基于道路载荷的柴油机工作特性研究

Research on Operating Characteristics of Diesel Engine Based on Road Load

基于车辆在起伏路面和砂石路面行驶运行,采用高速采集设备采集了发动机输出端的转速和扭矩值,构成了不同路面的道路载荷数据,利用经典的数学分析方法—雨流计数法进行了转速和扭矩分布特性的研究。结果表明:相比于驾驶习惯,路面特征对发动机运行工况的影响更大;不同路面行驶条件,发动机主要的工作转速范围不同;起伏路行驶条件下,存在很大比例的负扭矩运行工况;实际使用过程的发动机运行工况低于设计外特性和考核工况,不适于用于稳态的耐久试验方法研究。

Based on the running conditions of vehicles on the undulating and sandstone road, the output speed and torque of engines was recorded with the high-speed data acquisition equipment, which formed the road load data of different roads. The distribution characteristics of speed and torque were researched with the typical mathematical method, which called the rain flow counting method. The results show that, compared with the driving habits, the influence of road characteristics on engine operating conditions is larger. Accord-ing to the conditions of different road, the main range of operating speed is different. On the undulating road, the engine runs in most time with the negative torque. During the actual application, almost all the operating conditions are lower than the designed full load conditions and durability test conditions, and so it is not ap-propriate to research the steady durability test method with the measured road load data.