"Hybrid systems can have a major impact on reducing the more than 38 billion gallons of diesel fuel the U.S. trucking industry consumes every year," said Paul L. Vikner, president and CEO of Mack. "Mack's research indicates that hybrid electric systems in heavy-duty trucks could save as much as 35 percent of the fuel consumed by conventionally powered vehicles."
"Thanks to the support of the Air Force and Congress, we've already met many of the challenges involved in turning the hybrid concept into a reality in heavy-duty trucks," Vikner said.
The Mack hybrid electric powertrain features an integrated starter, alternator and motor referred to collectively as an electric machine. The electric machine assists the Granite vehicle's Mack MP7 diesel engine in providing torque to the wheels and regenerates energy during braking. This energy (stored in ultracapacitors) is then used in place of diesel fuel.
This technology provides the maximum fuel savings on routes with frequent braking and accelerations, particularly refuse collection and urban delivery, as well as certain construction applications.