Design Improvement of In Vehicle Infotainment System (IVIS) Haptic Interface

• Main Authors: JyuhnCheng, 程雋
• Other Authors: Meng-Dar Shieh
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/70864849430199349771

碩士 === 國立成功大學 === 工業設計學系碩博士班 === 101 === In this study, an improved design of the haptic interface of the In-Vehicle Infotainment System (IVIS) is presented, and its performance in regard to several aspects is verified and compared with the existing haptic interface (steering wheel control). The design of the presented interface is based on the strength of the steering wheel control, and the aim is to eliminate its shortcomings. A pilot study is carried out to survey the haptic interfaces equipped in cars. The strengths and weaknesses of each kind of interface were evaluated through think aloud observation and the Driving Activity Load Index (DALI) under real traffic driving conditions. With the obtained results and suggestions of a focus group, a new designed interface (NDI) was revealed. Prototypes of the new design and the steering wheel control (SWC), which performed the best in terms of driver preference and workload scores in the pilot study, were developed and evaluated through a driving simulation by 14 participants. Participants were required to operate a simulated IVIS with both haptic interfaces under driving conditions. Objective and subjective measurements of the driving simulation were derived. Previous studies have found that performing secondary tasks while driving has a major impact on lateral control but less influence to the driver’s longitudinal control; the same tendency was discovered in this study. The objective results show that the NDI performed better than the SWC in terms of lateral control; in this case, it meant leaving fewer lanes. Conversely, the NDI has a greater error rate when performing secondary tasks, which means making more mistakes when making selections through the menu. These results match the subjective results: participants gave higher scores to the NDI in the rapidity factor but lower scores in the accuracy factor. Concerning driving safety, the NDI was superior due to leaving fewer lanes, although participants tend to make more mistakes in menu selection. All in all, the NDI is proven significantly safer than the SWC. It was discovered that regardless whether the participant preferred the NDI or whether or not the SWC worked better, the NDI provided less lane leaving opportunities among participants. The NDI was rated lower in accuracy and higher in rapidity by the participants; these results can also be observed in the objective measurements: higher secondary task errors yet more tasks done in a single run. Through the evaluation, the NDI has proven that it has good potential to replace the current SWC interface in menu selection tasks. To eliminate secondary task error rate, suggestions to improve the NDI with better haptic feedback and minor position adjustment are mentioned in the conclusions. With interfaces providing safe operation, rich practical information is available to drivers.