Technical Paper
Emissions from Conventional and Hybrid Electric Transit Buses Tested on Standard and San Francisco Specific Driving Cycles
2002-11-18
2002-01-3117
California Air Resources Board's transit bus fleet regulation required public transit fleets in California to reduce emissions starting in 2002 [1]. In response to this rule, San Francisco Municipal Railway (Muni) launched the “Alternative Fuel Pilot Project”. The objective of the project is to compare the on-road performance, emissions, maintainability, safety, and costs of advanced diesel and alternative fuel buses over a two-year period. This paper discusses the preliminary emissions results from chassis dynamometer testing conducted during the first six months of the emissions study. The California Truck Testing Service's dynamometer facility tested four types of buses: conventional diesel, conventional diesel with particulate traps, compressed natural gas, and hybrid-electric transit buses.