Compound Lever Based Optimal Configuration Selection of Compound-Split Hybrid Vehicles

Paper #:
  • 2017-01-1148

Published:
  • 2017-03-28
Abstract:
Finding optimal split hybrid configurations through exhaustive search is almost intractable, mainly due to the huge design space, e.g. 252 compound split configurations using two planetary gear sets (PG). Thus, a systematic comprehensive design methodology is required. Most of the prior studies in this matter proposed methodologies that assess the performance within the physical design space, i.e. based on the powertrain configurations. However, this paper proposes a compound lever-based comprehensive design methodology, which aims to find optimal compound split configurations in terms of both fuel economy and acceleration performance starting from the compound (virtual) lever design space rather than the physical design space, i.e. powertrain configurations. In fact, the compound (virtual) lever is an attractive tool to find optimal compound split configurations as it is comprised of two design variables, α and β, which dramatically reduces the computational load as redundant configurations are omitted through assessing the performance metrics of the entire compound split configurations design space using the compound lever. Optimal compound levers, i.e. optimal α and β, are selected based on the two dimensional performance maps, i.e. ‘fuel economy-acceleration’ plane. Nevertheless, unless the selected optimal compound levers are converted into powertrain configurations, all the efforts and analyses to find optimal configurations are impractical, as the selected configurations do not provide any insight about the physical design, e.g. PGs connections and gear ratios, and therefore, cannot be used for real-world implementation. Thus, conversion equations were developed and used to convert any given compound lever into feasible powertrain configurations. Using this compound-lever based design methodology resulted in finding various compound split configurations with outstanding fuel economy and acceleration performance better than the commercialized ones.
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