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
K
pi
=nominal acceleration
K
h
=steady state speed
K
po
K
pi
K
h
Y
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.