Method and system for controlling engine

摘要

An engine control system for an engine equipped with an exhaust gas recirculation system (23) operative to recirculate partly exhaust gas into an intake system includes an engine output sensor (9) and a control unit (35) for making a decision of abnormality of control of a change in fuel injection mode which is made to cause a change in HC concentration of exhaust gas when engine output does not meet said change in fuel injection mode.