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I/M Effectiveness with Today's Closed Loop Systems
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 01, 1987 by SAE International in United States
Annotation ability available
Analysis of today's closed loop systems shows in-use emission levels - measured using the Federal Test Procedure - greatly reduced from those of vehicles produced in the mid ‘70s. The tailpipe concentration measurements (idle tests) used in I/M programs do not correlate well with in-use emissions from today's vehicles.
I/M tests are not very effective in identifying emission failures and are costly compared to other control strategies. Additionally, I/M programs which do not include adequate vehicle preconditioning increase the number of false failures and cause unnecessary expense. A majority of today's closed loop vehicles have on-board diagnostic systems to identify failures. Interrogating these on-board diagnostic systems, together with parameter inspections, offers a more effective alternative to current I/M programs.
- Harold M. Haskew - Powertrain Control Center, Current Product Engineering, General Motors Corporation
- James J. Gumbleton - Powertrain Control Center, Current Product Engineering, General Motors Corporation
- David P. Garrett - Powertrain Control Center, Current Product Engineering, General Motors Corporation
CitationHaskew, H., Gumbleton, J., and Garrett, D., "I/M Effectiveness with Today's Closed Loop Systems," SAE Technical Paper 871103, 1987, https://doi.org/10.4271/871103.
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