Abstract Since the fumigation bed temperature control has the features of nonlinearity and large hysteresis， a precise temperature control system based on single chip microcomputer was designed to shorten the lag time and reduce overshoot， in which the authors adopted differential preceding PID calculating with Pulse Width Modulation(PWM) technology. The test results indicate that effect of differential preceding PID control is better than that of other normal PID control. This system has good control performance and dynamic performance， the control system is stable and reliable， and the detection circuit and the serial communication program both have good versatility and portability．
ZHAO Ai-Ling, ZHANG Hai-Feng, HOU Jun. Differential preceding PID controller based on single chip microcomputer for fumigation temperature control. Chinese Journal of Engineering Design, 2010, 17(5): 377-380.
