Patent ID: 7329201
Filing Date: 2008-02-12
Classification: B60K,B60W,F16H,Y02T

Abstract:
1. An electrically variable transmission comprising: an input member to receive power from an engine; an output member; first and second motor/generators; first, second and third differential gear sets each having first, second and third members; said input member being continuously connected or selectively connected with a member of said gear sets, and said output member being continuously connected with another member of said gear sets; a first interconnecting member continuously connecting said first member of said first gear set with said first member of said second gear set; a second interconnecting member continuously connecting said second member of said first gear set with said second member of said second gear set; a third interconnecting member continuously connecting said first member of said third gear set with said second or third member of said second gear set or with a stationary member; said first motor/generator being continuously or selectively connected with a member of said first or second gear set; said second motor/generator being continuously connected with a member of said second or third gear set which is different from said member connected with said first motor/generator; a first torque transfer device selectively connecting said input member or a member of said third gear set with a member of said first or second gear set; a second torque transfer device selectively connecting said input member or a member of said third gear set with a member of said first, second or third gear set, this member being different from the one connected to said first torque transfer device; a third torque transfer device selectively connecting a member of the first, second or third gear set with said stationary member or with said input member; a fourth torque transfer device connected in parallel with said first or second motor/generator for selectively braking rotation thereof; a fifth torque transfer device connected in parallel with the other of said first or second motor/generator for selectively braking rotation thereof; wherein said first, second, third, fourth and fifth torque transfer devices are selectively engageable singly or in combinations of two or three to provide an electrically variable transmission with a continuously variable range of speed ratios and four fixed forward speed ratios.