Patent ID: 7494435
Filing Date: 2009-02-24
Classification: B60K,B60L,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 with at least one member of said gear sets, and said output member being continuously connected with a member of the third gear set, different from the at least one member connected to the input member; said first motor/generator being continuously connected with a member of said first or second gear set; said second motor/generator being continuously connected with a member of said first, second or third gear set or selectively connected with at least one member of said first or second gear set, which is different from said member continuously connected with said first motor/generator; 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 second gear set with said first member of said third gear set or with said second member of said first gear set but not both; a first torque transfer device selectively connecting a member of said first or second gear set with a member of said third gear set; a second torque transfer device selectively connecting a member of said first, second or third gear set with another member of said third gear set, the pair of members connected by said second torque transfer device being different from the pair of members connected by said first torque transfer device; a third torque transfer device selectively grounding a member of said first, second or third gear set; a fourth torque transfer device connected in parallel with one of said first and second motor/generators for selectively preventing rotation thereof or selectively connecting a member of said second gear set with a member of said third gear set; and a fifth torque transfer device connected in parallel with the other of said first and second motor/generators for selectively preventing rotation thereof; wherein said first, second, third, fourth and fifth torque transfer devices are engageable to provide an electrically variable transmission with a continuously variable range of speed ratios and four fixed forward speed ratios.