This paper introduces the application of PLC in the control of getting a constant speed of the locomotive,which not only can reduce the cost,but also can make it sure that the locomotive work at a stable state.

After a mathematical model of saddle shaped curve being built up, a constant speed control for forming saddle shaped curve is presented to meet the requirement of uniformity of resultant feedrate.

The Development of Polishing Machine Admitting of Changing-direction Grinding with Constant Velocity;

Pump, air pump and so on generally is pulling by squirrel - cage motor, moving in constant velocity.

And according to the engine condition,the advanced fuzzy control technology has been adopted,the experience for engine steady speed control accumulated and a fuzzy controller made to control the engine running underr the steady speed.

Grid-connected Dynamic Simulation and Analysis on Wind Generation System of CSCF and VSCF;

The two main ways to generate electricity in the large and middle scale wind field are Constant Speed Constant Frequency (CSCF) asynchronous generator and Variable Speed Constant Frequency (VSCF) doubly-fed asynchronous generator.