混合动力汽车电机驱动系统传感器故障重构控制

针对混合动力汽车感应电机驱动系统可能存在的传感器故障模式,设计了一个主动容错重构控制系统.该系统能充分利用无故障的传感器信息,最大限度地维持驱动系统的控制性能,并在重构切换过程中,考虑电机转矩和转速的平滑过渡问题.此外,为提高车用感应电机驱动系统的性能,基于传统磁场定向控制(FOC)思想设计出一种新型鲁棒性PI控制器来实现电机转矩跟踪;利用滑模控制技术,设计了转子磁链-速度自适应观测器.为进一步提高交流电流传感器故障状态下电机驱动系统的容错能力,提出了用直流电流重构交流相电流的新思路.仿真研究表明,在发生传感器故障时,所设计的电机驱动系统仍能有效地保证车辆行驶过程中的转矩和速度跟踪性能以及系统的稳定性.

Reconstructed control of motor drive system in hybrid electric vehicle against sensor failures

Based on the modes of sensor failures, possibly occurring in induction motor drives in hybrid electric vehicle (HEV), an active fault-tolerant reconstructed control system is designed. The proposed system sustains the good control performance from those faultless sensors as possible and also takes into account the controller transition smoothness in terms of speed and torque transients. Moreover, in order to improve HEV operation performances, a new robust PI-based extension of the field oriented control (FOC) controller is developed to keep good torque tracking. An adaptive speed-flux observer using sliding mode is developed. In order to improve the fault-tolerant performance of the drive system, a new method of using single DC link current sensor to reconstruct all three inverter phase currents is proposed. Simulations show that the proposed control scheme can ensure the controlled system to be stable and have a good tracking performance of torque and speed when a HEV has troubles with sensors.