| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the safety of a vehicle by obtaining sufficient braking force even if bottoming occurs in view of the possibility that the bottoming in which a master piston of a master cylinder makes full strokes while braking force is lowered by a vapor lock phenomenon, etc. occurs and the braking force cannot be heightened any more, in a hydraulic brake device for a vehicle, which generates the braking force by regulating hydraulic pressure supplied from a hydraulic pressure source into a value according to the braking operation amount by a pressure regulating valve, outputting it and operating the master cylinder by the output hydraulic pressure of the pressure regulating valve introduced into a pressure chamber. <P>SOLUTION: The output hydraulic pressure of the pressure regulating valve 3 and output hydraulic pressure of the master cylinder 4 are detected by a pressure sensor 13 and a master cylinder pressure sensor 14 and are compared by a bottoming detection means 15. The output hydraulic pressure of the master cylinder 4 does not satisfy a predetermined relation and the bottoming detection means 15 determines that the bottoming occurs, in this case when the output hydraulic pressure of the master cylinder is equal to or larger than predetermined first hydraulic pressure, a solenoid valve 17 is opened and a solenoid valve 18 is closed, so that the output hydraulic pressure of the pressure regulating valve 3 is supplied to a second hydraulic pressure system having wheel cylinders 7<SB>-3</SB>, 7<SB>-4</SB>. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
