BSG电机励磁电流观测器跟踪控制

Field current tracing control of a BSG based on sliding mode current observer

针对弱混合动力汽车中带式驱动启动发电机(BSG)的励磁绕组驱动电路存在的非线性问题,以及发动机舱各种外部干扰导致传统的PWM技术难以使控制电流输出达到最优的问题,依据滑模变结构控制理论,采用电流观测器的方法,建立BSG电机励磁绕组驱动系统的数学模型,给出电流观测器的控制算法,利用滑模变结构控制鲁棒性好的优势对BSG电机励磁电流进行在线整定。仿真和试验结果表明,该方法的阶跃响应时间为10 ms,跟踪电流最大超调小于5%,增强了系统的自适应能力,提高了BSG混合动力轿车启动性能,并且具有较好的电流跟踪效果,降低了成本。

Aiming at the nonlinearities of belt driven starter generator＇s（BSG） excitation winding driving circuit and a variety of interference outside the engine compartment,making it difficult for conventional PWM strategy to achieve the optimal output current.According to the sliding mode control theory,a sliding mode observer approach is proposed,and the mathematical module of BSG field windings＇ driven system is established,utilizing advantages that including good control robustness to conduct online setting.Simulation and experimental results show that the step response time is about 10 ms,and the maximum overshoot is less than 5%.What＇s more,the method enhances the system＇s self adaptive capacity,improves the startup performance of BSG-hybrid cars,and has good current tracking performance,and low costing.