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A Comparison of Dynamic Exhaust Emissions Tests: Chassis Dynamometer versus Engine Dynamometer
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English
Abstract
Exhaust emission tests run on an engine dynamometer are compared with those run on a chassis dynamometer. The worst case average difference between the chassis and engine dynamometer mass emissions, obtained over a period of 6 months, was less than 7%. The elimination of the driver, vehicle, and chassis dynamometer yielded significant improvement in test reproducibility with respect to carbon monoxide and oxides of nitrogen.
A digital computer was used to control speed and throttle position of the engine dynamometer experiments. No transmission was used. The computer and engine dynamometer duplicated transient effects of transmission, vehicle, and chassis dynamometer.
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Cassidy, J., "A Comparison of Dynamic Exhaust Emissions Tests: Chassis Dynamometer versus Engine Dynamometer," SAE Technical Paper 720455, 1972, https://doi.org/10.4271/720455.Also In
References
- Cassidy J. F. Jr. Rillings J. H. “Transient Engine Testing by Computer Control.” SAE Transactions 81 1972 paper 720454
- Stivender D. L. “Development of a Fuel-Based Mass Emission Measurement Procedure.” Paper 710604 SAE International Mid-Year Meeting Montreal, Quebec June 1971
- Stivender D. L. Kim Y. G. “Dynamic Computer Techniques for Vehicle Emission Development.” Paper 720211 SAE Automotive Engineering Congress Detroit January 1972