| 摘要 |
After initial combustion at the time of engine startup under very low temperature conditions, a fuel-injection start time point and a fuel-injection end time point are restricted to a period of time during which smoldering of an ignition plug is less prone to occur, to warm up the inside of a cylinder and increase engine speed. Thereafter, a fuel injection period is adjusted by gradually elongating it by reducing the restriction on the injection start time point and the injection end time point each time the engine speed exceeds a predetermined value in the course of the increase in the engine speed. In this way, the engines are made to reach a state where the engine can operate in a self-sustaining manner, before smoldering of the ignition plugs progresses after the initial combustion at the time of the engine startup under very low temperature conditions.
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