CODEWITHSUNDEEP
matlabcontrolssimulinksamplingmpc
user3489173
user3489173

Reputation: 45

Detecting sampling instant for a discerete controller in MATLAB/Simulink

Let us assume that I have a continuous system in Simulink to be controlled. First, I apply a Kalman filter to estimate the states of the system. In the next stage, I will use the estimated state (x_hat) in an embedded MATLAB function which calls a model predictive controller function my_mpc like so:

function [u]= emd_fcn(x_hat , r,  t,  Ts)  

      % x_hat:  estimated state,  r: reference to be tracked, 
      t: clock time,   Ts: sampling  period

      %#codegen
      coder.extrinsic('my_mpc');  % to call the function my_mpc 

       ----- % some initialization code

      if mod(t, Ts)==0

            u=my_mpc(x, r)

      else
            u=-----; % some code.

      end


end

However, since the clock time t is a variable, mod(t, Ts) == 0 will not be the case. My question is: how can we detect the sampling instant to apply the discrete mpc control input to the continuous system?

Upvotes: 1

Views: 202

Answers (1)

Phil Goddard
Phil Goddard

Reputation: 10762

You should just make the controller discrete. Right click on the MATLAB Function block, select Block Parameters, and specify a discrete sample time.

Upvotes: 0

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