Temperature compensation method for soot sensor
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United States of America Patent
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Jun 20, 2006
Issued Date -
N/A
app pub date -
Jul 30, 2004
filing date -
Dec 4, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Certain characteristics of Diesel engine lubrication oil are determined. A sensor formed as a capacitor is immersed in the oil. An inductor is in series with the sensor, and a high frequency voltage with a varying frequency is applied to the resonance circuit formed by the inductor and capacitor. Resonance is sensed, and the resonant frequency and/or the resonant current are used to determine the soot content and/or the dielectric constant of the oil. The electronics temperature can be used to compensate for temperature variations in the resonant frequency and the electronics temperature and the oil temperature can be used to compensate for temperature variations in the resonant current. The compensated values are preferably used in the determination of soot content and the dielectric constant.
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