346
Alternative Fuels for Transportation
Driver
motor
Driven wheels
Fuel cell auxiliary power unit
Controller
Ventilation
fan
Fuel supply
Cooling
Air supply
system
system
system
Nontraction
electrical
loads
Transmission
M
DC/AC
Electric
traction
T, w
commands
Vehicle
controller
DC/DC
converter
DC/DC
converter
inverter
discharge unit
Battery charge/
Battery
Fuel
cell
Figure 11.4
Schematic of a fuel-cell based power system for a passenger car.
Approximately
60–100 kW capacity
Fuel cell
unit
DC/DC
converter
Battery
charge/discharge
unit
Traction
drive
Driver
commands
DC loads
DC/AC
inverter
AC loads
Main
DC bus
Driven wheels
Battery unit
(600–650 V DC)
Figure 11.5
Typical block diagram of a heavy-duty, fuel-cell powered transit bus.