Browse Publications Technical Papers 2019-01-1069

Optimizing the defrost vents to meet FMVSS 103 in a Byton’s electric smart vehicle. 2019-01-1069

FMVSS 103 is one on the requirements to be passed by any vehicle and it mandatory by government. It requires that the defrost mechanism be robust enough to melt the ice off the glass in -20 C ambient within 30 min. In electric cars this is more challenging than ICE cars as the heat pump mode does not operate at such low temperatures. In Byton’s smart electric vehicle due to the over sized Coast to Coast screen which lead to lack of packaging space, having a proper impingement angle was not achievable so plenty of veins and baffles were used to solve this problem. CAE/CFD was used as a powerful tool to optimize the geometry both in subsystem and whole cabin level. The CAE model is very comprehensive and includes phase-change of the ice on glass and whole cabin detailed geometry with four passengers. Afterwards, the test was conducted, and the correlation study was completed. The CAE results were in good agreement with test data which shows that CAE can be used as a reliable tool especially in the early stages of design.


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