Motor vehicles – Power – Electric
Patent
1997-11-03
1998-12-01
Swann, J. J.
Motor vehicles
Power
Electric
180 654, B60K 604
Patent
active
058425349
ABSTRACT:
A charge depletion method and apparatus for operating the electric motor and small auxiliary power unit, such as an internal combustion engine, in a hybrid electric vehicle (HEV) separately or together depending upon the driving conditions. Operation of the electric motor and auxiliary power unit are coordinated so that the vehicle operates as zero emissions vehicle (ZEV) or electric car at all speeds below a highway cruising threshold, unless the depth of discharge of the batteries exceeds a charge threshold in which case the vehicle operates in an HEV mode. Further, the vehicle operates in an HEV mode at speeds above the cruising threshold. The batteries are depleted during operation and are not charged by the auxiliary power unit, except during emergencies in which case the batteries are only charged enough to provide a performance enhancement to the small auxiliary power unit.
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Mar Michael
O'Banion John P.
Swann J. J.
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