First Fuel Cell Powered Bus
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Fuel Cell Hybrid Electric Transit
How The Fuel Cell
Hybrid System Works
This is a completely electric vehicle, meaning
no combustion takes place and no harmful emissions are generated.
This is a battery-heavy hybrid in that the batteries are used
as the primary source of electric power for the drive motor, while the
fuel cell stack is used to slowly recharge the batteries.
Therefore, the fuel cell acts a range extender.
When the bus is turned on, electricity flows from the batteries to the
traction motor, powering the final drive which turns the rear wheels.
During operation, if the battery state-of-charge drops below 60%, the
fuel cell turns on and provides electricity to the system, to help
power the bus and/or recharge the batteries. The bus is equipped with
regenerative braking so that when the brakes are applied, the kinetic
energy of the bus is converted back to electricity by the traction
motor and stored in the batteries.
bus emits zero
greenhouse gases, is significantly quieter than a typical
diesel transit bus, and gets better
gas mileage (15 mpgge for the fuel cell bus, compared to
approximately 5.5 mpg for a typical diesel transit bus). Also, by using
a smaller fuel cell stack than similar sized fleet fuel cell buses, the
overall cost is greatly reduced. This makes the bus more affordable for
transit agencies wishing to incorporate new fuel cell technology into
This Bus Different?
Left to right: Dr. Arde
Faghri, Dr. Suresh G. Advani, and Dr. Ajay K. Prasad
Left to right: Darren Brown and Doug Brunner
Doug Brunner refueling the bus.