Two-planetary electrically variable transmissions with multiple fixed ratios
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.
GM Global Technology Operations, Inc.
B F F F F B F F F F B F F F B Y B
B60K F16H F16H F16H F16H B60K F16H F16H F16H F16H B60K F16H F16H F16H B60K Y02T B60K
inventional additional inventional additional additional additional additional additional additional additional inventional additional additional additional inventional additional inventional
Norman K. Madhusudan Joshua E. Alan G. James D. John A. Tejinder
Bucknor Raghavan Lehrmann Holmes Hendrickson Diemer Singh