电磁耦合无级变速器混合励磁特性研究

Mixed Excitation Specialty of Electromagnetism Continuously Variable Transmission

电磁耦合无级变速器(EMCVT)的磁场由两部分组成,即由永磁极产生的恒定磁场和由直流辅助励磁线圈产生的可变磁场构成混合励磁。运用三维有限元法分析了辅助励磁的磁场特性,建立了辅助励磁的数学模型,设计了辅助励磁模糊控制器。以发动机低油耗工作点为优化目标,建立了整车的控制仿真模型,并就指定发动机油门开度下的开环控制进行了仿真。结果表明:无论汽车是在起步、加速还是在遇阻力扰动过程中,EMCVT控制器均能保证发动机工作点的良好跟踪,与装备五挡AT的常规汽车相比,装备EMCVT整车的发动机能更接近工作于最小燃油消耗曲线上,发动机的工作效率明显提高。

The magnetic field of electromagnetism continuously variable transmission （EMCVT） was consisted of two parts called mixed magnetic field ,which were the permanent and the assistant magnetic fields. The permanent magnetic field was generated by the permanent magnetic pole and the assistant magnetic field （AMF） was generated by the direct current coil. The AMF was analyzed in three dimensional finite method. The mathematic model of the AMF was set up and AMF fuzzy logic controller was designed. The controlling simulation model was set up based on the lowest engine fuel consumption. The simulation was carried out in open loop condition which was the destined throttle angle cycle. The results showed that the EMCVT controller can follow up the optimized engine operating points in all modes such as the start - up mode,the accelerating mode,the resistance disturbing mode and so on. The engine operating curve of the EMCVT vehicle was more close to optimized operating line than that of the five speed automatic transmission vehicle. The engine operating efficiency of the EMCVT vehicle was improved distinctly.