燃料电池汽车动力系统动态数学模型

Dynamic Mathematic Modeling of Fuel Cell Vehicle Powertrain

建立了用于燃料电池汽车功率平衡控制算法设计的动力系统动态数学模型。该数学模型包括燃料电池发动机、电机及其控制器、动力蓄电池组。采用最小二乘参数辨识方法对模型中的未知参数进行了估计。基于所建立的数学模型通过设计线性二次型调节器建立了基于状态反馈的燃料电池汽车动力系统功率平衡控制算法。离线仿真和转鼓测试结果证明:所设计的控制算法达到既定的控制目标,从而证明所建立的动力系统数学模型用于控制算法的设计可行。离线仿真同实测数据对比证明:所建立的系统动态数学模型达到了较高的仿真精度。

Constructed here is dynamic mathematic model of the fuel cell vehicle powertrain which is composed of fuel cell engine, DC/DC, power battery, DC motor and its controller, To model the powertrain, the equivalent physical model of the powertrain was abstracted firstly. Based on the equivalent physical model and characteristics of main components of the powertrain, state equations of the each component were listed, which constitute the dynamic mathematic model of the powertrain. To estimate the unknown parameters of the equations, the least square parameters estimation method was employed. Based on the mathematic model, control method of the powertrain was developed which uses full-states close-loop feedback. The results of simulation and field test are illustrated. The results show that the control method performs well and the mathematic model constructed can represent characteristics of the powertrain approximatively, and the model can be applied in subsequent design of control strategy for the fuel cell vehicle powtertrain.