The Multiple Temperature Zones Control Research Of Automobile Air Conditioner

Along with the development of automobile industry and the microelectronic technology, the application of automobile air-conditioning becomes more and more common. Meanwhile, there are more and more requirements about the performance of automobile air-conditioning system. On the one hand, the fine technical performance and the control performance of automobile air-conditioning are required so as to meet comfort criterion of the passengers. On the other hand, as the energy consumption of automobile air-conditioning system increases day by day, the energy conservation of the automobile air-conditioning system appears importantly. The automatic control application is an important way to meet all these requirements.According to the air comfort criterion of the compartment, the main parameters which affected compartment air performance much were analyzed, and the multiple temperature zones control was proposed, the duct of multiple temperature zones air-conditioning was designed in concept.What's more,the PID control system and the fuzzy control system were established for the control of multiple temperature zones.With the aid of MATLAB/Simulink,the simulation experiments which took unwanted step leap signal and unwanted cyclical signal into account were carried on to evaluate the stability of the system. The experiments indicated that stable state precision of PID control system was excellence but robustness was poor.While the robustness of fuzzy control system was excellence but the stable state precision was poor,and its debugging was complex.Because fuzzy control system depended on the experience of operator very much,once the control rules were ensured,they could not be rewrited.On the purpose of improving the control effect,fuzzy control system based on self-adjusting rules which adopted subsection strategies ,and self-adjusting parameter fuzzy control system on the basic of former fuzzy control system were designed.Compared with the PID control system and former fuzzy control system,the holistic effect was obviously improved.Finally,a temperature measurement network testing system,Adopting 1-Wire Bus technology, was...