An OSU Cascades research team is finding a cheaper way for natural gas vehicle fueling at home
While natural gas fuel stations are opening across the United States, the concern of consistently finding fuel is still a stumbling block for the average consumer wanting to buy a natural gas vehicle (NGV). One solution is home fueling, and a team led by Dr. Chris Hagen, Assistant Professor, Energy Systems Engineering at Oregon State University (OSU) Cascades, thinks it has the answer.
OSU secured U.S. Department of Energy (DOE) funding in 2012 to modify a passenger vehicle so its internal combustion could be used to compress natural gas for storage on the vehicle. The goal is to reduce the cost and time for home-refueling, and to improve the convenience and cost for the average consumer owning a natural gas vehicle.
With over $900,000 of DOE ARPA-E funding, Dr. Hagen is the principal investigator, with support from Colorado State University and engineering firm CZero, Inc. He’s also co-founded a company to develop the technology commercially.
Dr. Hagen said the team wanted to leverage the sophistication of the modern internal combustion engine when brainstorming for a natural gas solution. Using the engine to act as the compressor, they don’t have repeating parts in a compressor on the garage wall, reducing the overall cost of self-fueling.
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L to R, Dr. Chris Hagen, Zachary Taie, Robert Elgin III, Josh Tibbitts in the OSU Energy Systems Laboratory next to their bi-modal compression/combustion engine
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The design concept involves adapting one of the cylinders to compress gas when parked overnight. This could enable wider adoption of natural gas because vehicle owners have the freedom to fill up at home or elsewhere. Owners could fuel at a fueling station, at home, or even another’s home when traveling – provided the friends have a natural gas utility connection enabled for it. “One of the beauties of this technology,” says Hagen, “is that the compressor rides with you.”
The development engine was modified to allow for two separate “modes” of operation. In commute mode used for driving, the engine runs as normal, firing on all cylinders. In refueling mode, the one or two modified engine cylinders compress gas while the other cylinders operate normally to power the compression and cool the system.