Data processing: measuring – calibrating – or testing – Measurement system – Performance or efficiency evaluation
Reexamination Certificate
2006-05-09
2006-05-09
Wachsman, Hal (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system
Performance or efficiency evaluation
C702S050000, C702S064000, C702S065000, C324S605000, C324S600000
Reexamination Certificate
active
07043402
ABSTRACT:
An on-line sensing system and method for monitoring in real-time thermal-oxidative breakdown, water contamination, and/or fuel dilution conditions in operational engine lubricating oils. The method of the invention includes an electrochemical impedance analysis technique specific to the particular oil to be monitored. Sensing devices having of at least two electrodes are configured for direct installation in an existing access port, or drain port, of a lubricating oil reservoir. An AC voltage waveform is applied to the sensing device (preferably less than 100 Hz) to produce voltage and current responses between the appropriate electrodes contacting the oil. The magnitude impedance |Z| and phase angle components of the complex impedance are used to characterize the quality and/or condition of the engine oil under test. The system also provides an electrical indication indicative of the percentage remaining useful life of the oil.
REFERENCES:
patent: 4646070 (1987-02-01), Yasuhara et al.
patent: 4701713 (1987-10-01), Eaton et al.
patent: 4719441 (1988-01-01), Horn
patent: 4733556 (1988-03-01), Meitzler et al.
patent: 4742476 (1988-05-01), Schwartz et al.
patent: 4847768 (1989-07-01), Schwartz et al.
patent: 5071527 (1991-12-01), Kauffman
patent: 5200027 (1993-04-01), Lee et al.
patent: 5274335 (1993-12-01), Wang et al.
patent: 5540086 (1996-07-01), Park et al.
patent: 6028433 (2000-02-01), Cheiky-Zelina et al.
patent: 6255954 (2001-07-01), Brown et al.
patent: 6268737 (2001-07-01), Marszalek
patent: 6377052 (2002-04-01), McGinnis et al.
patent: 6459995 (2002-10-01), Collister
patent: 6577112 (2003-06-01), Lvovich et al.
On-Line System for Lubrication Diagnostics by Heiner Kaden, Wolfgang Fichtner and Kristina Ahlborn; MTZ Worldwide; pp. 8-11, no date.
In-situ Oil Condition Monitoring in Passenger Cars; Lee, Wang, and Smolenski; Lubrication Engineering 50, 8, 605-611, Nov. 1993.
In-Situ Monitoring of High Temperature Degraded Engine Oil Condition w/ Microsensors; Lee, Wang, and Smolenski; Sensor and Actuators B 20 (1994) 49-54, no month.
An Electrochemical Technique for Characterizing Metal-Lubricant Interfacial Reactions; Wang, Maheswari, and Tung; ASLE Transactions 30, 3, 394-402, no date.
AC Impedance Measurements of the Resistance and Capacitance of Lubricants; Wang, Maheswari, and Tung; ASLE Transactions 30, 4, pp. 436-439, 441-443, no date.
Using Electrochemical and Spectroscopic Techniques as Probes for Investigating Metal-Lubricant Interactions; Wang and Tung; Tribology Transactions 33 (1990), 4, 563-572.
A Sensor for Glycol C ntamination in Oil; Wang and Lee; Proc. of Journal of Electroch mical Soci ty, Abstract 692 (1992), 995-996.
Electr chemical Monitoring f Water-Surfactant Interactions in Industrial Lubricants; Lvovich, V.F.; J. Electroanalytical Society, 534 (2002) 171-180, no month.
Electrical Conductivity Method for Evaluation of Oxidative Degradation of Oil Lubricants; Sato, A. and Oshika, T.; Lubrication Engineering 48 (1991) 539-544.
Additives—The Right Stuff for Automotive Engin Oils; Watson and McDonnell, Jr.; SAE Paper No. 841208, pp. 17-28, Amoco Chemicals Corporation, Naperville, IL, no date.
Change in Performanc of Engine Oils with D gradation; In ue and Yamanaka; SAE Paper No. 902122, pp. 1-10 (1990), Nippon Oil Company, Ltd.
Experimental and Modeling Study of Kinetics and Selectivity in the Oxidation of a PAO Lubricant; Koh, C-S and Butt, J B.; Industrial Engineering Chemistry Research, vol. 34, No. 2, pp. 524-535, 1995, no month.
Water in Oil Analysis for Condition Monitoing; W. J. Leszek; Senior Research Fellow, IM Politechnika Paznanska, 60, 965, pp. 444-447, Poznan, Poland.
Eggers William J.
Pappas Dean
Phillips Alan D.
Rodgers Robert S.
The Precision Instrument Corp.
Wachsman Hal
LandOfFree
On-line oil condition sensor system for rotating and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with On-line oil condition sensor system for rotating and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On-line oil condition sensor system for rotating and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3526789