Dear Siti

you can look at the Texas Instruments controller

http://www.ti.com/lit/an/spraa76/spraa76.pdf

For TI, the hmi interface is usually easiest to implement on a LabView interface. 

Regards Gerro

If u specify the exact application for the loop, I may help u in this regards.

depends on your application, and dynamic speed response you can use Feed forward or cascade controllers.

Fuzzy base controller u can use

MPC: model predictive control

Due to the nature of your problem , I think you  should try to check the two above proposals-Fuzzy-based and predictive-

You could try the latest generalized control approach introduced in 2013 - the multi-scale control scheme. It works for both SISO and MIMO systems, as well as for cascade and feedforward control environments.

hybrid systems, e.g., SMC+PID