辅助动力单元启动过程扭转振动的PID控制

PID Control on the Torsional Vibration of an Auxiliary Power Unit During Starting

本文中首先建立了某混合动力汽车辅助动力单元的扭振动力学方程和仿真模型,给出了发动机激振转矩和电机控制转矩的解析表达式,通过台架试验对模型进行了验证与参数调整。接着利用加权方式将动力性、舒适性和经济性等多目标要求定义为单目标性能评价函数,并通过敏感度分析确定各权重系数。然后基于非线性状态方程设计PID控制策略,对系统扭转振动进行主动控制。最后应用算例分析系统参数和控制参数对控制效果的影响。仿真结果显示:PID主动控制能有效降低APU在启动过程中的扭振而不显著增加能耗与启动时间;电机转矩响应时间与控制参数对控制效果有较大影响。

Firstly the kinetic equations for the torsional vibration and a simulation model of the auxiliary power unit( APU) in a hybrid electric vehicle are established in this paper,with the analytic expressions for engine excitation torque and motor control torque given,and a bench test is conducted for model verification and parameter adjustment. Then the multi-objective requirements of power performance,fuel economy and ride comfort are transformed into a single-objective performance evaluation function by means of weighting,with weighting factors determined by sensitivity analysis. And a PID control strategy is devised based on nonlinear state equations to exert active control on the torsional vibration of system. Finally the effects of system parameters and control parameters on control results are analyzed by a calculation example. The results of simulation show that PID active control can effectively reduce the torsional vibration of APU during starting without apparently increasing energy consumption and starting duration,and the response time and control parameters of motor torque have great effects on control results.