| 摘要 |
PROBLEM TO BE SOLVED: To more surely reduce idle vibration of different frequencies by opening a changeover valve when a shift lever is in the drive range, and closing the changeover valve when the shift lever in the neutral range. SOLUTION: When the reduced frequency of idle vibration (resonant frequency of a liquid column at a second orifice passage) is set, because the rigidity of a second diaphragm 6 is changed at an opening state and a closing state between an air action chamber 71 and the atmosphere, two sorts of reduced frequencies are set. Namely because engine speed becomes the lowest when a shift lever is in the drive range, the reduced frequency in the opening state of the air action chamber 71 is set in accordance the engine speed at this time. Because the engine speed becomes the highest when the shift lever is in the neutral range, the reduced frequency in the closing state of the air action chamber 71 is set in accordance with the engine speed at the time. |
