Viscosity detection using sump
First Claim
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1. A method for controlling an engine, comprising:
- after engine shutdown, learning engine oil viscosity based on time to drain oil back into an engine sump and oil temperature during said draining; and
correcting an engine operating parameter based on said learned oil viscosity, said engine operating parameter comprising a throttle plate controlled by an engine controller for controlling air inducted into the engine.
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Abstract
Various methods for inferring oil viscosity and/or oil viscosity index in an internal combustion engine are provided. In one aspect, a new control method comprises: after engine shutdown, learning engine oil viscosity based on time to drain the oil back into an engine sump and oil temperature during the draining, and correcting an engine operating parameter based on the learned oil viscosity.
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Citations
19 Claims
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1. A method for controlling an engine, comprising:
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after engine shutdown, learning engine oil viscosity based on time to drain oil back into an engine sump and oil temperature during said draining; and correcting an engine operating parameter based on said learned oil viscosity, said engine operating parameter comprising a throttle plate controlled by an engine controller for controlling air inducted into the engine. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for controlling an engine, comprising:
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after engine shutdown, learning oil viscosity of engine oil based on temperature of said oil and time to drain said oil back into an engine sump; after at least two of said engine shutdowns at different temperatures, learning viscosity index of said oil from at least two of said learned oil viscosities and temperatures; and correcting an engine operating parameter based on current temperature of said oil and said viscosity index of said oil. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for controlling an engine, comprising:
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after engine shutdown, learning oil viscosity of engine oil based on temperature of said oil and time to drain said oil back into an engine sump; after at least two of said engine shutdowns at different temperatures, learning viscosity index of said oil from at least two of said learned oil viscosities; controlling engine idle speed by first determining an initial throttle position based on a desired idle speed and an assumed oil viscosity; and correcting said initial throttle position based upon said learned viscosity index and present oil temperature. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification