In-cylinder injection type internal combustion engine

摘要

An in-cylinder injection type internal combustion engine is provided which includes a main fuel injection control unit (26) that drives a fuel injector (8) to inject fuel directly into a combustion chamber (1), so that premixed combustion or startified charge combustion takes place depending upon operating conditions of the engine. The engine further includes an additional fuel injection control unit (27) that drives the fuel injector to inject additional fuel during an expansion stroke after the fuel injector is driven by the main fuel injection control unit, where it is necessary to increase the temperature of a catalyst provided in an exhaust passage for purifying exhaust gas. An exhaust manifold (10) includes an exhaust chamber in which the exhaust gas remains, and the additional fuel that is left unburned is re-burned in the exhaust chamber.