;
;*******************************
;** FINAL PROJECT             **
;**                           **
;** BY THAD FIEBICH           **
;** FOR CSCI 5931             **
;**     EXPERT SYSTEMS        **
;**     DR. GIARRATANO        **
;**     SPRING 1987           **
;**                           **
;*******************************
;
;
;
;        LOGIC OF THE PROGRAM
;     ____________________________
;
; The program is designed to diagnose a problem with a gas or electric
; stove and recommend the best way to fix the appliance. The problems
; and ways to fix the problem are as follows.
;
; First the program determines if the stove is electric or gas and if
; the problem is with the burners or the oven then
;
;		PROBLEM				
;
; no power to the stove	
;   	Check the fuse box and reset any blown fuses. If this does not work
;	call a professional
;
; ELECTRIC STOVE
; burner not working
;	Trade places with a good element. If the element still does not work
;	replace it. If the element now works then remove the element and
;	check the terminals for a blue tinge or a black coating or if the
;	ends are bent. All can mean that the terminal block unit is bad.
;	Check the unit for burn marks and if found replace. Else test the
;	burner switch and replace if bad. Else you have a bad wire and
;	you must trace the wire from the power to the switch to the
;	burner to find the problem.
;
; oven not working
;	Test the oven element to see if the element is bad and replace if
;	neccessary. Else check the switch and replace if bad. Else check
;	for a bad wire.
;
; GAS STOVE
; burner not working
;	Check the burner igniters and replace if bad. Else check the 
;	control switch and replace if bad. Else check the electrode
;	unit and replace if bad. Else call a professional.
;
; oven not working
;	Check the igniter for a glow. If none replace the igniter. Else
;	check and clean the orffice and replace. Check for any leaks
;	during reinstallation. Else call a professional.
; 
;
;********************************
;rule1:
;	initializes the program
;********************************
 
(defrule init
 (declare (salience 9980))
 ?x <- (initial-fact) =>
 (retract ?x)
 (assert (need professional n))
 (assert (start)))


;****************************
; rule2:
;	used to end the program and call the init rule to
;	reset the program
;****************************

(defrule end1
 (declare (salience 9200))
 ?w <- (stop)
 =>
 (retract ?w)
 (reset)
 (halt))
 




;****************************
;rule3:
;     	gives the opening message and asks what type of oven
;	you have
;****************************

(defrule begin
 (declare (salience -9000))
 ?x <- (start) =>
 (printout t crlf crlf crlf
	"The program is designed to help in repairing an electric or" crlf
	"gas stove.  The program will take you step by step through" crlf
	"the procedures to repair the appliance." crlf crlf
	"do you have a" crlf
        "  1) electric stove" crlf
	"  2) gas stove" crlf
        "  3) or exit the program" crlf 
	"Choose 1 - 3 -> ")
 (retract ?x)
 (assert (oven type =(read))))


;****************************
;rule4:
;	checks to see that a correct selection was made from
;	the opening message, if no redisplay message
;****************************
 
(defrule ck-select
 (declare (salience 9998))
 ?x <- (oven type ?ch&:(not (numberp ?ch)))
 (or (test (<= ?ch 0))
     (test (> ?ch 3))) =>
 (printout t crlf crlf
	"*** your selection must be either 1,2, or 3 ***" crlf)
 (retract ?x)
 (assert (start)))


;****************************
;rule5
;	asks if there is a burner problem
;****************************
 
(defrule burner-prob
 (declare (salience -500))
 (oven type ?) =>
 (printout t crlf crlf "Is there a problem with the burners? y or n ")
 (assert (burner problem =(read))))


;****************************
;rule6
;	asks if there is a oven problem
;****************************
 
(defrule oven-prob 
 (declare (salience -1000))
 (oven type ?) =>
 (printout t crlf crlf "Is there a problem with the oven? y or n ")
 (assert (oven problem =(read))))


;****************************
;rule7
;	ask if there is any power going to the stove
;****************************

(defrule ck-power
 (declare (salience 1500))
 (oven type 1) =>
 (printout t crlf crlf "Does the stove have any electrical power? y or n ")
 (assert (power =(read))))


;****************************
;rule8
;	tells the user to check the breaker for a blown fuse
;****************************

(defrule ck-breaker
 (declare (salience 100))
 ?x <- (power n) =>
 (printout t crlf crlf
	"Go to your home fuse box and check the circuit breaker for" crlf
	"the stove to see if it has been tripped.  If it has, reset it" crlf
	"and retry the stove." crlf crlf
	"Is the stove still without power? y or n ")
 (retract ?x)
 (assert (still no power =(read))))


;****************************
;rule9
;	checks to see if still no power even after breaker checked
;****************************

(defrule still-prob
 ?x <- (still no power y) =>
 (retract ?x)
 (assert (need professional y))
 (assert (stop)))


;****************************
;rule10
;	tells the user to let a professional handle the problem
;	due to danger
;****************************

(defrule get-help
 (declare (salience 9999))
 (need professional y) =>
 (printout t crlf crlf
	"This problem may be serious and would be best left to a " crlf
	"professional.  Tring to continue to repair the stove could" crlf
	"be dangerous." crlf crlf)
 (assert (stop)))

  
;****************************
;rule11
;	asks user what type of electric burner element type there is
;****************************

(defrule element-type
 (oven type 1)
 (burner problem y) =>
 (printout t crlf crlf "Is the burner element a " crlf crlf
		     " 1) push in/pull out type" crlf    
		     " 2) screw in type" crlf crlf
		     "Choice -> ")
 (assert (burner type =(read))))        


;****************************
;rule12
;	checks to see if a burner of the same size as the problem
;	element is working
;****************************
	 
(defrule any-elect-working
 (oven type 1)
 (burner problem y) =>
 (printout t crlf crlf
	"Is at least one burner of each size still working? y or n ")
 (assert (some work =(read))))


;***************************
;rule 13
;	rule to trade a working element with a nonworking to test
;***************************

(defrule element-trade
 ?x <- (some work y) =>
 (printout t crlf crlf
	"Remove the element that is not working properly and exchange" crlf
	"it with another burner element of the same size." crlf crlf
   	"***  be sure to cut the power before working ***" crlf crlf
	"Turn both element controls to high. Is the element that " crlf
	"was not working properly still not working? y or n ")
 (retract ?x)
 (assert (bad element =(read))))


;***************************
;rule14
;	determines the element is bad
;***************************

(defrule bad-element
 ?x <- (bad element y)
 =>
 (printout t crlf crlf
	"The burner element is bad.  You must replace the bad " crlf
	"element.  Afterward, check the burner and if there" crlf
	"is still a problem rerun this program." crlf)
 (retract ?x)
 (assert (stop)))

 
;***************************
;rule 15
;	tells user to use a ohmmeter to test element
;***************************

(defrule element-trade2
 ?x <- (some work n) =>
 (printout t crlf crlf
 	"Since you do not have another working element to interchange" crlf
	"with, you will have to test the element with a ohmmeter.  Cut" crlf
	"the power to the stove and remove the burner.  Place a probe" crlf
	"from the ohmmeter on each of the terminals of the element." crlf
	"Does the ohmmeter register 0 resistance? y or n ")
 (retract ?x)
 (assert (bad element =(read))))


;*****************************
;rule16
;	check for bent terminals
;*****************************

(defrule ck-element1
 (declare (salience -20))
 (burner problem y)
 (burner type 1) =>
 (printout t crlf crlf
	"Check the ends of the termnials." crlf
	"Do they appear bent? y or n ")
 (assert (terminals bent =(read))))


;***************************
;rule17
;	rule for if there is a bent terminal
;***************************

(defrule bent-terminals
 ?x <- (terminals bent y) =>
 (printout t crlf crlf
	"This shows that the element was installed improperly." crlf
	"This can cause terminal block failure." crlf)
 (retract ?x)
 (assert (check terminal block)))


;***************************
;rule18
;	checks if black coating on terminals
;***************************

(defrule ck-element2
 (declare (salience -10))
 (burner problem y)
 (burner type 1) =>
 (printout t crlf crlf
	"Check the ends of the terminals. Is there any sign of a black" crlf
	"coating on the terminals? y or n ")
 (assert (black coating =(read))))  
 

;****************************
;rule 19
;	rule for if black coating found on terminals
;****************************

(defrule black-coating
 ?x <- (black coating y)
 =>
 (printout t crlf crlf
 	"This is caused from a bad contact with the terminals to the" crlf
	"terminal block." crlf)
 (assert (check terminal block))
 (retract ?x))


;****************************
;rule20
;	rule to test if a blue tinge on terminals
;****************************

(defrule blue-tinge
 (declare (salience -10))
 (burner problem y)
 (burner type ?) =>
 (printout t crlf crlf
	"Check the ends of the terminals for any sign of a blue" crlf
	"tinge.  Does one exist? y or n ")
 (assert (blue tinge =(read))))


;****************************
;rule21
;	rule for if blue tinge found on terminals
;****************************

(defrule blue-tinge-exists
 ?x <- (blue tinge y) =>
 (printout t crlf crlf
 	"This is causd from grease being splattered onto the terminals" crlf
	"and then being heated to a high temperature.  This can cause " crlf
	"terminal block failure" crlf)
 (retract ?x)
 (assert (check terminal block)))
 

;****************************
;rule22
;	asks user to check the terminal block unit for burn marks
;****************************

(defrule ck-terminal-block
 ?x <- (check terminal block) =>
 (printout t crlf crlf
 	"Shine a light inside the terminal block." crlf
	"Do the contacts inside appear to be burned? y or n ")
 (retract ?x)
 (assert (burned contacts =(read))))


;****************************
;rule 23
;	rule for if burn marks found on terminal block unit
;****************************

(defrule burned-contacts
 ?x <- (burned contacts y)
 =>
 (printout t crlf crlf
 	"Replace the terminal block unit for the burner.  Afterward" crlf
	"sand the terminal ends with a fine sand paper or steel wool." crlf
	"Reinstall the unit and check the burner.  If there is still" crlf
	"a problem then rerun this program." crlf)
 (retract ?x)
 (assert (stop)))

;****************************
;rule24:
;	checks to see if there is any wear on the element
;	surface
;****************************

(defrule ck-element-for-wear
 (declare (salience -10))
 (oven type 1)
 (burner problem y) =>
 (printout t crlf crlf
	"Electric range elements use nichrome wires made of a nickle" crlf
	"and chromium alloy covered by a metal sheathing with a black" crlf
	"coating. Does the outside coating of the element appear to " crlf
	"have worn away at any point? y or n ")
 (assert (element worn =(read))))

;****************************
;rule25:
;	handles if the element is worn
;****************************

(defrule element-worn
 ?x <- (element worn y)
 =>
 (printout t crlf crlf
	"The nichrome wire has touched the sheathing and the wire has " crlf
	"burned out.  Replace the element.  Afterward recheck the " crlf
	"burner.  If there is still a problem rerun this program." crlf)
 (retract ?x)
 (assert (stop)))

;****************************
;rule26:
;	rule to check if any crimped wires
;****************************

(defrule ck-wires
 (declare (salience -100))
 (bad element n) =>
 (printout t crlf crlf
	"You must now lift up the top of the stove and check the wires" crlf
	"leading to the nonworking element." crlf
        "Do the wires appear crimped? y or n ")
 (assert (crimped wire =(read))))

;****************************
;rule27:
;	handles if there is a crimped wire
;****************************

(defrule crimped-wire
 ?x <- (crimped wire y)
 =>
 (printout t crlf crlf
	"First be sure the stove is unplugged.  Next strip the" crlf
        "insulation away from the crimped area and twist the loose" crlf
	"end together.  Solder the wire and cover the splice with" crlf
	"a ceramic nut." crlf
	"*** CAUTION - do not use a plastic nut as the high temperature" crlf
	"              will cause it to melt" crlf
	"Afterward, plug the stove in and recheck the element. If there" crlf
	"is still a problem rerun this program." crlf)
 (retract ?x)
 (assert (stop)))

;****************************
;rule27:
;	rule to handle if no crimped wire found
;****************************

(defrule no-crimped-area
 ?x <- (crimped wire n) =>
 (printout t crlf crlf
	"Unplug the stove.  Next, remove the screws from the control" crlf
	"panel and lean the panel forward.  You may have to remove " crlf
	"screws from the rear of the panel.  Label the wires leading" crlf
	"to the control switch of the nonworking element and those " crlf
	"of a working element of the same size.  Switch the wires of" crlf