关键词: 定性仿真, 约束传递, 故障诊断, 制冷系统

Abstract:

Based on the QSIM algorithm of B. J. Kuipers, comparative constraint was presented to reduce the diagnosis space. The transfer regulation of qualitative constrain was used in the simulation and reasoning of system diagnosis. This algorithm took observed faulty state as the beginning, to diagnosis the location and cause of variable discrepancy according to the transfer regulation of qualitative constraint, reasoned from diagnosed faulty to examine the result and deleted the redundancy of diagnosis result. In the example of condensation refrigeration system, the constraint relation was built according to qualitative difference equation. Aim at the bad efficiency of refrigeration, the mixture of air or Freon superfluously was diagnosed as the result faulty source, consistent with the factual system.

Key words: qualitative simulation, constraint transfer, faulty diagnosis, refrigeration system