Usage of PID controller instead of ON OFF controller

respected sir,
I pursuing btech final year in the stream of instrumentation.sir i have a doubt while go through my project,can i use PID controller instead of using ON OFF CONTROLLER. would you please suggest me the possible ways which are going to implement in my final project intelligent wheel chair.i am eagerly waiting for your valuable acknowledgement.
thank you,
with warm regards,
BOMMAREDDY

Hi!
I am not sure if I completely understand the question but if you are wanting to do autotuning for PID there is actually a VI that will do it for you. It is called PID Autotuning.vi and can be found under the PID Control pallete in LabVIEW. The LabVIEW Help file also contains more detailed information on the inputs and outputs to the VI.
Carlton
CLD

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Hi!
I am not sure if I completely understand the question but if you are wanting to do autotuning for PID there is actually a VI that will do it for you. It is called PID Autotuning.vi and can be found under the PID Control pallete in LabVIEW. The LabVIEW Help file also contains more detailed information on the inputs and outputs to the VI.
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Dear All,
Actually my project is related to heading control of an underwater system using PID controller - A Labview Application.
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Dear nathand,
Actually I need do a heading control application of a underwater system by using PID controller by the help of thrusters.
According to this,Firstly,I have completed the rotation count measurement of the system by interfacing the compass C-100 (for checking) with the cFP controller.It is working fine.
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3)Apart from this, how can I show this concept schematically with out connecting the thruster manually? Is it possible to show the demo in chart analysis format?
Please validate the above points and guide me to start working on this task.
The rotation count measurement application, Till now I did was attached with this. Please go through the same.
Thanks and Regards,
Dinsulpri.
Attachments:
Compass_Event Structure.vi ‏18 KB

PID controller

Hi All,
I Have to design a PID controller based on standard Labview 8.2 and I've tried to do so but still facing problems with it. I think there might be a mistake in one of the connections in the PID controller. Even when I tried to simulate it with a simple transfer function, I could not get any response.
please have a look on the attach files and tell me what wrong with it .
Regards,
saed
Attachments:
final pid2.vi ‏30 KB
PID2.vi ‏27 KB

Hi saed,
there still is Rube-Goldberg in it See comments in attachment...
Best regards,
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final_pid2e.vi ‏26 KB

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Full PID control might be difficult since you would need to implement it from scratch, but simple proportional control is fairly easy. There is a good example of this in the book LabVIEW for LEGO MINDSTORMS NXT.
Message Edited by BLAQmx on 09-17-2009 09:59 AM
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Factors to be considered while designing a PID controller

Hi ,
I am designing a PID controller for a temperature control system.
What are the factors should i consider to decide the PID controller range?
I have to adjust the heater voltage to keep the process temperature under control.
How to simulate the program without actually getting the process temperature??
Will the PID Controller work with any relation (for simulation purposes)between heater voltage and process temperature??
Am not an expert in PID controller.............
could someone guide me ...........
Thanks,
radhika

Hi Radhika,
For guidelines on setting parameters of your PID controller, you can search and find good information in books and all over the web (e.g. root locus and Bode plots).
As far as LabVIEW is concerned, you might want to take a look at the Control Design Toolkit, and its manual, available here.:
http://sine.ni.com/nips/cds/view/p/lang/en/nid/13854
And you could use something like a simulate signal express VI to simulate an input to your system.
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PID controller loop

Hi,
I have a problem to control the torque's setpoint.
I'm using the example in Labview 6.1 PID controller loop.
The process variable measures the torque and it's the same value indicated in the torquetronic, but the system isn't regulate as I want.
I always have the upper limit(10V) to the servovalve,so I have 7Nm even if I put 2Nm in the setpoint box.
I'm sure that the parameters in MAX are good (to the range).
How can I regulate the torque??
My PID values are: P=0,2 ; I=5 ; D=0 Are they right??
Salutations

Hi,
I am assuming that if the voltage to the servo valve is increased, the torque increases, and if it is decreased, the torque deceases.
First, test the setup in open loop, that is, set the voltage directly to the servo (0--10V)(without using the loop), does the torque value changes accordingly, if not you have a mechnaical/electrical problem.
If it reponds, then
Start with D=0, and small values of P and I, and monitor the voltage output of the PID,
then incease P and I in small increments
In general, as P and/or I are increased, the voltage output and torque also increase. Large values will make the system torque/voltage osciilate.

Temperature control using pid controller

sir i ve a doubt that how should i control temperature at a particular value using this PID controller here i attach screen shot of my block diagram.please show me the path how should i controll
Attachments:
Capture.PNG ‏20 KB

Hi,
I am also looking for some what same situation. Did you get any answer?

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Hello,
I've implemented a PID controller on PC to control NXT Robot in this steps:
1. NXT sends the sensor value (Light sensor) to PC.
2. PC performs all calculations (PID controller and motor power for each wheel)
3. NXT receives the powers of motors and applies to corresponding motor.
With USB connection, robot follows the line very well and execution time is only 15 ms. But with Bluetooth, execution time up to 60 ms (!!) and the robot cannot follow the line properly.
Is it normal that Bluetooth has this latency? The only solution is to implement the PID controller directly on the NXT?
I've attached the robot's program.
Thanks!
Attachments:
Robot 9 (enviat).vi ‏20 KB

Bluetooth is always going to be slower than USB, and best performance would be doing the PID control on the NXT.
Can you attach your host side program as well so we can see how you are sending/receiving messages on that pc?
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The input to the PID is the process variable which is the output of the lock-in. The lock-in is processing a signal which is related to the frequency of the laser. Is the set point in frequency units or something else?
The output of the PID goes to the current input of the laser controller. The only scaling in the PID is based on the values for Kp, Kd, and Ki.
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Increasing the sensitivity of the lock-in is the same as increasing Kp in the PID. At high enough values most systems oscillate.
My first concern with oscillation would be the time delay. What are the time constant settings on the lock-in? How long does the laser controller take to respond to a command over the GPIB? Time delays in a feedback system make the system very difficult to stabilize.
The system I worked on never worked completely to my satisfaction. It always required a significant amount of manual tuning.
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I am using the PID VI to control the signal to a heater in a refrigeration test rig. When I set the output range to 4-20 (representing 4 to 20 milliamps) it seems to control OK. However, for a new device, the range must be set in amps not milliamps, and I find that when I set the output range to 0.004 to 0.02, I only get on/off control. In other words, when the process variable exceeds the setpoint by even the smallest amount, I get 0.004, and when it is less than the process variable, I get 0.02. There is no in-between.
Can anyone please explain this to me. Coupled with this, can anyone point me to a decent document that describes how this PID VI should be set up and used. I can obviously work around the problem by setting the output range to 4-20 and then divide this number by a thousand before feeding it into the output DAQ card, but I find the whole thing very confusing. I thought by having settable output ranges, the PID program would scale these values for you.
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The PID Control Toolset User Manual can be found here.
http://digital.ni.com/manuals.nsf/websearch/A25258DF0D3E3CB386256B41000BA9B9
If I read page 2-1 correctly,
reducing your "P" value by a factor of 1000 should do the trick.
Ben
Message Edited by Ben on 05-03-2006 12:27 PM
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
Attachments:
PID_Operation.JPG ‏18 KB

Usage of PID controller instead of ON OFF controller

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