Prime-mover dynamo plants – Electric control – Engine control
Patent
1997-02-27
1998-10-13
Stephan, Steven L.
Prime-mover dynamo plants
Electric control
Engine control
290 16, 290 27, 318143, 180 654, 322 16, H02P 904
Patent
active
058201726
ABSTRACT:
An operating strategy for a hybrid electric vehicle (HEV) manages the flow of energy to both supply the motive demand power of the HEV and maintain the charge of the energy storage system (ESS). A controller operates the main power unit (HPU) and ESS and, using an optimal fuel cost strategy, scans all possible combinations of power from the HPU and ESS that satisfy the motive demand power. The combination with the lowest fuel cost is selected and the ESS is charged, when possible, using marginal charging; but, if the state of charge of the ESS falls below a certain level, fast charging is invoked. A minimum power threshold strategy can be used rather than the fuel cost strategy. The minimum power threshold strategy determines the optimal compromise of HPU operation and ESS operation to maximize fuel economy by using a motive power threshold below which the HPU is not operated except to recharge the ESS.
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Brigham David Richens
Giardini Sandra
Lev Amos
Romlein Timothy
Tamor Michael Alan
Ford Global Technologies Inc.
May Roger L.
Ponomarenko Nicholas
Sparschu Mark S.
Stephan Steven L.
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