Changing gain parameter in matlab function block during simulink simulation

Hi, I need to change gain/constant parameter in Simulink during the simulation. Sometimes it need to be changed and sometimes it doesn't, so I try to do it in the Matlab function block. Anyway, I didn't find a solution without a GUI... I already tried set_param function but it doesn't work in matlab function block.

My real issue is to set PD controller until the condition isn't true. Than I need only PID controller no matter the condition.

Thanks for help in advance

function [PD, PID] = PID_switch(PID_set, error)
    if PID_set == 0
        PD = error;
        PID = 0;
    else
        PID = error;
        PD = 0;
    end
    
    if condition == 1
        PID_set = 1;
    end
end

Answer 1

[Umang Pandey]

Hi Jan,

As per my understanding, it appears that you are interested in employing the "PD" control block until a specific condition remains unfulfilled. Once this condition is met, the system should transition to the "PID" control block.

To facilitate this, I suggest utilizing the "Switch" block in Simulink. This block enables you to route one of its inputs to its output based on a specified "Threshold" parameter.

For a comprehensive understanding and examples, you may refer to the following documentation:

https://www.mathworks.com/help/simulink/slref/switch.html

Best,

Umang