Using Estimate Parameter with a question

This help document doesn't tell where this time1 comes from, I don't know what it means, I don't know if it's wrong here, everyone knows what data this time1 is？Thank you for you help.

https://ww2.mathworks.cn/help/sldo/gs/estimate-parameters-from-measured-data-using-the-gui.html

[饕餮王]

How to get the data of time1?

[Torsten]

You have to supply these data. They represent the times when the corresponding signals input1 and position1 appeared. I don't know where MATLAB has saved these 2-column data files as inputs to the example.

Look at the x-axis in 7. under

https://ww2.mathworks.cn/help/sldo/gs/estimate-parameters-from-measured-data-using-the-gui.html

It's labelled Time (seconds).

[饕餮王]

thank you for you help.if I have a electric motor with its power & torque map,how do I define its time? I want the input to be torque ,the outport to be power,but I do not know the time value

[Torsten]

I don't have the necessary technical background, but I think "maps" usually represent the relationship between physical quantities in some kind of steady-state whereas the parameter estimation problem you referenced is based on data during a time-dependent process. So I don't think it's the correct tool for whatever you try to do, but I might be mistaken.

For stationary data, you better use some normal fitting tool like MATLAB's "fit", e.g.

[饕餮王]

Your ideas have inspired me a lot, maybe I used the wrong tool, thank you very much for your help

Answer 1

[S@m]

Hi

In the ‘Engine Throttle Model’, the variable ‘time1’ is a time series data containing the time instances at which throttle states such as the ‘throttle position’ are measured. This variable, along with the measured state data, are available in the MATLAB workspace (shown in the figure below). Every time you open the ‘Engine Throttle Model’ example in Simulink, these variables are automatically loaded into the MATLAB Workspace.

However, when working with a custom Simulink model such as the electric motor, you need to explicitly save the time variable to the MATLAB workspace by following these steps.

1) Click on the ‘MODELLING’ tab in Simulink and select ‘Model settings. In ‘Model settings’, choose ‘Data Import/Export’ option.

2) Enable the ‘Time’ option, assign a name for the variable and click ‘OK’ to save the changes (refer the below figure).

3) When you run the simulation, the above settings would save the time variable in an ‘out’ object in the MATLAB workspace. Double-click the ‘out’ object to find the time variable with the assigned name (shown in the figure below). This data can be used in the ‘Parameter Estimator’ App.

For more information on exporting data to the workspace, refer to the below documentation link.

https://www.mathworks.com/help/releases/R2025a/simulink/gui/data-import-export-pane.html