SYSTEM AND METHOD FOR REDUCING ENGINE OIL DILUTION

摘要

Methods and systems are provided for modeling an oil dilution qualitative indicator based on an integrated difference between a commanded air-to-fuel ratio and an engine air-to-fuel ratio as determined via an oxygen sensor, cumulative cold engine temperature operating duration, and fuel injection characteristics (timing, duration, number of injections) allowing fuel injection timing modifications that minimize oil dilution when the oil dilution qualitative indicator is greater than a threshold level.

主权项

1. A method for a vehicle engine, comprising:
advancing a fuel injection timing with respect to a base fuel injection timing in a first combustion cycle to reduce oil dilution in response to an oil dilution amount greater than a threshold dilution amount, and wherein the base fuel injection timing is applied when the oil dilution amount is less than the threshold dilution amount.