Patent ID: 6666019
Filing Date: 2003-12-23
Classification: F02D,Y02T

Abstract:
An exhaust emission control system of an internal combustion engine having a fuel injection device that carries out main injection of fuel into cylinders of the internal combustion engine and then carries out sub injection of additional fuel in an expansion stroke, comprising:an exhaust emission control device disposed in an exhaust passage of the internal combustion engine and reduces harmful matters in exhaust; an operating state detecting device that detects an operating state of the internal combustion engine; a target injection timing setting device that sets a target injection timing for the sub injection based on the operating state of the internal combustion engine; and a control device that provides a control such that an actual injection timing for the sub injection is set at a point earlier than the set target injection timing when the sub injection is started, and the actual injection timing for the sub injection is then delayed thereafter such that the actual injection timing becomes closer to set target injection timing.