METHOD OF CORRECTING INJECTION QUANTITY OF ELECTRONIC FUEL INJECTION CONTROLLING DEVICE OF INTERNAL-CONBUSTION ENGINE

摘要

PURPOSE:To make it unnecessary to provide a suction air pipe inner pressure detecting sensor on the compressor downstream side to lower the cost of the titled device by obtain a suction air density correction coefficient as a function of the suction pipe inner pressure on the upsteram side of a compressor of a supercharger, the temperature of suction air, and a suction pipe inner pressure on the downstream side of a throttle valve. CONSTITUTION:The titled controlling device determines a basic fuel injection quantity Ti in a basic fuel injection quantity calculating circuit 13 from a rotational speed Ne obtained in a rotational speed sensor 6 from output signals from rotation sensors 1 and 2 which detect the standard position of a cam shaft C of the engine, the suction pipe inner pressure PB due to a pressure sensor 7 or a throttle valve opening degree thetaTH due to a throttle valve opening degree sensor 8 in a basic fuel injection quantity calculating circuit 13. This injection quantity Ti is corrected in a multiplying circuit 30 by a suction air density correcting coefficient etaA corresponding to the driving condition of the engine, to thereby control injection valves 35 and 36, respectiely. In this case, the above described correction coefficient gammaA is obtained in a suction air density correction coefficient memory circuit 26 from the suction pipe inner pressure PB, the suction air temperature T1 due to the suction air temperature sensor 9 and the suction pipe inner pressure P1 on the upstream side of the compressure of the supercharger.