PID调整（The PID adjustment）.doc

PID调整（The PID adjustment） PID parameter field setting training materials 1. Scope of application of PID controller The PID control is a traditional control method, it is suitable for temperature, pressure, flow, liquid level, etc. Almost all the scene, different scene, just different PID parameters should be set, as long as the parameter is set properly can achieve very good effect. All can reach 0.1%, even higher control requirements. 2. The significance and function index analysis of PID parameters P, I, D: y = yP + yi + yd 2.1. P parameter setting Name: proportional band parameter, unit is (%). Proportional action definition: a proportional action control output is proportional to the error size, the size of the percent of range when the error reaches the P value, the proportional action output = 100%, the P is defined as the ratio parameter. namely Yp is equal to times 100% is equal to Kp, right? Err (1) (including: yP = KP? Δ, Δ = SP - PV, 0-100%) KP = 1 / (FS)? It can also be understood that when the error reaches the range times P (%), the output of the proportional action reaches 100%. Example: for a range of 0-1300 ℃ temperature control system, when P is set to 10% FS times P is 130 ℃, shows that when the error reaches 130 ℃, the output of the proportional action is equal to 100%, the error of each change 1 ℃, output variation ratio 0.79%, if need to increase the proportion of the role of regulating ability, need to put the P parameter Settings, or set the range. The specific amount can be calculated according to the above methods. P = output full open/FS? 100% The higher the P parameter, the stronger the dynamic response and the better the ability to eliminate the error. However, the actual system is inertial. After controlling the output changes, the actual PV value change will need to wait for a period of time to change slowly. Due to the inertia of the actual system, the proportion effect should not be too strong, and the high ratio will cause the insta