FIELD: internal combustion engines.
SUBSTANCE: various methods for inferring oil viscosity and/or oil viscosity index in an internal combustion engine are provided. In one example, a new control method comprises cranking the engine during a start mode with an electric motor connected to a substantially constant source of electrical power, inferring engine oil viscosity based at least on engine oil temperature and speed of the engine while being cranked by the electric motor during the start mode, and correcting an operating parameter of the engine based on the inferred engine oil viscosity.
EFFECT: invention relates to the control of an engine with varying oil viscosities and their detection.
20 cl, 11 dwg
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