Internal combustion engine with turbo-charger and knocking control system

摘要

A fuel injection system for an internal combustion engine provided with a turbo-charger and an ignition retard control system responsive to a signal from knocking sensor for controlling knocking. A system is provided for attaining a fuel enrichment correction at a predetermined range of engine conditions for preventing an increase in a temperature of the exhaust gas. The enrichment is delayed for a predetermined period after moving into that range, to obtain a high fuel economy. A system is further provided for cancelling the enrichment delay when the engine is under a particular condition where the exhaust gas temperature is very apt to be increased. Such a condition is detected by an enrichment correction value or ignition retard correction value which is larger than a threshold value.