| 摘要 |
PROBLEM TO BE SOLVED: To enhance the durability of a hydraulic system by solving a problem occurring in the hydraulic system when an oil temperature is too low or too high. SOLUTION: A microcomputer 30 adjusts/controls the actual vehicle height of a vehicle to a target vehicle height by controlling an electric motor 21, leveling valves 24a, 24b and an accumulator valve 26 so as to eliminate the deviation of the actual vehicle height relative to the target vehicle height based on the actual vehicle height detected by vehicle height sensors 33a-33c. When the oil temperature T detected by an oil temperature sensor 34 is extremely low or high, the control of the vehicle height adjustment and the feed of operation oil to an accumulator 25 are interrupted by stopping the operation of the electric motor 21 and a hydraulic pump 22 and switching respective valves 24a, 24b, and 26 to closed states. Thereby, it is avoided that a load of the hydraulic pump 22 becomes large and a delivery capacity is reduced by the fact that the viscosity or fluidity property of the operation oil is extremely high or low. COPYRIGHT: (C)2005,JPO&NCIPI |
