In the report the authors describe a test program designed to give preliminary answers to the questions: (1) Is there a benefit of identifying the emissions problems of vehicles with the OBD system and how does it compare to the available tailpipe tests? (2) Will OBD pass any vehicles which are emitting at levels that are of concern in I/M? A total of 201 vehicles qualified for this program, 194 with the MIL illuminated and 7 high emitters with no MIL illumination. After testing these vehicles we concluded that: (1) OBD technology is a viable I/M test for 1996 and newer vehicles. The emission reductions available from basing repairs on OBD appear to be at least as large and possibly larger than emission reductions obtained from I/M tailpipe tests. (2) OBD did miss some high emitters but performed better than available I/M tailpipe tests. (3) Some areas of OBD technology still need to be refined and the vehicles with OBD technology should be monitored for the effect of aging. (4) OBD I/M offers preventative maintenance which allows benefits previously unavailable to I/M programs to be claimed.
Evaluation of On Board Diagnostics for Use In Detecting Malfunctioning and High Emitting Vehicles
2000
38 pages
Report
Keine Angabe
Englisch
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