| 摘要 |
<p>PROBLEM TO BE SOLVED: To promote the warming up of the catalyst without losing the stability of combustion by switching air-fuel mixture ratio between rich and lean per each predetermined cycle during the time till the catalyst is concluded, and dividing the fuel of the rich combustion to a part to be given for combustion and a part to be given for non-combustion for supply. SOLUTION: A judgment whether an internal combustion engine is rotating at an engine speed or not is performed (S1), in the case of rotating, a judgment whether the condition for rich or lean combustion is satisfied or not is performed per each cylinder (S2). In the case where the condition is satisfied, air-fuel ratio feedback control is stopped, and fuel injection variable of the rich cylinder to be given for combustion and to be given for non-combustion is set (S3). Fuel is jet to the lean cylinder on the basis of the fuel injection variable of the lean cylinder, which is previously set so as to supply oxygen enough for oxidation of the oxide to be discharged from the rich cylinder at the set fuel injection variable (S4). Ignition of the rich cylinder is performed at the same time with the ignition time, which is simultaneously set with the fuel injection variable of the rich cylinder and of which delay angle is corrected, and the torque to be generated by the rich cylinder is controlled at the torque to be generated by the lean cylinder (S5).</p> |
