| 摘要 |
PROBLEM TO BE SOLVED: To provide a suspension device improved in reliability by enhancing decision accuracy of leakage of working fluid, while suppressing an increase of manufacturing cost. SOLUTION: Leakage of each pipe is decided (step 39 and 40) by comparing differential pressure between estimated system pressure and actually measured pressure with a threshold value (step 38). In this case, the estimated system pressure is estimated based on an estimated temperature of the working fluid in each pipe. The threshold value is set according to the estimated temperature of the working fluid. Estimation accuracy of pressure of the working fluid in each pipe therefore can be enhanced as compared with a conventional technique. As a result, reliability of the suspension device can be improved. Each temperature sensor for detecting the temperature of the working fluid in each pipe is not required to be provided, and thereby the increase of the manufacturing cost can be suppressed. COPYRIGHT: (C)2010,JPO&INPIT
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