Article history:Because of the increases in international oil prices and the level of global warming, the automotive industry has much interest in developing green cars with high fuel efficiencies. In addition, researchers in Korea are actively responding to high oil prices and CO 2 emission regulations in many ways. One example is, the multi-mode hybrid system, which is being studied to improve its performance. Because a multi-mode hybrid system is able to overcome the weaknesses of a system that uses simple planetary gears, excellent fuel efficiency and driving performances are the key features of the system. This paper analyzes the driving performance of the power-train system of GM-2MT70, which consists of one engine, two electric motors, one simple planetary gear, one double planetary gear, two clutches, and two brakes. The driving performance of the system's steady state is analyzed using performance modeling. The dynamic performance is analyzed using Matlab Simulink. . 특히 차량의 연비개선 필요성이 대두되면서 하이브리드 자동 차의 효율을 높이기 위하여 멀티모드 하이브리드에 관한 연구가 진행되고 있다 [5] . 일반적으로 유성기어식 하이브리드 시스템은 크 게 입력분기, 출력분기, 복합분기 방식으로 나눌 수 있다. 멀티 모 드 하이브리드 시스템은 2개 이상의 분기모드와 고정기어 모드를 사용하는 시스템으로서, 클러치의 결합 및 해제를 통해 각 상황에

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