| 摘要 |
A fuel injection control system for use in an internal combustion engine having a catalyst in its exhaust path. Each cylinder is provided with a fuel injection valve for injecting fuel thereinto amounting to a reference injection quantity which is set according to a loaded state of the internal combustion engine. Each cylinder is also provided with a spark plug for producing spark ignition therein at each period of reference ignition timing which is established according to the loaded state of the internal combustion engine. The fuel injection control system is provided with a controller which controls the fuel injection valve such as to increase and decrease the reference fuel injection quantity by a different amount per cylinder without a change in the total of the reference fuel injection quantity, and which also varies this fuel increase and decrease according to the loaded state of the internal combustion engine. The controller further controls the spark plug such as to retard the reference ignition timing by an amount different from one cylinder to another, and varies this retardation according to the loaded state of the internal combustion engine. This control is effected when the internal combustion engine is in an operating state which conforms to predetermined conditions.
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