Integrated energy and thermal management for electrified powertrains

Caiyang Wei (Corresponding author), Theo Hofman, Esin Ilhan Caarls, Rokus van Iperen

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)
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Abstract

This study presents an integrated energy and thermal management system to identify the fuel-saving potential caused by cold-starting an electrified powertrain. In addition, it quantifies the benefit of adopting waste heat recovery (WHR) technologies on the ultimate fuel savings. A cold-start implies a low engine temperature, which increases the frictional power dissipation in the engine, leading to excess fuel usage. A dual-source WHR (DSWHR) system is employed to recuperate waste heat from exhaust gases. The energy harvested is stored in a battery and can be retrieved when needed. Moreover, the system recovers waste heat from an electric machine, including power electronics and a continuous variable transmission, to boost the heating performance of a heat pump for cabin heating. This results in a decrease in the load on the battery. The integrated energy and thermal management system aims at maximizing the fuel efficiency for a pre-defined drive cycle. Simulation results show that cold-start conditions affect the fuel-saving potential significantly, up to 7.1% on the New European Driving Cycle (NEDC), yet have a small impact on the optimal controller. The DSWHR system improves the fuel economy remarkably, up to 13.1% on the NEDC, from which the design of WHR technologies and dimensioning of powertrain components can be derived. As the optimal solution is obtained offline, a complete energy consumption minimization strategy framework, considering both energy and thermal aspects, is proposed to enable online implementation.

Original languageEnglish
Article number2058
Number of pages24
JournalEnergies
Volume12
Issue number11
DOIs
Publication statusPublished - 1 Jun 2019

Keywords

  • Cold-start
  • Electrified powertrains
  • Energy management
  • Heat pump
  • Optimal control
  • Rankine cycle
  • Thermal management
  • Waste heat recovery
  • electrified powertrains
  • waste heat recovery
  • optimal control
  • cold-start
  • heat pump
  • energy management
  • thermal management

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