Engine variable oil pump diagnostic method
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United States of America Patent
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Dec 15, 2020
Grant Date -
Apr 25, 2019
app pub date -
Oct 24, 2017
filing date -
Oct 24, 2017
priority date (Note) -
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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.
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