基于准瞬态发动机模型的车辆传动系统特性分析

摘要

Dynamic characteristics of vehicle powertrain systems and modeling methods of manual transmission gear rattle were studied under idle condition,which was then validated by vehicle experiment.Firstly,for an inline four-cylinder and four-stroke engine,a quasi-transient engine model considering dynamic friction property was built.Secondly, by the lumped mass modeling method,a dynamic model of the vehicle powertrain system on idle condition was established,taking into account loose gear drag torque.The model represented dynamic characteristics of powertrain systems and gear rattle phenomenon of manual transmission.Finally,effectiveness of the quasi-transient engine model and the vehicle powertrain system model was validated by vehicle experiment results on idle condition.The research achievements will contribute to vehicle powertrain system design and mechanism analysis of manual transmission gear rattle phenomenon.%研究了怠速工况下车辆传动系统动力学特性和机械变速器齿轮敲击建模方法，并通过实车实验验证了研究方法的有效性。首先，利用实车装备的直列四缸四冲程发动机特性参数，建立了考虑动态摩擦扭矩特性的准瞬态发动机模型；其次，利用集中质量建模方法，建立怠速工况下车辆动力传动系统动力学模型，模型中详细建立机械变速器空套齿轮阻滞力矩模型，仿真分析了传动系统各部件的运动特性和齿轮对敲击强度。最后，利用实车怠速工况下的实验结果，验证了准瞬态发动机模型和车辆动力传动系统仿真模型的有效性，研究成果可进一步用于车辆动力传动系统设计开发和变速器齿轮敲击产生机理研究。