Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1996-03-22
1999-11-23
Schwartz, Christopher P.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
B60T 838
Patent
active
059887699
ABSTRACT:
A brake system for a vehicle includes a liquid pressure generating device for generating a liquid pressure for braking dependent upon a manual operation, an actuator for generating a liquid pressure for braking dependent upon an electrical command signal, and an electromagnetic switchover valve which is switchable between a first state in which a wheel brake is connected to the liquid pressure generating device upon deenergization of the electromagnetic switchover valve, and a second state in which the wheel brake is connected to the actuator upon energization of the electromagnetic switchover valve. The brake system further includes a controller. The controller determines whether the regulation of braking force is necessary depending upon the behavior of the vehicle or a wheel, determines an amount of braking force required to be generated by the brake, and determines an electrical command signal to be applied to the actuator, dependant upon the required amount of braking force, when the regulation of brake force is necessary. Further, the controller controls the switching operation of the electromagnetic switchover valve device between the first state in which the regulation of braking force is unnecessary, and the second state in which the regulation of braking force is necessary. The switching of states may be based upon an elapsed time or based upon equalizing pressures between the actuators and the liquid pressure generating device. Thus, it is possible to reduce the frequency of operation of each of the actuator and the electromagnetic switchover valve device and to eliminate the need for a stroke accumulator, thereby providing a simplified structure.
REFERENCES:
patent: 4715666 (1987-12-01), Farr
patent: 5372412 (1994-12-01), Yagi
patent: 5431489 (1995-07-01), Lee
patent: 5435636 (1995-07-01), Sasanoi
Hayashi Toshio
Inagaki Hiromi
Mochizuki Kazuhiko
Suto Shinji
Bartz C. T.
Honda Giken Kogyo Kabushiki Kaisha
Schwartz Christopher P.
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