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Resumen

 

A METHOD TO CORRECT MEASURED METALLIC CONCENTRATIONS IN USED OIL SAMPLES

METODO PARA CORREGIR LAS CONCENTRACIONES METALICAS MEDIDAS EN MUESTRAS DE ACEITE
PhD. Simón J. Fygueroa Salgado.
MSc. Juan C. Serrano Rico.
MSc. Gonzalo G. Moreno Contreras.

Abstract: In engines diagnostic thru oil analysis, used oil samples are taken and a set of analysis to quantify symptoms such as contaminant concentrations and oil properties, are done. Contaminant concentrations are obtained in a spectrometer but its results do not characterize engine wear if they are not manipulate in a suitable way, so they don’t generate wrong information on its condition. Present work expose a method to correct spectrometric analysis results by considering the main factors that can influence oil metallic concentrations: engine and oil service time, oil refill, oil consumption, crankcase volume and oil composition. Proposed method is based on an oil contamination model which consider exponential contamination speed and homogenous and instantaneous lube mixing.

Resumen: En el diagnóstico de motores mediante análisis del aceite, se toman muestras del lubricante usado que se someten a una serie de análisis para cuantificar síntomas tales como las concentraciones de contaminantes y las propiedades del aceite. Los valores de las concentraciones se determinan por medición espectrométrica pero sus resultados no caracterizan el desgaste del motor del que provienen si no se tratan de manera adecuada, pudiendo producir falsas interpretaciones sobre su estado. En el presente trabajo se expone un método para corregir los resultados obtenidos por el análisis espectrométrico teniendo en cuenta los principales factores que pueden influir sobre las concentraciones de los contaminantes metálicos del aceite como son: el tiempo de funcionamiento del motor y el de uso del aceite, los añadidos y el consumo de lubricante, la capacidad del deposito y la composición del aceite. El método se basa en un modelo de contaminación del aceite con velocidad de contaminación exponencial y mezcla del lubricante homogénea e instantánea.

Keywords: Predictive maintenance, fault diagnosis, oil analysis, condition monitoring, internal combustion engines.