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Trucking News .     Detroit area to be test bed for new hydraulic hybrid diesel delivery truck. .

The U.S. Environmental Protection Agency (EPA) today unveiled the first-ever series hydraulic hybrid diesel urban delivery vehicle, which will provide dramatic improvements in fuel economy and in emission reductions. The development of the hydraulic hybrid is the result of a partnership between the EPA, U.S. Army, UPS, International Truck and Engine Corporation and Eaton Corporation, who have been working together on the hydraulic technology for several years.

UPS will test the hydraulic hybrid for the next several months. It will be used on a city route in the Detroit area, making daily deliveries to homes and businesses. The EPA and UPS plan to evaluate the vehicle's fuel economy performance and emissions. In laboratory testing, the EPA's patented hydraulic hybrid diesel technology achieved a 60 to 70 percent improvement in fuel economy and more than a 40 percent reduction in carbon dioxide emissions, compared to a conventional UPS vehicle.

In the series hydraulic hybrid diesel, a high-efficiency diesel engine is combined with a unique hydraulic propulsion system, replacing the conventional drivetrain and transmission. The vehicle uses hydraulic pumps and hydraulic storage tanks to store energy, similar to what is done with electric motors and batteries in hybrid electric vehicles. Fuel economy is increased in three ways: vehicle braking energy is recovered that normally is wasted; the engine is operated more efficiently; and the engine can be shut off when stopped or decelerating.

The diesel hydraulic hybrid truck is potentially eligible to qualify for a tax credit that is up to 40 percent of the incremental cost of the vehicle under a provision of the Energy Policy Act of 2005 for medium- and heavy-duty vehicles.