An electrically variable transmission family is provided which has
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, up to
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.