| Abstract
| - Hybrid-electric transit buses offer potential benefits over conventional transit buses ofcomparable capacity, including reduced fuel consumption, reduced emissions, and the utilizationof smaller engines. Emissions measurements were performed on a 1998 New Flyer 40-foot transitbus equipped with a Cummins ISB 5.9-L diesel engine, an Engelhard DPX catalyzed particulatefilter, and an Allison series-drive system. Results were compared to a conventional-drive, diesel-powered bus that was equipped with an oxidation catalyst, and to a liquefied natural gas (LNG)-powered bus. Tests were performed according to the guidelines of SAE Recommended PracticeJ2711. On average, the oxides of nitrogen (NOx) emissions from the hybrid bus were reduced by50%, compared to the conventional-drive diesel bus, and 10%, compared to the LNG bus.Particulate matter (PM) emissions from the catalyzed filter-equipped hybrid bus were reducedby 90%, relative to those of the conventional diesel bus, and were comparable to those of theLNG bus.
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