| 摘要 |
PURPOSE:To maintain the air-fuel ratio at a predetermined value despite the age variation by detecting deviation in the distortion due to age variation to control the fuel injection time. CONSTITUTION:In a construction in which outputs of a pressure sensor 30, a throttle sensor 54, an air valve 42 and an oxygen concentration sensor are inputted in a control circuit 34 to control a fuel injection valve 16, when it is judged that the engine is in a state of being close to idling, though it is not in idling, by a signal from the sensor 54, the fundamental injection time is corrected by a correction coefficient K. When it is judged that the engine is idling, a correction quantity tauG at the time of idling is further added to the above correction coefficient K. Concretely speaking, when the ratio FAFav of the air- fuel ratio with respect to the theoretical air-fuel ratio is calculated, and when it is judged that the ratio FAF is distorted to the lean part and further it is close to the vicinity of idling, a differentiation increment DELTAK is added to the correction coefficient K, if the engine is found idling, a predetermined increacent DELTAtau is added to the correction quantity tauG. |
