Patent ID: 7416501
Filing Date: 2008-08-26
Classification: B60K,F16H,Y02T,Y10S

Abstract:
1. An electrically variable transmission comprising: an input member for receiving power from an engine; an output member for delivering power from the transmission; first and second motor/generators each operatively connected between said input member and said output member and controllable to provide or receive power flowing therebetween; a first differential gear set operatively connected between said input member and said output member and having a first, a second and a third member; wherein one of said members of said first differential gear set is continuously connected with one of said input member and said output member and another of said members of said first differential gear set is continuously connected with one of said motor/generators; a lockup clutch selectively engagable to connect any two of said members of said first differential gear set together for common rotation, engagement of said lockup clutch thereby providing a fixed mechanical ratio between said input member and said output member without requiring power from either of said motor/generators; and wherein said motor/generators and said first differential gear set establish a single range power flow arrangement when said lockup clutch is not engaged; wherein said transmission is an input-split type; wherein said first differential gear set is a planetary gear set and said members of said first differential gear set are a ring gear member, a carrier member and a sun gear member; wherein said input member is continuously connected with said carrier member; wherein said first motor/generator is continuously connected with said sun gear member; and wherein said ring gear member is continuously connected with said second motor/generator and said output member.