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The processes of degradation of engine oils operated in passenger cars of a uniform fleet of 25 vehicles were analyzed for oxidation content using infrared (IR) spectroscopy. As part of the experiment, the changes in engine oils occurring during actual operation (under conditions which can be described as "harsh", i.e., short distance driving, frequent starting of the engine, and extended engine idling) have been observed. An evaluation of the Fourier transform infrared spectroscopy (FTIR) spectrum of an engine oil sample was presented. The infrared spectra of both fresh and used oils were recorded with the Thermo Nicolett IS5. The tests were conducted according to the Appendix A2 of ASTM 2412. For the used engine oil differentiation process, FTIR spectra were analyzed in the regions of 1,700-2,000 cm−1 and 3,600-3,700 cm−1. The FTIR spectrometry is demonstrated to be effective for the analysis and monitoring of processes of oxidation and shown to provide rapid and accurate information relating to the aging process of engine oils. The results may facilitate decision-making regarding the service life of engine oils. The achieved dependencies can make it possible to upgrade the sensor assembly consisting of an FTIR source.


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FTIR analysis and monitoring of used synthetic oils operated under similar driving conditions

Show Author's information Artur WOLAK1( )Wojciech KRASODOMSKI2Grzegorz ZAJĄC3
Department of Quality and Safety of Industrial Products, Institute of Quality and Product Management Sciences, Cracow University of Economics, Kraków 30-033, Poland
Department of of Petroleum Analyses, Oil and Gas Institute—National Research Institute, Kraków 31-503, Poland
Department of Power Engineering and Transportation, Faculty of Production Engineering, University of Life Sciences in Lublin, Lublin 20-612, Poland

Abstract

The processes of degradation of engine oils operated in passenger cars of a uniform fleet of 25 vehicles were analyzed for oxidation content using infrared (IR) spectroscopy. As part of the experiment, the changes in engine oils occurring during actual operation (under conditions which can be described as "harsh", i.e., short distance driving, frequent starting of the engine, and extended engine idling) have been observed. An evaluation of the Fourier transform infrared spectroscopy (FTIR) spectrum of an engine oil sample was presented. The infrared spectra of both fresh and used oils were recorded with the Thermo Nicolett IS5. The tests were conducted according to the Appendix A2 of ASTM 2412. For the used engine oil differentiation process, FTIR spectra were analyzed in the regions of 1,700-2,000 cm−1 and 3,600-3,700 cm−1. The FTIR spectrometry is demonstrated to be effective for the analysis and monitoring of processes of oxidation and shown to provide rapid and accurate information relating to the aging process of engine oils. The results may facilitate decision-making regarding the service life of engine oils. The achieved dependencies can make it possible to upgrade the sensor assembly consisting of an FTIR source.

Keywords: Fourier transform infrared spectroscopy (FTIR), reliability, modelling, oil condition monitoring, oil oxidation, oil change interval

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Publication history
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Publication history

Received: 31 October 2019
Accepted: 19 November 2019
Published: 15 June 2020
Issue date: October 2020

Copyright

© The author(s) 2019

Acknowledgements

The publication was funded by appropriations of the Faculty of Production Engineering University of Life Sciences in Lublin, and the Faculty of Commodity Science, Cracow University of Economics, within the framework of grants to maintain the research potential. All laboratory tests for this study were conducted at the Oil and Gas Institute in Kraków—the National Research Institute.

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