| 摘要 |
An intake lift amount variation mechanism (14i), which changes the maximum lift amount and the valve- open period for an intake valve (9), and an exhaust lift amount variation mechanism (14e), which changes the maximum lift amount and the valve open period for an exhaust valve (10), are provided in an internal combustion engine (1). During an idling operation wherein the temperature of the internal combustion engine (1) is equal to or higher than a reference value , a control device (26) executes a process whereby the valve open period of the intake valve (9) is increased and the valve- open period of the exhaust valve (10) is reduced. |
