Air-fuel ratio control apparatus

摘要

An average air-fuel ratio detection circuit for generating a signal which indicates the average value of a detection signal from an air-fuel ratio sensor, and a reference value control circuit are provided in the air-fuel ratio control apparatus. The reference value control circuit controls the reference value of a comparison circuit which compares the value of the detection signal from the air-fuel ratio sensor with the reference value, in accordance with the generated signal from the average air-fuel ratio detection circuit.