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.

@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

Couple of additional comments:
1) PID Controller block in Simulink has an option to turn anti-windup protection on. Here is the doc for this block:
http://www.mathworks.com/help/toolbox/simulink/slref/pidcontroller.html

For a comprehensive collection of demos on tutorials on PID Control with MATLAb and Simulink, see this page:
http://www.mathworks.com/discovery/pid-control.html

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

very good