| 摘要 |
PURPOSE:To use an atmospheric pressure sensor of low response-ability by obtaining a suction density correction coefficient as a function in which the inner pressure of a suction pipe of the downstream of a throttle valve, a suction temperature on the upstream side of a compressor for a supercharger and atmospheric pressure are used as parameters. CONSTITUTION:In a counter 6 to which outputs from revolution sensors 1, 2 adjacently disposed to a cam shaft CA interlocked with the revolution of the engine and a pulse output from a clock oscillation circuit 5 are inputted, a signal proportional to the number of revolution Ne of the engine is obtained. Fundamental fuel injection-quantity Ti is counted by a fundamental fuel injection-quantity counting circuit 13 from an output thetath from a throttle-valve opening sensor 8 and the number of revolutions Ne. A suction density correction coefficient gammaA is read from a suction density correction-coefficient memory circuit 26 by using the inner pressure PB of the suction pipe of the downstream of the throttle valve by a pressure sensor 7, the suction temperature T1 of the upstream of the compressor by a temperature sensor 9 and atmospheric pressure PO1 by the atmospheric pressure sensor 10, the quantity of injection Ti is corrected by the coefficient gammaA, and each injection valve 35, 36 is controlled by the quantity of injecion corrected T. |
