Electrically variable transmissions having two planetary...

Details Electrically variable transmissions having two planetary... Electrically variable transmissions having two planetary...

2006-03-17

2008-09-09

Pang, Roger (Department: 3681)

Planetary gear transmission systems or components

Input from independent power sources

Including electric motor input

C475S282000, C475S280000

Reexamination Certificate

active

07422535

ABSTRACT:
The electrically variable transmission family of the present invention provides low-content, low-cost electrically variable transmission mechanisms including first and second differential gear sets, a battery, two electric machines serving interchangeably as motors or generators, four or five selectable torque-transmitting devices, and possibly a dog clutch. The selectable torque transmitting devices are engaged to yield an EVT with a continuously variable range of speeds (including reverse) and at least one mechanically fixed forward speed ratio. The torque transmitting devices and the first and second motor/generators are operable to provide five operating modes in the electrically variable transmission, including battery reverse mode, EVT reverse mode, reverse and forward launch modes, continuously variable transmission range mode, and fixed ratio mode.

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patent: 7264071 (2007-09-01), Schmidt et al.
patent: 7273435 (2007-09-01), Raghavan et al.
patent: 7288041 (2007-10-01), Bucknor et al.

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