Method of estimating engine lubricant condition

Details Method of estimating engine lubricant condition Method of estimating engine lubricant condition

2005-07-26

2005-07-26

Raevis, Robert (Department: 2856)

Measuring and testing

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

Lubricant testing

C073S117020, C340S457400

Reexamination Certificate

active

06920779

ABSTRACT:
A motor vehicle having an internal combustion engine and a lubricating oil circulation system provides estimates of the distance remaining before an oil change becomes imperative. An indirect estimate of the depletion of various additives and the deterioration of oil operating characteristics is based on engine operating variables including oil temperature, ignition timing and engine load. The limit of depletion of total base number is dynamic, since it is set against total acid number and the two figures are independently calculated.

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