Sensitivity Study on Air Conditioning System Performance and Vehicle Fuel Economy Trade-Offs

Paper #:
  • 2017-01-0171

Published:
  • 2017-03-28
Abstract:
In this paper, the tradeoff relationship between the air conditioning system performance and vehicle fuel economy for electrified vehicles during SC03 drive cycle is presented. First, an air conditioning system model was integrated into the Vehicle Model Architecture (VMA) and Simulink-CVSP (S-CVSP) according to the locations of subsystems and control features. Then, an open-loop sensitivity study is performed on the stand-alone ACDC simulator without controller incorporated at a fixed time step as well as over a drive cycle by formulating a static optimization problem minimizing the total actuator energy use and maintains identical cooling capacity as the benchmark. Afterwards, a closed-loop sensitivity study conducted on a ModeFrontier project with respect to three types of formulations of cooling capacity constraints. Finally, the common observation from both studies, that the compressor rotation speed dominates the cooling capacity and the EDF fan influences marginally, is explained using thermodynamic knowledge on vapor compression cycle.
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