초록 ▼

A direct injection engine including, an ignition plug projected into a combustion chamber, 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 senisor for detecting a coolant temperature condi

A direct injection engine including, an ignition plug projected into a combustion chamber, 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 senisor for detecting a coolant temperature condition of the catalyst, a control unit, for receiving signals from the sensor to determine that the catalyst is lower than an activation temperature when the engine coolant temperature is lower than a predetermined value, for calculating a fuel injection timing and fuel injection amount from the injector to form a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion as mixture having a theoretical air fuel ratio and a fuel lean combustion as mixture leaner than the combustion as mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture when it is determined that the temperature of the catalyst is lower than an activation temperature, and, for producing signals to the injector to inject the fuel at the fuel injection timing. The emission performance of the exhaust gas is improved. The warming up of the catalyst as well as the engine is facilitated.

대표청구항 ▼

[ What is claimed is:] [1.] 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

[ What is claimed is:] [1.] 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.