Patent ID: 7356398
Filing Date: 2008-04-08
Classification: B60K,B60W,F16H,Y02T,Y10T

Abstract:
1. A method for controlling a synchronous mode to mode shift in a multi-mode, electro-mechanical transmission including an input member and an output member, first and second torque transfer devices, at least one motor adapted for imparting torque to the transmission, first mode operation characterized by simultaneous first torque transfer device applied and second torque transfer device released states wherein the transmission input member is mechanically coupled to the transmission output member through a continuously variable ratio, second mode operation characterized by simultaneous first torque transfer device released and second torque transfer device applied states wherein the transmission input member is mechanically coupled to the transmission output member through a continuously variable ratio, and fixed-ratio operation characterized by simultaneous first and second torque transfer devices applied states wherein the transmission input member is mechanically coupled to the transmission output member through a fixed ratio, comprising: applying the one of the first and second torque transfer devices which is initially in a released state while controlling slip speed thereacross to substantially zero by adjusting motor torque to establish synchronous operation wherein slip speed across the first and second torque transfer devices is substantially zero and thereafter releasing the other one of the first and second torque transfer devices which is initially in an applied state while controlling slip speed thereacross to substantially zero by adjusting motor torque.