Fault Diagnosis Using T-invariance of Petri Net

J. Ocean Eng. Technol. 2001;15(4):101-107.

페트리네트의 T-invariance를 이용한 시스템의 고장진단

정석권,정영미,유삼상

부경대학교 기계공학부,부경대학교 대학원 메카트로닉스,한국해양대학교 기계·정보공학부

Keywords: Fault diagnosis, Petri Net(PN), T-invariance, Backward chaining, Inter-node search, Incidence matrix

핵심용어: 고장진단, 페트리네트, 트랜지션 불변성, 후방추론, 중간노드 검색, 접속행렬

Abstract

This paper describes a fault diagnosis method by a T-invariance of Petri Net (PN). First, a complicated fault system with some failure is modeled into a PN graphic expressions. Next, the PN model is analyzed by using the backward chaining of T-invariance to find out causes of the faults. In this step, an inter-node search technique which is suggested in this paper is applied for reducing searching area in the fault system. Also, a novel idea to compose incidence matrices which have different dimension each other in PN model is proposed. As the new knowledges which is discovered newly about faults can be added easily to conventional systems, the diagnosis system will be very flexible. Finally, the proposed method is applied to the automobile fault diagnosis system to confirm the validity of the method.