Design Research On HMI Of Conditional Autonomous Vehicle Based On Situational Awareness

Automation has become one of the important trends in the development of the automotive industry,as the rapid development of autonomous driving technology.However,the development has not been achieved in one step.Before the arrival of fully autonomous driving,autonomous driving technology will be in a long-term transition stage,namely,the manmachine driving stage where the driver and the system cooperate to complete the driving task,also known as conditional autonomous driving.Conditional autonomous driving brings convenience to people,but it also brings new human performance issues: it allows drivers to disengage from driving tasks and engage in tasks unrelated to driving.It also requires drivers to be ready to take over at any time.When operating conditions exceed the design scope of the system,the driver takes over the vehicle according to the takeover request.As the driver’s attention is mainly focused on tasks unrelated to driving at this time,their takeover performance will be reduced,affecting driving safety.In this context,this topic focuses on the information processing process of drivers from the perspective of situational awareness.By exploring the relationship between HMI and drivers’ situational awareness,it proposes corresponding design strategies to guide HMI design,helping drivers quickly restore situational awareness,improve takeover performance,and improve driving safety.Firstly,the topic studied the relevant theories of situational awareness,clarifying its importance in the conditional autonomous driving and its application in the design of HMI.Based on the three-level model of situational awareness,human information processing model,and human visual characteristics,the information processing model of driver’s situational awareness is constructed,which clarifies the important role of HMI in it.Through the analysis of interaction channels and physical carrier characteristics,the relevance of dashboard visual display design and situational awareness was proposed,and the research object was further focused.Secondly,the user needs and task characteristics were investigated and analyzed,and the evaluation indicators for HMI at different task stages were proposed.Based on the five element model of user experience,the design elements of the HMI were disassembled.Through a questionnaire survey,the relationship between each design element and the above evaluation indicators was explored from a design perspective,and the impact relationship between the HMI and driver situational awareness was constructed.Through typical case analysis,the commonalities and differences of various design elements at different task stages are determined.Finally,based on the variable output design prototype of design elements,experiments were designed and conducted to explore the information content composition,page layout form,and visual design direction that are most conducive to driver situational awareness recovery at different task stages.Based on the experimental results,a design strategy for HMI is proposed from three dimensions: information,layout,and visual design.On the basis of the design strategy,Changan UNI-T was used as the design carrier to optimize it.The effectiveness of the design strategy was verified through experimental evaluation of the HMI before and after optimization.This topic extends the application of situational awareness theory to the field of visual display design for HMI,and disassembles its processing process based on the three-level model of situational awareness,resulting in finer granularity and stronger practical significance.The research results of this topic can guide the HMI design of conditional autonomous vehicle,and the research methods and processes based on situation awareness can also provide reference for scholars in other related fields.