Engine Oil Condition Monitoring

A. Agoston, C. Otsch, B. Jacoby, Viscosity sensors for engine oil condition monitoring—application and interpretation of results. Sens. Act. A, Physical, 2005,121, pp. 327-332. 

Lee HS, Wang S, Smolenski D, Viola M, Klusendorf E (1994) In situ monitoring of high-temperature degraded engine oil condition with microsensors. Sens Actuators B 20 49-54. doi 10.1016/0925-4005(93)01168-4... 

Miller, J. L. and Kitaljevich, D., In-Line Oil Debris Monitor for Aircraft Engine Condition Assessment Aerospace Conference Proceedings , 2000 IEEE, Vol. 6, pp. 49-56. 

Spectroraetric oil analysis has been applied for more than 40 years as a routine and cost-effective condition monitoring technique [1]. It is used to determine the elemental concentration in parts per million of wear metals, contaminants, and additives in a used oil sample. Commercial oil analysis laboratories report on as many as 20 different elements. With the knowledge of the wear metal and contaminant limits for the machine or engine being monitored, a determination may be made as to whether or not that equipment is operating properly. 

Humphrey, G. R. Filter Debris Analysis by Energy Dispersive X-Ray Fluorescence Applied to J52 Engines, Joint Oil Analysis Program International Condition Monitoring Conference, Pensacola, FL, April 18-22, 2004. 

Electrochemical Sensors for Monitoring Conditions of Lubricants, Table 1 Engine oil problems and... 

Ferrography is a technique that provides microscopic examination and analysis of particles separated from fluids. Developed in the early 1970s as a predictive maintenance technique, it was initially used to precipitate ferrous wear particles from lubricating oils magnetically. This technique was used successfully to monitor the condition of military aircraft engines. That success has led to the development of other applications, including testing of fluids used in vacuum pumps within the semiconductor industry. 

The difficulty to monitor the start sequence using the indicators is due to the fact that their values do not depend only on the engine degradation state. They vary also with operating conditions such as external temperature, atmospheric pressure or oil temperature. 

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