Brake fluid pressure control apparatus for antiskid control and

Details Brake fluid pressure control apparatus for antiskid control and Brake fluid pressure control apparatus for antiskid control and

1993-10-07

1995-12-05

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303 10, 3031162, B60T 1318

Patent

active

054722683

ABSTRACT:
The present invention relates to a brake fluid pressure control apparatus provided with a flow valve which, during the normal operation, when a spool is in the stationary position, a master cylinder communication port is communicated with a wheel cylinder communication port while the pump communication port is closed, and during an antiskid control operation, a pump communication port and a wheel cylinder communication port are communicated, as well as a switching device to switch between the first and the second conditions. In the first condition, a master cylinder communication port is communicated with the output fluid passage of the master cylinder while the communication between the pump communication port and the master cylinder communication port is shut off. In the second condition, the communication between the master cylinder communication port and the output fluid passage of the master cylinder is shut off while the pump communication port and the master cylinder communication port are communicated. Therefore, when two functions, antiskid and traction controls, are to be provided to a brake fluid pressure control apparatus having an antiskid control capability, there is no need to change the flow valve itself, in particular the spool, to provide the two functions.

REFERENCES:
patent: 4362339 (1982-12-01), Belart
patent: 4729611 (1988-03-01), Kircher et al.
patent: 4750788 (1988-06-01), Seibert et al.
patent: 4941712 (1990-07-01), Hirobe
patent: 5026123 (1991-06-01), Nokubo et al.
patent: 5303990 (1994-04-01), Ando et al.

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