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CSME 2021/04
Volume 42 No.2
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131-140
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On the Innovative Design for Hybrid CVTs with Mechanical Reverse Driving Mode
Chun-Yao Yeha and Hong-Sen Yana
aDepartment of Mechanical Engineering, National Pintung University of Science and Technology, Pingtung, Taiwan 91207, ROC.
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Abstract:
This paper aims to develop a systematical design procedure to synthesize all feasible hybrid transmissions, mainly on series-parallel hybrid continuous variable transmissions (CVTs) with a mechanical reverse driving mode. Following the proposed design procedure and subject to the design constraints, 21 novel hybrid CVTs are synthesized. One is shown that the transmission system makes possible a maximum vehicle speed of 226 km/h, a 0 ~100 km/h acceleration time of 7.1439 seconds, and a gradeability of 51.16 %. A simulation model is developed to investigate the fuel efficiency performance of the proposed design. In addition, a control strategy is constructed to dynamically adjust the operation mode of the hybrid transmission in accordance with changes in the road conditions. It is shown that the simulated vehicle with the proposed hybrid CVT achieves a fuel consumption of 45 mpg under urban driving cycles and 36 mpg under highway driving conditions. As such, the HEV performance is highly competitive with that of existing HEVs on the commercial market.
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Keywords: systematical design procedure, CVTs, mechanical reverse driving mode, hybrid transmission.
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©
2021
CSME , ISSN 0257-9731
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