Design And Implementation Of An Expert Management System For Automobile Fault Detection And Diagnosis

This project deals with the design and implementation of an expert system for car faults diagnosis. The project is motivated by the need to guide car owners and learners motor mechanics in the maintenance and trouble shooting of motor problems without having to resort to presumptions and conjectures. Particularly, it is expected that the proposed design would ensure that car owners have proper assistance in times of crisis and what’s more will save them from the clutches of exploitative roadside mechanics. For this purpose a rule- base artificial intelligence (AI) technique was utilized to obtain theoretical and practical expert system parameters, and then a conceptual expert system was designed. The expert system functioning is based on the database of car faults, symptoms and their correction, which make up its knowledge base. The new system was developed using visual basic 6.0 programming language and access database. This language was chosen because of its easy syntax and features for developing windows based application.

 

Title page          i                                                                               

Approval page         ii

Dedication         iii

Acknowledgement        iv

Abstract          v

Table of contents        vi

CHAPTER ONE 

1.0 Introduction    1

1.1 Background of the study      1

1.2 Problem statement       2 

1.3 Objectives         3

1.4 Significance of the study      4

1.5 Scope of the study       5

1.6 Limitations         5 

1.7 Methodology        5

CHAPTER TWO

2.1  Literature review       7

2.2 The Conceptual Structure of an Expert System 14

2.2.1  Problem Assessment      14

2.2.2  Knowledge Acquisition      15

2.2.3  Knowledge Representation     17

2.2.4  Verification        18

2.2.5  Validation         18

2.3 Testing Expert System       19

2.4 MYCIN         21

CHAPTER THREE

System analysis and design      27

3.0 Introduction        26

3.1 Weakness of the Present System    28

3.2  Methodology        28

3.3 Knowledge acquisition      28

3.3.1 Domain Expert       29

3.3.2 Interview        29

3.3.3 Consultation        29

3.3.4 Diagnosis        32

3.3.5 Correction/ explanation       32

3.4  System Design        33

3.4.1 Rule based development method    34

3.4.2 Inference technique      36

3.4.3 Flowchart of the proposed program    38

3.5  Program design       39

3.5.1 High level model of the proposed system  40 

CHAPTER FOUR

4.0 System implementation      41

4.1  Introduction        41

4.2  System requirement       42

4.3  Testing         42

4.4  Maintenance         43

4.5  Program Documentation      44

4.5.1 Sample input/output data formats    45

4.5.2 Loading the package      46

4.5.3 Exiting         47

CHAPTER FIVE

5.0 Summary, Recommendation and conclusion  48

5.1  Summary         48

5.2  Recommendation       49

5.3  Conclusion        49

References        66

Appendix I         75

Appendix II        58

In present time most households own at least one car. This figure shows that a car is very important to people’s lives as it completes the cycle of living.

This computer expert system is hoped to help those who are in need of guides to deal with their cars problems. Although it might not give a complete guide and help as a human expert,   namely mechanics, at least the expert system can give temporary assistance to those who are in need of instant help, as a result of the limitation of time and distance. 

With the help of a car, movement from one place to another has been made easy especially for those who are always mobile in their jobs. Cars simplify our lives and make time to be more valuable as we can save more time using the car. But at the same time, people who own cars definitely don’t want to have a problem with their cars as the troubleshooting of a car can be a nightmare to them, especially women. Some of those own a car individually don’t know how to deal with their cars whenever it has a problem. All they know is to start the engine, drag the clutch if it is not automatic, press the paddy and break when they need to. An even the worse situation is that they don’t even know how to fill the fuel tank, and that is not good. They won’t know what to do when something happens to their cars. All they can do at best is, call the mechanic for help.

So, this computer expert system is hoped to help those who are in need of guides to deal with their cars problems. Although it might not give a complete guide and help as a human expert, namely mechanics, at least the expert system can give temporary assistance to those who are in need of instant help, as a result of the limitation of time and distance. 

 In dealing with problems of a car and troubleshooting, mechanics are those who can help to solve them. The use of a computer expert system is beneficial in different ways. It gives a temporary and instant guide to car owners in different situations like: 

• When mechanic support is unavailable 

• When we are in a hurry 

• When distance to mechanics location is far 

• When mechanics diagnosis wrongly, etc.

 To develop an expert system on car maintenance and troubleshooting that is capable of assisting car owners in dealing with their cars problems and troubleshooting them whenever time is limited and the human experts, also known as mechanics is not available at that very time. The development of the system surely has some significance to humans especially those who own a car and to the system developer as well. Among others, the system will perform the following functions:

• It will conclude its diagnosis based on answers of the users to specific question posed by the system to the user.

• It provides facility in order to take the user opinion on the following: does the use agree with the system’s diagnosis? Does the user disagree with the system’s diagnosis?

• It provides explanation, picture, why and fact facility.

• It stores the facts and the conclusion of the inference of the system and the facts and the conclusion of the inference of the user, for each case in data base.

• It processes the data base in order to extract rules, which complete the knowledge base.