The 200 new hybrid electric vehicles (HEVs) join roughly 20,000 low-emission and alternative-fuel vehicles already in use and have been deployed in Austin, Houston, Philadelphia, Chicago, Washington, D.C., Long Island, Minneapolis and Louisville. Before this latest deployment, UPS was operating 50 hybrid electrics in Atlanta, Dallas, Houston and Phoenix.
The HEV fleet features two different size vehicles from Workhorse Custom Chassis and Freightliner Custom Chassis Corporation and a hybrid power system from Eaton Corporation. The hybrid system uses a parallel, pre-transmission design. Primary components are the Hybrid Drive Unit (HDU), which combines a clutch, a 44 kW/420 N·m motor/generator and automatically controlled manual transmission; the motor inverter/controller; the DC/DC converter; and a 2 kWh li-ion battery pack. (Earlier post.)
The 200 new HEV delivery trucks are expected to reduce fuel consumption by roughly 176,000 gallons over the course of a year compared to an equivalent number of traditional diesel trucks. The hybrids also should reduce by 1,786 metric tons the amount of CO2 gases released annually into the atmosphere.