| 摘要 |
PURPOSE: An air-fuel ration control apparatus using a double oxygen sensor is provided to control the air-fuel ratio by measuring an amount of oxygen accurately, using the double oxygen sensor for sensing the amount of the oxygen in the atmosphere. CONSTITUTION: An air-fuel ratio control apparatus using a double oxygen sensor is composed of an engine state sensing unit for sensing the amount of the intake air and the load and outputting the electrical signal accordingly, an amount of oxygen-sensing unit for sensing the amount of oxygen from the upstream and downstream of an exhaust manifold, a control unit, and a fuel supply unit for providing the fuel with adjusting the air-fuel ratio with respect to signals from the control unit. The engine state sensing unit comprises an intake air-sensing unit for sensing the amount of the intake air and a load-sensing unit for sensing the signal related to the load. The control unit determines the whether the air-fuel control is performed or not with the signal from the engine state sensing unit. When the air-fuel control is performed, the control unit outputs the air-fuel control signal with respect to the upstream oxygen signal and the downstream oxygen signal from the amount of oxygen-sensing unit.
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