针对换挡过程不同阶段同步器动力学模型的复杂性和不确定性，提出一种最优控制策略对驱动电机转矩进行反馈补偿和采用非线性时间最优控制对换挡电机进行位置控制，以优化整个换挡过程.试验结果表明：该混合最优控制策略能够消除换挡过程中输出转矩的振荡，明显减少了换挡时间；建立的电驱动传动系与电动换挡执行机构耦合动力学模型能够精确反映电驱动无离合器自动变速器的换挡过程；驱动电机和换挡电机混合优化控制策略可以显著改善换挡品质，为电驱动自动变速器的开发提供参考.
In order to validate the shift strategy of 2-speed automatic mechanical transmissions (2AMT) for electric vehicles, the powertrain test rig including high performance electric dynamometer is built up and experiments under different conditions are made. Then, a compound optimal control strategy is presented to improve the shift performance. In other words, a linear quadratic regulator is employed to actively compensate the drive motor torque and a nonlinear time-optimal control is used to track the actuator rotor position. The experiment results show that this optimal control strategy can not only reduce the driveline vibration, but also cut down period of the shift time. The coupled dynamic model of the driveline and shift actuator is precise enough for the analysis of shift process, and the compound optimal control strategy is effective to improve the shift quality.
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