Determining quality of lubricating oils in use

Details Determining quality of lubricating oils in use Determining quality of lubricating oils in use

2008-05-13

2008-05-13

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Lubricant testing

Reexamination Certificate

active

07370514

ABSTRACT:
Resistivity ρ values of a lubricating oil are repeatedly determined at a predetermined temperature (range) as it is in use in a working mechanism such as a vehicle engine. Such accumulated properties over operating time of the working lubricant can be plotted graphically to display a curve with, for example, a first portion where dρ/dt>0, a maximum ρmaxat a time t1where dρ/dt=0, a second portion where dρ/dt<0, a minimum ρminat a time t2where dρ/dt again is zero, and a third portion where dρ/dt>0. Furthermore, there can exist another time t3, where dρ/dt exhibits a discontinuous change (increase) with time. Characteristics of the ρ vs. t curve, including, the values of t1, t2, t3, ρmax, ρmin, and the ratio ρmax/ρmincan be compared with like data on like lubricant oils in estimating the remaining useful life of the present operating lubricant oil.

REFERENCES:
patent: 6810717 (2004-11-01), Heremans et al.
patent: 2003/0222656 (2003-12-01), Phillips et al.
patent: 2005/0035755 (2005-02-01), Schilowitz et al.
patent: 2005/0104607 (2005-05-01), Byington et al.

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