PH-97-04-4 -- Implementation of a New Pattern Recognition Adaptive Controller Developed Through Optimization ✓ Most Recent

Optimisation methods were used to develop a novel pattern recognition adaptive controller (PRAC) that automatically adjusts the gain and integral time of proportional-integral controllers while under closed-loop control. PRAC will improve the performance of PI control systems that are exhibiting either oscillatory or sluggish behaviour. The new controller is easy to use and provides near-optimal performance for a range of systems and noise levels. The algorithm is computationally efficient and does not have large memory requirements. Thus, the algorithm can be implemented in today's digital control systems for heating, ventilating, and air conditioning (HVAC) equipment. PRAC has successfully tuned control systems for HVAC equipment in office buildings, high schools, universities, national laboratories, department stores, hospitals, clinics, and large sports stadiums. Describes methods for implementing the new PRAC. Presents simulation and field test results.

KEYWORDS: year 1997, Algorithms, heating, ventilation, air conditioning, building services, controls, automatic, optimisation, performance, computer controls