Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2005-03-15
2005-03-15
Deb, Anjan K. (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S708000, C324S709000, C324S686000
Reexamination Certificate
active
06867603
ABSTRACT:
Soot content in Diesel engine lubrication oil is determined using electrical resistance measurements of the oil at high frequency. A sensor in the form of a capacitor is immersed in the oil, wherein the oil serves as a dielectric between the plates. The capacitance and resistance between the plates change as a function of engine oil condition. An inductor is placed in series with the sensor, and high frequencies are sweeped over a range to find resonance where the capacitive and inductive reactances cancel. At this frequency, the resistance of the oil is measured and the condition of the oil thereby determined.
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Heremans Joseph Pierre
Lin Yingjie
Nicholson Warren Baxter
Oberdier Larry M.
Deb Anjan K.
Delphi Technologies Inc.
Funke Jimmy L.
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