How to speed up simulation time for fuzzy controllers in simulink

I have implemented fuzzy controller in simulink as uploaded at http://tinypic.com/view.php?pic=5l9t07&s=6. Fuzzy controller has two inputs with three membership functions and 9 rules.The issue is that; that the simulink is taking too long time to run it. What could be the issue. Any guidance.

[SOURABH GHOSH]

You can approximate a nonlinear fuzzy PID controller using a lookup table. By replacing a Fuzzy Logic Controller block with Lookup Table blocks in Simulink, you can deploy a fuzzy controller with simplified generated code and improved execution speed.

Answer 1

[Ryan G]

You can try running in accelerator or rapid accelerator mode, change to a stiff ode solver or breaking what appears to be an algebraic loop in the feedback with a transfer function or unit delay.

[Beenish Mazhar]

I have tried the accelator and rapid accelator mode but got compiler issues. As I am very new to fuzzy controller and simulink so can you explicitly explain about stiff ode solver;that how it would help me. Secondly as I have mentioned that I have used 9 rules for fuzzy controller; are these 9 rules large enough to make the overall system slow. Any guidance would be highly appreciated.

[Ryan G]

Did you try my last suggestion? You can add a 1/z block to the feedback loop. Try that and let me know how that works.

For compiler, you need to download a supported compiler and use the mex -setup command to tell MATLAB to use it.

[Beenish Mazhar]

Sir the issue of execution time has been resolved but output is not correct after adding this delay;its a straight line. How to tackle it?

[Ryan G]

Well the delay represents a sensor. Realistically a feedback control such as this will have some kind of delay in the feedback path. What is the sample time of the delay? Try setting it faster.

[Beenish Mazhar]

Sir previously sample time was set to -1(inhereted) so when I increased it; the straight line became little curved.The problem is still there..how to solve this problem.Secondly sir can you kindly explain how delay block acts as a sensor and why it is necessary in the model.

[Beenish Mazhar]

Any suggestion.