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Time Resolved Measurements of Carbon Monoxide in the Exhaust of a Computer Command Controlled Engine
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Abstract
Carbon monoxide concentrations in the exhaust from an engine operated under Computer Command Control were measured with infrared diode laser spectroscopy. CO levels were measured before and after the catalytic converter for various air-fuel ratios, using two different carburetors and using both analog and digital carburetor controllers. The response time of the spectrometer was 0.025 s, which was fast enough to resolve the rapidly varying CO concentrations. Using signal-averaging techniques the CO component was isolated which was due to the modulation of the carburetor's fuel metering rod. A component at the firing frequency of a single cylinder was also isolated; this component results from maldistribution of fuel to the engine's eight cylinders. Fourier transforms of the data yielded relative amplitudes of CO oscillation as a function of frequency.
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Sell, J., Herz, R., and Perry, E., "Time Resolved Measurements of Carbon Monoxide in the Exhaust of a Computer Command Controlled Engine," SAE Technical Paper 810276, 1981, https://doi.org/10.4271/810276.Also In
References
- Canale R. P. Winegarden S. R. Carlson C. R. Miles D. L. “General Motors Phase II Catalyst System,” SAE Transactions , Paper 780205 1979
- Sell J. A. Herz R. K. Monroe D. R. “Dynamic Measurement of Carbon Monoxide Concentration in Automotive Exhaust Using Infrared Diode Laser Spectroscopy,” Paper 800963 presented at SAE Congress and Exposition Detroit February 1980
- Lo W. Swets D. E. “Diffused Homo-junction Lead-Sulfide-Selenide Diode with 140 K Laser Operation,” Appl. Phys. Lett 33 1978