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双模式机电复合传动系统发动机起动协调控制策略研究
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摘要
双模式机电复合传动系统在行进中由纯电动驱动模式切换到混合驱动模式过程中,发动机由电机反拖起动,针对上述模式切换过程产生的冲击问题,设计了一种协调控制策略。首先应用Lagrange方程对系统进行动力学分析,建立了动力耦合机构模型,将模式切换过程分成三个阶段:电机调速接合主离合器、电机反拖发动机到点火转速、发动机主动调速到怠速。在第二阶段反拖过程中,采用最优控制理论计算出满足约束条件且性能指标较优的电机转矩轨迹,仿真结果表明,该模式切换协调控制策略可以平滑快速实现机电复合传动系统纯电动模式到混合驱动模式的切换,并将整车纵向冲击度控制在约束范围内。
During the switching process from pure electrical driving mode to hybrid mode of dual- mode electro- mechanical transmission(EMT) system,the engine needs to be started by the motors.A coordinated control strategy is proposed in order to solve the longitudinal jerk problem of vehicle caused by the switching process.Firstly,the dynamics analysis of the EMT system is presented by using the Lagrange method.Secondly,the switching process is divided into 3 stages:motor speed regulation and clutch engagement,engine start process and engine active speed regulation to the transition speed of hybrid mode.In the second stage,optimal control theory is used to find a near optimal motor torque trajectory subject to the above performance index.Moreover,to adapt to different vehicle acceleration conditions,a chart of motor torque optimal trajectory is built.The simulation result indicates that,the coordinated control strategy can realize smooth and fast mode switching process with EMT system,and the longitudinal jerk of vehicle can be effectively suppressed.
引文
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