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US 10,865,670 B2Granted
Engine variable oil pump diagnostic method
AssigneeFord Global Technologies, LLC
InventorAed M. Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for indicating degradation of a variable displacement oil pump. In one example, an engine method comprises indicating degradation of the oil pump based on a fuel usage change of the engine, responsive to a commanded change in displacement of the variable oil pump. In response to an indicated degradation, engine wear may be avoided and fuel economy may be improved by adjusting engine operation.
Claims8
A method for an engine of a vehicle, comprising:
- indicating a variable displacement oil pump is stuck in a low displacement mode based on a change in fuel economy of the engine being less than a threshold change following a commanded change in displacement of the oil pump, and further based on an average fuel economy following the commanded change in displacement being substantially equal to a baseline fuel economy;
- and
- increasing a commanded engine idle speed based on the indication that the oil pump is stuck in the low displacement mode.
Dependencies are inferred from the claim text.