The relationship between gear shift time and torque response time of interior permanent magnet synchronous motor ( IPMSM) in a parallel hybrid electric vehicle ( HEV) with automated mechanical transmission ( AMT) is analyzed, and based on over-modulation mode, a flux weakening strategy is proposed, which uses the difference of voltage amplitude before and after over modulation to calculate flux weakening current. The results of simulation and bench test show that the strategy proposed can raise the utility rate of bus line voltage in flux weake-ning region, attain a torque response time of 20ms without obvious low-order harmonic components of torque and current, and is superior to traditional flux weakening strategy based on output voltage closed-loop control, meeting the requirements of motor torque response for HEV application.%分析了采用电控机械自动变速器的并联式混合动力电动车换挡时间与内置式永磁同步电机转矩响应时间的关系,提出了一种基于过调制模式的弱磁控制策略,该策略采用过调制前后电压幅值的差值来计算弱磁电流. 仿真和台架实验结果表明,该策略在弱磁区域能提高稳态母线电压的利用率,且能达到最快20ms的转矩响应时间,转矩和电流无明显的低阶谐波,优于传统基于输出电压闭环控制的弱磁控制策略,满足了混合动力车用电机转矩响应的要求.
展开▼
