A PID controller is a (closed) control loop feedback mechanism. It is used in industral control for proportional, integral and derivative feedback.

learn more… | top users | synonyms (1)

1
vote
0answers
16 views

How to infer equivalent PID controller coefficients from an existing black box ccontroller?

I have a 2 input, 2 output system that I have recorded in response to 1. steps (actually quasi-steps, with 50 ms rise time + some overshoot), and 2. sine waves from 0.5 to 50 Hz, in both open and ...
0
votes
0answers
17 views

PI compensator question

I have a RLC circuit to discover the characteristics of controlled system. The block diagram has shown below where If I add a PI compensator to the closed loop system, Q(s)=1/s,and the transfer ...
19
votes
3answers
242 views

Yogurt on a PID controller

How do you change the tuning of a PID controller to deal with changing thermal properties? The project: I am making yogurt. It cultures at 110 deg F for about half a day; you put in milk and a little ...
0
votes
0answers
34 views

Open source PID simulator

I have been searching for a open source PID simulator (kind a advanced PID simulator).Are there any free open source PID simulators available on internet?
0
votes
0answers
33 views

conversion of kp,ki values

I have tuned a pi controller with kp, ki values in integer form using matlab simulink tool.To implement the pi on dsPIC33f it a requires fractional pi controller.How to convert conventional pi values ...
0
votes
0answers
31 views

What Inf. or Negative Gain Margin means?

What Inf. or Negative Gain Margin means? I am trying to calculate the paramaters for a controller (kp,ki,kd). According to ZN method I need for a start the gain margin. My problem is that I get Inf ...
0
votes
2answers
96 views

PID and motor control by PWM

I am having a potentiometer which gives an analog voltage in range of 0-5V. I am considering this POT as throttel input for motor. If i change the pot speed increase and decrese on the basis of ...
-3
votes
1answer
40 views

Experiment to determine the relation between applied voltage and angle of output shaft of a DC Servo motor?

My project need to control the position of a DC Servo motor, but I don't know the plant model of my motor. So, I want to make an experiment to acquire the data between the applied voltage and angle of ...
-5
votes
1answer
49 views

PWM with 12V DC fan on arduino

I am using an Arduino with PWM to control two 12V DC fans....however the fan works at 12V and Arduino at 5V, what kind of circuit do i need to allow this to function to work? I would imagine that ...
0
votes
1answer
73 views

IIR filter concerns in PID control systems

The following diagram represents the system: Here comes some more description: The system input (ref or reference is zero). And actually the goal of the controller is to maintain the output of the ...
1
vote
1answer
27 views

Closed Loop 4 Sensor Control System

I have 4 on/off motors running individually (call them M1, M2, M3, M4) and 4 ping sensors (call them X1, X2, X3, X4) with a board placed in front of the motors and sensors. As the motors move forward ...
0
votes
1answer
37 views

proportional control offset

I understand that with proportional only control you have to have error or the control output goes to zero. The answer to this question Proportional controller was very informative. Mr. Lathrop ...
1
vote
1answer
51 views

PID control: What does it mean that an ideal derivative term is not causal?

On Wikipedia, it says: https://en.wikipedia.org/wiki/PID_controller An ideal derivative is not causal, so that implementations of PID controllers include an additional low pass filtering for the ...
0
votes
1answer
76 views

Do high resolution PID chips exist? [closed]

Ideally I am looking for a single chip solution to PID control where ADC/DAC resolution is a minimum of 24 bits. Does anything like this exist or do I have to put it together from separates?
-1
votes
1answer
40 views

basic understanding of PID controller [closed]

Sir my question is how integral component eliminates the steady state error and physical significance of integral and derivative component in a PID controller.
1
vote
1answer
55 views

A question about using PID to improve transient response for a DC motor

I have used PID a couple of times, but there is one thing I haven't been able to understand from any literature/textbooks. If I run a DC motor from a 12v battery for example, how can PID improve the ...
1
vote
1answer
77 views

Opamp precision PID loop without capacitors?

I am wondering if it is possible to create a hybrid PID circuit using opamps with key components whose values are programmable. Programmable resistors - no problem. But capacitors?
3
votes
4answers
87 views

How to control a blower using the analog output from a PID controller?

I built a biomass burner which is powered by a blower. For precise control of temperature I am using a PID controller PID500 from a company called selec . I passed the PID analog outuput to a VFD ...
0
votes
1answer
52 views

Simulink Modeling Problem

I posted a question recently regarding PID controllers, and it was swiftly answered. I began to work up a Simulink model and I'm running into problems with my (simplistic) model. I want to work out ...
6
votes
4answers
488 views

Misconceptions about PID Controllers

I'm currently designing an equivalent of the mass-spring-dashpot system, and during the design phase I realized I don't fully understand how PID controllers physically work. Below is an image, the ...
-2
votes
1answer
26 views

Question about the “system-block”

We're busy with a project, we are building a 'stabilized duocoper system' with two DC motors, they have to make the 'arm' stable, so when it goes more to the right the left motor has to turn more fast ...
0
votes
2answers
47 views

Sensor Tranfer Function [closed]

I've this transfermodel, my controller is a PID-controller and my sensor is this, how can I find the Tranfer Function of the sensor?:
0
votes
0answers
44 views

How to stablize an unstable system in elevator to height TF

I am new in control system design and I have a specific problem now. I have a plant which is unstable. TF is $$ H = \frac{-13.31 s^3 - 3851 s^2 + 1281 s - 773.9}{1.015 s^5 + 20.28 s^4 + 152.4 s^3 + ...
0
votes
1answer
81 views

Analog PID controller (transferfunction questions)

I have to build an analog PID controller (with op-amps), I've made a schematic: My questions: Can I build my PID controller this way? My PID tranferfunction (in the s-domain) looks like: ...
0
votes
1answer
63 views

designing PID controller using Ziegler Nichols algorithm

I'm trying to use Ziegler Nichols algorithm to design PID controller for the following transfer function: G=w^2/(2*xws+w^2), w=1 , x=0.2. so since the step response for this function is a second ...
0
votes
1answer
232 views

Setting up a PID controller in Simulink for an Arduino example project

On the internet I found this "Arduino PID Example Lab" as an introduction to PID-contole. I set up the hardware and it is working like it is diskribed in the document. Since it is possible to connect ...
1
vote
0answers
47 views

How to apply Ziegler–Nichols to a heater-termometer system?

This is not a production project (though I don't mind it having practical value), but an undergraduate thesis. I already have an onoff controller with hysteresis and that works fine. I am hoping to ...
0
votes
0answers
55 views

Ziegler Nichols PI Tuning : Integral gain too high

I am tuning my PI controller in MATLAB using Ziegler Nichols method in which my plant is the car Engine and I have to stabilize the engine speed to lets say 900 when throttle is not pressed. In order ...
0
votes
1answer
43 views

Design a P-Controller given the root locus ?

I used to have the transfer function given but here the root locus instead ... Can one help with the start...
0
votes
1answer
70 views

PID to generate different order Systems

I am looking at an old exam question and I am wondering giving a certain G(s) how can I choose the points of the zeros in a PID Controller to have a second order ...
0
votes
1answer
99 views

Build a thin line follower?

I'm building a line follower robot with just 3 sensors to follow a black line of 1cm. However the distance between my each of my sensors is also 1cm. Straight path following is not a problem. However ...
0
votes
4answers
181 views

How can i extract transfer function an unknown nonlinear system?

I am trying to do PID control for my electroservo motor system by using nichols ziegler tuning method. My system has SSI encoder output for motor feedback mechanism. I will use this knowledge for ...
8
votes
1answer
247 views

Implementation of D (differentiation) in PID

I am implementing a PID controller for motor speed control. I am done with implementing the PI control and it works perfectly fine for me. In the specification I have been told to implement a ...
0
votes
1answer
52 views

Help with Motor encoder connection with motorcontroller

I am new to building drones and bots. I started out using motors without encoders with my Roboclaw Motor Controller for my pet project. Here is the controller's link. Connection seemed simple and it ...
1
vote
2answers
163 views

PID controller implemented digitally

I've been reading articles about digital PID implementation. So, in the discrete domain, we can write the parallel form PID law, as: $$U(z) = E(z)*\left[K_p + \frac{K_iT_s}{1 - z^{-1}} + K_d\frac{1 - ...
3
votes
1answer
192 views

PI controller for PWM fans

The requirements I want to control PWM fans to maintain some HDDs in a server at about 35°C, the absolute value isn't critical, however I want the temperature to be stable regardless of the ambiant ...
0
votes
2answers
138 views

When to use PID for motor control?

I have a project involving a small robot and I need to write the firmware to control the wheels. Its not something I have done before, so I did some research. In my research I saw that some people use ...
-1
votes
1answer
209 views

FPGA vs. Arduino for a PID Controller [closed]

I'd like to use an FPGA or an Arduino asa PID controller, and was wondering which device would be better to use? It will be used in a lab, and needs to be fast. Can I get all those in an Arduino ...
2
votes
2answers
218 views

Is a Type 2a PID(ish) controller just an example of an augmenting integrator?

In a previous question I finally cracked the code on deriving for myself the transfer function for a Type 2(a) compensator like this one, built around an op amp. As it turns out, for AC analysis ...
0
votes
1answer
37 views

Equivalent block diagrams, how to infer?

Assume I have one block diagram and I want to simplify it to an equivalent block diagram, how do I find such block diagram apriori? For example, Smith Predictor structure The first pic above is ...
0
votes
2answers
150 views

Self-Tuning PID Controller to implement in a PLC without having the plant model?

I need to implement a Self-tuning PID controller in a PLC. I know the behavior of the plant (I mean, I know that if the speed is reduced the tension get high and vice versa), but I do not have a ...
2
votes
5answers
426 views

Understanding a PID controller

I have a couple of questions regarding the PID controllers; maybe it is that I have not understood the concept very well. I will formulate my question with a case: I have a system which consists of ...
0
votes
2answers
95 views

How can I quickly heat something to a given temperature with nichrome wire, while keeping the wire itself under a given maximum temperature?

I'm trying to heat a fluid to a certain temperature (under 100C) using nichrome wire, with a thermistor measuring the temperature of the fluid to allow controlling the nichrome wire using PWM and a ...
1
vote
3answers
157 views

A current controller by regulating the voltage

I need some idea of what type of controller I should use. But, I am thinking of a PID controller. Here is my problem: I have a simple circuit like this one: simulate this circuit – ...
3
votes
8answers
376 views

Why are there only PID controllers, no PIIIDDD (higher order) controllers?

Transfer function of a PID controller is: \$I\cdot s + P+\dfrac{D}{s}\$ Are there controllers like: \$A\cdot s^2 + B\cdot s + C+\dfrac{D}{s} + \dfrac{E}{s^2}\$ ? If so, are they common? Why do ...
2
votes
0answers
47 views

How to tune PID for a Y(t) = k*X(t) system?

Could I have your opinions on PID type selection? System description Here comes a very simple system: Output(t) = \$ k * (Input(t) + systemVariable(t)) \$. \$k\$ is constant and ...
1
vote
2answers
162 views

Cascade Control System - Multi-Stage Temperature Control

I am new to the forum, hopefully you can help :) I am a software engineer trying to put together a control system. My controls background is not strong, I have really only tuned PID loops via trial ...
-3
votes
1answer
298 views

PID controller DC motor Design using simulink [closed]

After playing the circuit, this circuit is showing the error. Tell me what is error in this circuit and what should be the P, I and D values for PID. ??? in block is not any error. It showing because ...
0
votes
2answers
140 views

how to map a pid controller to a process

How do you "map" the output of a PID controller to a process? Say you have a resistor, a thermometer, and a PID controller. The thermometer provides feedback, and the PID controller can control the ...
0
votes
1answer
130 views

Integral Time and KI in PID

I am working on drive to control the speed of motor using software PID. the output of PID will generate the reference for drive to run at particular speed. Here Kp and Kd will come from drive it self. ...