| 摘要 |
<p>PURPOSE:To provide the warming-up accelerating device of an engine improving the warm-up property of the engine. CONSTITUTION:The idle rotating speed of an engine 1 is controlled by an ISC valve provided on a bypass passage 17 bypassing a throttle valve 16. An exhaust valve 4 can be switched to the first valve timing and the second valve timing by a valve timing changing mechanism 7, and the second valve timing is delayed than the first valve timing for closing the exhaust valve 4. When the second valve timing is selected, the valve overlap of an intake valve and the exhaust valve 4 is expanded. The second valve timing is set at the time of a cold start in the no-load, low-rotation area I, and the valve overlap is expanded. The ignition timing is largely retarded at the time of the cold start in addition to the overlap control in the no-load, low-rotation area I. The residual gas is increased at the time of the cold start, and combustion is performed in the later half of the expansion stroke when the ignition timing is retarded.</p> |
