Fuel injection controlling apparatus for engine

摘要

The invention provides a fuel injection controlling apparatus for an engine that reduces NOx amounts in an exhaust gas of a Diesel engine conducting lean combustion. An inter-cylinder injector ( 20 a) is arranged in each cylinder of an engine ( 1 ). An intake port/manifold injector ( 21 a) is arranged at an inlet of each cylinder of an intake manifold ( 5 ). A speed sensor ( 32 ) for detecting the engine speed is provided to the engine. A controller ( 31 ) is connected to the speed sensor ( 32 ), the inter-cylinder injector ( 20 a) and the intake port/manifold injector ( 21 a), and calculates an engine load. The intake port/manifold injector ( 21 a) injects the fuel when the engine load is low, and the inter-cylinder injector ( 20 a) injects the fuel when the engine load is high.