摘要： 符号定向图仅应用系统静态症状，诊断结果存在冗余。附带时序信息的TSDG 方法，在两类阈值5 级符号定向图的基础上，应用诊断对象的动态症状和历史信息，根据传播故障信息的一致路径，搜索真正的故障源。时序信息限定了故障诊断中的因果关系，消减了诊断的空间。TSDG 在带热交换和混合的管道系统中的应用，验证了诊断系统的正确性。

关键词: 时序；符号定向图；故障诊断；定性仿真

Abstract: There are a lot of redundancies in the diagnosis result for signed directed graphs use only static symptoms. TSDG method with temporal order, based on the graph of five-range qualitative signs, employs the diagnosis of dynamic symptoms and history information of object system. It can search the real fault source in the light of the consistent propagation path of the fault information. The system of SDG based on temporal order can simplify the diagnostic space because it restricts the cause-effect relationship of diagnosis. Using in diagnosing a ductwork with heater equipment, TSDG proves its validity

Key words: Temporal order; Signed directed graphs; Fault diagnosis; Qualitative simulation