| 摘要 |
PROBLEM TO BE SOLVED: To detect air presence/absence in a brake system while reducing energy consumption in a hydraulic brake device. SOLUTION: Communicating brake cylinders 20,21 of front left/right wheels with a master cylinder 12 stores working fluid of the master cylinder 12 in the brake cylinders 20,21. Then, master blocking valves 29,30 are made to be a closing status, boosting linear valves 150-152 are made to be opening statuses, and a pressure reduction linear valve 162 is made to be a closing status. The brake cylinders 20,21,22 are communicated with each other to have the same hydraulic pressures. When the hydraulic pressure is higher than a first hydraulic pressure for air presence/absence detection, the air is determined to be absent in a second braking system 232. When the hydraulic pressure is as low as or lower than the first hydraulic pressure for air presence/absence detection, the air is determined to be present. Not using a power type hydraulic pressure source 14 but using the working fluid of the master cylinder 12 can reduce the energy consumption at the time of detecting air presence/absence. COPYRIGHT: (C)2005,JPO&NCIPI
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