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This article mainly introduces "what are the PID parameter settings and adjustment methods". In daily operation, I believe many people have doubts about PID parameter setting and adjustment methods. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "PID parameter setting and adjustment methods". Next, please follow the editor to study!

PID control is widely used in industrial control and other industries. The C language implementation of PID algorithm is relatively simple, and there are a large number of routines on the network. Here, geek Jun mainly introduces two methods of PID parameter tuning.

Method one

Setting of PID parameters: it is based on experience and familiarity with the process, tracking and setting curves with reference to measured values, so as to adjust the size of P\ I\ D.

Engineering tuning of PID controller parameters, the empirical data of P.I.D parameters in various regulation systems can be referred to as follows:

Temperature T: temperature 20: 60% recording 180: 600: Dept 3-180 s

Pressure P: Pang 30mm 70% pm 2400 180s

Liquid level L: Please 20: 80% reagents 60: 300s

Traffic L: Please 40 percent, 100 percent, minutes 6 seconds.

I have found it in the manual and have actually tested it. It is convenient and accurate to apply to the traditional PID.

1. First of all, set the I-score D to 0, that is, only use pure proportional control, preferably with a graph, adjust the P value to a critical oscillation state within the control range, and record the Ts of the critical oscillation at the same time.

2. P value when K p value is equal to pure proportion.

3. If the control precision is 1.05%, set the

Ti=0.49Ts;Td=0.14Ts;T=0.014

If the control precision is 1.2%, set the

Ti=0.47Ts;Td=0.16Ts;T=0.043

Control accuracy = 1.5%

Then Ti=0.43Ts;Td=0.20Ts is set.

This method has not been tested by the author, the following is a netizen's evaluation of this method:

"the debugging time is greatly shortened. If the integration time is lengthened, the magnification is reduced. What is obtained is the stability above 1000rpm, at the expense of the rapidity of the system adjustment after the sudden addition of the system. According to the principle of consideration, you can master the adjustment index." Please consider and leave a message for discussion.

Method two

General principles of 1.PID debugging

a. When the output is not oscillating, the proportional gain P is increased.

b. When the output does not oscillate, the integral time constant Ti is reduced.

c. When the output does not oscillate, the differential time constant Td is increased.

2. General steps

a. When the proportional gain P and the proportional gain P are determined, the integral and differential terms of PID are removed first, generally, Ti=0, Td=0 and PID are adjusted in pure proportion. Input is set to 60% 70% of the maximum allowed by the system, and gradually increase the proportional gain P from 0 until the system oscillates; in turn, the proportional gain P decreases gradually until the system oscillation disappears, record the proportional gain P at this time, and set the proportional gain P of PID to 60% and 70% of the current value. Proportional gain P debugging is complete.

b. After determining the integral time constant Ti proportional gain P, set a larger initial value of the integral time constant Ti, and then gradually decrease the Ti until the system oscillation occurs, and then in the reverse direction, gradually increase the Ti until the system oscillation disappears. Record the Ti at this time, and set the integral time constant Ti of PID to 150% of the current value. The integration time constant Ti debugging is completed.

c. To determine the integral time constant Td, the integral time constant Td generally does not need to be set to 0. To set it, take 30% of when it is not oscillating, in the same way as to determine P and Ti.

d. The system is adjusted jointly with no-load and with-load, and then fine-tune the PID parameters until the requirements are met.

At this point, the study of "what are the PID parameter settings and adjustment methods" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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