179 lines
3.0 KiB
Plaintext
179 lines
3.0 KiB
Plaintext
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:- object(fault,
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imports(proto_hierarchy)).
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:- info([
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author is 'Paulo Moura',
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version is 1.0,
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date is 2000/4/22,
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comment is 'Expert system for automobile fault diagnosis.',
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source is 'Example adopted from the LPA Prolog++ documentation.']).
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:- public(findall/0).
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:- mode(findall, one).
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:- private(told_by_user_/2).
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:- dynamic(told_by_user_/2).
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:- mode(told_by_user_(?nonvar, ?nonvar), zero_or_more).
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:- public(find/1).
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:- mode(find(?nonvar), zero_or_more).
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:- private(exhibited/1).
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:- mode(exhibited(+nonvar), zero_or_one).
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:- public(contrary/2).
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:- mode(contrary(?nonvar, ?nonvar), zero_or_more).
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:- public(fault/2).
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:- mode(fault(?nonvar, ?nonvar), zero_or_more).
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:- public(effect/2).
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:- mode(effect(?nonvar, ?nonvar), zero_or_more).
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:- public(symptom/2).
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:- mode(symptom(?nonvar, ?nonvar), zero_or_more).
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findall :-
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retractall(told_by_user_(_, _)),
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write('Please answer all questions with yes or no.'), nl, nl,
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forall(
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(::descendant(Where), Where::find(Description)),
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(nl, write('Location : '), write(Where), nl,
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write('Possible Fault: '), write(Description), nl)),
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nl, write('No (more) explanations found.').
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find(Description) :-
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::fault(Fault, Description),
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forall(::effect(Fault, Symptom), exhibited(Symptom)).
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exhibited(Symptom) :-
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told_by_user_(Symptom, Reply) ->
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Reply = yes
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;
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::symptom(Symptom, Description),
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write(Description), write('? '),
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read(Reply),
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asserta(told_by_user_(Symptom, Reply)),
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Reply = yes,
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forall(
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(::contrary(Symptom, Contrary); ::contrary(Contrary, Symptom)),
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asserta(told_by_user_(Contrary, no))).
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:- end_object.
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/* electrical sub-system:
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electrical
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lights
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starting
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sparking
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distributor
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plugs
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starter_motor
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*/
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:- object(electrical,
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extends(fault)).
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:- end_object.
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:- object(lights,
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extends(electrical)).
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:- end_object.
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:- object(starting,
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extends(electrical)).
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:- end_object.
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:- object(sparking,
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extends(starting)).
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:- end_object.
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:- object(distributor,
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extends(sparking)).
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fault(f1001, 'Condensation in the distributor cap').
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fault(f1002, 'Faulty distributor arm').
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fault(f1003, 'Worn distributor brushes').
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symptom(s1001, 'The starter turns but the engine doesnt fire').
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symptom(s1002, 'The engine has difficulty starting').
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symptom(s1003, 'The engine cuts out shortly after starting').
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symptom(s1004, 'The engine cuts out at speed').
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effect(f1001, s1001).
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effect(f1002, s1001).
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effect(f1002, s1004).
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effect(f1003, s1002).
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effect(f1003, s1003).
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contrary(s1002, s1001).
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contrary(s1003, s1001).
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:- end_object.
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:- object(plugs,
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extends(sparking)).
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:- end_object.
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:- object(starter_motor,
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extends(starting)).
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:- end_object.
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/* mechanical sub-system:
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mechanical
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engine
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cylinders
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*/
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:- object(mechanical,
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extends(fault)).
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:- end_object.
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:- object(engine,
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extends(mechanical)).
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:- end_object.
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:- object(cylinders,
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extends(engine)).
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:- end_object.
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/* fuel_system sub-system:
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fuel_system
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...
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*/
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:- object(fuel_system,
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extends(fault)).
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:- end_object.
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