基于驾驶负荷的山区二级公路纵坡路段驾驶舒适度评价研究

为定量评价山区公路纵坡路段驾驶舒适度，本文以云南省文都二级公路为研究对象，进行实车试验开展驾驶负荷研究.首先，分析上、下坡路段坡度、坡长、加(减)速度指标对驾驶负荷影响程度，运用多元回归建立驾驶负荷模型；其次，利用心率增长率的第50、85分位值划分驾驶舒适度，结合所建模型对驾驶舒适度进行阈值分析，确定不同驾驶舒适程度对应坡度、加(减)速度区间范围；最后，对模型及阈值划分合理性进行分析验证.结果表明，坡度、加 (减)速度对纵坡路段驾驶负荷皆为显著变量，而坡长与驾驶负荷仅存在弱相关性.本文模型有效，阈值划分合理，可为低等级公路驾驶负荷研究提供参考.

Evaluation of Driving Comfort on Slopes of Secondary Highway in Mountainous Area Based on Driver Workload

In order to quantitatively evaluate the driving comfort on the mountain highway slopes, this paper collects the data of the driving load by the real driving experiments on the secondary highway in Wendu City of Yunnan Province. Firstly, the driving load model is established by analyzing the influence of gradient and length of slopes, and acceleration (deceleration) on the driving load. Secondly, the 50th and 85th percentile growth values of heart rate are used to divide driving load level, and the threshold analysis of driving comfort is carried out with the established model to determine the range of gradient and acceleration (deceleration) corresponding to different driving comfort. Finally, the rationality of the model and threshold division of driving comfort is verified. The results show that: gradient and acceleration (deceleration) are significant variables for driving load, and there is only a weak correlation between slope length and driving load. The established model in this paper is effective and the threshold division is reasonable, which can provide a reference for the study of driving load on the low-grade highway.