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Document Number | 9729 |
|---|---|
Primary Title | King County Metro Transit: Allison Hybrid Electric Transit Bus Laboratory Testing |
Author Name | Hayes, R.R.; Williams, A.; Ireland, J.; Walkowicz, K. |
Author Affiliation | National Renewable Energy Laboratory, Golden, Colorado |
Published Date | 09/01/2006 |
Detailed Publish Date | September 2006 |
Page Count | 24 |
Document Type | REPORT |
Abstract | The National Renewable Energy Laboratory's ReFUEL facility conducted chassis dynamometer testing of two 60-foot articulated transit buses, one conventional and one hybrid. Both test vehicles were 2004 New Flyer buses powered by Caterpillar C9 8.8L engines, with the hybrid vehicle incorporating a GM-Allison advanced hybrid electric drivetrain. Both vehicles also incorporated an oxidizing diesel particulate filter. The hybrid vehicle demonstrated the greatest improvement in fuel economy in the low speed, heavy stop-and-go driving conditions of the Manhattan (N.Y.)test cycle (74.6%), followed by the Orange County (Calif.) test cycle (50.6%), the Central Business District cycle (48.3%), and the King County (Wash.) Metro test cycle (30.3%). Emission trends were similar to fuel economy improvement trends. The hybrid shoed reductions in NOx emissions over the Manhattan cycle (38.7%), the Orange County cycle (28.6%), the Central Business District cycle (26.6%), and the King County test cycle (17.8%). Vehicle exhaust emissions, fuel consumption, and state of charge of the energy storage system were measured for repeated test conditions. The remainder of this document includes the experimental setup, test procedures, and results from vehicle testing performed at the NREL ReFUEL laboratory. |
Copyright Status | N - Not copyrighted, |
Document Owner | H |
