| 摘要 |
PROBLEM TO BE SOLVED: To feed secondary fuel in an amount and being a component optimum to NOx reduction to an NOx catalyst. SOLUTION: In this control device, an NOx catalyst 15 capable of reducing NOx in oxidation atmosphere in arranged in an engine exhaust passage. At an engine expansion stroke or an exhaust stroke consecutive to main fuel injection, second secondary fuel injection is effected from a fuel injection valve 17 arranged in a cylinder and secondary fuel is fed to the NOx catalyst 15. A cylinder temperature is determined by a cylinder temperature sensor 38. Based on a cylinder temperature, secondary fuel injection timing is determined.
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