| With the development of automobile industry, the automobile population increases continuously in our country, in the wake of the swift increase of motor vehicle tenure amount, the vehicle traffic safety and environmental protection has become the great problem that people fully concerned.The motor vehicle security performance examination is the significant substance that the communication and transportation departments all levels the vehicle administration. The motor vehicle examination is referring to motor vehicle technique state either the work capability check .The vehicle goes through and over a long period of time employs, and such technique state changes into bad one by one, and has depressed the economy and changes into bad , driving force drops. If testing orderly automobile technical status in term of a certainty of period, taking relevant maintain measure, will prolong the life-span of automobile, improve the technical performance of automobile, perfect safety mechanism , have significant sense in preventing traffic accident , decreasing pollution of the environment, protects the people life and property security, enhancing the health of the people.The motor vehicle examination is an immense and complex mechanical and electrical integration system , and frequently can not cease that the engine shifts mending in the examination process , and the system is once broken down but be able to arouse the examination data alteration but causing it loses accuracy and notarization. So the system requiring systematically having the high dependability , in case the system go wrong that will arose the changing of inspection data , and lose veracity and notarization. As a result , the system needs the supernal reliability , on condition that the system going wrong must get right in a short time.The motor vehicle system daily will admit hundred buss carrying on the secure examination, permit moreover five trucks to be living the detection line at the same time, equally each truck the whole line examination time act as three to four minute. Examination string that such high velocity turns round , Whatever platform is broken down by the location. At the present time , the chiefly problem about the inspection system in our country is reliability that is low, moreover, no matter in theory or in fact there are many questions to resolve immediately to the fault diagnosis system for the inspection system . So proposing the motor vehicle therefore the original is aimed at this problem examines that string block is diagnosed together with the recovering scheme, the diagnosis expert system therefore establishing, the installation carries on the inline diagnosis to the examination , therefore moreover to the block carries on the online diagnosing, the loss that creates reduces up the minimal in an attempt to obstructing because of affairs , at the same time, therefore also is diagnosing research going a step further to the block against the recovering means.In this paper, main discussion content is to obstructs the intellect diagnosis system by the expert system means together with diagnose technique. The diagnosis system is a new high efficiency system of anthology machine, electron, computer. Its produce still may extensively use to spaceflight, electric power, mining industry, metallurgy, in the professions such as chemical industry and so on, especially being fit for high turning round, large complex control system, it may be enhance the dependability and effectiveness of the control system , cut down the installation maintenance expense. It shall be living in the national economy displaying the more and more significant action and bring tremendous economic results.The most splendid reliability analysis means is adjust to analyses the test installation and completely designed in the paper, the establishment that causes the diagnosis system not only maintain well-developed quality of such technique, but also lift design quality, Besides, based on Windows' s operating system, the diagnosis system developed by the way of Visual C++ have very good intelligent quality .causing installation defend staff be able to find the faults quickly and resolve it, lift the maintenance effectiveness. The application of expert system lifted that system contest force, conquered the substantial base in the interest of leading position in the domestic, the one hand method that decrease block ( either enhances the dependability ) is to lift the quality of examination installation, the other hand is to monitored continuously the installation running state, tendency is developed . The recognition of reason is the key fault diagnosis , by the means of the supervision , the installation operation parameter is collected online, analysis the relationship between the symptom and the fault, is base work that supply the data for the diagnosis knowledge base. It is very difficult to establish accurately a mathematical model for the system, therefore establish the fault process model of system device based on the fault tree, this figured means is clearly comprehensible, have people being clear at a glance about depicted logical relation between the event , moreover be convenient to adjust qualitatively and quantitatively analyses for among the complex logic events . At the same time, established the base of the diagnosis scheme. Besides, the diagnosis system is common to the fault looking for the other important electric circuit device, being able to establish the correct fault trees, it may diagnoses exactly . The production regulation has the feature of concision and ascertainment, particularly it accords with the subjective feeling of man .With the concept to the target to analyses, regarded the regulations as one type of target , have them to have unitary type.The inference engine passes the supervision of device condition, calls the regulation, carries on the fault tree on the basis of the specified search strategy, gets conclusions, and studies the diagnosis results.It is fully complex to the form of device of the observing and controlling system, be difficult to show in the way of simple mathematical model, need the experience of specialist to resolve, but it is the expert system special skill that show and handle this kind of enlightened knowledge, aiming at these features of the inspection system, by means of analysising fault , uniting domain expert' s knowledge, established the fault diagnosis expert system based on the production regulation , collecting information through the database that requires to diagnoses fault, adopting the means to the target, by means of forward-reasoning mechanism, diagnosing online together with recovering is achieved.At the moment the expert system design have possessed many theories and method, through using angle, design the expert system by means of employing program language Visual C++, unite organically together the target, the database technique and infer engine, establish the fault diagnosis expert system based on the production regulation. In theory analysis , it can be able to meet demand completely. For capturing knowledge and establishing knowledge-base work is not once complete, the rightful knowledge- base organization and administration system is the base to improve diagnosis knowledge in the days to come. By means of continuously accumulating experience in the practice, continuously improve the existing knowledge framework, finally lift the intelligent level of diagnosis system. The expert system is a kind of message treatment system based on knowledge, analogous to the logical thinking of mankind; Since adopting the modularization composition, it is convenient to spread to the different diagnosis target . Using synthetically the now available fault diagnosis method, having it unite effectively to the expert system, manufacturing the automobile inspection system with high efficiency and the self-improve capacity , it is a good direction for actual use in the future.
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