METHOD OF DETERMINING CONTENT OF ETHANOL IN FUEL USING AN OXYGEN SENSOR (EMBODIMENTS)

摘要

Methods are provided for accurately learning part-to-part variability of an intake or exhaust oxygen sensor. A correction factor is learned based on sensor readings at voltages above and below a voltage corresponding to dry air conditions. An ethanol transfer function is then adjusted based on the learned correction factor so as to improve the accuracy of combusted fuel ethanol content estimation.