To address the anxiety about battery capacity and driving range from driving electric vehicles, TRUE lab suggested an empirical index calculated by the ratio of remaining driving amount and state of charge. For example, if a driver need to ride more than expected driving range, he or she may feel anxiety.
EV drivers’ EEG data was collected from field operational test and TRUE lab extracted EEG stress index values of each subject from the data which represent EV drivers real stress level during driving. The plot below shows relationship between our suggested range anxiety index and extracted EEG stress index from one subject. Most of subjects had statistically positive relationship and this implies that suggested index may reflect EV drivers’ range anxiety.