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US 2016/0102619 A1Published application
Methods and systems for determining a fuel concentration in engine oil using an intake oxygen sensor
AssigneeFord Global Technologies, LLC
InventorsMohannad Hakeem, Gopichandra Surnilla, James Eric Anderson
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for estimating a fuel concentration in engine oil in an engine crankcase. In one example, an engine controller may adjust engine operation such as EGR flow and engine fueling based on the estimated fuel concentration in engine oil. The fuel concentration may be based on an output of an intake oxygen sensor when purge and EGR flow are disabled, engine oil temperature, and fuel composition.
Claims13
A method for an engine, comprising:
- during engine oil warm-up,
- operating with EGR while purging fuel vapors to an engine intake with purge flow disabled at a first frequency;
- and
- in response to a difference between EGR estimated by an oxygen sensor and EGR estimated by a pressure sensor being higher than a threshold, disabling the purge flow at a second, higher frequency.
1 more element
A method for an engine, comprising:
- flowing EGR from an engine exhaust to an engine intake via an EGR valve;
- commanding canister purge flow off at a first frequency;
- determining PCV noise on an intake oxygen sensor while the canister purge flow is off;
- and
- in response to increased PCV noise, disabling EGR and commanding canister purge flow off at a second, higher frequency.
2 more elements
Dependencies are inferred from the claim text.