Dual Mode Hybrid, Two Mode Hybrid Accomplishment

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Dual-Mode Hybrid/Two-Mode Hybrid Accomplishment

DOE-funded research, in collaboration
with Allison Buses and General Motors
Corporation has led to the
commercialization of a dramatically
different hybrid transmission system for
heavy-duty and light-duty applications.
The Dual-Mode or Two-Mode hybrid
system is an infinitely variable speed
hybrid transmission that works with the
engine and battery system and
automatically chooses to operate in a parallel or series hybrid path to maximize efficiency and
minimize emissions, fuel consumption and noise. Parallel and Series hybrid configurations are
found on most hybrid vehicles today, both with their own pluses and minuses. The Dual-
Mode/Two-Mode systems uses the positive characteristics from both systems to maximize fuel
economy in whichever vehicle they are placed.

The Dual-Mode/Two-Mode system in
buses are currently operating in Seattle,
Philadelphia, Washington DC, Houston,
Honolulu, Albuquerque, Aspen,
Vancouver, Minneapolis/St. Paul, Chicago,
Cleveland and Istanbul, Turkey. In-service
fuel economy improvements range from
20-54% compared to conventional buses
with Nitrous Oxide reductions up to 50%.

The Dual-Mode/Two-Mode system was
originally designed, in collaboration with
the U.S. Department of Energy and its
industry partners, to be employed in heavy
duty applications such as buses. After its
success in real-world applications, the
technology and technological know-how
associated with the system, were adapted
for light-duty applications. The Dual-
Mode/Two-Mode system is now found in
large SUV applications such as the
Chevrolet Tahoe, Chrysler Aspen, and
Dodge Durango. The Dual-Mode/Two-
Mode system is slated to be downsized and
will be featured in the new Saturn Vue 2-
Mode.

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The system is so popular BMW and other foreign auto manufacturers are looking to utilize the
technology in their SUV applications.

With over 85,000,000 miles in transit revenue service, the Dual-Mode/Two-Mode advanced
Nickel Metal Hydride energy storage system has yet to experience an end-of-life battery failure.

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