| 摘要 |
PURPOSE:In an air-fuel ratio controller employing O2 sensor, to correct the shift of static air-fuel ratio of integrating information correctly, by modifying the correcting amount to be stored in a non-volatile memory through the difference between the average integrating information and the predetermined intermediate reference. CONSTITUTION:The detected level from O2 sensor 35 is provided to a comparator CP while the decision signal between lean and rich is integrated in a counter CT1 then said level and the level stored in a nonvolatile memory (REG1-REG3) selected in accordance to the suction air are employed to set the numeric value to a frequency divider DIV thus to control the injection time. A counter CT2 provided with the output from the comparator CP will add the count of the counter CT1 to 16 time adder ADD1 every time when the output from the comparator is inverted and to provide the 16 time average value of the maximum and minimum integrating information to a correction arithmetic unit 43. Said unit 43 will correct the content in the memory on the basis of said average value. |
