| 摘要 |
PROBLEM TO BE SOLVED: To detect an operation failure abnormality of a relief accumulator provided on a suspension mechanism based on the variation of liquid pressure at a low pressure source side. SOLUTION: In a state that a spring constant is small, even if a suspension stroke becomes large, pressure does not become set system limit pressure or higher (a). In a state that the spring constant is large, a pressure increase gradient accompanied by the variation of a stroke becomes large. When the relief accumulator 37 is normal, since an operation fluid is stored when the fluid has system set pressure or higher, the increase gradient is suppressed and the fluid has not system upper limit pressure or higher (b). In contrast thereto, when the relief accumulator 37 has operation failure abnormality, the pressure becomes relief upper limit pressure or higher and the operation fluid flows out from a vehicle height control valve 110 to a reservoir 74 (c). Since detection pressure by a liquid pressure sensor 92 is temporarily increased, the abnormality of the relief accumulator 37 can be detected. COPYRIGHT: (C)2008,JPO&INPIT
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