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The Study Of Lift Controller Fault Diagnosis Based On PETRI Nets

Posted on:2005-06-18Degree:MasterType:Thesis
Country:ChinaCandidate:Z LiuFull Text:PDF
GTID:2132360122981283Subject:Mechanical and electrical engineering
Abstract/Summary:PDF Full Text Request
Using Petri nets theory, this thesis carries out lift controller's normal running Petri net model and function running Petri net model. It is successful to use logic fault diagnosis Petri net model, which is brought forward by the thesis, into lift controller fault diagnosing. This thesis has done the following work:After studied the development of fault detection and diagnostic techniques in china and lift controller's running process, using time Petri net, this thesis carries out lift controller's normal running Petri net model and function running Petri net model. These models not only can be used in lift controller's fault detection, but also lay the foundation for lift controller's fault diagnosis.The modeling of logic fault diagnosis problem based on Petri net is the emphasis of the dissertation. Due to the shortage of Petri net in fault diagnosis, this thesis brings forward logic fault diagnosis Petri net model. This model was used into the lift fault diagnosis and the multi-fault and conflict problems in lift controller's fault diagnosis were solved successfully.This thesis designed serial communication data exchange circuit board, which not only can transmit and collect 24V DC signals, but also can detect the fault of itself with the fault diagnosis software in the thesis. Lift controller's fault diagnosis system's cost is largely reduced by using the board, which was replaced the parallel communication board.Lift controller's fault diagnosis software was carried out. Using the software and facing the friendly computer interface, tester can finish the ports test, normal running and function running test and fault diagnosis.
Keywords/Search Tags:lift controller, Petri net, logic fault diagnosis Petri net, data exchange circuit board
PDF Full Text Request
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