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CSME 2022/12
Volume 43 No.6
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539-547
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On the Design of Hybrid Systems with Continuously Variable Units utilizing a Basic Path Graph
Hsien-Yu Kuoa and Tyng Liua
aDepartment of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 10617, ROC
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Abstract:
In this paper, a graphical method called the basic path graph (BPG) is utilized to synthesize the structure of hybrid systems with continuously variable units (CVUs). The symbols for the mechanical units and the classification of systems according to their characteristics are specified. Among them, two features are related to a wider ratio coverage and higher torque capacity. The systems can be synthesized with the Y-pattern, single-Δ-pattern, and double-Δ-pattern in a BPG. The total numbers of possible combinations are calculated. To ensure the viability of the system, the required mechanical units and their positions are specified. A detailed design example is provided. The result of the analysis shows that the overall ratio coverage for the synthesized system is 2.7 times wider than its CVU. The CVU only transfers 74% to 92% of the input torque and power. Therefore, it can also help to increase the torque capacity of the system.
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Keywords: continuously variable transmission (CVT), hybrid system, powertrain design
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©
2022
CSME , ISSN 0257-9731
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