Control analysis and model validation for BMW i3 Range Extender

Paper #:
  • 2017-01-1152

Published:
  • 2017-03-28
Abstract:
For many years, we have tested, analyzed and validated the models for convention, hybrid electric, plug-in hybrid electric and battery electric vehicles including thermal aspects. In this study, the control analysis and model validation of BMW i3-Range Extender (REX) was conducted based on the test data. The vehicle test was performed on a chassis dynamometer set in a thermal chamber at Advanced Powertrain Research Facility in Argonne National Lab. BMW i3-REX is a series type plug-in hybrid range extended vehicle which consists of 0.65L in-line 2-cylinders range extending engine with 26.6kW generator, 125kW permanent magnet synchronous AC motor and 18.8 kWh lithium-Ion battery. First, the components and vehicle models were developed based on the test data including thermal aspects. For example, engine fuel consumption rate, battery resistance or cabin HVAC energy consumption are affected by the temperature. Second, the vehicle-level control strategy was analyzed especially in normal temperature condition (22°C ambient temperature). The analysis is focused on the engine on/off, battery SOC balancing and operating conditions of engine in both charge-depleting and charge-sustaining modes. Next, the difference of control strategy according to the environmental conditions (–7°C or 35°C ambient temperatures) or vehicle state (soaked or warmed-up vehicle) was also analyzed. Finally, the validation of the developed model based on Autonomie, a high-fidelity, forward-looking vehicle simulation tool, is presented. The engine fuel consumption and battery SOC results are within test-to-test variability in the most thermal conditions.
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