Method for reducing engine oil dilution
AssigneeFord Global Technologies, LLC
InventorsMohannad Hakeem, Shuya Shark Yamada, Gopichandra Surnilla, James Eric Anderson
Life of this patent
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Abstract
Various systems and methods are described for reducing engine oil dilution in a boosted engine. One method comprises, when engine oil dilution is higher than a first threshold and engine oil temperature is below a temperature threshold, adjusting a position of an air induction system (AIS) throttle, generating a vacuum, and providing the vacuum to a crankcase of the boosted engine to enhance fuel evaporation from engine oil. The providing of vacuum may be discontinued when engine oil dilution is lower than the first threshold and/or when engine oil temperature rises above the temperature threshold.
Claims20
A system, comprising:
- an engine with an intake passage;
- a turbocharger with an intake compressor;
- an air induction system (AIS) throttle positioned in the intake passage upstream of the intake compressor;
- a crankcase;
- and
- a controller with computer readable instructions stored in non-transitory memory for:
- during a first condition,
- decreasing an opening of the AIS throttle to reduce pressure in the intake passage;
- and
- applying the reduced pressure to the crankcase to enhance fuel evaporation;
- and during a second condition,
- increasing the opening of the AIS throttle;
- and
- disabling the applying of reduced pressure to the crankcase.
A method for a boosted engine comprising:
- when engine oil dilution is higher than a first threshold and engine oil temperature is below a temperature threshold,
- adjusting a position of an air induction system (AIS) throttle;
- generating a vacuum;
- and
- applying the vacuum to a crankcase to enhance fuel evaporation from engine oil.
A method for a boosted engine, comprising:
- when engine oil temperature is lower than a first threshold,
- decreasing an opening of an air induction system (AIS) throttle if an engine oil dilution is greater than a second threshold;
- and
- increasing the opening of the AIS throttle responsive to a change in an engine operating parameter.
Dependencies are inferred from the claim text.