Carbon Dioxide (CO2) Tracer Technique for Modal Mass Exhaust Emission Measurement

720126

02/01/1972

Event
1972 Automotive Engineering Congress and Exposition
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/720126
Pages
15
Citation
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.
Additional Details
Publisher
Published
Feb 1, 1972
Product Code
720126
Content Type
Technical Paper
Language
English