Patent ID: 6044642
Filing Date: 2000-04-04
Classification: F02B,F02D,F02P,Y02T

Abstract:
A direct injection engine comprising:an injector for injecting a fuel directly into the combustion chamber,a catalyst provided in an exhaust gas passage for cleaning an exhaust gas,a temperature condition judging means for judging a temperature condition of the catalyst,a fuel supply means for forming a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion has mixture having a theoretical air fuel ratio and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surround said area of the fuel rich combustion gas mixture by means of the injector just before an ignition timing so that the air fuel ratio of the combustion gas mixture in the combustion chamber is of substantially the theoretical one as a whole when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means.