| 摘要 |
<p>It is an object to quickly reduce a deviation between a target rotation speed and an actual rotation speed in rotation speed control by changing an intake air quantity and changing a mechanical compression ratio. There is provided electronically controllable throttle valve 23 capable of changing the intake air quantity, and variable compression ratio mechanism 30 capable of changing the mechanical compression ratio. ECU 40 is configured to calculate a deviation between the target idle rotation speed and the actual rotation speed during idle operation, select either one or both of the intake air quantity and the mechanical compression ratio as control targets in accordance with magnitude of the deviation, and reduce the deviation by changing the selected either one or both of the intake air quantity and the mechanical compression ratio.</p> |
