Table 2 Propulsion System Components
Table 2Propulsion System Components
| 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.