A hydraulic hybrid system uses an accumulator (which stores energy as highly compressed gas) and one or more hydraulic pump/motors rather than the battery pack, electric generator/motor and power electronics used in electric hybrids.
A number of commercial hydraulic applications are under development.
The EPA and its partner, Eaton Corporation–Fluid Power, will build the world’s first full diesel-hydraulic series hybrid delivery truck for UPS. The hybrid system is based on numerous EPA pioneering hybrid patents. (Earlier post.)
Peterbilt and Eaton Corporation are jointly developing refuse trucks using Eaton’s parallel hydraulic hybrid system for Hydraulic Launch Assist (HLA). (Earlier post.)
Beijing will soon begin a large scale of test of hydraulic hybrid technology deployed on 50 buses, using technology developed by Chargeboard Electric Vehicle Co. (Earlier post.)
The mission of the Working Group is to create greater awareness of hydraulic hybrid technology, to advance its commercialization for use in automotive and commercial vehicle applications, and to develop technology-neutral standards and policies for hydraulic hybrid vehicles.
EPA testing has shown hydraulic hybrid drivetrains can produce over 80 miles per gallon for a midsize family sedan that also incorporates improved tires and aerodynamics.
NextEnergy’s partners in founding the Working Group include Dana Corporation, Eaton Corporation, Hybra-Drive Systems, Hydraulic Innovations LLC in a partnership with Altair Engineering, Southwest Research Institute, and the University of Michigan. The Working Group is also collaborating with the US EPA in its efforts.