TEMPERATURE CONTROL SYSTEM BY FUZZY INFERRENCE

摘要

PURPOSE:To realize high-accuracy control characteristics which are smaller in the delay and overshoot of response in cooling control setting alteration than temperature control over a molding machine by PID control by applying fuzzy control. CONSTITUTION:An input information arithmetic part 21 calculates deviation and the quantity of variation of the deviation from a last value from a measured value of temperature and its set value. They are passed through condition judgment parts (22, 24... 32) for startup operation, retracting operation, a stationary area, set value variation time, disturbance detection time, and deviation correction, and respective fuzzy reasoning parts (23, 25... 33) for the startup operation, retracting operation, stationary area, set value variation time, disturbance detection time, and deviation correction calculate the grades of output rates; and then an output rate arithmetic part 34 converts the grades into physical quantities, and calculate and output the variation quantity of the output rates and a new control output to control a controlled system (heating and cooling device of the molding machine), thereby controlling the temperature of the molding machine.