Method for on-line fuel-dilution monitoring of engine lubricant
First Claim
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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Accused Products
Abstract
A method for determining a fuel-dilution condition of a lubricant used in transportation and industrial equipment. The method uses apparatus that applies a high frequency and optionally a low frequency oscillating signal to electrodes immersed in the fluid and quantifies fluid response to the signals. Apparatus can further include means to control the lubricant temperature, or a temperature sensor to monitor the lubricant temperature at the electrodes. The method monitors response of the lubricant to the applied electrical signals and determines ratios of lubricant properties. The high-frequency lubricant property ratio or change of high frequency lubricant property as a function of a lubricant use-measure is compared to a predicted ratio based on lubricant use and an estimate of the lubricant'"'"'s fuel dilution determined. The optional low-frequency lubricant property ratio is compared to thresholds to determine when the lubricant loses the ability to control fuel dilution. The method outputs information relevant to the fuel-dilution condition of the lubricant.
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Citations
25 Claims
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1. A method for determining the fuel-dilution condition of a lubricant comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An apparatus that monitors and detects the fuel-dilution condition of a lubricant comprising:
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a. applying a high-frequency voltage signal between electrodes immersed in a fluid, b. measuring a lubricant 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 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 a fuel content of the lubricant, wherein each step is conducted continuously, intermittently, repeatedly and combinations thereof. - View Dependent Claims (25)
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Specification