信号交叉口车辆纵向加速度特性

Longitudinal acceleration characteristics of vehicles at signalized intersections

为得到车辆在信号交叉口的纵向加速度特性,在3条城市道路上开展实车驾驶试验,采集车辆在自然驾驶状态下的行驶速度、加速度、节气门开度等运行参数,提取车辆在信号交叉口加/减速过程中纵向加速度的平均值和峰值,获得了车辆纵向加速度的统计分布特性,分析了加速度与速度之间的关联度,并对加速行为中的脚操纵特征进行了研究。结果表明:减速度累积频率曲线整体高于加速度,曲线斜率突变出现在90^(th)~95^(th)分位;加/减速度均呈正偏态分布,减速度偏好值大于加速度偏好值;纵向加速度的峰值与平均值呈线性相关关系;速度较低时,减速度随速度增大而增大,而在车速达到15 km/h后随速度增大而减小;加速度先随速度增大而增大,在车速达到10 km/h后随速度增大而逐渐减小;85^(th)分位脚操纵频率为4.3次/100 m,期望速度与驱动频率呈负相关关系。

In order to obtain the longitudinal acceleration characteristics of vehicles at signalized intersections,the field driving tests were carried out on three urban roads.The operational parameters such as speed,longitudinal acceleration,and throttle opening of the test vehicles under naturalistic driving condition were collected,and the statistical distribution characteristics of longitudinal acceleration were obtained after extracting the mean and peak value of longitudinal acceleration during acceleration and deceleration at signalized intersection.The correlation between acceleration and speed was analyzed,and the characteristics of foot manipulation in acceleration were studied.The results show that the cumulative frequency curve of deceleration is higher than that of acceleration on the whole;The mutation point of cumulative frequency curve’s slop appeares with a range of in the 90^(th)-95^(th) percentile.The acceleration and deceleration are positively skewed.The preference values of deceleration are higher than that of acceleration.There is a linear correlation between the peak value and the average value of longitudinal acceleration.When the speed is low,the deceleration increases with the increase of speed,and decreases with the increase of the speed after the speed reached 15 km/h.The acceleration increases with the increase of the speed after the vehicle starts,and gradually decreases after the speed reached 10 km/h.The 85^(th) percentile foot accelerator control frequency is 4.3 times/100 m,and the expected speed is negatively correlated with the accelerate frequency.