Abstract: Optimizing time control and fuzzy PID control are integrated to control the temperature of barrels of injection machines in real time. By using fuzzy reasoning rules，fuzzy tables for PID parameters were obtained，and the parameters of PID algorithm can be modified on line by looking up these tables，and this method has ability to resist the time-varying of system parameters. This program was simulated by Matlab simulation and tested in experiment. It showed that the fuzzy PID controller had good performance in dynamic state and high accuracy in temperature control. The deviation of temperature was±1. 5 ℃，which can be specification for control requirements.

Key words: temperature control, optimized time control, fuzzy PID control, Matlab simulation, Performance experiment