PID Controller Design and Tuning with MATLAB and Simulink - Engine Control

This demo file shows capabilities for PID Controller design and tuning in MATLAB and Simullink.

Description

This is the demo file for MathWorks webinar "PID Control Made Easy" from September 201-

The demo shows design and tuning of PID controllers in MATLAB and Simulink.

PID Controller is used to control engine speed.

To see how to tune the PID Controller, please see the webinar and visit the page with resources on PID design and tuning:
http://www.mathworks.com/discovery/pid-control.html

• Required Products: Control System Toolbox; Simulink; Simulink Control Design
• MATLAB release: MATLAB 7.11 (R2010b)

[Arkadiy Turevskiy]

@Stefano:

The function tf that this script uses is from Control System Toolbox. As the submission description says, you need to have this toolbox in order to run these files.

[Stefano]

Hi,
running the first section of the PID_Intro.m file I have this error:
"Undefined function 'tf' for input arguments of type 'char'"
Running
which ('tf', '-all')
I found plenty of tf.m files, how can have the system focused on the correct one?
Thanks a lot,
Stefano

[Stefano]

 

[muhammad]

 

[ehs]

 

[clipix68]

In Your webinar You talked about implementing PID on digital microprocessor. What kind of microprocessor should I use if would like to do that? Can you give me few certain models? Thanks for your response

[Arkadiy Turevskiy]

@clipix68:
The reason engine starts at 2,000 rpm is that the model's initial condition is set this way. To start at a different speed, the model initial condition has to be set appropriately. This inclused two states in the plant and the integrator in the PID controller.

Take a look at this video for how to trim the model at a desired speed:
http://www.mathworks.com/products/demos/slcontrol/batchmode_trimming_and_linearization/batchmode_trimming_and_linearization.html

In the linearization GUI, specify output to be at the speed you want, keep states at steady state.

Get the resulting state values and the input value. Initialize your states and PID integrator accordingly.

HTH.
Arkadiy

[clipix68]

In your webinar you used step function with initial value of 2000 and 2200 as a final value so engine speed went from 2000rpm to 2200rpm. I would like my engine to run at diferent speeds but every time it starts from the 2000. What's the problem?

[Denise Tarbox]

For more resources on PID control, see:
www.mathworks.com/discovery/pid-control.html