Model-based method of estimating crankcase oil temperature in an internal combustion engine
AssigneeDelphi Technologies, Inc.
InventorsJeffrey M. Pfeiffer, Joon-Ho Yoo
Life of this patent
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Abstract
An improved method of estimating the oil temperature of an internal combustion engine models the net heat flow through the oil during operation of the engine based on known engine operating parameters and integrates the net heat flow to update the oil temperature estimate. The net heat flow components include heat added to the oil due to fuel combustion and heat rejected from the oil to the engine coolant and atmospheric air, and are based on heat transfer coefficients that are adjusted to take into account variations in engine speed, vehicle speed and cooling fan operation.
Claims10
A method of estimating a temperature of crankcase oil in an internal combustion engine, comprising the steps of:
- determining an initial estimate of the oil temperature at engine start-up based on a duration of engine inactivity prior to said engine start-up;
- modeling a net heat flow through the oil during operation of the engine after start-up;
- and
- periodically determining a new estimate of the oil temperature based on the initial estimate and the modeled net heat flow.
Dependencies are inferred from the claim text.