It puts forward welded seam automatic tracking system based on DSP vision sensor and presents the system main hardware block and software design briefly.

The paper then shows hardware and software block diagrams of the automatic fluid filling system with related merits and requirements which are the basis for the practical design.

In this paper an improved solution based on computerized interlocking is proposed against the traditional re-lay-interlocking-model automatic block system in railway signalling in our country.