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International Journal of Automotive Technology > Volume 7(4); 2006 > Article
International Journal of Automotive Technology 2006;7(4): 385-390.
MEASUREMENT OF CO2 CONCENTRATION AND A/F RATIO USING FAST NDIR ANALYZER ON TRANSIENT CONDITION OF SI ENGINE
S. W. LEE, W. S. KIM, J. H. LEE, J. I. PARK, J. S. YOO
Ajou University
ABSTRACT
A fast response CO2 analyzer has been developed to study transient characteristics on an SI engine. The analyzer has the delay time of 4.5 ms and time constant of 2.8 ms, which is fast enough to measure CO2 concentration on a transient condition. Wide range of A/F (Air/Fuel) ratio can be estimated using the analyzer with an additional switch type oxygen sensor. The results of measurement of CO2 concentration and A/F ratio on a transient condition including rapid acceleration/deceleration and EGR (Ehxaust Gas Recirculation) on/off are presented and compared with a commercial exhaust gas analyzer and UEGO (Universial Exhaust Gas Oxyzen) sensor.
Key Words: FRNDIR (Fast Response NDIR), NDIR (Non-Dispersive Infrared), CO2 concentration, A/F ratio, Transient condition
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