Evaluation of Thermal Environment in Vehicles for Occupant Comfort using Equivalent Temperature of Thermal Manikin

Paper #:
  • 2018-01-0059

  • 2018-04-03
Masahiro Morishita & Toshiya Uchida, CalsonicKansei Japan Gursaran D. Mathur*, CalsonicKansei North America Kazuhiko Matsunaga, Isuzu Motors Inc, Japan In recent years, a number of OEMs have started using idle start stop function to save energy and to reduce pollution. For vehicles with internal combustion engines the engine stops at a red light or a stop sign when the vehicles comes to a rest. At this time the compressor of the AC loop also stops. Blower fan remains operating at idle condition and the air temperature at the vent outlets increases. This cause discomfort to the occupants sitting within the vehicle cabin. In these this situation, engine needs to start idling to run AC system to provide comfort to occupants by spending fuel. For idle start stop technology, it is necessary to design a highly efficient system. To develop a highly efficient idle start stop system, idling time needs to be minimized. To achieve this, it is necessary to predict occupant's comfort correctly and precisely. However, the thermal environment within the cabin is unsteady and highly non-uniform. The existing standard of ISO-14505-2 does not consider this cabin condition. Hence, the authors have developed the occupant's comfort prediction method under highly non-uniform condition and unsteady conditions and they are establishing new standard. In this investigation vehicles with an idle stop function have been investigated with vehicle stopping at red lights causing a highly non-uniform and unsteady cabin air temperature. Thermal sensation of occupants have been predicted during the above condition using data from the thermal manikins. Hence, a newly developed methodology by the authors will be presented to determine occupant comfort as a function of equivalent temperature. A detailed and thorough information will be presented in this paper. * Correspondence with this author
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