Expert System Diagnoses Damage to Injection Motorcycles with the Certainty Factor Method

- Motorcycles are the main means of transportation that is widely used to support the activities of their societies. Prior to the development of technology, motorcycles still use carburetors. But motorcycles are still using carburetor system is still quite wasteful. With the development of technology, there is now applying the Yamaha brand motorcycles capable of supplying petrol injection engine needs. Motorcycles injection technology is much more efficient compared to motorcycle carburetor technology, in addition to economical motorcycle of this type has a performance engine and a reliable power. But frequent obstacles that cause damage to the injection Yamaha motorcycle, disrupting users.An expert system is a system that adopts the expertise of an expert an expert in a particular field into the system or a computer program is presented with a display that can be used by a user who is not an expert so that system users can make a decision or set policy like an expert in finishing problem. Certainty factor method used to obtain the value of the certainty of damage from an expert motorcycle injection, so that the user also gets the value of the damage certainty selected symptoms of the experience of experts. The results of diagnostics in expert system that has been made that if the user mencheklis symptoms such as clogged when rotated gas engine, electric distater difficult / lift, lights up when the engine is difficult to use the kick starter, often emit exhaust sound of an explosion, it can be concluded from the analysis that the damage found on the spark plug with a value of MB = 0.99, MD = 0:22 and Certainty Factor value of 76.66%. The diagnosis ever made by a visitor or mechanical accessible again by entering an email to the database.


Introduction
In an era of fast-paced, many people started looking for ways that can support their activities. Not hanyasmartphone and laptopsaja, but also the vehicle. Today most of the people prefer motorcycles as the main means of transportation compared to other vehicles such as private cars or public transport, as well as being effective and more efficient, [1] Prior to the development of technology, motorcycles still use carburetors, which is a device that mixes air and fuel for an internal combustion engine. But motorcycles are still using carburetor system is still quite wasteful. With the development of technology, there is now applying the Yamaha brand motorcycles capable of supplying petrol injection engine needs. You do this by spraying the fuel that has been measured: by sensors in it that makes motorcycle injection technology is much more efficient compared to motorcycle carburetor technology, in addition to economical motorcycle of this type has a performance engine and a reliable power. [2] But frequent obstacles that cause damage to the injection Yamaha motorcycle, disrupting users. There are still many users do not know the Yamaha motorcycle constraints Yamaha motorcycle damage to the injection-system. The problem for users of Yamaha motorcycles applying the injection can be fatal if not repaired the damage type. In general, users will tend to leave at a mechanical workshop. The level of mechanical difficulties experienced in knowing or determining the type of damage to the brand Yamaha motorcycle injection has prompted researchers to use information technology through a method that combines the expertise and knowledge of an expert to devise a system to solve the problem. Expert systems try to find a satisfactory solution as did an expert. [3] certainty Factoris a measure of certainty to a fact or rule. Certainty Factor provides a draft Measure of Believe (MB) is the belief hypothesis is affected by symptoms and Measure of Disbelieve (MD) is the lack of hypotheses that are affected by the symptoms. This method was chosen because it can display the value of the percentage of confidence in the fact that identified, but it is also this method in a two count only be able to process the data only so that its accuracy is maintained. [4] An expert system is a system that adopts the expertise of an expert an expert in a particular field into the system or a computer program is presented with a display that can be used by a user who is not an expert sehinnga with the system user can make a decision or set policy like an expert in finishing problem. [5] a

. Expert System Components
Expert systems generally have three elements: knowledge base (Knowledge Base), Inference Engine (Inference Engine), and User Interface (UI). [6] 2.2 certainty Factor certainty factor(CF) is a clinical parameter values yangdiberikanMYCIN to show how much confidence. In the face of a problem often found answers that do not have full certainty. Uncertainty of bias in the form of probability or dependent on the outcome of an event. [7] a. Advantages and Disadvantages MetodeCertainty Factor.
Excess certainty factor method is: a) This method is suitable for use in an expert system that contains uncertainties. b) In one calculation process can only handle 2 data only so that the accuracy of the data can be maintained. While the lack of certainty factor method is: a) Modeling uncertainty using certainty factor calculation method is usually still debated. b) For more than two pieces of data, should be done several times a data processing. : Events / facts (evidence). In one case there will be more than one size of the increase in trust in accordance with many of the symptoms that are owned by hypothesis, so the formula MB and MD as follows:

Research methods
This method describes what methods will be used in the study, it is the method of Certanty Factor. certainty factor a calculation degree of certainty to the conclusions obtained were calculated based on the probability.To assist in the preparation of this study, the need for the composition of the framework (Frame Work) is clear in its phases. This framework is the steps that will be done to solve the problem to be discussed.
Here is a framework of research:

Data analysis
The data analysis is the effort or how to process data into information so that the characteristics of the data can be understood and useful for solutions to problems will be resolved, especially issues related to research. The success of an expert system lies in how to cultivate the knowledge derived from data processing to be drawn to a conclusion. Data on the knowledge gained from the research conducted on a motorcycle mechanic injection particularly for Yamaha in the garage Yamaha. From the results of research that has been done, the data obtained from Yamaha motorcycle shop such as the following: Engineering difficult light up when using the kick starter. KG04 The road feels stilted. KG05 Often emit exhaust sound of an explosion. KG06 Total dead engine. KG07 Wasteful fuel consumption.

KG08
In the state of the roads was accompanied popping sounds of screeching skid. KG09 A voice came from inside the box CVT friction when the road. KG10 When the engine suddenly died. KG11 Roads clogged when speeds above 50 km. KG12 Crackling sound when the road inside the box CVT. KG13 The machine is turned difficult. KG14 Less than the maximum traction motors.

KG15
When the handle is opened happen buffeting gas coarse / motorcycle jumping.

KG16
Sound rough when the road slowly. KG17 A decrease in engine performance. KG18 Exit pungent smell of smoke from the exhaust. KG19 When exit mengebul dense smoke. KG20 Acceleration lap top as restrained.

KG21
Engine running at idle is not stable. KG22 Exit thick white smoke from the exhaust.

KG23
There was the sound of scraping on the machine. KG24 The engine is very hot. KG25 Rough engine sound. KG26 Engine oil quickly reduced. KG27 Engine oil seeps.

Case study
A motorcycle owners want to know the damage that occurs in its motorcycle injection. Motorcycle experience symptoms such asThe road feels sluggish at best, wasteful fuel consumption, When the engine suddenly died, turned hard Machines, currently unstable engine running idle, engine oil quickly reduced. Here is the calculation of the damage diagnosis manual injection Yamaha motorcycle using Certainty Factor. [KG04] The road feels stilted.

Conclusion
From the analysis, design, and implementation of this expert system making it obtained the following conclusions: a. Expert systems using certainty factor method can be used as a guideline for the mechanic if you want to carry out repairs to the damage. b. With the expert system can enable customers to increase knowledge and understanding of the various types of damage, the symptoms of damage and handling damage to the motorcycle injection. c. The creation of an expert system application to detect damage to the motorcycle injection with Certainty Factor method is beneficial for mechanical because it can simplify and shorten the time to repair the damage. d. The diagnosis had done olehpengunjung or mechanic can be accessed again by entering an email stored in the database.