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Questions tagged [pid-control]

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1answer
39 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
45 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
45 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 ...
1
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1answer
71 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
36 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 ...
3
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1answer
93 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
50 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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0answers
50 views

Is the following system considered to be stable or unstable?

For a plant G(s), the transfer function is given by: $$G(s) = \frac{(10s+50)}{s(s^2+20s+2500)}$$ the PID parmeters are given by: $$K_p=5135$$ $$K_i=6.731$$ $$K_d=0.01475$$ $$T_f=8.57e-05$$ The ...
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1answer
75 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 ...
3
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1answer
89 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
76 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
69 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
23 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 ...
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2answers
75 views

How does a closed loop control system actually work?

I'm currently taking classical control theory and have some questions regarding basic concepts related to closed loop systems. Let's say I have a simple servo motor controlled by an electric current....
3
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1answer
59 views

Are all motors controlled with G-Code?

So I have laser cutter. And I am thinking about buying a control unit (this one, to be exact). But my concern here is the following: If the input DXF file contains splines, they will be converted to ...
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0answers
39 views

How to make a 3 axis thruster drone fly along a line

Engineering seemed the closest to my question, but feel free to suggest a better stack exchange site :) This is something I'm doing in a game, but the principles should be similar in the real world. ...
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0answers
41 views

How can I find PID Gain in this case?

I have question about PID gain. I found some method like Ziegler Nichols method. In this method, increase gain from 0 to Kr. But, In case of 0.01 gain which is minimum operation in our controller, ...
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1answer
41 views

What's a control system architecture that can track a ramping reference signal?

It's well-known that a control system with integral control can track a constant reference signal (command) with zero steady-state error. What is needed to generate a controller that can track a ...
2
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1answer
54 views

Tricks for controlling process with logaritmich characteristics over 20 orders of magnitude

I'm building a machine that operates over 20 orders of magnitude with logarithmic process characteristics. I have tried regular PID and also all sorts of variations of PID and did not get good results....
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1answer
48 views

PID Gain Calculation

A component of a control loop is approximated by the following relation between input $x$, and output, $y$: $y = 5x^2$ During normal operation, the value of input to this component ranges between $1$...
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1answer
290 views

Cascaded PID loop and parallel PID loop

What are cascaded and parallel PID loop and what are the differences between them. I searched on google and came across few websites but still i don't understand the the two types of control loops ?
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0answers
52 views

PID control for UAV [closed]

I'm working on a deltawing model airplane where I want to implement a PID controller to stabilize the pitch, roll and yaw (which are only controlled by two elevons). However, I don't know too much ...
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1answer
95 views

Layout of a controller for controlling a water pump

I'm currently writing a simulation environment in python/c for heat networks and got to the point where I'm implementing the controls for the environment. The PID controller is already implemented and ...
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0answers
38 views

Implementing PID controller in Closed-loop system Identification

I want to identify the performance of a closed-loop feedback control system in MatLab. So, in the end I want to have poles, zeros, bode etc. of the closed loop system: yset ---(err)---[Gc]---(u)---[...
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1answer
104 views

PID tuning of a classic voltage controlled three-phase rectifier

I have a three-phase synchronous active rectifier I need to control it with a voltage oriented scheme like this: But I have no idea of how to tune multiple PIs, I'm trying to do it by trial but I ...
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2answers
866 views

How do elevators stop at the exact landing spot when reaching a particular floor?

The floor the elevator moves to, is controlled by the lift PLC with all the algorithms developed over the years, and that I understand well. What I am not able to understand is how does the lift stop ...
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1answer
467 views

How to tune a PID for a pure integrator system?

Given a plant with a transfer function of K/s, how can I tune a PID to control it? I found articles explaining how to tune an integrator with time delay, but not for just a pure integrator system.
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2answers
1k views

Replacing PID with Lead–lag compensator?

I have a vehicle (I bought it and it proprietary and I have no information about any internals) which I want to integrate into my simulation environment. So far I have a physical model of it which I ...
2
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1answer
118 views

Tuning PID Controller

I have to determinate the power (Watts) for an oven to reach the Temperature Reference. And I have been given only the function to apply power to the oven and read the temperature. I've reading the ...
0
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1answer
63 views

Cylinder position and speed control

I have cylinder model that I control with 4/3 directional valve. When 4/3DV control input is 10V, cylinder moves forward and when valves control input is -10V, then cylinder moves backward. I can get ...
1
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1answer
1k views

Using a PID to control rotation

I've been working on simulating drone flight in Gazebo (an open source robotics simulator). Currently, I'm trying to control the drone's pitch / roll rotation using PIDs. It's important to remember ...
2
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1answer
351 views

Design op-amp circuit from transfer function? [closed]

What is the best way to design a circuit based on the following transfer function: (0.0364*s)/(0.0002*s + 1) ? I am trying to design the derivative stage of a PIDF controller using op-amps EDIT: This ...
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0answers
226 views

How many controllers of output or state are available? [closed]

Im in daily basis see a lot of controller. Sliding mode PID. Fuzzy, adapttive. Controller based on lyapunov etc. But how many are they that are actually in use in industry and when do we use them? ...
4
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1answer
126 views

Model-based Ziegler-Nichols tuning of a hover PID controller

Doing a fun project to reconnect with my engineering training: I would like to design a control scheme for hovering in-place at a set altitude with a vertically-oriented propeller, rocket, etc. Right ...
0
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1answer
265 views

What type of control system is this? open loop?

Suppose I have a liquid in a container, the type of liquid is such that it expands when its temperature rises. The contrainer is marked with scale to measure the height of liquid expanded. There is a ...
1
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1answer
42 views

What is the name of my feedback procedure in control system that I am using?

I have created a self balancing robot. It uses PID control to control its pitch angle and gets the feedback from gyroscope and accelerometer. But I have not used any sensor to feedback the ...
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0answers
299 views

FOC algorithm for BLDC motor and rotor position estimation via IMU

I would like to implement the Field Oriented Control (FOC) algorithm on my STM32 board for controlling a 3 phases sensorless BLDC motor. By googling I found a very interesting Application Note from ...
3
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1answer
590 views

Suggestion to control a gimbal bldc motor for positioning

I try to understand what the PID controller of a gimbal stabilizer boards (e.g Storm32BGC: http://www.olliw.eu/storm32bgc-wiki/STorM32_Boards) does influence? From the IMU we get position and ...
0
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1answer
218 views

How do I define settling time vertical line on root locus?

I want to understand how in process of design of a controller I have to meet requirements using root locus method. I know that for the given damping ratio I need to estimate the arccos of it and ...
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2answers
102 views

Motor Controller Design Considerations

I'm working on developing a speed controller for a motor that is geared to rotate a mass. Currently, the motor in question has a step voltage applied to it and moves the mass at a relatively slow ...
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3answers
398 views

PID position control when setpoint does not require continuous force

I'm struggling with the practical application of a PID control algorithm when the set point does not require any external force to stay in position. For example, I have a geared electric motor that ...
1
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1answer
100 views

What is a PIAD controller?

I know a PID controller. Recently, I heard someone mention a PIAD controller. What is this? Is it a kind of extension of a regular PID controller? In the control engineering litterature, I have only ...
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2answers
329 views

Writing a filtered derivative term of the PID controller into the C++ code

Everywhere I look, be it a PID, lead, lag control or anything else, there are Simulink schematics with transfer functions. This is all nice for system response simulation, however currently I have to ...
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1answer
102 views

When are overshooting controllers preferred over asymptotic ones?

Disclaimer Designing the behavior of controllers is an important task for many applications. Every application needs its own requirements fulfilled. For example a CNC machine needs a controller with ...
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0answers
108 views

Theory of steady state error and dynamics of error for automatic control systems

I'm currently studying control systems specifically the mass-spring-damper system. Which is described by: $$\ddot{y}=(b/m)\dot{y}+(k/m){y}=(b/m)\dot{u}+(k/m){u}$$ Where $b:$ coeffiecient of ...
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1answer
100 views

What means the velocity constant of the integration in PI controller formulas?

I have an equation of a PI controller. What means here the velocity constant "R" exactly? $$m(t)=K(e(t)+R{\int}e(t)dt)$$ $$R=1sec^{-1}$$
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1answer
2k views

what is a quarter wave decay response after Ziegler–Nichols tuning?

Ziegler–Nichols tuning creates a "quarter wave decay". What does that mean? I cannot find anything online!
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0answers
63 views

PI-Controler: Comparison of characteristic equations

I have to design a PI-controller with zero order hold for the plant $G_s(s) = \frac{0.24}{(s+4)(s+12)}$ to meet the specifications of $\omega_n=5\,s^{-1}$ and $\zeta = 0.6$. I choose a $T=0.12\,s$ ...
2
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1answer
438 views

Is lead filter same as PD combined with a low pass filter?

I am curious to know the difference between a lead compensator (lead filter) and a PD controller with a low pass filter. From the theory I can see that the transfer function of both these controllers ...
6
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1answer
122 views

Square shaped position error

I got a position error measured by a linear encoder like in the picture below. Could anyone explain some possible reasons for this kind of shape to occur in control theory? My system looks like ...