車室内温熱環境とドライバーの眠気との関係

抄録

Recently, traffic accidents caused by the drowsy driving are frequently featured by medias. The system capable of catching the sign of drowsiness and alert the driver to prevent him from drowsy driving is highly demanded. The purpose of this research is to evaluate the impact on driver drowsiness by the cabin thermal environment, especially focusing on the effect during winter season and evaluate the effect of the cooling stimulation within 3℃ difference around the initial temperature.

In this research, we measured the blood pressure time history data of the subjects by using continuous sphygmomanometer changing the temperature inside the simulation chamber. From the measured data, one of the evaluation indexes of drowsy level, i.e. RR interval was extracted to evaluate the impact on driver drowsiness by the cabin thermal environment. Moreover, we evaluated the drowsy level change of the subjects when cooling stimuli was loaded. In detail, we calculated the index of parasympathetic nerves-- nHF(Ratio of HF among Component over 0.04Hz), the index of sympathetic nerves-- LF/HF(the ratio of Low Frequency Power Spectrum Intensity and High Frequency Power Spectrum Intensity), then, evaluate the effect of the cooling stimuli by comparing nHF，LF/HF values prior to and after loading cooling stimuli.