By using the methods of optimization and theleast squares,the ramp of the cam flank is fitted with a reasonable function and thevalve lift profile of the cam flnak is with a polynomial function of high degree.

• 采用最优化计算方法和最小二乘法相结合的方法,用适当的函数拟合缓冲段实测升程数据,用整体式高次多项式函数拟合工作段升程数据。