| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of a self-lock in a normal-open valve used as a shutoff valve in a by-wire brake.SOLUTION: A differential pressure detection part 201 detects differential pressure on the basis of detection values of first and second hydraulic pressure sensors Pp, Pm. A shutoff pressure setup part 202 sets shutoff pressure that is maximum differential pressure enabling a master cut valve 60a (60b) to close. A comparison part 203 compares between the differential pressure detected by the differential pressure detection part 201 and the shutoff pressure set by the shutoff pressure setup part 202. In a case where the state of the former being larger than the latter continuing for a given period of time or more in the comparison, a backup control part 204 performs backup control. That is, in the case where the state of the former being larger than the latter continues for the given period or more, an operation of a motor 72 is decreased than in the case of otherwise, thus stopping a power supply to cause the master cut valve 60a (60b) to open. |
