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Prediction of IM240 Mass Emissions Using Portable Exhaust Analyzers.
Paul L Guenther, Donald H Stedman, Jon M Lesko1
1a University of Denver , Denver , Colorado.
Journal of the Air & Waste Management Association (1995)
|January 13, 2017
Summary
A new, portable exhaust gas analyzer can accurately predict vehicle emissions and repair effectiveness. This method offers a low-cost alternative to dynamometer testing for emissions inspection and maintenance programs.
Area of Science:
- Environmental Science
- Automotive Engineering
- Analytical Chemistry
Background:
- Motor vehicle emissions testing is crucial for environmental protection.
- Current loaded mode mass emissions testing (IM240) requires specialized equipment like dynamometers.
- There is a need for cost-effective and portable methods for emissions assessment.
Purpose of the Study:
- To develop and validate a portable NDIR analyzer method for predicting mass emission rates.
- To assess the effectiveness of vehicle emission repairs using this portable analyzer.
- To establish correlations between the portable analyzer measurements and IM240 standards.
Main Methods:
- A portable four-gas non-dispersive infrared (NDIR) analyzer was used to measure exhaust gas concentrations.
- Testing was conducted on a dynamometer with successive repairs and on an on-road driving loop.
- On-road data were converted to grams per mile for comparison with IM240 standards.
Main Results:
- Excellent correlations were observed for CO and HC emissions on the dynamometer.
- On-road measurements showed strong linear correlations with IM240: r²=0.87 for CO and r²=0.76 for HC.
- The portable analyzer effectively predicted mass emission changes from repairs.
Conclusions:
- The developed portable NDIR analyzer method provides a reliable and inexpensive alternative for vehicle emissions testing.
- This method can assist repair facilities in diagnosing issues and estimating repair effectiveness without a dynamometer.
- The findings support the integration of portable analyzers into emissions inspection and maintenance programs.
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