Fast Response CO2 Sensor for Automotive Exhaust Gas Analysis

Paper #:
  • 1999-01-3477

Published:
  • 1999-10-25
Citation:
Sutela, C., Collings, N., and Hands, T., "Fast Response CO2 Sensor for Automotive Exhaust Gas Analysis," SAE Technical Paper 1999-01-3477, 1999, https://doi.org/10.4271/1999-01-3477.
Pages:
11
Abstract:
A fast response sensor for measuring carbon dioxide concentration has been developed for laboratory research and tested on a spark ignition engine. The sensor uses the well known infra-red absorption technique with a miniaturized detection system and short capillary sampling tubes, giving a time constant of approximately 5 milliseconds; this is sufficiently fast to observe changes in CO2 levels on a cycle-by-cycle basis under normal operating conditions. The sensor is easily located in the exhaust system and operates continuously.The sensor was tested on a standard production four cylinder spark-ignition engine to observe changes in CO2 concentration in exhaust gas under steady state and transient operating conditions. The processed sensor signal was compared to a standard air-to-fuel ratio (AFR) sensor in the exhaust stream and the results are presented here. The high frequency response CO2 measurements give new insights into both engine and catalyst transient operation.
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