Simultaneous estimation of soot and diesel contamination in engine oil using electrochemical impedance spectroscopy
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- 作者：Christian Ulrich ; Henrik Petersson ; Hans Sundgren ; Fredrik Bjö ; refors ; Christina Krantz-Rü ; lcker
- 关键词：Electrochemical impedance spectroscopy ; Multivariate data analysis ; Engine oil ; Diesel ; Soot
- 刊名：Sensors and Actuators B: Chemical
- 出版年：2007
- 出版时间：15 November 2007
- 年：2007
- 卷：127
- 期：2
- 页码：613-618
- 全文大小：729 K
文摘
In this paper, we explore the combination of electrochemical impedance spectroscopy and multivariate data analysis to simultaneously predict the concentrations of soot and diesel in engine oil. For this purpose, we use a well defined measurement set-up to minimize interference from ambient noise, and to obtain a large amount of data in a short period of time. An imperative requirement is that soot and diesel affect the impedance in different ways over the employed frequency range. It was, for example, found that diesel had a larger influence at lower frequencies. Using partial least squares modelling we show that it is possible to simultaneously predict the concentrations of both soot and diesel in engine oil. Since the temperature in an engine varies, the influence of the oil temperature is investigated in a preliminary experiment. This study is a part of the development of an electrochemical on-board sensor for real-time monitoring of engine oil.