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Carbon Dioxide (CO2) Tracer Technique for Modal Mass Exhaust Emission Measurement
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Abstract
The CO2 tracer technique is a method of measuring automotive exhaust mass emissions during arbitrary modes of operation of a car on the 1972 federal emission test driving schedule. This technique allows modal mass measurements of low-emission cars based on undiluted exhaust gas concentrations. The CO2 concentration at the tailpipe is compared with the CO2 in the diluted stream to obtain exhaust flow. This flow, multiplied by tailpipe concentrations of hydrocarbon, carbon monoxide, and nitric oxide, and integrated over the driving mode, gives modal mass emissions. Problems associated with the lag between the time at which a transient maneuver takes place in the engine and the time at which measurements are recorded are also discussed.
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Wiers, W. and Scheffler, C., "Carbon Dioxide (CO2) Tracer Technique for Modal Mass Exhaust Emission Measurement," SAE Technical Paper 720126, 1972, https://doi.org/10.4271/720126.Also In
References
- Department of Health, Education, and Welfare “Control of Air Pollution from New Motor Vehicles and New Motor Vehicle Engines.” Federal Register 35 219 November 10 1970 Washington, D. C.
- Environmental Protection Agency “Exhaust Emission Standards and Test Procedures.” Federal Register 36 128 July 2 1971 Washington, D. C.
- Jackson W. E. Smith A. M. Comments on SAE paper 690523 “Weighing Automotive Exhaust Emissions, by S. H. Mick and J. B. Clark, Jr., June 20, 1969.” Automobile Manufacturers Association, Inc. Memorandum Report, Mass Emission Measurement Liaison Sub-Panel Meeting September 15 1969 Willow Run, Mich. October 1 1969 3 4
- Stivender D. L. “Development of a Fuel Based Mass Emission Measurement Procedure.” Paper 710604 SAE International Mid-Year Meeting Montreal June 1971
- Department of Health, Education, and Welfare “Control of Air Pollution from New Motor Vehicles and New Motor Vehicle Engines.” Federal Register 33 108 June 4 1968 Washington, D.C.
- Jackson M. W. “Fuel Economy from CVS Results.” General Motors Internal Report, Minutes of the March 2, 1971 Engine and Emission Control Systems Subcommittee Instrumentation Group Meeting 4 5