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Iowa Testing Hybrid School Buses

Lots of acceleration, double the gas mileage

January 17, 2008

So says Dan Taghon, the director of transportation for the Sigourney Community School District in southeast Iowa. He said his district's new hybrid bus has been running routes since Jan. 3. And Taghon, who drives the bus on one of the district's six routes, said he likes the 65-passenger machine powered by an electric motor and a V-8 diesel engine.

"It has quite a bit of get up and go," he said. "You push the pedal and it takes right off."

And that's why it takes some practice to get the most out of Iowa's first two hybrid buses, said Rich "Scottie" Scott, the director of transportation for the Nevada Community School District in central Iowa. The hybrid bus there also has been running routes since Jan. 3.

Both districts acquired the hybrid school buses with the help of Iowa State University's Center for Transportation Research and Education.

The buses' electric motors are very responsive to the accelerator, Scott said.

"Our driver is learning how to operate it," he said. "There's a big learning curve to get all of the efficiency out of it."

Researchers at Iowa State's Center for Transportation Research and Education worked with Advanced Energy, a nonprofit corporation based in Raleigh, N.C., for more than two years to bring the hybrid buses to Iowa. Dennis Kroeger, a transportation research specialist for the center, secured grants that paid for most of the $217,000 cost of each bus.

The buses feature electric drive trains that can move the buses at street speeds; their diesel engines take over at higher speeds. They also have technology that captures some of the energy of braking and uses that to help recharge their batteries.

Kroeger said researches will soon hook the buses to portable emissions monitors. They'll also download information from the engines' computers. They'll use the data to evaluate the buses' performance, fuel efficiency and emissions.

And the hybrids should do a lot better than standard buses. Kroeger said fuel efficiency could jump 40 to 50 percent, from six miles per gallon for a standard bus up to 10 or 11 miles per gallon for the hybrids.

Taghon said last week he still hadn't had to refuel his district's hybrid bus. After eight runs, he said the bus still had half to three-quarters of a tank of diesel.

That has Kroeger thinking hybrid technology has a future in school buses.

"This technology is new to school buses," Kroeger said. "But hybrid electric technology isn't brand new. So the development issues have been worked out. We expect these buses will definitely be able to stretch the fuel dollars."

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