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Method and apparatus for controlling battery charging in a hybrid electric vehicle

United States Patent

June 24, 2003
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A starter/alternator system (24) for hybrid electric vehicle (10) having an internal combustion engine (12) and an energy storage device (34) has a controller (30) coupled to the starter/alternator (26). The controller (30) has a state of charge manager (40) that monitors the state of charge of the energy storage device. The controller has eight battery state-of-charge threshold values that determine the hybrid operating mode of the hybrid electric vehicle. The value of the battery state-of-charge relative to the threshold values is a factor in the determination of the hybrid mode, for example; regenerative braking, charging, battery bleed, boost. The starter/alternator may be operated as a generator or a motor, depending upon the mode.
Phillips; Anthony Mark (Northville, MI), Blankenship; John Richard (Dearborn, MI), Bailey; Kathleen Ellen (Dearborn, MI), Jankovic; Miroslava (Birmingham, MI)
Ford Global Technologies, Inc. (Dearborn, MI)
09/ 705,501
November 3, 2000
GOVERNMENTAL RIGHTS This invention was made with government support under Prime Contract No. DE-AC36-83CH10093, Subcontract No. ZCB-4-13032-02, awarded by the Department of Energy. The Government has certain rights in this invention.