The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 15, 2005
Filed:
Dec. 04, 2002
Warren Baxter Nicholson, El Paso, TX (US);
Yingjie Lin, El Paso, TX (US);
Larry M. Oberdier, Royal Oak, MI (US);
Joseph Pierre Heremans, Troy, MI (US);
Warren Baxter Nicholson, El Paso, TX (US);
Yingjie Lin, El Paso, TX (US);
Larry M. Oberdier, Royal Oak, MI (US);
Joseph Pierre Heremans, Troy, MI (US);
Delphi Technologies, Inc., Troy, MI (US);
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.