Introduction - If you have any usage issues, please Google them yourself
Since the PID control algorithm is simple, wide adaptation, robustness, etc., is the current process of industrial production the most widely used control algorithm [1,2]. Control system using PID control and put into operation in the formal parameter tuning must be carried out before work, relied heavily on the experience of skilled operators and technical personnel, or some general tuning formula. 1984 KJ Astrom raised in relay feedback controlled process under the observation of limit cycle oscillations, the basic characteristics of the process of the limit cycle characteristics can be determined, and then calculate the PID control parameters [3-5]. This method saves a lot of technical work