Patent ID: 6312062
Filing Date: 2001-11-06
Classification: B60T,Y10S

Abstract:
A brake fluid pressure control device for use in an automotive brake system including a master cylinder, a wheel brake, and a main fluid line connecting the master cylinder to the wheel brake, said device having an automatic braking function and comprising:a power pump having an inlet port connected to the main fluid line at a first point by a first fluid line, and a dishcarge port connected to the main fluid line at a second point between the first point and the wheel brake through a second fluid line;a fluid reservoir comprisiong a housing, a slider slidably mounted in said housing to liquid-tightly partition the interior of said housing into a first chamber and a second chamber, said second chamber communicating with said master cylinder, and a biasing element biasing said slider toward said first chamber;an on-off valve provided in the main fluid line between said first point and said second point;a changeover valve movable between a first position at which the inlet port and discharge port of said pump communicate with said first chamber of said reservoir and the main fluid line, respectively, and a second position at which the inlet and discharge ports of said pump communicate with the second and first chambers of said reservoirs, respectively;a control unit for closing said on-off valve and moving said changeover valve to said first position during an automatic braking mode to supply brake fluid to said pump, and otherwise opening said on-off valve and moving said changeover valve to said second position.