To the question of networked control system with random time-delay in both forward and feedback channels, a new class of Smith predictor combined to Fuzzy PID control is presented. It sets up a new Smith forecast model and designs the parameter self-tuning fuzzy PID controller. The results of system simulation using MATLAB show that the network control system of the proposed scheme has better dynamic and stability, and in the case of model miss-matching has high robustness.

The remote control system based on DTMF transmission was discussed. It used a SCM (Single-chip microcomputer) and voice chip to realize remote communication control, which voice prompts can point out and feedback state information of the controlled side for different operations. Using this method, users in the outdoor can use any a DTMF phone including mobile, fixed telephone, according to the voice prompt, to carry out remote control of the switching and timing functions of the various home appliances. The system is practical, reliable, and can be widely used in household appliances or other places of various control devices. It will be the promising future technology products.

This artical designed and produced a half-bridge series resonant induction heating cooker induction cooker whose power is15kHz . The main controller of the cooker is S3F9454, and SG3525 is for adjusting the frequency, the principle of induction heating is the basis of its , by the load current feedback loop and PI we can get the adjustment of the frequency and power of the system. The practical use shows that the output power of the system is stable, and it has the advantages of high thermal efficiency and fast heating.