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This paper introduces a saving-energy controlling method of water-circling pump. It is a method that traditional PID control combined temperature fuzzy-PID and PWM. The enactment in advance include that turn frequency, turn delay and the value of floor and upper limit difference in temperature pulse. The pump's running-frequency is adjusted by saving-energy controlling tank through PID arithmetic bases on difference temperature between input pipe and output pipe. When it is the moment that the running-frequency under the turn-frequency and it is turn-delay, the method of PWM is adopted. When it is the moment that the running-frequency up the turn-frequency, it will be into the method of fuzzy-PID adjusting. It will be truth that heating temperature will be controlled through out-temperature because the application of PWM technology. This method will save energy of pump above 30 percent, as the user's requirement is met.

The problem about energy consumed by central air-condition is paid attention by people. There are great non-linearity, lag and variety of parameter in this system. Traditional PID control arithmetic has some difficulty. The merit of fussy-control is that there is better dynamic response characteristic. The mathematic model is not needed in this arithmetic. There is better adaptability, faster rise time and better robust characteristic. But there is error in fussy-control by limited grade. So we use AT89C58 as control kernel and use fussy-PID arithmetic in this system. It ensures that there is faster, more stability and smaller error. This control system has been proved stable by some experiment, the anti-interference ability is strong. It can satisfy completely the need of variable-flux equip.