Transient SI Engine Emissions Measurements on the FTP75 Drive Cycle with a Fast Response CO Instrument
Date Published: 2001-09-24
Paper Number:2001-01-3540
DOI: 10.4271/2001-01-3540
Citation:
Hands, T., Peckham, M., Campbell, B., and Sutela, C., "Transient SI Engine Emissions Measurements on the FTP75 Drive Cycle with a Fast Response CO Instrument," SAE Technical Paper 2001-01-3540, 2001, doi:10.4271/2001-01-3540.
This paper describes the application of a non-dispersive infrared-based instrument designed to measure CO with a response time of 7ms. Spark ignition engine emission measurements recorded during the first 505 seconds of an FTP75 drive-cycle for a 4 cylinder engine are presented, including fast response hydrocarbon and NO measurements. An analysis of the engine-out (pre-catalyst) exhaust gas is provided. Data collected simultaneously with a standard emissions test stand and conventional dilution tunnel are compared to the high frequency measurements. Fast CO analysis provides new insight into cold-start fuelling calibration and cylinder-to-cylinder AFR variation. Under rich conditions, the strong dependence of CO production on the quantity of excess fuel allows a significantly faster estimate of engine stoichiometry than a UEGO sensor.
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