| 摘要 |
PURPOSE:To surely prevent an engine from fluctuating in rotation or from stalling, by providing a control circuit with a control means for forcibly returning an air-fuel ratio compensation value to a prescribed value if the compensation value has reached a predetermined thickness limit. CONSTITUTION:An air-fuel ratio controller comprises an exhaust sensor 10 provided in an exhaust system, a control circuit 2, which determines a compensation value for the air-fuel ratio in a carburetor on the basis of the output signal of the exhaust sensor 10, and a control valve 6 for regulating the flow rate of fuel. The control circuit 2 includes a control means 26 for forcibly returning the air-fuel ratio compensation value to a prescribed value if the compensation value has reached a prescribed thickness limit. As a result, the air-fuel ratio is kept from becoming too high or low, to surely prevent an engine from fluctuating in rotation or from stalling. |
