LEHIGH VALLEY, PA - The United States Air Force displayed Mack Trucks, Inc.'s fuel-saving hybrid technology at the Hybrid Truck User Forum (HTUF) in Seattle. A Mack Granite model dump truck, built for the Air Force's Advanced Power Technology Office (APTO) and currently stationed at Nellis Air Force Base in Nevada, was at the HTUF exhibition and ride and drive.

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.

Specifications for Mack Granite Hybrid Diesel Electric Truck

Engine:
Type: Mack Model: MP7 - 365M, 11-liter turbocharged diesel 365 hp @ 1500-1900 RPM

Electric Machine
Type: Permanent Magnet; Synchronous Motor
Power: 161 hp peak; 94 hp continuous
Torque: 590 lb-ft. peak; 295 lb-ft continuous

Energy Storage
Type: Ultracapacitors
Usable Energy: 582 watts
Voltage: 300-725 volts DC

Transmission
Type: 12-speed automated manual

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.