| 摘要 |
<p>PURPOSE: A power transmission system of a hybrid vehicle is provided to enable a multi-mode operation and a high-efficiency operation for the whole gear ratio range of the vehicle and to improve fuel efficiency. CONSTITUTION: A power transmission system of a hybrid vehicle comprises first and second planetary gear sets(PG1,PG2), first and second motor/generators(MG1,MG2), and a torque transmission mechanism. The first and second planetary gear sets is directly connected with one rotary element and selectively connected with another rotary element, thereby operating as a single composite planetary gear set. The first and second motor/generators are independent power sources that serve as a motor or generator. The torque transmission mechanism comprises a first clutch(CL1) which selectively connects one rotary element of the first planetary gear set and one rotary element of the second planetary gear set, a second clutch(CL2) which selectively connects two of three rotary elements of the first planetary gear set, a first brake(BK1) which variably connects one rotary element of the first planetary gear set and a transmission housing(H) to one rotary element of the second planetary gear set so that the rotary element of the second planetary gear set can operate as a fixing element, and a second brake(BK2) which is arranged in parallel with the second motor/generator so that a rotary element connected to the second motor/generator can operate as a selective fixing element.</p> |
