brake fluid in a master cylinder when a failure occurs in a high pressure brake fluid source which provides a high pressure brake fluid to a wheel cylinder. The hydraulic brake apparatus generates a wheel cylinder pressure provided to the wheel cylinder by using a high pressure brake fluid provided by the high pressure brake fluid source. The wheel cylinder pressure is controlled in response to a master cylinder pressure generated by a master cylinder. A fluid pressure control valve, having a spool movable in response to the master cylinder pressure, connects one of the high pressure brake fluid source and a low pressure brake fluid source to the wheel cylinder so that the wheel cylinder pressure is controlled in response to the master cylinder pressure. A low pressure source passage connects the low pressure brake fluid source to the fluid pressure control valve so as to supply a low pressure brake fluid to the fluid pressure control valve. A low pressure source passage control valve closes the low pressure source passage when the high pressure brake fluid is not provided to the fluid pressure control valve.
REFERENCES:
patent: 5330258 (1994-07-01), Hoshoya et al.
patent: 5486040 (1996-01-01), Beck et al.
Ballato Josie
Toyota Jidosha & Kabushiki Kaisha
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