Fundamental of Model-Based Diagnosis

Faults in Hybrid Systems: Motor Example

Fault hypotheses

(discrete faults) x (continuous faults) x (autonomous transition faults)

Motor off

Steady state

Ramp up

Ramp down

Motor does not energize

Motor on

Motor off

Motor fault

y=motor speed

Kpi=nominal acceleration

Kh=steady state speed

Kpo

Kpi

Time


	•Modeling abrupt failure and gradual degradation
	•Enable automatic generation of fault symptom table, which is in turn automatically compiled into a decision tree diagnoser.