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Method for on-line fuel-dilution monitoring of engine lubricant

  • US 20060229776A1
  • Filed: 04/08/2005
  • Published: 10/12/2006
  • Est. Priority Date: 04/08/2005
  • Status: Active Grant
First Claim
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1. A method for determining the fuel-dilution condition of a lubricant comprising:

  • a. applying a high-frequency voltage signal between electrodes immersed in a fluid, b. measuring the lubricant dependent response to the applied high-frequency signal and determining a ratio of a high-frequency lubricant property to the high-frequency property when the lubricant is fresh, and c. comparing at least one of the following properties selected from the group consisting of the determined high-frequency lubricant property ratio to a ratio predicted based on use since the lubricant was fresh, a change in the determined high-frequency lubricant property ratio as a function of use to a change predicted use-based change, and combination thereof, to estimate the fuel content of the lubricant, wherein each step is conducted continuously, intermittently, repeatedly and combinations thereof.

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