In switch process of varying duty

it is difficult to determine the switching point and the switching criterion is imperfect. Utilizing the "full-voltage

zero-braking

static-regulation" control strategy

a "predictive Petri-net" is proposed in the paper. A predictor is used in the Petri-net which provides judgment elements for the transition of Petri-net. Based on the idea of "prediction-decision-prediction-decision"

the judgment condition for switching process is added in this paper

and the self-optimization process of the Petri-net is realized. The temperature near the switching point is more stable. The test results on the laboratory furnace device show that when the switching point is uncertain

the predictive Petri-net can find the optimal switching point online and improve the response speed and stability of the system.