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摘要: 为了有效改善装有AMT的混合动力电动汽车(HEV)换挡品质和加速性能, 分析了换挡过程的协调控制方法, 在Matlab/Si mulink平台上建立了换挡仿真模型, 并对换挡过程协调控制进行了仿真。研究结果表明: 在各种状态切换过程中, 采用仿真模型能够对HEV换挡过程协调控制进行模拟, 在Ⅰ挡升Ⅱ挡换挡过程中, 动力中断的时间仅为1.2 s, 保证了动力传递的平稳性; 提出的改善车辆加速性能的改进措施与优化控制策略, 使车辆0~100 km.h-1加速时间由14.82 s降低到12.39 s。Abstract: For improving shifting quality of hybrid electric vehicle(HEV) with automated manual transmission(AMT), an integrated gear shifting control method was introduced.Five measures of improving vehicle's accelerating performance were provided to optimize shifting control strategies. A shifting simulation model was established on the platform of Matlab/Simulink, and the simulation of integrated gear shifting control was performed. The result shows that the model is capable of simulating the gear shifting process under various state-switches. The time of power break-up is only 1.2 s in the gear shifting process from gear Ⅰ to gear Ⅱ, so the method ensures power smooth transfer.The accelerating time of 0~100 km·h-1 is improved from 14.82 s to 12.39 s, so the measures are effective.
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图 3 踏板开度、车速和半轴转矩的仿真结果
Figure 3. Simulation results of pedal openings, vehicle speed and half shaft torque
图 4 发动机与电机的转速和转矩的仿真结果
Figure 4. Simulation results of speeds and torques for engine and rotor
表 1 改进措施及其0~100 km·h-1加速时间
Table 1. Improvement measures and accelerating times of 0~100 km·h-1
序号 改进措施 加速时间/s 0 换挡协调控制中只有发动机和电机调速 14.82 1 在0基础上挂挡结束后、离合器接合前即恢复电机动力 14.43 2 在1基础上提高换挡点原动机转速 14.18 3 在2基础上改为Ⅰ挡纯电动, 并提前换Ⅱ挡 13.35 4 在3基础上提前起动发动机并为换Ⅱ挡调速 12.75 5 在4基础上加入发动机调速断油和ISG辅助调速 12.69 6 在5基础上整车质量减轻50 kg 12.39 
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