Method of estimating engine lubricant condition
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United States of America Patent
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Jul 26, 2005
Grant Date -
May 20, 2004
app pub date -
Nov 15, 2002
filing date -
Nov 15, 2002
priority date (Note) -
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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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