Time-constrained diagnosis using hierarchical models

An architecture, Tilde (time-limited diagnostic environment) has been developed specifically to investigate time-constrained hierarchical diagnosis. Diagnosis is first performed at the most abstract level and is progressively deepened as time allows. Thus Tilde's objective is to find the most 'profitable' search route through a hierarchical candidate space within a given deadline, the system has been implemented with an existing model based diagnostic tool (ODS-PI). To this has been added a supervisor which directs the hierarchical search, and reviews deadlines. The current implementation has been tested on a two level model of a crude oil distillation plant.<
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