| 摘要 |
PURPOSE:To reduce production of NOx, by a method wherein, in a device which fuel, providing a lean air-fuel ratio, in injected through a part of injection valves, the fuel is injected through said injection valve between the second stage of an exhaust stroke and a suction stroke, and the fuel is injected through other injection valve between a compression stroke and the first stage of the exhaust stroke. CONSTITUTION:In a drive in which a fuel injection valve 12 is installed in an intake air branch 11 communicated with an intake air port 5 of each cylinder for 4-cylinder engine, ignition is set in the order of #1, #3, #4, and #2, the #1 and #4 cylinders are set as a lean cylinder which provides a lean air-fuel ratio, and the #3 and #2 cylinders as a stoiki cylinder which provides a value near to a theorectical air-fuel ratio. In this internal-combustion engine, control is effected such that fuel is injected through a fuel injection valve 12 on the lean cylinder side between the second stage of an exhaust stroke and a suction stroke, and the fuel is injected through the fuel injection valve 12 on the stoiki cylinder side during a compression stork and the first stage of the exhaust stroke. This increases a learn combustion limit, and decrease production of NOx.
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