| 摘要 |
PURPOSE:To prevent the deterioration of an exhaust composition accompanying the secular change of an O2 sensor by setting a judgment reference value to be compared with the output of said O2 sensor based on engine speed and cooling water temp., in an air-fuel ratio feedback controlling device. CONSTITUTION:A control unit 12 operates a fundamental injection quantity from an intake air quantity and engine speed, based on the outputs of an air flow meter 7 and a crank angle sensor 9. It also operates an actual injection quantity based on the outputs of an O2 sensor 11 and a water temp. sensor 10, and carries out feedback control so as to obtain a theoretical air-fuel ratio in accordance with an operating condition. And, the control unit 12 sets a reference value for judging whether an air-fuel ratio is on a rich side or a lean side being compared with the output of the O2 sensor 11, based on the engine speed and the cooling water temp.
|
