Study of Compound Optimal Control for Beer Saccharification Temperature

The beer saccharification temperature process has great phase lag, and the technology for brewage needs its control track the set point curve fast without overshoot. The normal PID algorithm apparently can´t satisfy these demands. This paper presents a new method called compound optimal control-combined model predictive control (MPC) with bang-bang control. The simulation shows that the method not only has faster tracking speed, higher control accuracy and no overshoot compared with the normal PID control and dynamic matrix control only, but also has stronger suppressing capability of disturbance than PID control. Thus this system can satisfy the technical demands, and also shorten the saccharification time simultaneously. And it needn´t complicated process modeling, can be carried out simply, so it can be extended to other temperature rising processes easily.