The electrically variable transmission family of the present invention
provides low-content, low-cost electrically variable transmission
mechanisms including first, second and third differential gear sets, a
battery, two electric machines serving interchangeably as motors or
generators, and up to five selectable torque-transfer devices, and
possibly a dog clutch. The selectable torque transfer devices are engaged
singly or combinations of two to yield an EVT with a continuously
variable range of speeds (including reverse) and up to four mechanically
fixed forward speed ratios. The torque transfer 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.