说明：  无刷电动车控制器C代码 PIC16F877电动自行车驱动系统 电动车双闭环程序，采用双闭环方式控制电机，以得到最好的zh转速性能，并且可以限制电机的最大电流
(brushless electric vehicle controller C code PIC16F877 electric bicycle drive electric cars double-loop process, double-loop control motor, to get the best en speed performance, as well as limiting the maximum current motor)