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Table 2 Propulsion System Components

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Bus Type Powerplant Drive System Fuel System
Diesel Compression ignition internal combustion engine (diesel) 5-speed automatic transmission Diesel fuel storage system
Diesel Hybrid Compression ignition internal combustion engine (diesel) Series hybrid drive system5
• traction generator
• electric traction motor
• energy storage system
• inverter/power electronics		 Diesel fuel storage system
CNG Spark ignition internal combustion engine (natural gas) 5-speed automatic transmission Compressed natural gas storage system (3,600 psi)
Fuel Cell Proton exchange membrane fuel cell engine Electric drive system
• electric traction motor
• inverter/power electronics		 Compressed hydrogen gas storage system (5,000 psi)
Fuel Cell Hybrid Proton exchange membrane fuel cell engine Series hybrid drive system
• electric traction motor
• energy storage system
• inverter/power electronics		 Compressed hydrogen gas storage system (5,000 psi)

5 Series hybrid technology was chosen to provide a more direct comparison to electric drive systems used in Fuel Cell and Fuel Cell Hybrid buses.  Parallel hybrid drive systems are also commercially available for transit buses.
Research and Innovative Technology Administration (RITA) • U.S. Department of Transportation (US DOT)
1200 New Jersey Avenue, SE • Washington, DC 20590 • 800-853-1351 • E-mail RITA

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