A Rule Based Expert System For Vehicle Fault Diagnosis - Engineering Assignment Help

Assignment Task

A Rule Based Expert System for Vehicle Fault Diagnosis

ABSTRACT

Vehicle usage in these modern times can no longer be considered as a luxury but a necessity. Vehicles, like any other mechanical devices, can develop fault during usage and in some circumstances it is very difficult in getting the services of an auto mechanic based on the location at which the vehicle developed fault. This work is aimed at the design and implementation of a rule-based expert system for vehicle fault diagnosis. The work is motivated by the need to guide car owners and inexperienced auto mechanics in making informed decisions when trying to provide solutions to various mechanical faults applicable to their vehicle. Essential part of this work is knowledge-based aspect of expert system consisting of production rules derived from facts and knowledge obtained from expert auto-mechanics and specialized car websites. Java development kit, NetBeans IDE and MySQL were used in the development of this work due to their easy syntax and features for developing Graphical User Interface applications. The result of the work displays interactive pages thereby making it easier for the user to interact with the software.

1.0 Introduction

Vehicle is used by very high numbers of households in various parts of the world in the transportation of people and their respective goods from one location to another and performing different varieties of tasks has made it to be an important factor in our daily lives [1]. Like any other mechanical equipment, these vehicles can develop faults. When an automobile develops fault, the driver usually calls for the service of an auto-mechanic or be taken to a mechanical workshop depending on the severity of the situation. Nowadays, as car technology and specifications are changing rapidly, this issue serves as a difficult task to automobile mechanics and vehicle drivers in dealing with car malfunctioning [2].

The advent of modern technology poses a challenge to inexperience auto drivers and mechanics. Therefore, success rates of car failure diagnosis greatly lie on the expertise of the individual.

This reliance can be reduced if experts’ knowledge is captured and employed in developing a knowledge based system [3]. Expert system will assist car owners in troubleshooting vehicle faults at anywhere and any period of time in a rapid manner. As an important branch of Artificial Intelligence, the system can bring us great conveniences through collecting expert knowledge and using intelligent reasoning method to complete the fault diagnosis processes [3].

This work will assist drivers and inexperienced auto mechanics in speedy diagnosis of vehicular faults in addition to other benefits such as capturing the knowledge of skilled mechanical engineer who someday might retire or die after some years; using the expert system in the training of inexperienced auto-mechanical engineer and wide distribution of uncommon deposits of human knowledge devoid of human tiredness, fatigue and emotional disturbance [1].

2.0 Materials and Methodology

A review of relevant literatures was explored in a bid to obtain needed information for the analysis. Based on the goals of this work, a design based methodology was employed. The following steps were employed in the design: 

- Problem identification and analysis: the process of identifying the existing problem, analyze its deficiencies and describe how to improve on it.

- Review of the previous related research and suggested how the system can be design and implemented with an optimal solution.

- Design and implement the system based on the suggestions.

- Evaluate and experiments the part or completely successful implementation based on its functional specification.

- Document conclusion based on findings at design and evaluation phase

In the methodology, production rules were employed in the design. These production rules consist of 19 rules which will enable the development of a rich diagnostic system. The following represents the rules employed in the development of these rule-based expert system for vehicle fault diagnosis [4,5,6]:

Rule 1: IF nothing happens when an attempt is made at starting the car AND the headlight lights up when it is switched on, then the vehicle symptom is Dead Battery. Rule 2:IF the vehicle symptom is Dead Battery, THEN recommendation is Replace the Battery.

Rule 3:IF the vehicle cranks slowly when an attempt is made in starting and the headlight lights up when it is switched on AND the fuel tank is empty, THEN the vehicle has run out of gas.

Rule 4:IF the vehicle ran out of gas THEN refuel the vehicle.

Rule 5: IF the headlight displays light when switched on is true AND the vehicle cranks slowly when an attempt is made to start it AND the fuel tank is not empty AND the headlight dimming is true when starting THEN the battery is weak

Rule 6: IF the diagnosis is weak battery THEN recommendation is recharge the battery.

Rule 7: IF the headlights displays light when switched on AND the car cranks slowly when an attempt is made in starting the car AND the fuel tank is not empty AND the headlights dimming when trying to start the starter THEN the symptom cannot be identified.

Rule 8:IF the vehicle symptom cannot be identified THEN recheck again from the beginning.

Rule 9:IF the headlights displays light switched on AND the car cranks slowly when an attempt is made in starting the car AND the fuel tank empty is false AND the headlights dims occasionally when an attempt is made in trying the starter THEN the diagnosis is weak battery

Rule 10: IF the headlights displays when switched on AND the car cranks slowly when attempt is made in starting the car AND you are not so sure if the tank is empty THEN the diagnosis cannot be identified.

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