An intelligent PID controller is designed to adjust ABR traffic rate on-line in ATM network for the congestion of high-speed communication networks with a Smith predictor introduced in to avoid the adverse effect of roundtrip propagation delay on control.

And the Smith predictor is presented to constrain the adverse effect on control caused by feedback delay.

Based on the ideal of Smith predictor, a decentralized decoupling and centralized control design method of predictive functional control(PFC) is proposed for two-input two-output(TITO) first-order plus dead-time process.

A numerical simulation was used to compare the ADRC with the reservedframe normalization method in the coupling loops and the SMITH predictive compensation method in the timedelay loop.

As to weak control quality of cascade control system which contains pure leg in its subloop, the control strategy of the combination of cascade control system and Smith estimation control system is stated.

A seam tracking system was designed,the sensor part and the real welding part were independent,that expanded it s use scope,Smith predicator was used to elimin.

Adaptive Smith compensator for NCSs over IP networks;

The paper introduces regulating principle of digital Smith compensator,realizes Smith compensationthrough SLPC digital regulator and introduces the application of digital regulator in temperature controlling sys-tem.

The Smith compensator controller corrected by a varied dead zone s asymmetrical nonlinear method, is studied and used in the simulation of the process control of indirect steaming, the results shows that the system which controlled by a corrected Smith compensator controller has good robustness of stability while the process and it s modal is not matched.