Research On Evaluation Of Cognitive Secondary Task Driving Safety Based On Information Fusion

Traffic safety has always been one of the most serious problems in current society.According to statistics,the proportion of traffic accidents caused by drivers who participate in secondary task behavior actively when driving always stays high,which has become the main cause of traffic accidents.So far,research contents concerning the safety of secondary task driving behavior are still immature and relatively disperse both at home and abroad.Therefore,this paper will take the cognitive secondary task driving safety as research object,combining with driver's physiological characteristics and vehicle handling and running status parameters,targeting accurately and effectively at evaluating the safety level of cognitive secondary task driving,taking the exploration of the variable rule of various parameters in different driving processes as the main line,in a bid to focus on studying the evaluation index and evaluation model of cognitive secondary task driving safety deeply.The research fruits can provide technical support for research fields such as driving behavior,determination of vehicle insurance premium rate as well as the development of active safety technology.It has important theoretical significance and practical application value.The specific research contents of this paper are as follows:(1)Deep investigation and analysis on researches of secondary task driving behavior both at home and abroad were conducted,and according to the deficiencies of current research,an evaluation method of secondary task driving safety that integrated driver's physiological characteristics and vehicle handling and running status was determined.(2)Experiment scheme of cognitive secondary task driving safety was designed,experiment platform was built,driving simulation experiment was conducted,the data of driver's physiological characteristics and vehicle handling and running status in different driving processes were collected,and finally the experiment data were processed.(3)Starting from the two aspects of electroencephalogram and electrocardiogram,this chapter focused on the research of driver's physiological characteristics in the process of cognitive secondary task driving.The variable rule of the ?/? ratio of brain wave power spectrum,the heart rate,the increase rate of heart rate,the standard deviation of RR interphase,the ratio of low frequency and high frequency's mean power were statistically analyzed.Significant differences of electroencephalogram and electrocardiogram parameters in different cognitive secondary task driving were tested by taking the test method of Mann-Whitney.The ?/? ratio of brain wave power spectrum,the increase rate of heart rate,the ratio of low frequency and high frequency's mean power were determined as the evaluation indexes of driver's physiological load safety in cognitive secondary task driving.(4)Starting from the two aspects of vehicle running status and driver's handling behavior,this chapter focused on the research of vehicle handling and running status in the driving process of cognitive secondary task.The variable rule of the mean of longitudinal velocity,the standard deviation of longitudinal velocity,the standard deviation of longitudinal acceleration,the standard deviation of lateral acceleration,the standard deviation of steering wheel angle,and the steering entropy were statistically analyzed.Significant differences of vehicle running status and driver's handling behavior parameters in different cognitive secondary task driving were tested by taking the test method of Mann-Whitney.The standard deviation of longitudinal velocity,standard deviation of steering wheel angle,and the steering entropy were finally determined as the evaluation indexes of vehicle handling and running status safety in cognitive secondary task driving.(5)This paper established the evaluation model of cognitive secondary task driving safety based on the approach of AHP&FCE.Correlation analysis was made of the cognitive secondary task safety's evaluation indexes of those two aspects: driver's physiological characteristics and vehicle handling and running status.Established the evaluation index system of cognitive secondary task driving safety,identified the aggregation of evaluation factors and comments,standardized every evaluation index,calculated the weight of all evaluation indexes by using the improved AHP,determined the fuzzy judgment matrix by sine function.Finally,made fuzzy synthesis operation on weight vector and fuzzy judgment matrix,judged the safety level of different cognitive secondary task driving according to the principle of maximum degree of membership,and then verified the evaluation model based on experiment data.