Questions tagged [pid-control]

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23 views

can i power a walkie from a USB battery pack?

Is there any way to use the 2.5 mm MIC/CHG port on a midland lxt118pa frs/gmrs walkie to actually power the device instead of trickle charging the aaa cells?
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26 views

How to build a flight control for quadcopter with Arduino from scratch?

I'm trying to build a flight control for a quadcopter. I have the Arduino, IMU gyro and accelerometer setup with complementary filter applied. The only thing left was to develop a flight control on ...
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3answers
38 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
24 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
27 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
38 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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43 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
79 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
36 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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1answer
20 views

Design the equivalent electric circuit (using op-amps) describing open loop transfer function G(s)

How can I convert the Standard form of the second –order system transfer function into op-amp circuit ? G(s) = wn^2 / (s^2 + 2ζwns + wn^2)
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25 views

Design op-amp circuit from transfer function

What is the best way to design a circuit based on the following transfer function: 9216 / (s^2 + 48s + 9216)
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1answer
55 views

What is the mathematical basis for the Ziegler-Nichols method for tuning a PID loop?

The Ziegler-Nichols method of tuning PID control loops has been around since the 1940's, and has been widely applied in many areas of engineering. I understand that it is really only a heuristic ...
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1answer
24 views

Transfer function for a quadcopter with linear velocity inputs

I found the control for a quadcopter using the angular velocities or thrust power as the input, but I need a model where I can set the initial and final position (for example, from (0,0,1) to (0,1,1))....
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1answer
38 views

Controls Project: Help needed finding 3rd order system

I'm in need of help finding a third-order or higher system in which I can derive a transfer function. We have a class project in which we need to find a real-life example of the system that equates to ...
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29 views

How do I get the closed-loop transfer function of the system, fitted with a PID controller, if the input valve has a transfer function?

How do I get the closed-loop transfer function of the system, fitted with a PID controller, if the input valve has a transfer function given by: $ \frac{Q(s)}{P(s)} = \frac{Kv}{(Tv*S+I)} $ Where Kv ...
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17 views

FOPDT model identification

So I'm trying to identify the model of a simple system (I'm pouring hot water (m [kg/s] into a water tank and displace the colder water inside) in order to tune a PID controller. I performed a doublet ...
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1answer
45 views

Basic question about PID controller

I am a novice in control systems and just learned about PID controller. So after watching tons of youtube videos I realized that the input of my plant is actually defined by the error. For the case ...
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2answers
48 views

Controlling temperature using PIDs on two separate controllers

I have a pellet smoker, and I am customizing it for tighter temperature control. Currently, I am controlling how much material is burning to control temperature using a PID loop. I want to achieve ...
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1answer
21 views

Limiting the integral to a time window in PID controller

Would it make sense to integrate e(t) from t - c to t instead of 0 to t for the integral part of the PID controller? What are the most common deviation from classic PID controller definition?
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1answer
40 views

Does the plant transfer function of a system change with variations in the reference variable?

I am designing a PID controller for a system that requires several step changes in the reference variable (concentration of solute in a tank) over a set period of time. I can find the plant transfer ...
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0answers
21 views

How does a digital controller's sampling period dictate the system's actuation requirements?

When selecting an actuator for a controls application - e.g. choosing a servo motor for a self-balancing robot - I understand that it's important for the actuators to have fast enough dynamics that ...
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1answer
55 views

Can i switch negative feedback to positive feedback in PID control?

I am learning Control Theory and i have a confusion about whether the following PID controllers are interchangeable or similar. Are they equivalent? Why? Is there any difference in how i would ...
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2answers
113 views

Is this a PID cascade control loop?

I'm working on a balancing robot. I'm familiar with the simple PID control loop but i can't understand this PID control loop. Is this actually a cascade control loop? The programming states that the ...
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1answer
50 views

Interpreting Nyquist plot

When implementing the control for my application I got this Nyquist plot which made me flabbergasted. If I zoom on the point $-1 + 0j$ I get the following image How do I interpret this contour going ...
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1answer
56 views

How to find Performance assessment (IAE and ISE) of a PID Controlled system?

The Integral Absolute value Error (IAE) and the Integral Squared Error (ISE) is to be analysed. A PID Controller is given as follows: ...
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1answer
32 views

How to input amplitude on a second order transfer function?

Please, I have a question that I believe it's simple to solve. I have some samples of readings from an accelerometer (unit: g) and I did a FFT (on MATLAB) on the vector generated from these samples ...
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75 views

Designing a PID Controller for Satellite Control

As an Aerospace Engineering Student, I have been trying to make a project of a PID Controller to control the attitude response of a satellite using the parameters from a project called Kufasat. The ...
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1answer
61 views

Do variables dimensions matter in PID simulation + I want the PID output to be volts?

I have a self balancing robot control loop that uses the PID controller. I feed the robot's angle (rad) to sum block that generates the error between the set point and the angle. The error then goes ...
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55 views

Derive a Transfer Function from first principles (PID, system identification, statics)

I want to derive a transfer function of my system so I can plug it into MATLAB and use the PID tuner tool. My system is a balancing beam with a motor on each end of the beam. My first principles ...
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1answer
44 views

How to tune PID for a step response

I am very much confused finding the time constant and DC gain for the below step response. The idea is to find PI gains for speed control and I am following this tutorial online Tutorial Link Motor ...
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0answers
22 views

Peak altitude control for rocket

I am trying to design a way for a model rocket to have an apogee of exactly 120 ft (or as close as possible). I am using a design similar to the split rudder of the space shuttle on the fins of the ...
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0answers
11 views

PID Controller Gain Estimation From Historic System Reponse Statistics?

What method for PID controller gain estimation, uses historic system response statistics, rather than experimental stimulation of the system, e.g. step response? This is applicable to putting costly ...
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1answer
42 views

How to design a transfer function for a Model Rocket?

I am building a roll stabilized model rocket. I am beginner at controls systems. How do I find out the transfer function of the rocket. Although, I am aware of definitions and stuff of control systems....
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2answers
125 views

What is a definitive discrete PID controller equation?

I need the equation of a discrete PID controller and I find different answers from different websites. For example, here the answer is: $$u[k] = u[k-1] + (K_p + K_i \frac{T_s}{2} + \frac{K_d}{T_s}) e[...
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3answers
323 views

PID control of a DC motor with PWM from Raspberry Pi - how to cross dead area?

I'm driving a DC motor (actually a linear actuator) with a Polulu motor controller from a Raspberry Pi. The motor drives if you ask for anything between 20 and 100% duty cycle, so there is a dead zone ...
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1answer
23 views

Equal proportional and derivative gains of PID

Is it common to take equal values for the proportional and derivative gains of a PID controller? if so what does it mean?
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2answers
251 views

Is the speed of a DC motor proportional to PWM?

I'm trying to control the speed of DC motor but unsure of the relationship between speed and PWM. I'm aware that the bigger the duty cycle, the larger the speed, but how exactly would this ...
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0answers
76 views

Is there a maximum phase margin a PID controller can give?

I'm having trouble understanding the plot attached. The bode plot here shows the bode plot of a plant to be controlled with PID. So, if I want a phase margin of 30 degrees at the bandwidth frequency, ...
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1answer
72 views

Control: control action of a PID controller with feedback

I'm programming the controller for a drone and I've got a question that may be basic, but I need to understand this perfectly to continue with the most interesting part of the project. The sensors of ...
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2answers
90 views

Books for learning PID control? [closed]

I am aiming to program a quadcopter flight controller as a personal project. To be able to do this I understand one of the fundamentals is a PID control system . So my question is does anyone have ...
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1answer
282 views

Programming a gas mass flow controller rig

I'm trying to upgrade a multiple gas flow controller, which must be capable of controlling the mass flowrates of three gases independently through one outlet line to our system, and am in need of a ...
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2answers
937 views

Can a PID controller have a simple on/off output?

The crux of a PID controller is:- output = Kp * error + Ki * integral + Kd * derivative So typically there is proportionality and a continuously varying (analogue) output. In the case of a simple ...
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1answer
63 views

The relationship between the I control and the stability margin

While I'm reading the paper, it said "The I control can makes the phase lag, so it can makes stability margin reduced." Words are not same as that, but the meaning is the same. How the I control ...
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1answer
138 views

what's wrong with this robust control scheme?

I'm learning how to control a double integrator with $H_\infty$. my model is simply $$\begin{gather} \dot{r} = v \\ \dot{v} = F/m \\ r(t_0) = 0\text{ m}, $v(t_0) = 0\text{ m/s}, m = 1000\text{ kg} \...
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1answer
372 views

How to control a multi input single output heating system?

I am trying to optimize the heat control of a test bench at our facility. The test bench is basically a pipe with an air flow that can be heated up to desired temperature. To heat the air flow up ...
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1answer
107 views

Negative gain in Ziegler-Nicholas Oscillation Method?

For a plant G(s), the transfer function is given by: $$G(s) = \frac{(10s+50)}{s(s^2+20s+2500)}$$ Using Ziegler-Nicholas method to get the parameter: $k_p = \dfrac{-1000}{3}$ and $w =-28.868j$. Is it ...
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1answer
121 views

Advantage of anti-windup

What is the definition of anti-windup? How does it impose the constraints? What are the advantages of MPC and anti-windup over each other? Does anti-windup guarantee the constraints or does it just ...
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2answers
189 views

How to control the level in multiple connected tanks at the same time?

In a coupled tanks system, what is the control strategy to simultaneously control the level in multiple tanks. In this case the actuators influence multiple control variables. The system is as shown ...
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2answers
85 views

Where should I start to be a control system engineer? [closed]

I am a telecommunication and network engineer working as a programmer and data analyst. One of my dreams was and still to be a control system engineer and to design and program a smart robots and ...
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0answers
29 views

How to control an underactuated platform with a single servo

What's the best way to control the following type of platform so that it remains balanced and upright? It's a box supported by a single leg that can pivot at the foot (F) and at the hip (H). The foot ...