Intelligent Building Control Systems And Control Algorithms Based On Lonwork Technology

Advanced building intelligent control system (BA system) of domestic and foreign provides safe, comfortable, convenient and high-effect living environment for residents. But the BA system just has a little of control techniques. It mainly adopts the simple PID algorithm whose PID parameter gets from the experience or fieldwork. All of these influence the application effect of BA system.The hardware and software knowledge of the LonWoks technology are introduced at first; Then choosing central authority air-conditioning system which is the subsystem of building intelligent control system as a representative style, DI, DO, AI and AO node are designed according to the request of control designing. And a dynamic integral partitioning PID control algorithm is applied to adjust the water valve temperature in air-conditioning system; Finally, the various PID parameter autotuning algorithm based on relay feedback are analyzed, and according to the big time delay characteristic of system, the algorithm of relay feedback is adopted, which puts the integral part behind the relay feedback part.Through using the dynamic integral separation algorithm, the conventional integral separation algorithm is improved, which enhances the control effect and simplifies the parameter autotuning work. By Comparing the MATLAB simulation results of relay feedback algorithms, the improved relay feedback algorithm has a good control effect.