System and method of engine calibration

摘要

The open loop calibration of the fuel delivery system of an internal combustion engine is recalibrated based on the response of the engine idle speed as the air/fuel ratio of the air and fuel mixture supplied to the engine is varied. When the engine is at idle, the air/fuel ratio of the mixture supplied to the engine is decreased until a peak engine idle speed is detected. Thereafter, the air/fuel ratio of the mixture is increased until the engine speed decreases from the detected peak value by an amount corresponding to the desired value of a controlled parameter such as the amount of CO in the exhaust gases.