| 摘要 |
PURPOSE:To make it possible to control the air-fuel ratio of supply mixture with a high degree of accuracy during low load operation of the engine, and to control the supply amount of fuel over a wide range during operation of the engine in a condition other than the low load condition by changing over fuel injection valves for supplying and controlling the fuel in accordance with the load of the engine. CONSTITUTION:In an internal combustion engine comprising a plurality of engine cylinders, an fuel injection valve 6 and an auxiliary fuel injection valve 6a are disposed respectively upstream and downstream of a throttle valve 3', and an ECU 5 controls the supply of fuel. During the engine 1 operates in a low load condition in which the opening degree of the throttle valve 3' detected by a throttle valve opening sensor 4 is smaller than a predetermined value, fuel is fed and controlled from the auxiliary fuel injection valve 6a. With this arrangement, it is possible to control the air-fuel ratio of mixture with a high degree of accuracy. Meanwhile, during operation other than low load operation, fuel is fed and controlled from the fuel injection valve 6. Thereby it is possible to feed and control the amount of fuel over a wide range. |
