Determination of end of life of oil by electrical means

Details Determination of end of life of oil by electrical means Determination of end of life of oil by electrical means

2009-03-27

2010-11-16

Dunn, Drew A (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

Reexamination Certificate

active

07835875

ABSTRACT:
Electrical measures of resistivity and permittivity of engine lubricating oil are gathered continuously under normal vehicle engine operating conditions and combined into a composite parameter, the aggregated electrical measure, which, is indicative of engine oil condition and when plotted over the useful life of the oil displays a first linear slope anticipatory of the end of oil life followed by a second, steeper slope indicative of the end of oil life. An algorithm, implementable in an on-vehicle computer, to reliably detect these features is described.

REFERENCES:
patent: 6268737 (2001-07-01), Marszalek
patent: 6922064 (2005-07-01), Halalay et al.
patent: 7370514 (2008-05-01), Halalay et al.
patent: 7362110 (2009-03-01), Halalay et al.

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