Autonomous personal mobility vehicle (APMV) is a miniaturized autonomous vehicle that is used in pedestrian-rich environments. In addition, the open bodywork design of APMVs exposes passengers to the communication between the eHMI deployed on APMVs and pedestrians. Therefore, to ensure an optimal passenger experience, eHMI designs for APMVs must consider the potential impact of APMV-pedestrian communications on passengers' psychological feelings. This study discussed three external human-machine interface (eHMI) designs, i.e., eHMI with text message (eHMI-T), eHMI with neutral voice (eHMI-NV) and eHMI with affective voice (eHMI-AV), from the perspective of APMV passengers in the communication between APMV and pedestrians. In the riding experiment, we found that eHMI-T may be less suitable for APMVs. This conclusion was drawn based on passengers' feedback, as they expressed feeling awkward during the ``silent period'' because the eHMI-T conveyed information only to pedestrians but not to passengers. Additionally, the affective voice cues on eHMI improved overall user experience of passengers, leading to higher ratings for both pragmatic and hedonic quality. The study also highlights the necessity of considering passengers' personalities when designing eHMI for APMVs to enhance their experience.

翻译：自主个人出行车辆（APMV）是一种用于行人密集环境的小型化自动驾驶车辆。此外，APMV的开放式车身设计使得乘客暴露于车载eHMI与行人之间的通信中。因此，为确保最佳乘客体验，APMV的eHMI设计必须考虑APMV-行人通信对乘客心理感受的潜在影响。本研究从APMV乘客的视角，探讨了三种外部人机界面（eHMI）设计，即文本信息eHMI（eHMI-T）、中性语音eHMI（eHMI-NV）和情感语音eHMI（eHMI-AV），用于APMV与行人之间的通信。在骑行实验中，我们发现eHMI-T可能不太适合APMV。这一结论基于乘客的反馈，他们表示在“静默期”感到尴尬，因为eHMI-T仅向行人传递信息而未向乘客传递。此外，eHMI上的情感语音提示提升了乘客的整体用户体验，使实用品质和享乐品质均获得更高评分。本研究还强调了在设计APMV的eHMI时考虑乘客个性以增强其体验的必要性。