| Summary: | 碩士 === 國立虎尾科技大學 === 機械與機電工程研究所 === 97 === In this paper, the permanent magnet synchronous motor using fuzzy control technique in engine cooling system was studied. The engine cooling systems in a variety of types of vehicles use belt-driven fan mostly. Only cars and light goods vehicles use electric fan motors, but they are brush DC motors and use switch-mode control law; however, the fan output of two alternatives can not be adjusted with the cooling system at any time. The problem of excessively high current is also often one of the reasons that fans damage. Thus it increases the engine load, fuel consumption and the wear and tear of fan motor. Therefore, this paper replaces the traditional brush DC motors with permanent magnet synchronous motor for the engine cooling fan motors, and the water tank with water temperature is operated with intelligent fuzzy control theory. The program is inputted into C8051F330 by Silicon Laboritories companies Microcontroller MCU Development Tools. The output of the hardware builds simulation models.
The simulation results showed that the application of engine cooling system using fuzzy theory maintained the stability to keep the best rotation rate of the engine. The use of permanent magnet synchronous motor with the water temperature fuzzy logic responses fast. It keeps the best temperature of the engine as well as decreases unnecessary operation of fan, reduces the wear and tear on the fan motor and improve life of cooling fan. This study can enhance performance and reduce fuel consumption in practice.
Key Word：Permanent magnet;Brushless;Fuzzy
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