| 摘要 |
PURPOSE:To eliminate dispersion of emission values by correcting discrepancy of the control center, in accordance with concentration of the air-fuel ratio in case when an engine starts the high-load high-speed operation, for example in acceleration, etc. CONSTITUTION:The output of an air-fuel ratio decision circuit 47 into which the detection value by an O2 sensor element part 20 is input is fed into an air-fuel ratio controlling circuit 49, and further fed into an AND-circuit 57 through an inverter circuit 55. A high-load high revolution detecting circuit 56 is connected to the other input terminal of the AND-circuit 57, and when the status of high- load high-speed revolution is detected on the basis of the intake air amount and the number of revolution, the air-fuel ratio value at that timepoint is maintained in a hold circuit 64 for a certain time. Switches 58 and 59 or switches 62 and 63 are closed on the basis of the held value in the HOLD circit 64, and the voltages corresponding to the proportional part and the integration part are transmitted into air-fuel ratio control circuit 49 through terminals 50 and 51 or terminals 60 and 61. |
