【摘要】：針對重載越野車輛在高原環(huán)境下起步響應性差的問題,借助汽車仿真分析GT-SUITE軟件建立整車模型,仿真研究了海拔因素對重載越野車輛起步過程的影響以及換擋時刻、前傳動比對高原環(huán)境下起步過程的影響。結果表明:平原環(huán)境下整車起步用時14.7 s,而海拔高度4 500 m環(huán)境下用時27.2 s;相比于1 000 r/min轉速換擋而言,2 000 r/min轉速換擋所對應的整車起步響應時間縮短了3.9 s,因此可以通過提高起步換擋時刻對應發(fā)動機轉速的方法來改善車輛的起步響應性;隨著前傳動比的增大,整車起步過程中的加速度增大,但是達到穩(wěn)定狀態(tài)時的車速減小,因此可以通過合理選擇前傳動比的方式來改善車輛的起步響應性。受到空燃比限制的影響,使得起步過程發(fā)動機與液力變矩器的共同輸入特性與4 500 m海拔下外特性所對應的共同輸入特性差別較大。
[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.
【作者單位】： 北京理工大學機械與車輛學院;
【基金】：國家部委科研基金項目(B2220110005)
【分類號】：U469.3
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本文編號：2513513