重载越野车辆高原起步响应性研究
发布时间：2019-07-12 06:40
【摘要】：针对重载越野车辆在高原环境下起步响应性差的问题,借助汽车仿真分析GT-SUITE软件建立整车模型,仿真研究了海拔因素对重载越野车辆起步过程的影响以及换挡时刻、前传动比对高原环境下起步过程的影响。结果表明:平原环境下整车起步用时14.7 s,而海拔高度4 500 m环境下用时27.2 s;相比于1 000 r/min转速换挡而言,2 000 r/min转速换挡所对应的整车起步响应时间缩短了3.9 s,因此可以通过提高起步换挡时刻对应发动机转速的方法来改善车辆的起步响应性;随着前传动比的增大,整车起步过程中的加速度增大,但是达到稳定状态时的车速减小,因此可以通过合理选择前传动比的方式来改善车辆的起步响应性。受到空燃比限制的影响,使得起步过程发动机与液力变矩器的共同输入特性与4 500 m海拔下外特性所对应的共同输入特性差别较大。
[Abstract]:In order to solve the problem of poor starting response of heavy duty off-road vehicles in plateau environment, the vehicle model is established by means of vehicle simulation analysis GT-SUITE software. The influence of altitude factors on the starting process of heavy-duty off-road vehicles and the influence of shift time and front transmission ratio on the starting process of heavy-duty off-road vehicles in plateau environment are simulated and studied. The results show that the starting time of the whole vehicle is 14.7 s in plain environment and 27.2 s in 4 500 m altitude environment, which is 3.9s shorter than that of 1000 r/min speed shift, so the starting response time of the vehicle can be improved by increasing the corresponding engine speed at the starting shift time. With the increase of the front transmission ratio, the acceleration in the starting process of the whole vehicle increases, but the speed decreases when the vehicle reaches a stable state, so the starting response of the vehicle can be improved by reasonably selecting the front transmission ratio. Affected by the air-fuel ratio, the common input characteristics of the engine and the hydraulic torque converter in the starting process are quite different from those corresponding to the external characteristics at an altitude of 4 500 m.
【作者单位】： 北京理工大学机械与车辆学院;
【基金】：国家部委科研基金项目(B2220110005)
【分类号】：U469.3
，
本文编号：2513513
[Abstract]:In order to solve the problem of poor starting response of heavy duty off-road vehicles in plateau environment, the vehicle model is established by means of vehicle simulation analysis GT-SUITE software. The influence of altitude factors on the starting process of heavy-duty off-road vehicles and the influence of shift time and front transmission ratio on the starting process of heavy-duty off-road vehicles in plateau environment are simulated and studied. The results show that the starting time of the whole vehicle is 14.7 s in plain environment and 27.2 s in 4 500 m altitude environment, which is 3.9s shorter than that of 1000 r/min speed shift, so the starting response time of the vehicle can be improved by increasing the corresponding engine speed at the starting shift time. With the increase of the front transmission ratio, the acceleration in the starting process of the whole vehicle increases, but the speed decreases when the vehicle reaches a stable state, so the starting response of the vehicle can be improved by reasonably selecting the front transmission ratio. Affected by the air-fuel ratio, the common input characteristics of the engine and the hydraulic torque converter in the starting process are quite different from those corresponding to the external characteristics at an altitude of 4 500 m.
【作者单位】： 北京理工大学机械与车辆学院;
【基金】：国家部委科研基金项目(B2220110005)
【分类号】：U469.3
，
本文编号：2513513
本文链接：https://www.wllwen.com/kejilunwen/qiche/2513513.html
