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.