Table 2 Propulsion System Components

Table 2Propulsion 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.