ISG电机在冷起动中的策略仿真

Simulation on ISG Motor in the Process of Cold Start on a HEV

ISG电机的控制系统决定着发动机冷起动性能,是弱混合动力系统中关键部件。它必须在很短的时间内拖动发动机至点火转速,并且要求转速过渡平稳,脉动冲击小。基于永磁同步电机(PMSM)数学模型选定矢量调速策略,采用脉宽调制器(SVPWM),因具有谐波少、响应快的优势,可作为电流调制方法。采用建立S imu link上的发动机阻力矩模型制定发动机起动策略,对冷起动过程进行仿真。仿真结果表明控制策略能够满足发动机快速起动的要求,并且升速过程平稳,受阻力矩变化影响较小,具有较好的抗负载扰动性能。

As a key part in mild hybrid system, ISG motor has a significant influence on the performance of engine＇ cold starting. ISG motor should pull engine to ignition speed smoothly in short time with smaller torque rip- pie. This paper describes a vector control of permanent magnet synchronous motor（PMSM） based on the math mod- el. With the advantages of smaller syntonic ripple and quick response, SVPWM is introduced in this paper for current control. With the dynamic running resistance torque model of an engine, a start strategy is created to simulate the ISG motor in the process of cold starting on a HEV engine. The result shows that the control strategy mentioned can start engine quickly and smoothly. The speed has a low sensitivity with variable load.