| 摘要 |
PROBLEM TO BE SOLVED: To enable detection of a roll resonance frequency of an engine, while suppressing vibration due to roll resonance of the engine by controlling an active vibration isolation support device using the roll resonance frequency. SOLUTION: The natural vibration frequency of the roll resonance which does not occur since the engine rotation number is high in a normal operation range of the engine is detected at the time of engine start or stop when the engine rotation number is lower than the normal operation range, and thus the natural vibration frequency of the roll resonance can be detected with a good accuracy. A current is generated by electromotive force of an actuator of the active vibration isolation support device excited by the engine immediately before stopping its rotation, and the frequency of the current is used to detect the natural vibration frequency of the engine, and the roll resonance of the engine is suppressed by controlling the operation of the active vibration frequency isolation support device at the time of engine start from the natural vibration frequency, thereby not only eliminating the need of a specific frequency detection sensor, but also effectively reducing the vibration at the time of engine start when the roll resonance becomes strong. COPYRIGHT: (C)2009,JPO&INPIT |
