System and method for reducing engine oil dilution
AssigneeFord Global Technologies, LLC
InventorsKevin Macfarlane, Dennis Witt, Amanda Perkins, Christopher Semanson, Robert Milton, Charles Irwin Rackmil
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for filtering an oil dilution amount based on a current value of the oil dilution amount. In one example, filtering the oil dilution amount may include decreasing a sensitivity of filtering at lower oil dilution below a threshold; otherwise, increasing the sensitivity of filtering. The sensitivity of the filtering may be decreased by implementing a larger time constant, while the sensitivity of the filtering may be increased by implementing a smaller time constant.
Claims20
A method for a vehicle engine, comprising:
- determining a filtered oil dilution amount by filtering an estimated oil dilution amount of an engine oil;
- and
- indicating oil degradation based on the filtered oil dilution amount;
- wherein an amount of filtering is adjusted based on the estimated oil dilution amount.
A method for an engine, comprising:
- estimating a fuel in oil dilution;
- using the estimated fuel in oil dilution as an input to a filter;
- and
- responsive to the estimated fuel in oil dilution less than a threshold dilution, selecting a first time constant for the filter;
- otherwise, selecting a second time constant for the filter;
- wherein the first time constant is larger than the second time constant.
A method for a vehicle, comprising:
- at a controller within the vehicle,
- estimating an amount of fuel in engine oil based on a number of regeneration events of a particulate filter within an exhaust of the vehicle, a vehicle speed and a vehicle mileage;
- generating a filtered amount of fuel in engine oil by filtering the estimated amount of fuel in engine oil;
- estimating an oil degradation amount based on the filtered amount of fuel in engine oil;
- and
- generating a message to display an oil service interval, the oil service interval based on the oil degradation amount;
- wherein, a sensitivity of the filtering is adjusted based on the estimated amount of fuel in engine oil.
Dependencies are inferred from the claim text.