https://www.mathworks.com/matlabcentral/fileexchange/31179-hybrid-genetic-optimizer-for-grey-box-model-identification?s_tid=FX_rc3_behav
Hybrid Genetic Optimizer for Grey-box Model Identification - File Exchange - MATLAB Central
Download and share free MATLAB code, including functions, models, apps, support packages and toolboxes
grey box model
https://www.mathworks.com/help/ident/ref/nonlineargreyboxmodel.html
Nonlinear Grey-Box Model - Simulate nonlinear grey-box model in Simulink software - Simulink
Simulates systems of nonlinear grey-box (idnlgrey) models.
grey box modelnonlinearsimulatesimulinksoftware