Siemens S7200 Pid ine follow control

[charl]

Hi

Can anyaone please help..?

I need to bild a line following robot it will be steered and driven by pneumatics,

I need to be sent into a direction or get examples of a Pid controlled program.

Any help will do.

I dont have much experience i am still a student.

Thank You

 

[Peter Nachtwey]

This is not a simple project for a beginner. Isn't there something else you can do that would be simpler? Controlling pneumatics is very difficult because air compresses.

 

[Homer_BL]

PID is a type of regulation which has a Proportional, Integral and Derivative conponent. To begin with a regulator sysnthesis, first you must have an object model. Then you begin with analog PID (Laplace) model, and transform it into a digital (Z) form, using sampling. You can have a digitial model either in positoning or speed form. Problem with PID is how to set constants, there are some ways to do it (Ziegler-Nichols, Takahashi...) or you can use autotuning methods with relay block included.
Instead of a PID, you can use one of non-conventional digital regulators (algorhytms) like Dahlin, Dead-band, Kalman etc.).

Using these keyword in my text, you will find a lot of documentation about PID.

 

[Peter Nachtwey]

Homer_BL, what model?

How do you model a pneumatic system?
What is the transfer function in the s domain? A general symbolic transfer function will do.

 

[charl]

siemens s7200

Thank You for the help so far!

It is the siemens cyberjunkyard project...we are a group and have a project manager who is a robotics expert but we must all come up with ideas...

Thank You

 

[Homer_BL]

Hi, Peter!
Modelling of pneumatic system is simillar to modelling other mechanical, fluid or electric system. Each system can be more or less aprroximate mathmaticaly described - linear, non linear, partial differnetial quations etc...you know it.