| 摘要 |
PROBLEM TO BE SOLVED: To provide a suspension control system that can ensure calmness of a vehicle, by suppressing operation sound accompanying unload control, and at the same time regulate variation in the number of engine revolutions. SOLUTION: Provided that an automobile is stopped or is running slowly (step S12: Yes), if system accumulator pressure is the maximum pressure of the system or lower, the opening of an unload valve is reduced, so the unload valve is set to a semi-closed condition (step S15), and the passing volume of oil is restricted. For this reason, when an ordinary unload control is executed while the automobile is traveling at a pace exceeding a standard speed, if the vehicle speed is reduced to not higher than the standard speed, including stoppage, the unload valve is not be opened widely, even if the pressure of the system accumulator is not higher than the maximum system pressure, and changes in the passing valve of the oil and movement of the spool are suppressed. Therefore, generation of the operation sound of the control valve (unload valve) can be suppressed and change in the number of engine revolutions can be suppressed. COPYRIGHT: (C)2004,JPO
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