| 摘要 |
Internal combustion engine control apparatus determines activation status of the O2 sensor and feasibility of feedback control. If the O2 sensor is activated and the feedback control is feasible, the apparatus computes a corrected fuel injection duration TAU based on feedback control using detected O2 concentration. For EGR control, the apparatus selects one of the two maps to retrieve EGR valve opening data based on the feasibility of feedback control, thus achieving an EGR flow in accordance with the selected air-fuel ratio control mode. The combination of the air-fuel ratio control and the EGR control achieves reduction of harmful exhaust gas components and stabilization of engine operation during an initial period after the start of engine operation.
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