| 摘要 |
PURPOSE:To purify the exhaust gas by storing the average value of the control factor when the air fuel ratio is feedback-controlled and using the corrected value of this average value with the water temperature as the initial value of the control factor when the feedback control region is transited. CONSTITUTION:In a device adjusting the injection quantity from a fuel injection valve 6 based on the signal from an O2 sensor 15 provided on the exhaust pipe 13 of an engine 1 and controlling the air fuel ratio to the preset value, the average value of the feedback control factor in the feedback control region is calculated and stored in the memory in a control unit 5. The signal from a water temperature sensor 10 is detected, and when the engine transits from the opened loop control region to the closed loop control region, the corrected value of the average value in the memory in response to the cooling water temperature is set as the initial value. Accordingly, the CO, HC, and NOx in the exhaust gas can be invariably reduced regardless of the cooling water temperature.
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