中文摘要：

针对装备多段液压机械式CVT（HMCVT）拖拉机在犁耕作业下的动态特性,运用动力学基本原理建立拖拉机动力学模型,包括发动机、多段液压机械式CVT变速器、中央传动和行走负载机构动力学模型。通过控制发动机油门和转速信号,仿真出拖拉机犁耕时车速、驱动力和加速度的动态响应。仿真结果表明：在调节发动机油门时车速平稳变化,而驱动力和加速度在开始调整时出现剧烈波动,而后平滑过渡直至稳定,并且牵引负载对拖拉机加速度存在明显的影响。仿真结论：装备多段HMCVT拖拉机在犁耕作业时具有良好的动态特性,为制定装备多段HMCVT拖拉机经济性最佳的动态控制策略奠定了基础。

英文摘要：

ploughing Research on dynamic characteristics of tractor , The dynamic model of tractor including dynami equipped with multi-range hydro-mechanical CVT during c model of the engine, multi-range hydro-mechanical CVT transmission, central driving and walking mechanism is set up by using the basic principle of dynamics. By controlling en- gine throttle and speed signal, the dynamic response of vehicle speed, driving force and acceleration of the tractor is sim- ulated during ploughing. The simulation results show that the speed of the engine is stable when the engine is adjusted, And the driving force and acceleration at the beginning of the adjustment appear sharp fluctuations, then smooth transition until stable, and The traction load has obvious effect on the acceleration of the tractor. Simulation results ： tractor equipped with multi-range hydro-mechanical CVT during ploughing has good dynamic characteristics, laying the foundation for formulating control strategy of tractor ＇s best economy equipped with multi-range hydro-mechanical CVT.