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Development of a Fast-Response $CO_2$ Analyzer using NDIR Technique and Its Application to SI Engine  

Lee, Jae-Young (School of Mechanical and Aerospace Engineering, Seoul National University)
Min, Kyoung-Doug (School of Mechanical and Aerospace Engineering, Seoul National University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.15, no.6, 2007 , pp. 102-107 More about this Journal
Abstract
A fast response $CO_2$ ($fCO_2$) analyzer for real-time measurement of carbon dioxide concentration during transient states of internal combustion engines has been developed. This analyzer uses non-dispersive infrared absorption (NDIR) technique for measuring $CO_2$ concentration and Kalman filter for removing noise components from output signals. The analyzer has good linearity, repeatability and drift with a response time of 11 ms; it is sufficiently fast to detect $CO_2$ concentration during transient states of internal combustion engines. The $fCO_2$ analyzer was used to measure transient $CO_2$ concentration of exhaust gas of the SI engine with a standard gas analyzer, and the signal of the $fCO_2$ analyzer was compared to that of the standard gas analyzer. The two concentrations were well matched during the steady state, and the $fCO_2$ analyzer could measure the variations of $CO_2$ concentration during the transient state.
Keywords
Transient-state; Fast-response$CO_2$ concentration; Kalman filter; Non-dispersive infrared absorption;
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