Patent ID: 6318074
Filing Date: 2001-11-20
Classification: F02B,F02D,F02F,F02P,Y02T

Abstract:
A control device for a direct injection engine having a catalyst provided in an exhaust gas passage for converting exhaust gases and an injector for injecting fuel directly into a combustion chamber, the control device comprising:an identifier for judging whether the catalyst is in its unheated state in which its temperature is lower than its activation temperature;an engine temperature state detector for sensing the temperature state of the engine, anda fuel injection controller for controlling fuel injection from the injector, the fuel injection controller controlling the injector based on judgment results of the identifier and on sensing results of the engine temperature state detector in such a way that the injector makes at least two-step split injection during a period from an intake stroke to an ignition point including a later injection cycle performed in a middle portion of a compression stroke or later and an earlier injection cycle performed prior to the later injection cycle when the catalyst is in its unheated state, and the later injection cycle is retarded but performed prior to the ignition point when the catalyst is still in its unheated state but the engine temperature has become higher than a specified temperature compared to a case where the temperature of the engine is equal to or lower than the specified temperature.