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At present, the existing predictive models of overall thermal sensation cannot accurately evaluate occupants’ feelings under vehicle cabin conditions. In this work, aiming at the overall thermal sensation evaluation of vehicle occupants in winter heating condition, the interrelations between the occupants’ local thermal sensations and the overall thermal sensation are analyzed using the experimental results of physical tests. It reveals that the overall thermal sensation is significantly affected by the local thermal sensation at extremities, which are called the extreme local thermal sensations. The overall thermal sensation evaluation model is established using the Support Vector Machine method, which is based on the maldistribution of the local thermal sensations, the extreme local thermal sensation, and the mean value of the local thermal sensations. The prediction accuracy of the training set and the verification set are 80% and 71.11% evidence the application potential of the Support Vector Machine evaluation model.

The sound quality of a turn signal sound is directly related to the driving safety and influences comfort during driving. A turn signal sound and interior noise always exist simultaneously while driving. However, none of the studies are performed to observe and control the change of a turn signal sound when the vehicle interior noise was changed. Therefore, this paper develops a method to evaluate and control the warning effect of a turn signal sound masked by vehicle interior noise. First, the turn signal sound and the vehicle interior noise at different speeds are measured and the time-frequency characteristics of the turn signal sound is analyzed. Second, the pairwise comparison method is applied to subjectively evaluate the warning effect of the sounds and the warning effect of the turn signal sound at 6~speeds relative to that at 40~km/h was obtained. Third, a new hearing threshold evaluating the warning effect is developed and used as a sound metric. This metric is employed to evaluate objectively the warning effect of warning sounds at different speeds. The subjective evaluation results are consistent with the objective evaluation results, which confirms the validity of objective evaluation. To keep the warning effect of the warning sound during the driving, two methods of controlling the turn signal sound are proposed and will be researched further in the future.

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