Apparatus and method for determining oil change based upon...

Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Lubricant testing

Reexamination Certificate

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C073S054020, C073S117020, C073S054010

Reexamination Certificate

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06901788

ABSTRACT:
An oil change sensing system for an internal combustion engine, having an oil pressure sensor adapted to provide an oil pressure signal to an engine control module; an oil temperature sensor adapted to provide an oil temperature signal to the engine control module; wherein the engine control module comprises an algorithm which determines the oil's viscosity by using the measured oil temperature and oil pressure and the determined oil viscosity and a fresh oil viscosity are used to determine whether the oil is in a preferred operating range.

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S. Manco, Nervegna, M. Rundo, G. Armenio, C. Pachetti and R. Trichilo, Gerotor Lubricating Oil Pump for IC Engines, 1998 Society of Automotive Engineers, Inc., pp. 1-17.

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