CONTROL DEVICE FOR AIR-FUEL RATIO OF INTERNAL COMBUSTION ENGINE

摘要

PURPOSE:To perform accurate air-fuel ratio control irrespective of changes in suction air temperature by detecting the suction air temperature on the downstream side of a supercharger, calculating a correction factor for compensating the escape of fresh intake according to the detected value, and correcting a fuel supply rate. CONSTITUTION:A 2-cycle internal combustion engine 1 or the like having a large escape ratio of fresh intake is provided with a means 2 for supplying a required rate of fuel to the engine 1 and a means 3 for calculating the fuel supply rate determined by operating conditions such as load and rpm of the engine 1. A means 4 is also provided for detecting a temperature of suction air on the downstream side of a supercharger 2' and a means 5 is further provided for calculating a correction factor value for compensating the escape of the fresh intake according to the detected temperature of the suction air and for correcting the fuel supply rate calculated with the means 3. A means 6 is further provided for forming a fuel supply signal to be sent to the means 2 so that a corrected rate of fuel is supplied to the internal combustion engine 1.