制动工况下未知路面附着特性识别方法

Identification Method of Unknown Road Adhesion Characteristics Under Braking Condition

路面附着特性是影响车辆制动性能的重要因素之一,而实际中车辆行驶的路面往往是未知的或非典型的。为了改善车辆在未知路面行驶时的防抱死制动控制性能,提出了一种瞬时车况路面附着特性识别方法。基于行车瞬时采样数据,结合典型路面的附着特性曲线,对未知路面附着特性的几个数据节点进行了估算。最终利用4组附着特性数据节点对未知路面附着特性曲线进行拟合,得到当前未知路面上车轮滑移率与附着系数关系曲线。将识别结果与典型路面Burckhardt轮胎路面模型进行对比,结果表明,该识别算法可利用单个滑移率-附着系数关系对未知路面附着特性曲线进行有效识别。

The road adhesion characteristics is one of the most important factors that affect the braking performance of vehicle.However,the road surface of vehicle is often unknown or atypical in practice.In order to improve the anti-lock braking control performance of vehicle driving on unknown road surface,a method of identifying the road adhesion characteristics under instantaneous vehicle condition was proposed.Based on the instantaneous traffic sampling data,combined with the adhesion characteristic curve of typical pavement,several data nodes of unknown pavement adhesion characteristic were estimated.Finally,four groups of adhesion characteristic data nodes were used to fit the unknown pavement adhesion characteristic curve,and the relationship curve between the wheel slip ratio and adhesion coefficient was obtained on the unknown pavement.