Condition Monitoring of SI Engine using Virtual Instrumentation

In this book presented the development of a system for monitoring engine lubricants temperature and vibration. The sensor can be integrated into the oil circuit of a engine in order to monitor the condition of the lubricating oil in use. The system works on the principle of non-dispersive infrared absorption measurement and uses a transmission setup consisting of two thin-film infrared emitters and two four-channel pyroelectric detectors. Seven different optical bandpass filters are used to monitor changes in the infrared absorption spectrum of the oil. To select the optical bandpass filters a multivariate regression analysis of the used oil infrared absorption spectra was performed. We performed a ray tracing simulation to analyze and correct the influence of the optical sensor setup on the optical characteristics of the bandpass filters. The sensor prototype was implemented in a rugged aluminum housing to withstand the operating requirements of industrial environments.