Control of power-on downshifts in a multiple-ratio...

Interrelated power delivery controls – including engine control – Plural engines – Electric engine

Reexamination Certificate

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C477S102000, C903S945000

Reexamination Certificate

active

10905324

ABSTRACT:
A method for controlling engagement and release of friction clutches in a multiple-ratio transmission for a hybrid electric vehicle powertrain uses electric motor torque to augment engine torque as a power-on downshift is commanded. Near the end of a downshift event, total powertrain torque is modulated or reduced to reduce torque disturbances.

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