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Detecting soot during real time operation in diesel engine lubricant

一种柴油发动机、实时运行的技术，应用在润滑零部件、润滑指示装置、测量装置等方向，能够解决无法监测柴油发动机润滑剂炭黑等问题

Inactive Publication Date: 2005-02-09
EATON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the impedance spectroscopy analysis algorithm in the above patent cannot monitor carbon black in diesel engine lubricants

Method used

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  • Detecting soot during real time operation in diesel engine lubricant
  • Detecting soot during real time operation in diesel engine lubricant
  • Detecting soot during real time operation in diesel engine lubricant

Examples

Experimental program
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Embodiment Construction

[0011] The system of the present invention, generally designated 10, includes a probe 12 inserted into the crankcase or oil pan of a diesel engine 14, indicated generally at 16, at the oil level. The electrodes of the probe can be of any suitable configuration; but in the present invention a pair of figure 1 Concentric tubular electrodes of concentric tubular structures represented by reference numbers 11 and 13. For the structure of the probe, see the application date assigned to the applicant as January 31, 2002, entitled "Probe Assembly For Fluid Condition Monitor And Method Of Making Same (probe assembly for fluid state monitoring and its manufacturing method)" Pending Publication No. 10 / 060,107.

[0012] One electrode of probe 12 is supplied with a lower voltage AC current via lead 18 from a controller 20 which may include an oscillator and microprocessor to provide the lower voltage AC current to the probe. The measured probe current is transmitted to an electrical sig...

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Abstract

A probe having a pair of closely spaced electrodes is immersed in the lubricant and one electrode is excited with a relatively low voltage AC current. The frequency is swept over a range of about 1 - 10,000 Hertz and the current and phase angle measured at selected frequency intervals. The reactive (Z') and resistive (Z') impedances are computed for each current measurement and values of Z' plotted as a function of Z' as a Nyquist plot. The center of curvature of the plot between the origin and the minimum value of Z' is located; and, the angle of depression of a line from the origin through the center of curvature THETA is determined from the plot. Samples of lubricant having known concentration of soot are measured and the angle THETA determined for each sample. The angle is then plotted as a function of soot concentration and a smooth curve fitted to the data plots. The curve may be programmed into a microcomputer to be used with the sensor for real time determination of soot concentration.

Description

technical field [0001] The present invention relates to the detection of accumulation of carbon black or soot particles in diesel engine (diesel) lubricants. Background technique [0002] It has been found that recent reductions in mandatory limits on vehicle engine exhaust emissions require the fitting of diesel engines with the use of exhaust gas recirculation (EGR) valves to dilute the fuel-to-air fuel ratio. This results in a change in combustion chemistry and an increased rate of soot accumulation that blows over the engine piston rings and contaminates the engine lubricating oil. [0003] Engine lubricants cannot function properly when soot concentrations exceed a threshold, and the engine is quickly damaged. [0004] Previously, laboratory methods were used to determine the concentration of carbon black in engine lubricants, which required sending samples of the engine oil to the laboratory for thermogravimetric analysis or using optical methods such as Fourier trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/02F01M11/10G01N33/28G01R27/26
CPCG01N27/02G01N33/2888
Inventor C·J·克勒R·W·希尔斯M·A·塞茨
Owner EATON CORP
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