研究模糊算法时编写的一个小函数，曾经用于第一版XUFO上的模糊控制器，优点是计算量小，简单易用，缺点是适应性不够强，不能满足高精度的需要。建议在使用的时候可以加入误差积分，形成简易模糊PID的架构，可以提高稳定时的精度。 -Study of fuzzy algorithms written a small function, has been used in the first edition of XUFO on the fuzzy controller, the advantage of calculating the amount of small, easy to use, adaptable drawback is not strong enough, can not meet the needs of high precision. Recommended for use when the error points can be added to form a simple structure of fuzzy PID can improve the accuracy of stability.