把待辨识的过程看作“黑箱”，它只考虑过程的输入输出特性，而不强调过程的内部机理，用递推最小二乘估计算法对系统参数进行辨识-Process to be identified as a " black box" , it considers only the input and output characteristics of the process, rather than emphasis on the internal mechanism of the process, to