|Post-transmission parallel hybrid drive. Click to enlarge.|
Enova Systems has integrated and delivered a post-transmission 120 kW parallel-hybrid truck to a major unnamed North American truck manufacturer as an initial milestone in a joint-development program announced earlier this year. (Earlier post.)
As delivered, the hybrid drive system provided an average reduction in fuel consumption of more than 31%, and an increase in mileage in excess of 48%. Given the demonstrated performance, Enova believes that the vehicle could be in production in the second half of 2006.
The confirmed fuel consumption and mileage improvements provide the necessary benefits to make a very good business case.—Mike Staran, Enova Vice President of Marketing
Enova is taking a dual-path approach in offering both series- and parallel-hybrid drive systems. The company has developed a variety of heavy-duty hybrid drives, including a series-hybrid system with a diesel genset; two variations of a pre-transmission parallel hybrid drive system; and the post-transmission parallel-hybrid system used in the project above.
Mack Truck is using a post-transmission parallel hybrid in a refueler hybrid prototype (earlier post).
The 120-kW hybrid drive is designed for light trucks, delivery vans, and mid-sized buses using electric and series hybrid-electric propulsion. This system can provide 1,664 Nm of drive shaft torque when used with the Enova gear-reduction unit and operates on a DC input voltage that can range from 250–425VDC.