What I essentially try to do is to control ICE speed with a PI controller. the model is attached to this message.
Below is the workflow that I follow:
- find model steady-state operating point
- linearize at operating point.
- validate linearization with Frequency Response Estimation
- everything good? then continue with PI tuning using Control system Toolbox.
for step 1 and 2 I use Linear Analaysis Tool.select "trim model" from operating point drop-down. then specify states/known/constrains. once, trimming is done, I get Bode plot from Linear Analysis Tool.
In the trim window, there are several variables that I don't know what to do with them. They are highlighted in picture below
Question 1) What do highlighted variables represent?
Question 2) What should be the variables specifications as state/known/constrains?
To my understanding, I selected engine speed and vehicle speeds as state variables since I want to design Engine speed controller. Correct me if I am wrong.
Question 3) How to handle linearization and operating point search for a Simscape model? MATLAB help recommends "projection-based trim optimizers" to produce better ttrimming results for simscape models.
There are few optimization methods. I don't know which to select and what should be the "optimization option" setting.
Thank you, Sajad