| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect leakage of a liquid from a pressure-reduction valve when a hydro-booster mode is selected in a hydraulic brake device. <P>SOLUTION: At a control mode that a hydraulic fluid is fed from two systems of a master flow passage and a regulator flow passage to a plurality of wheel cylinders in the state that the pressure-reduction valve is closed, when a hydraulic pressure detected by a regulator pressure sensor is not coincident with an hydraulic pressure calculated based on the detection value of a stroke sensor, an abnormality detection part 82 determines that abnormality of any one of failure of the regulator pressure sensor or leakage of the liquid from the pressure-reduction value is generated. When it is determined that the abnormality is generated, an accumulator state determination part 84 determines whether or not the accumulator maintains the constant state during when the hydraulic fluid is fed from the regulator to the plurality of wheel cylinders. When the accumulator does not maintain the constant state, a liquid leakage specifying part 86 determines that the leakage of the liquid from the pressure-reduction valve is generated. <P>COPYRIGHT: (C)2009,JPO&INPIT |
