There are two commonly used methods: extended critical proportional band tuning method and extended response curve method. A simple method suitable for computer control proposed by Roberts P.D in 1974-simplified extended critical proportional band tuning method.
Because this method only needs to set one parameter, it is also called normalized parameter setting method.
Extended data
In many lines of analog PID algorithm, digital PID is based on analog PID algorithm, and difference equation is used instead of continuous equation. Digital PID operation can adopt effective methods. For example, the parameter tuning method of digital PID is derived from the analog PID algorithm, and there must be a premise that the sampling period is small enough.
In this case, the PID of sampling system is very close to the analog PID control of continuous system. With the development of computer control technology, digital PID control has been greatly developed. These algorithms are suitable for both incremental and positional types, and the choice of algorithms mainly depends on the actuator. Among these improved algorithms, variable speed integral is one of the best digital PID algorithms at present.
Because the digital PID integral of integral separation algorithm is determined by a limited value, it belongs to switch control, while ampere-hour integral is linear control, so it has been widely used. Incomplete differential algorithm is obviously more complicated, but its control characteristics are good, so it is more and more widely used.
reference data
Baidu encyclopedia-PID parameter tuning