Multi-mode electrically variable transmissions with at least...

Details Multi-mode electrically variable transmissions with at least... Multi-mode electrically variable transmissions with at least...

2006-09-28

2008-12-09

Wright, Dirk (Department: 3681)

Planetary gear transmission systems or components

Input from independent power sources

Including electric motor input

Reexamination Certificate

active

07462122

ABSTRACT:
The electrically variable transmission family of the present invention provides low-content, low-cost electrically variable transmission mechanisms including three differential gear sets, a battery, two electric machines serving interchangeably as motors or generators and four or five selectable torque-transfer devices. The selectable torque transmitting devices are engaged to yield an EVT with a continuously variable range of speeds and five fixed speed ratios, four mechanically fixed forward speed ratios and one reverse 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.

REFERENCES:
patent: 5558595 (1996-09-01), Schmidt et al.
patent: 5931757 (1999-08-01), Schmidt
patent: 6478705 (2002-11-01), Holmes et al.
patent: 6527658 (2003-03-01), Holmes et al.
patent: 6962545 (2005-11-01), Larkin
patent: 7179185 (2007-02-01), Raghavan et al.
patent: 7306534 (2007-12-01), Bucknor et al.
patent: 2007/0275807 (2007-11-01), Bucknor et al.

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