Questions tagged [pid-control]

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2answers
38 views

PID or AI or other approaches to this thermal control problem?

I have this boiler controlled manually at the moment, and I am wondering what would be the most proper approach to automate this process. The boiler in this question basically burns fuel (saw dust, ...
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0answers
23 views

Servo Motor Input Voltage Equation

I'm working on a Ball & Beam project. As I'm doing it for an engineering project, I'm supposed to model the system mathematically, calculate the PID parameters, etc. to center the ball in the ...
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33 views

Is there an equation that can automatically tune a PID controller?

Is there an equation that can automatically tune PID controllers? or do I have to do manually/make an AI to do it for me?
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37 views

PI or PID-regulator for control system with hysteresis relay in inner loop

I have such control system (sorry for rough drawing :) ) $G(s)$ - stable object with proper transfer function. $1/s$ - integrator. I need to clarify, how synthesized PI or PID controller for such ...
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2answers
44 views

Discrete-time realization for continuous time domain controller/filter?

Let us say I simply design a low pass filter like (1/s+1) with the cutoff frequency as 1 rad/sec, when I implement it in real software, do I have to do the discrete-time realization? If not, what ...
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2answers
50 views

How to simulate open and close and control valve using a simple controller

I have successfully developed a mathematical model for my physical system. My objective is to control the mass of gas in and out of the system. The mass flowrate is given by: $V_f = C_d.\sqrt{2.\frac{\...
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51 views

How to get the performance index ISE and IAE for a Matlab-Simulink designed Line Follower Robot with PID control?

I am researching a method to determine the optimal PID gains for a line follower robot. The problem is, I don't know how to setup the performance index IAE and ISE in the matlab. Any tips on how to do ...
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1answer
38 views

What is the meaning of this symbol in Control System Diagram

I was reading the paper "Full-Speed Range Self-Balancing Electric Motorcycles Without the Handlebar" released in March 2016 by Professor Yang and Murakami in Keio University. I couldn't ...
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2answers
54 views

Do I need a feedback loop while testing PID controller?

This is a homework for my university course control theory. The task is simple: Test the P, the I and the D controllers separately to see the effect. We don't have to connect the controllers to a ...
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0answers
42 views

Controller to maintain a stable amplitude

I am recording a channel before and after injecting current into that channel. I control the current injection using a switch, when the switch is on current goes to the channel, when the switch is off ...
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0answers
52 views

What are some techniques for improving stabilization given a mechanical time constant?

Problem: I have a self-stabilizing system that utilizes an intertial measurement unit (IMU) attached to the hull of a vessel. The system self stabilizes by performing matrix rotations based on the ...
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21 views

Process disturbance in PI controller help

This is the project i'm working on and i'm struggling to understand one sentence which is stopping me from progressing the project. I'm struggling to understand what it means when it says to add +/- ...
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2answers
74 views

object following using pid

in short, I want to implement a PID controller that takes in distance and returns velocity. Details: I am simulating robots following each other. I wish to maintain a constant distance, ...
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2answers
202 views

How do I interpret the following Bode, Nyquist and Nichols diagrams?

I am working with an arbitrarily complicated and long-winded transfer function that looks something like this: $$ H(s) = \frac{as^4+\cdots+b}{cs^6+\cdots+ds^2} $$ where letters represent constants. ...
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32 views

Finding Derivative Gain for PD Controller

I am trying to design a PD controller $G_c(s) = K_d(s+z_c)$ with the following requirements: No overshoot, $\zeta = 1$ Settling time $T_s = 0.0002s$ The transfer function that I am currently working ...
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48 views

how derivative gain in PD controller influences tracking error

List item For a proportional and derivative feedback control, the the response and tracking error in frequency domain can be represented as $Y(s)=\frac{KG+K_dSG}{1+KG+K_dSG}S_p \\ e(s)=\frac{1}{1+KG+...
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2answers
44 views

Is controlling humidity more precise when calculating with relative or absolute humidity?

I have a tubing system where I need to precisely control relative humidity. All my sensors are giving me temperature [°C] and ...
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1answer
139 views

Is the PID just an outdated control method and state-space is superior?

So I've been wondering this for a while; is PID just a simple but slightly outdated control method / isn't state-space (SS) a far superior method in pretty much every way? SS allows for MIMO, PID just ...
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2answers
116 views

Why does accuracy of temperature PID controller drop over time and how to eliminate it?

What am I trying to control? I have a container with approximately 3*2*6 meters (width, height, length). I am controlling through PID the ...
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4answers
92 views

PID controller - Counterproductive derivative

I'm having trouble understanding the derivative part of a PID controller, because it sometimes seems to react the opposite way that I would like. Let's use a simple example where : the controlled ...
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1answer
60 views

PID Control: Is adding a delay before the next loop a good idea?

I am implementing PID control in C++ to make a differential drive robot turn an accurate number of degrees, but I am having many issues. Exiting control loop early due to fast loop runtime If the ...
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1answer
102 views

What's the difference between Fuzzy PI, PD and PID controllers?

I am investigating fuzzy control and I am a little confused, I have come across 3 models and I can't quite fathom out what is going on. In this PD+I controller, I can see the error signal being ...
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3answers
216 views

How to convert a DC motor into a servo motor using a rotary encoder and a microcontroller?

Operating/ Rated Voltage: 24V No load Speed: 350 rpm No load Current: 150mA (max) Max efficiency: 1.4 Kg-cm/300 rpm/ 14.2W/ 0.87A Max power: 4.5 Kg-cm/180 rpm/28.2W/1.4A Stall Current: 2.9 A (max) ...
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29 views

P&ID questions on reports, connection, etc

Good day to all of you. I got some questions in my mind regarding on P&ID: In electrical, symbol will have their own default reference name for example "Motor" will use "M" , ...
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0answers
15 views

Why do the anti-resonant filters in servo controllers operate on the velocity output and not position?

I've been looking into implementing a cascade controller for a motor control application that has a position, velocity, and torque control loops. Because the system we are positioning can experience ...
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0answers
34 views

Discrete measurement - continuous observer design

I have to design a controller for the above system where the two pulse generators (red blocks ) are synchronized (measurements are only available at discrete points). However, my understanding is that ...
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1answer
74 views

Tuning Feedforward + PID Controller just with Feedforward Data

Hello there, hope you are all doing well. Right now I am trying to design a Feedforward + PID Controller for KUKA youBot on simulation. Since I do not have the equation of the system, I am trying to ...
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1answer
214 views

Best PID autotuning algorithm/library for simple heater problem

It's the 21st century, anything is possible. Except for PID autotuning for a simple problem, heating/cooling system - make robust and ready to use solution. I've found only one library for PID ...
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2answers
17 views

Does it make sense to have a pressure and flow controller on a single closed line?

I have seen P&IDs in which a single line has both a pressure and flow control valve. Based on my understanding of Bernoulli's equation however this doesn't make sense to me - because ultimately ...
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1answer
66 views

Differential Equation for: Locking a laser's frequency with a PI controller

I think I have a good understanding of differential equations, so I would like to first try to understand my system in terms of differential equations before transforming my system into the more ...
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1answer
45 views

Crossflow HX tube and fin, derive Tout hot side as a function of mdot hot side in

Apparatus: Crossflow Tube and fin HX. (liquid-to-air Intercooler), Hot Side: Tube side, gas flowing internally Cold Side: fin side, water flowing in crossflow Goal: Generate an environment in "...
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1answer
68 views

Is there any other controller than PID Controller?

I have been given a Project to search for a controller having better transient response than PID Controller. I searched but I didn't find any research paper on it. All are talking about improving PID'...
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2answers
109 views

Analog PID Controller/Filter delay and stability

recently I had an exercise where I had to build and measure an analog PID controller/filter. The starting point was this circuit. This is a tamed PID controller implemented with a single opamp. ...
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1answer
76 views

Adapting PID controller parameters using expert rules

I use the following equation to calculate a control signal of a time-discrete PID controller: $$ u(k) = u(k-1) + K_{R} \cdot \left(1+ \frac{T_{0}}{2 \cdot T_{I} }+ \frac{T_{D}}{T_{0}}\right) \cdot e(k)...
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1answer
29 views

AC voltage b/w DC power supply o/p and Ground

I have various Phoenix Contact Mini DC Power supply units (Pheonix Contact MINI-PS-100-240AC-5DC). It gives the correct DC Voltage across output terminals, as its supposed to. But I also noticed that ...
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1answer
75 views

Zeroing a ventilator's volume measurement in the face of drifty sensors

I'm a software engineer working with http://respira.works to build an open-source ventilator for COVID-19. Notably, I'm not a controls person or a hardware person, so please forgive me. Background ...
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1answer
43 views

What is Dissipitative Control?

I am reading an article that says: stabilize the multi-vehicle system to one of its local minima via dissipative control And other that deals with dissipative system: (PID) controllers is ...
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1answer
49 views

Using Integral gain for motor positioning

I'm struggling to see how Integral gain is used for motor positioning. Suppose we have an AC motor (with a 2048PPR encoder on the shaft) connected to a winch which drives an object forwards and ...
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0answers
35 views

Is this function common in PID controllers?

I'm reading some old microcontroller code for a PID algorithm. There's a strange function (to me) that seems to work like this: $output = \frac{1}{n}input + \frac{n-1}{n}previous\_output$ The value $...
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1answer
43 views

Tuning a cascaded attitude and attitude rate PID controller

Assume that I have an object in 3D, and I want to have a controller that stabilizes its orientation (also referred to as "attitude"). To be sure we are clear: attitude is measured in "degrees" or "...
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2answers
264 views

Increasing Kd in PID control loop

Why does increasing derivative gain $K_d$ in a PID controller loop lead to a reduction in overshoot and an increase in rise time? This is not a homework question, it is a question to improve my ...
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1answer
120 views

Does this PID-like algorithm make any sense for a solar inverter?

The application I want to implement the control of a photovoltaic inverter. The goal would be to keep the consumption of a microgrid (the power absorbed from the grid) to a constant value. Notes: I ...
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3answers
131 views

Can I charge 18650 Li-ion cell from 5 V USB?

I've got a flashlight with a 3.7 V 18650 cell that charges with a 3.5 mm barrel plug. They provided adapter that says 4.2 V +/- 0.5. Can I use a 5 V USB to barrel plug adapter to charge it? UPDATE ...
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1answer
43 views

Stepper motor speed control problem

For brushless DC motors we have hall sensors to keep track of rotor; however, for stepper motor we don't know the actual position of the rotor and therefore while changing pulses with some speed it ...
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1answer
35 views

Any idea about what does this image represent in control systems?

I just need a hint , I know it's out of context but that's how I found it in a Facebook group, I thought someone might have seen this before, I study automation and I know that Kp is the proportional ...
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1answer
64 views

analysis of PD controller vs static-gain

I have a plant $G(s)$ which gives position and velocity as output $$ G = [G_{ru}(s)\quad G_{vu}(s)]^T $$ where $G_{ru}$ is the integral of $G_{vu}$, and $u$ is the input to the system. Now if I want ...
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2answers
126 views

Finding coefficients for a PID controller that minimize the integral of the squared error (ISE)

The problem The problem is to find the coefficients for the P, I and D terms of a PID controller used to regulate the object that minimize the the integral of the squared error (ISE): $$Q = \int_0^\...
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1answer
96 views

Is it necessary to use PID control in my use case?

I have a workflow of two functions. Both of them aggregate the items that are receiving and only the first is adjustable. I mean that I can decide how many items to aggregate on the first function <...
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1answer
71 views

Limiting PID controller's output making the plant unstable and untunable

I am using the PID block in Simulink and limiting the output to (+/-)5. The plant becomes unstable and untunable after putting these limits. The plant is stable and tuneable otherwise if no limits are ...
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36 views

Design op-amp circuit from transfer function

What is the best way to design a circuit based on the following transfer function: $$T(s)=\frac{9216}{(s^2 + 48s + 9216)}$$