Rexroth Hydraulic Hybrid Technology to be Tested in NYC Refuse Trucks


Rexroth, along with Crane Carrier Company and ISE Corporation, make up the supplier team for the HTUF project.

Bosch Rexroth's Hydrostatic Regenerative Brake (HRB) system will be tested in refuse trucks in the city of New York - potentially reducing fuel consumption and accompanying emissions by 30-50%.

(Rochester Hills, MI - www.boschrexroth-us.com) Bosch Rexroth has been selected by CALSTART's Hybrid Truck Users Forum (HTUF) Refuse Working Group to examine and test the use of hybrid vehicle technology in refuse trucks. Rexroth will contribute its Hydrostatic Regenerative Brake (HRB) parallel hydraulic hybrid system to the project, which will be deployed and tested in the city of New York.

Bosch Rexroth, Crane Carrier Company and ISE Corporation make up the supplier team for the HTUF project. During testing, the hybrid trucks are expected to demonstrate between 30 and 50 percent reductions in fuel and emissions use. The field tests are designed to authenticate both the technical and economical characteristics of the HRB system. It is anticipated the results will provide a solid foundation of HRB's potential, eventually leading to large scale deployment of in-service and new vehicles.

The HRB system will power the Crane Carrier LET2 chassis in the trucks, and will be integrated with the Heil refuse body hydraulic system for weight savings and efficient packaging. The HRB system uses a hydraulic pump/motor, connected to the driveline, to capture kinetic energy during vehicle braking. When braking, the pump/motor acts as a pump, absorbing energy from the driveline and imparting a retarding force on the drivewheels. It then uses the absorbed energy to pump hydraulic fluid into a nitrogen-pressurized accumulator. The accumulator is a tank containing inert gas that is compressed by the incoming fluid. During acceleration the pressurized gas pushes fluid out of the accumulator and the pump/motor then acts as a hydraulic motor, assisting the engine and reducing the fuel required to launch the vehicle. The overall process is referred to as regenerative braking.

Hydraulic hybrids are better equipped to cope with the extremely high power-handling requirements of regenerative braking, and they require fewer energy conversion steps that reduce efficiency. In this way, hybrid systems have the potential to capture a larger portion of the braking energy and make use of it more effectively.

Bosch Rexroth AG, part of the Bosch Group, achieved sales of approximately $7.4 billion (5.4 billion Euros) in 2007 with nearly 33,000 employees. Under the brand name of Rexroth the company offers all drive and control technologies, from mechanics, hydraulics and pneumatics to electronics and associated service. Over 500,000 customers worldwide utilize Rexroth's unique technological know-how to implement their innovative and future-oriented systems and machine concepts. The global player, represented in over 80 countries, is an extensive supplier of components and systems for industrial and factory automation and mobile applications. Visit www.boschrexroth-us.com for more information.

For more information, please contact

Bosch Rexroth Corporation
Michelle DuHadway
2730 Research Drive
Rochester Hills, MI 48309
Telephone (248) 265-5217
Fax (248) 844-2698
michelle.duhadway@boschrexroth-us.com

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