In the rolling procedure of cross wedge rolling,the technological parameters and instantaneous rotational speed ratio of workpiece and roller have intimate and complicated relationship.

A kind of detecting system used in vehicles about the instant volume of fuel is introduced,which is based on AT89S8252 single chip computer.

Aimed at the timing-control instantaneous comparison method with a problem of localized instability when it is used in three-phase active power filter,this paper presents an improved method based on double-direction compensation control strategy and analyzes its stability.