However, multiple planetary gear trains provide the transmission with multiple working modes. Then, people tend to add more planetary gear trains in PSTs. , indicating that the planetary ratio can affect operating points of the variators and efficiency.
A sensitivity analysis study has been conducted by Zaremba et al. To optimize PST configurations, several studies focused on the optimization of the planetary ratio k. PST can also be applied in the wind turbine to capture maximum energy from wind. For off-highway vehicles, such as tractors, construction machinery, and tanks, PST is a competitive solution due to its high-torque capacity, the ability of power shifting, and continuous steering. As the world’s environmental problem emerges, PST has attracted significant attention from researchers and manufacturers due to its lower fuel consumption and operation cost in hybrid vehicles and urban buses. Thus, PST can be applied to severe working conditions that require high efficiency, continuously variable speed ratio, and automatic shifting. It enjoys complementary advantages of different transmission technologies through optimization design and reasonable control strategy. Power-split transmission (PST) combines different transmission technologies. The results show that the proposed torque distribution diagram-based computational method is feasible, and the planetary traction drive can be a competitive power-split device for power-split transmission. Based on a contact model and a proposed torque distribution diagram method, this study proposes a fast computational method for calculating the performance of the new continuously variable power-split transmission. This study is the first step to precisely calculate the emerging power-split transmission with the planetary traction drive.
Then, we derive the torque and speed distribution formulas that consider the influence of spin torque and creep motion. In this study, we investigate the relationships between torques and speeds. However, the participation of the planetary traction drive brings about creep and spin motion, which increase the difficulty of precise calculation. Another solution is replacing the planetary gear train with a planetary traction drive. To obtain various planetary ratios in one transmission system, people use complex systems with multiple planetary gear trains, clutches, and brakes. The key parameter of power-split transmission is the planetary ratio.
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