SCHOOL BUS EXHAUST
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using an Enova Systems drive solution and a charge-sustaining hybrid model utilizing an Eaton system. Tomas Built Buses offers a charge-sustaining hybrid-electric option in partnership with Eaton, and Collins Bus offers the hybrid option for its Type-A Nex- Bus on a Ford chassis. Te biggest push in the electric school bus sector comes from Trans Tech Bus. It is launching its all-electric Type A eTrans, an integrated vehicle running on a 120kw induction motor allowing it to reach speeds of up to 60 mph. Te eTrans has a trip range of approxi-
mately 120 to 130 miles per charge from its two lithium-ion batteries, and its recharging system allows the school bus to regenerate almost anywhere taking approximately 6 to 8 hours to fully charge. Currently, there are no eTrans (current or
prior model year) on the road, but two are in development, according to Brian Barrington, national sales manager at Trans Tech. “As of right now we do not have any
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eTrans on the road due to a chassis supply issue. At this time we are exploring two electric chassis options,” said Barrington. While hybrids and electrics boast their
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54 School Transportation News July 2013
own fuel-saving advantages, obstacles that remain include the price of replacement electric batteries, which remain virtu- al unknown, and driver behavior. Steve Simmons, director of transportation at Columbus (Ohio) City Schools, said fuel economy relies heavily on bus drivers’ feet, which tend to be heavy. Te district has operated six hybrids for the past several years. But Simmons said
Collins Bus’ propane NexBus was the first of its kind for the Type-A market, and the company expects to release the first CNG Type-A option later this year.
Thomas Built's hybrid-diesel, Type-D school bus.
his drivers have had to be trained to not drive them like their diesel predecessors. For example, the accelerators on hybrids don’t need to be depressed like they are on diesels. Hard starts can cause a negative effect on fuel mileage, so he recommended would-be purchasers to keep that in mind. Still, many in the industry feel that
electric vehicles are a natural fit for a school bus, because of the fixed routes and decreased maintenance. However, within research and development circles there’s “range anxiety” for the emerging electric and hybrid versions. Paul Rasmussen, professor and alternative
fuel researcher from University of Michigan, says there’s a growing focus on the concept of regenerative breaking for commercial vehicles. “Tat’s big, especially for school buses
which stop and go in residential and urban areas. We’re watching start-and-stop regen- erating trends in China and Europe,” said Rasmussen.
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