中文摘要：

为了给推土机传动系统设计提供参考，进一步提高推土机的动力性和燃油经济性，针对某大型液力机械传动的履带推土机，考虑了地面附着条件、换挡油压等因素的影响，在Simulink／Sim—Driveline环境下建立了推土机整机动力传动系统仿真模型；以表征推土机动力性和经济性的综合评价指标为目标函数，采用Simulink／SimDriveline模型与M文件联合编程的方法，对推土机传动系统的2个重要参数——变矩器有效直径和整机质量进行优化，得到了其最佳匹配组合，并将优化前后推土机驱动链轮输出功率和当量比油耗数值进行对比。结果表明：在推土机典型工况中的铲掘、运土和松土阶段，推土机驱动链轮输出功率有所提高，驱动链轮当量比油耗有不同程度的下降，推土机的动力性和经济性指标得到了改善。

英文摘要：

To provide reference for design of powertrain system, and further improve power performance and fuel economy of crawler bulldozer, with a large crawler bulldozer with hydraulic mechanical powertrain as the subject, taking factors such as ground adhesion and shift oil pressure into account, a simulation model of powertrain system for crawler bulldozer was built in Simulink/SimDriveline environment. With the comprehensive evaluation index as objective function to characterize power performance and fuel economy of crawler bulldozer, the converter effective diameter and vehicle weight, significant for crawler bulldozer＇s powertrain, were optimized based on the Simulink/SimDriveline-M file programming method, and the best matching combination was obtained. The values of output power and equivalent fuel consumption of driving wheel were compared with the original. The results show that at the stages of shovelling, earthmoving and earthloosing which are the typical working cases of crawler bulldozer, the output power of driving wheel is somewhat increased and the equivalent fuel consumption is decreased, and the indexes of the power performance and fuel economy of crawlerbulldozer are improved.