连续下坡路段刹车毂温度预测分析与应用研究

Study on Temperature Prediction Analysis and Application of Brake Hub in Continuous Downhill Section

我国将重型车辆刹车毂的温度作为控制纵坡设计的依据,但随着交通运输行业的发展,主导车型从12 t重车模型逐渐转变为30 t、40 t、49 t的重型车,此类车辆以原纵坡控制指标难以保障安全行驶。为了详细分析这一安全性偏差,基于载重货车刹车毂温度预测模型,以12 t、30 t、40 t与49 t的重型车辆为研究对象,对溧阳至宁德高速公路某连续下坡路段刹车毂温度进行预测。结果表明,大型及以上重车在极限指标下确实存在安全性风险,且其风险与车重及下坡距离呈正相关;结合案例现场地形,分析了目标路段载重车制动失效区域,并基于下坡路段重车能量控制原理,确定了工程措施中避险车道设置及重车能量综合控制措施。

In China,the temperature of the brake hub of heavy vehicles is used as the basis for controlling the design of longitudinal slope.However,with the development of the transportation industry,the dominant vehicles have gradually changed from 12 t heavy ones to 30 t,40 t and 49 t heavy ones,which are difficult to drive safely with the original longitudinal slope control index.In order to analyze the safety deviation in details,based on the temperature prediction model of the brake hub of the trucks,a continuous downhill section example of Liyang to Ningde expressway is carried out with 12 t,30 t,40 t and 49t heavy vehicles as the research object.The results show that there is indeed a safety risk for large heavy vehicles above under the limit index,and the risk is positively correlated with the vehicle weight and the downhill distance.Combined with the terrain of the case site,the braking failure area of the target section was analyzed,and based on the energy control principle of the heavy vehicle in the downhill section,the setting of the escape lane in the engineering measures and the comprehensive control measures of the heavy vehicle energy were determined.