Interrelated power delivery controls – including engine control – Plural engines
Reexamination Certificate
2011-07-05
2011-07-05
Ho, Ha D. (Department: 3655)
Interrelated power delivery controls, including engine control
Plural engines
C477S015000, C477S020000
Reexamination Certificate
active
07972239
ABSTRACT:
A dual pump strategy for a hybrid electric automatic transmission necessitating one internal mechanically driven pump linked to the engine output shaft and an external fixed displacement pump powered by a brushless permanent magnet motor consisting of a controller with closed loop feedback control for operating such is disclosed. In neutral and electric drive mode, with the engine off, the flow demand for the transmission is sustained largely by the external pump.
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Caterpillar Inc.
Ho Ha D.
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