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并联混合动力电动汽车在动力切换过程中需要进行协调控制。以并联混合动力电动汽车在状态切换过程中总转矩不发生大的波动为控制目标,建立并联混合动力电动汽车整车动力学模型,对动力切换过程进行分析。考虑离合器接合过程中滑磨功和纵向冲击度这2个相互制约的性能指标,根据极大值原理,将二次型最优控制算法运用到传动系统控制。以总转矩波动不大为目标泛函,并以离合器压力变化率和电机转矩变化率为控制对象,设计了最优控制器并进行了仿真。仿真结果表明,动态协调控制算法能有效控制发动机和电机的动力切换过程中的转矩波动,改善车辆行驶平顺性,减小离合器磨损,保证状态切换过程中动力传递的平稳性。
Parallel hybrid electric vehicles in the power switching process needs to be coordinated control. Taking the total torque of parallel hybrid electric vehicle during the state switching as a control target, the whole vehicle dynamic model of parallel hybrid electric vehicle is established and the power switching process is analyzed. Taking into account the mutual constraint of sliding friction and longitudinal impact during the clutch engagement process, the quadratic optimal control algorithm is applied to the transmission control according to the maximum principle. Taking the total torque fluctuation as a target function, the optimal controller is designed and simulated based on the change rate of the clutch pressure and the torque change rate of the motor. The simulation results show that the dynamic coordinated control algorithm can effectively control the torque fluctuation during the power switching process of the engine and the motor, improve the ride comfort of the vehicle, reduce the wear of the clutch and ensure the power transmission smoothness during the state switching.