Modeling Control Strategies and Range Impacts for Electric Vehicle Integrated Thermal Management Systems with MATLAB/Simulink

Jason Lustbader, Eugene Titov

Research output: Contribution to conferencePaperpeer-review

9 Scopus Citations

Abstract

The National Renewable Energy Laboratory's (NREL's) CoolSim MATLAB/Simulink modeling framework was used to explore control strategies for an electric vehicle combined loop system. Three system variants of increased complexity and efficiency were explored: a glycol-based positive temperature coefficient heater (PTC), PTC with power electronics and electric motor (PEEM) waste heat recovery, and PTC with PEEM waste heat recovery plus heat pump versions. Additionally, the benefit of electric motor preheating was considered. A two-level control strategy was developed where the mode selection and component control were treated separately. Only the parameters typically available by vehicle sensors were used to control the system. The control approach included a mode selection algorithm and controllers for the compressor speed, cabin blower flow rate, coolant flow rate, and the front-end heat exchanger coolant bypass rate. The electric motor was bypassed by the cooling circuit until its temperature exceeded the coolant inlet temperature. The impact of these thermal systems on electric vehicle range during warmup was simulated for the Urban Dynamometer Driving Schedule (UDDS) and Highway Fuel Economy Test (HWFET2X) drive cycles weighted 45%/55% respectively. A range of ambient temperatures from -20°C to +20°C was considered. NREL's Future Automotive Systems Technology Simulator (FASTSim) vehicle modeling tool showed up to a 10.9% improvement in range for the full system over the baseline during warmup from cold soak. The full system with preheat showed up to 17% improvement in range.

Original languageAmerican English
Number of pages11
DOIs
StatePublished - 28 Mar 2017
EventSAE World Congress Experience, WCX 2017 - Detroit, United States
Duration: 4 Apr 20176 Apr 2017

Conference

ConferenceSAE World Congress Experience, WCX 2017
Country/TerritoryUnited States
CityDetroit
Period4/04/176/04/17

Bibliographical note

Publisher Copyright:
Copyright © 2017 SAE International.

NREL Publication Number

  • NREL/CP-5400-67672

Other Report Number

  • SAE Technical Paper No. 2017-01-0191

Keywords

  • control strategies
  • electric vehicle
  • range impacts
  • thermal management

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