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 five or six selectable torque-transfer devices. The
selectable torque transfer devices are engaged to provide an EVT with a
continuously variable range of speeds (including reverse), four or more
mechanically fixed forward speed ratios and at least one mechanical
reverse speed ratio. The torque transfer devices and the first and second
motor/generators are operable to provide six operating modes in the
electrically variable transmission, including battery reverse mode, EVT
reverse mode, reverse and forward launch modes, continuously variable
transmission range mode, fixed forward mode and mechanical reverse mode.