| Summary: | 碩士 === 國立高雄第一科技大學 === 系統資訊與控制研究所 === 99 === Plastic injection products have been widely used, and their applications are still constantly expanding no matter in basic toys, in high-precision opto-discs, mobile /phone part, or in various medical supplies. The demand on the quality of plastic injection products becomes much higher and the dimension accuracy has been demanded in micrometer in stead of millimeter grade. There are many important factors that effect the quality and accuracy of the plastic injection products, and the performance of temperature control is one of them.
According to PIDC’s report, 1℃in temperature control error can make dimension difference for a plastic injection product with length of 1m, which is not acceptable.
Most of the temperature control used in industry adopted PID control method, but the control result is not so good in overshoot and steady state error. For better temperature control performance, a new control was proposed in this research, VSS-PID, which integrates VSS and PID. Using VSS-PID control, the temperature control performance, overshoot 1℃,steady state error± 0.2℃,heating time shorten 50％ has been shown in simulation and in real machine experimentation.
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