Prediction of IM240 Mass Emissions Using Portable Exhaust Analyzers

Publication Date

4-1996

Document Type

Article

Organizational Units

College of Natural Science and Mathematics, Chemistry and Biochemistry

Keywords

Atmospheric chemistry, Emissions, Pollutants

Abstract

Inspection and maintenance programs for motor vehicles in the United States increasingly use loaded mode mass emissions testing (IM240). A method was developed to predict mass emission rates and mass emission changes, particularly from repair benefits, using a low-cost, portable four-gas non-dispersive infrared (NDIR) vehicle exhaust gas analyzer. A single vehicle was tested several times with the analyzer while on the dynamometer and undergoing successive repairs. Excellent correlations for CO and HC were observed. Five vehicles were measured using an on-road driving loop before and after emissions-related repairs, while another three vehicles were tested with no repairs performed. The on-road concentration data used to guide the repair process were converted to grams per gallon; when divided by estimated miles per gallon, this gave grams per mile emissions for comparison to IM240. Correlation coefficients (r2) of 0.87 for CO and 0.76 for HC were achieved for the 13 tests. The linear correlations between IM240 and emissions measured by this method would allow repair facilities to perform a relatively inexpensive test for diagnostic purposes and to estimate repair effectiveness without the need for a dynamometer.

Copyright Statement / License for Reuse

All Rights Reserved
All Rights Reserved.

Copyright Date

4-1-1996

Rights Holder

Air & Waste Management Association

Provenance

Received from author

Language

English (eng)

Extent

6 pgs

Publication Statement

Copyright is held by the Air & Waste Management Association. User is responsible for all copyright compliance.

Publication Title

Journal of the Air & Waste Management Association

Volume

46

Issue

4

First Page

343

Last Page

348

ISSN

2162-2906

This document is currently not available here.



Share

COinS