During the procedure of making a feasibility research report for light rail of a certain city in the south region, by making comparison between several existing and recently built subway in China, the important reasons for selecting different environment control systems are analyzed.

And then the requirements of the air-conditioning and ventilation systems of the environmental control are discussed.

The subway transportation elevates year by year,the train number and speed is gradually improved, the energy of the environmental control system of subway therefore increases year by year.

This paper analyzes the theory, the structure and the function of environment control system for drug-plant.

Construction design and experimental study of close loop controlled booster frictional drive;

The development of carrier aircraft capsulting system is introduced in this paper,also with the systemtatic research on electromagnetic ejection system based on the basic principle of electromagnetic launch,the close loop control structure is designed for the system with the control effect increased through smart control.

When close loop control being carried through Air Fuel Ratio of gas engine, it also should be used in the gasoline vapors recovery system, which magnet valves work as intermittent operation, so as to determine the effect of carbon canister clearing airflow on Air Fuel Ratio, and control the quantity of airflow.

Research on closed-loop control system based on windows software for friction welding;

Closed-loop Control Technique of Precision Injection Molding Machine;

Application of stepping motor closed-loop control to speed-regulating system of extruder;

Analysis on circulating control characteristic of open to air check valve for high pressure feed-water system;