| 摘要 |
PURPOSE:To effectively decrease a quantity of NOx by providing an intake air meter injector in the intake air system of an engine of a type for injecting fuel staying inside cylinders, and supplying a quantity of HC required for decreasing the quantity of NOx also to the intake air system through a process of injecting fuel. CONSTITUTION:In the case of a diesel engine 3 provided, in its cylinder, with injector 5 for injecting fuel in which a catalyst converter 7 is provided in its exhaust system, an injector 14 for fuel injection is installed in its intake air system 2 in the similar way, and also an NOx sensor 15 is installed on the outlet side from the catalyst converter 7. An engine load condition is detected at first from outputs of an engine rotational speed sensor 11 and a control lever sensor 12 in a controller 13, and an injection basic quantity from the intake air system injector 14 is found out by map retrieval by means of the detected result, and thereby a corrected injection quantity is found out from a detected value of NOx concentration and a quantity obtained by adding this corrected injection quantity to the injection basic quantity is injected from the injector 14. |
