Abstract
In this study, electroencephalogram (EEG), photo-plethysmography (PPG), and surface temperature measurements of subjects were taken while performing a driving simulation when the cabin and vent discharge air temperature in summer were changed from discomfort to comfort conditions. Additionally, subjective questionnaires were used to analyze the subject’s thermal comfort under the various driving environments. As a result, the surface temperatures of the forehead, left hand, right hand, and abdomen of the subject during driving were reduced by 2, 0.97, 2.18, and 5.86 °C, respectively, by operating a 12.5 °C vent cooling function at a cabin temperature of 35 °C. As a comprehensive analysis of the subjective survey, PPG, and EEG results, total power (TP), the standard deviation of N-N interval (SDNN), and the root mean square of successive differences (RMSSD) of subjects increased and stress index decreased at cabin and vent discharge air temperatures of 30–27.5 °C and 16.5–18.5 °C, respectively. Furthermore, the relative sensory motor rhythm (SMR) wave and concentration index (CI) of the frontal lobe tended to increase under the same temperature conditions. Accordingly, it was confirmed that these temperature conditions provided a pleasant driving environment for the driver and increased concentration on driving.
Highlights
As industry has developed, transportation technologies have developed
Because the heating, ventilating, and air-conditioning (HVAC) system in an electric vehicle uses electricity, the air flow and temperature distribution in the car cabin are important for saving energy and providing effective cooling or heating
The bio-signals—EEG, photo-plethysmography (PPG), and skin temperature—of the subject were measured, and subjective surveys—thermal sensation vote (TSV), comfort sensation vote (CSV), and concentration level vote (CLV)—were conducted to investigate the thermal comfort of the driver under solar radiation according to the discharge air temperature of the vent and cabin temperature
Summary
Transportation technologies have developed. Car ownership has reached more than one car per household in some developed countries. Experimental studies on temperature control methods were mostly conducted to provide a comfortable thermal environment according to the type of air conditioner. In this study, to simulate the interior of a car during a hot summer day, the temperature and humidity were controlled in a thermal environment chamber, and a solar simulator was used to simulate the solar radiation condition In this environment, the bio-signals—EEG, photo-plethysmography (PPG), and skin temperature—of the subject were measured, and subjective surveys—thermal sensation vote (TSV), comfort sensation vote (CSV), and concentration level vote (CLV)—were conducted to investigate the thermal comfort of the driver under solar radiation according to the discharge air temperature of the vent and cabin temperature.
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