How to get Non-linear state space equations of a model (including blocks of vehicle dynamics toolbox)?

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Kartikey Chauhan
Kartikey Chauhan on 19 Jul 2021
Answered: Khaled Aljanaideh on 10 Sep 2021
I want to get the non-linear state space equations of wheel block, taking the input as brake pressure and output as longitudinal slip. I want to design Sliding mode control for longitudinal slip control, therefore I need the non-linear state space model.
I have used system identification toolbox but it is giving only 6-7% best fit data which is not useful for controller design.

Answers (1)

Khaled Aljanaideh
Khaled Aljanaideh on 10 Sep 2021
Hi Kartikey,
There are currently no features in the system identification toolbox that generate a nonlinear state space model from input-output data. However, if you have a state space model of the system and you would like to estimate the values of some parameters of this model, then you can consider estimating a nonlinear greybox model, please see this documentation page:
There are several examples on how to estimate a nonlinear greybox model, please see this page
https://www.mathworks.com/help/ident/examples.html?category=nonlinear-grey-box-models&s_tid=CRUX_topnav

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