Several Aspects Should Be Noted About Auto Fault
Traditional car fault diagnosis without any instrument
, equipment, vehicles, manual fault diagnosis method. We must not forget the launch x431, lexia3, mb star of use. The most commonly used in vehicle maintenance direct diagnostic methods, "see, hear, listen, ask, try," these methods in the domestic automotive maintenance experience is still relatively abundant. High vehicle maintenance equipment and testing equipment not yet fully in place, to the vehicle fault diagnosis very difficult, so as to cause miscarriage of justice, therefore, use of mature maintenance experience is essential.When the car failed to observe. Check on the dashboard or out the bright lights failure, can be judged is the electronic control system malfunction, or mechanical systems failures. Air flow lead dust drift, acceleration back to normal after washing. The conventional "five oil, 3 medium, a media" inspections can not be ignored, namely, turbine oil, engine oil, automatic transmission oil, power steering oil, gear oil, brake fluid, coolant, wiper fluid, and refrigerant cleaning Check. launch x431 is an important detection techniques. Most advanced car on the instrument light show all in English, such as wash fluid light is on, check the cleaning solution and storage in liquid level, you can remove the warning after adding lights. Brake fluid containers of liquid below the warning line, added after the complete brake fluid troubleshooting, how to solve simple. By the quality of liquid vehicle components to determine failure. Oil can be determined according to the color of automatic transmission failure is due to the fault, rather than lack of engine power, removed oil pan, check to prove it right. Check the line is just as important. In view of the process should be carefully read, taken seriously, combined with analysis to look at, rather than skim the surface, so as to achieve the multiplier effect.
Most commonly heard phrase is "a certain level of real high, sitting at the gate, the vehicle from the side after he knew where wrong." Although the exaggerated remark, which also shows the importance of maintenance liking. Listen, we must first understand the failure of the parts, to distinguish the type of sound, Moreover, the failure analysis is now up to the mechanical failure, so to say "listen to power" is the basic training maintenance personnel. If you find the exact fault location, maintenance will take many detours, waste of manpower, material and financial resources. If the engine failure, it can not be ruled is automatic transmission fault. Shanghai Passat sedan as a hot car a slight noise, as the car carrying the automatic transmission, no clutch pedal to use the method to determine the fault location. After auscultation, and finally found dismantling the 6-cylinder connecting rod bearing clearance is too large causing engine knock.
Car is a complex mechanical system, which consists of thousands of parts that constitute the engine is the car's power source, is the heart of the car, the car some of the basic technical performance are directly or indirectly associated with the engine performance is linked. It produced the highest proportion of failures of the entire car (in the whole car in about 19.8%), spare parts consumption per unit distance (in the whole car in about 75.6%), warranty hours consumption (in the whole car is about: 1124.0%) also accounted for the first automobile engine, the engine fault diagnosis and maintenance of the level of the most important in the automotive repair, so the general performance of the engine testing on the reported vehicle performance is essential. It should also be noted lexia3 use. Engines are generally used reciprocating internal combustion engine, gasoline engine commonly used (the gasoline) and diesel engine (diesel engine), its complex structure, poor working conditions, long-term use of the process in a variety of environments, subjected to various stress , such as external environmental stress, internal stress and exercise stress function and assembly, components such as the structure and terms of use, such as roads, climate, use of strength, driving conditions, etc. _I two different technical conditions of the engine parameters, will be different changes in laws and different intensity, or degradation of performance parameters, will ultimately lead to failure. Engine is an engine part or total incapacity of the phenomenon manifests itself in sound abnormal, fluid leakage, overheating, power down, excessive fuel consumption, condition mutation, abnormal appearance, body vibration.
Traditional fault diagnosis expert system (Expert System, referred to as ES)) is the intelligent diagnosis based on symbolic reasoning model, is in the field of fault diagnosis to the level of human experts to solve difficult problems in the field of computer program. Their general knowledge-source, inference engine and the human interface components. Uncertainty in the system can not complete under the reasoning of domain knowledge, but also to explain the problem solving process. It is also hard of knowledge acquisition, knowledge level and weak narrow and limited reasoning ability.
Engine fault diagnosis technology is in the car without disassembly or complete disintegration of the premise, relying on advanced sensor technology and detection technology, acquisition engine with some of the characteristics of various dynamic information, and information analysis and processing of various to distinguish, identify and confirm the abnormal findings to predict its development trend, to identify its causes generated, location and the severe degree, propose targeted measures and Chu Li Wei Xiu methods, Bing offers impartial, scientific data. Frequently used tools are mb star. The main driving force of the car, economy, security, reliability, noise, pollution and other conditions tested. With the increasingly widespread use of cars, keep the amount of rapid growth, its structure and technological advances in detection and diagnosis techniques to make cars more to change the original detection method for the detection of new diagnostic techniques and methods to ensure the vehicles run in the safety, energy conservation, reducing vehicle emissions and noise Lu, reduce the use, maintenance costs, to extend the economic life.
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