| 摘要 |
PURPOSE: A method for controlling the air-fuel ratio of an engine is provided to maximize the purifying efficiency of a catalytic regardless of the operating condition of the engine by controlling the period of air-fuel ratio vibration by a P-gain. CONSTITUTION: A method for controlling the air-fuel ratio of an engine comprises the step of: initializing all of used variables if power supply is applied to a vehicle(S100); receiving a signal from an oxygen sensor if the engine is started(S110); filtering the signal(S120); measuring the vibration of the air-fuel ratio by using the filtered signal(S130); and controlling the period of air-fuel ratio by the measured vibration of the air-fuel ratio(S140).
|
