| 摘要 |
PROBLEM TO BE SOLVED: To accurately detect abnormal pressure variations in a hydraulic system at a time of starting the brake control. SOLUTION: During car stoppage, pressure to be supplied to a braking device is held to the specified pressure value by the operation of pressure control valves SoL1/5 and SoL3/7, while this pressure value is stored by a storage means, At starting car, holding pressure being supplied to the braking device is detected there after by two pressure detecting means P1 and P2 before operations of these pressure control valves SoL1/5 and SoL3/7, and on the basis of a comparison between the holding pressure value and the specified pressure value, abnormality in these pressure control valves SoL1 to 8) is detected.
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