Power Losses Minimization for Optimal Operating Maps in Power-Split HEVs: A Case Study on the Chevrolet Volt

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The power-split architecture is the most promising hybrid electric powertrain. However, areal advantage in energy saving while maintaining high performance can be achieved only by theimplementation of a proper energy management strategy. This requires an optimized functionaldesign before and a comprehensive analysis of the powertrain losses after, which could be ratherchallenging owing to the constructive complexity of the power-split transmission, especially for multimodearchitecture with multiple planetary gearing. This difficulty was overcome by a dimensionlessmodel, already available in the literature, that enables the analysis of any power-split transmission,even in full electric operation. This paper relies on this approach to find the operating points of theinternal combustion engine and both electric machines which minimize the total power losses. Thisoptimization is carried out for given vehicle speed and demanded torque, by supposing differentscenarios in respect of the battery capability of providing or gathering power. The efficiency of thethermal engine and the electric machines is considered, as well as the transmission mechanical powerlosses. The aim is to provide a global efficiency map that can be exploited to extract data for theimplementation of the most suitable real-time control strategy. As a case study, the procedure isapplied to the multi-mode power-split system of the Chevrolet Volt.
Original languageEnglish
Number of pages18
Publication statusPublished - 2021

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Instrumentation
  • General Engineering
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

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