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基于MLS算法的汽车点火线圈铁芯磁化曲线拟合

Keywords: 点火线圈,铁芯,硅钢片,磁化曲线

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Abstract:

针对已有点火线圈建模方法因忽略铁芯磁化过程而导致精度较低的问题,基于局部近似的思想利用移动最小二乘方法对其基本磁化曲线进行拟合.为抑制拟合中的粗差数据干扰问题,利用初次拟合误差判定实测数据中的粗差点,并通过二次拟合修复粗差数据,拟合后的总体平均相对误差低于0.53%.在此基础上,将拟合后的曲线代入到点火线圈的等效磁路-电路计算模型中,计算得到了火花电流、火花电压与火花能量的仿真波形与数值,通过与实际测试的波形对比,验证了拟合算法的有效性和合理性,为点火线圈性能分析和结构设计提供了理论依据.

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