This study investigated the effects of the odor type and concentration adjustment modes of olfactory stimulation on fatigue in young drivers. A multidimensional analysis was conducted using driving simulator data, the Karolinska Sleepiness Scale (KSS), and physiological indicators such as heart rate (HR) and HR variability. Under dynamic incremental concentrations, peppermint odor significantly reduced KSS fatigue scores and mean HR while elevating the root mean square of successive differences, indicating increased parasympathetic activity. Specifically, compared with the mild odor (lavender) under constant concentration, peppermint under dynamic incremental concentration most effectively alleviated fatigue, leading to a significant reduction of 18.7% in KSS scores, a 5.3% decrease in mean HR, and a 30.1% increase in root mean square of successive differences. Conversely, lavender odor at a constant concentration showed a certain degree of fatigue relief. Incremental concentrations countered the sensory adaptation and sustained driver fatigue reduction more effectively. These findings provide insight into the design of olfactory stimulation parameters for intelligent cockpits. Future research should prioritize road validation, analyze the heterogeneity of users' olfactory perceptions, and optimize dynamic concentration adjustment mechanisms. This study promoted the application and development of olfactory stimulation to reduce driver fatigue.
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