| 摘要 |
PURPOSE:To increase responsiveness by making a comparing reference value a slightly lower value than the maximum output value of an O2 sensor when the output of said O2 sensor is above a defined value, while making said comparing reference value a slightly higher value than the minimum output value of said O2 sensor when the output is below the defined value. CONSTITUTION:A basic injection quantity operating means 1 operates a basic injection quantity Tp based on intake air quantity Q and engine speed N, and an air-fuel ratio feedback correction factor setting means 2 sets a feedback correction factor alpha based on the deviation between the output value of an O2 sensor and a reference voltage from a reference voltage setting means 8. The output of the O2 sensor is inputted into a level judging means 6 and, when the output of the O2 sensor is, e.g., 450 mV or above, the level judging means 6 sets a reference voltage at 750 mV which is slightly lower than the maximum value of the output of the O2 sensor and, after 1 mS at which the output of the O2 sensor is lowered to 200 mV or below, the reference voltage is set at 200 mV which is slightly higher than the minimum value of the output of the O2 sensor.
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