Battery-Powered Hybrids Could Become Old School

[Nbadan]

EPA Invents Battery-Less Hybrid System

Called hydraulic hybrid technology, the system uses energy stored up during braking to help propel a vehicle during acceleration. The energy is stored in pressurized hydraulic fluid, the same sort of fluid used in brake lines and for power steering.

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In the EPA's hydraulic hybrid system, braking pressure is used to power pumps that compress hydraulic fluid. This stores energy in the same way you would if you squeezed a spring with your hands. When needed, the pressure is released and the expanding hydraulic fluid is used to power gears that help turn the vehicle's wheels. The EPA began working on the system about 10 years ago, said Oge, under a Clinton administration program to research clean energy technology.

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There is a major advantage to the EPA's new system and one major disadvantage, the agency said. The advantage is its simplicity and relatively low cost. The system would cost an estimated $600 to install on a mass-production basis, the agency estimates, compared to $3,000 to $6,000 for an electric hybrid system. The disadvantage is the system's weight, the EPA says. According to a 2004 EPA report, a hydraulic hybrid SUV would weigh about 190 pounds more than a conventional SUV. That means the EPA's system is most applicable to trucks where the added weight would make a smaller overall difference, the agency said.

The added weight of the system is similar to the weight of an electric hybrid system, although the EPA itself cites weight as a disadvantage.

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