| 摘要 |
PURPOSE: A brake fluid pressure control device miniaturizes and improves the efficiency of hydraulic pump so that brake fluid is supplied promptly and reliably when brake traction control or posture control begins. CONSTITUTION: A brake fluid pressure control device comprises normal open type first solenoid valves(62a, 62b), normal open type electric shuttle valves(64a, 64b), pressure accumulators(66a, 66b) and normal closed type second solenoid valves(67a, 67b). The normal open type first solenoid valves(62a, 62b) are installed in the first flow way(21) connecting the blown port of a hydraulic pump(13) and the outlet of a master cylinder(3) and make the break fluid pass by, go through inflow valves(5a, 5b, 5c) to wheel cylinders(10a, 10b, 10c, 10d). The normal open type electric shuttle valves(64a, 64b) are installed between the outlet of master cylinder(3) and the intake port of the hydraulic pump(13). The pressure accumulators(66a, 66b) are installed in bypassing flow ways(74a, 74b) bypassing blowing pressure from the blown port of the hydraulic pump(13) to the intake port of the hydraulic pump(13) and accumulate certain hydraulic pressure. The normal closed type second solenoid valves(67a, 67b) are installed in the bypassing flow way between pressure accumulators(66a, 66b) and the intake port of the hydraulic pump(13) and maintain the fluid pressure accumulated in the pressure accumulators(66a, 66b).
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