| 摘要 |
PROBLEM TO BE SOLVED: To reduce flowing of hydraulic fluid of high pressure to a master cylinder when unnecessarily opening a cut-off valve and fluctuation of reaction of a brake pedal and energy loss caused by the flowing. SOLUTION: Target wheel cylinder pressure Pti of each wheel is calculated according to braking manipulated variable of a driver (S20). Wheel cylinder pressure Pi is controlled to be the target wheel cylinder pressure Pti (S30 to S60). When voltage of a battery power source 96 is temporarily lowered and there is a possibility of unnecessarily opening solenoid opening/closing valves 24L and 24R as the cut-off valves when starting an engine, a ratio of pressure within each wheel cylinder in relation to the braking manipulated variable of the driver is controlled to be a smaller value (S30, 50) as compared with a normal control time (S40) of braking force. As a result, pressure and flow rate of oil flowing to the master cylinder 14 are reduced. COPYRIGHT: (C)2004,JPO&NCIPI
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