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, six selectable torque-transfer 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 four mechanically fixed forward speed ratios. 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.