Auto Fault And Diagnostic Strategies
Along with social progress, more and more people using cars
, car diagnosis becomes critical, we must know something about the basics of automotive diagnostics.A car by the engine, transmission, running gear, steering, braking system, and electrical system, etc., and these subsystems can be further divided into assembly, organization, or device.launch x431, lexia3, mb star diagnosis of these types of instruments are very good.For example, the engine is the connecting rod, valve train, fuel supply system, cooling system, lubrication system, starting system, exhaust purification devices, and electrical and electronic control devices etc., which in turn, a series of mechanical parts or composed of electronic components. The composition of automobile parts or components are the basic elements of the system, the different links between them form a systematic combination of different functions. The ultimate goal of automotive diagnosis is to determine the status of parts or components to find out the fault location.As the vehicle structure and principles become more complex, more difficult to make fault diagnosis. In the vehicle structure and principle of simple times, hands alone touch, sight, hearing, and practical experience in fault diagnosis can be carried out, and now must use the appropriate methods and information technology support to complete the troubleshooting work. Diagnostic device for a launch x431.According to fault or failure mode and failure phenomenon of the causes and the mapping relationship between parts of the fault diagnosis. Diagnostic process is a phenomenon observed, signs of extraction, classification and causes of status or position to determine such phases. After observation of the failure phenomenon, first proposed the initial failure mode assumption, then there is targeted for feature extraction, and then test whether the feature parameters according to assume the failure mode, and finally identify the problem area. To observe their own car, pay attention to timely diagnosis and repair.
Change of state of automotive technology, processes and the mechanism of fault is a prerequisite for vehicle diagnostics. Cars can be seen by a large number of subsystems of complex system. Application of system theory can be extended to the automotive, assembly or component failure depth understanding of the nature and complexity of the fault level of awareness. Used car auto diagnostic process is an important component, primarily to determine the state of technology in the car is normal, the reasons for the failure to find anomalies and location. Car only in normal circumstances the state of technology can be reliable operation and maximize its performance and ensure safety during the driving, economy and exhaust emission. Car through visual inspection of the external conditions to determine their status, but without the disintegration of the case, determine its internal situation is very complex. If the vehicle assembly or institution through the decomposition of the mode of inspection, not only time-consuming and labor, but also its reliability and performance may be adversely affected. Citroen used in diagnostic techniques include lexia3. Therefore, the use of automotive diagnostic technology to form automotive technology to monitor, inspect and judge the quality of vehicle maintenance vehicle breakdown, is very effective.
Automotive functions that the system functions, it is determined by the subsystem functions. But the function of the system and structure of the system logic in the composition of the relationship may be different. Should know that the technologies of launch x431, lexia3, mb star.For example, the structure is a series of system functions may be parallel. The structure and function in the conversion of logical relations, in fault diagnosis should be given special attention, because of its failure to rule out the existence of hidden dangers. Car fault or system failure, which produce the same would also be appropriate subsystem failure. And the composition of the logic from the system point of view, the logic structure of the system at the system level consistent with the function of the system, and in the component level may be inconsistent, and the state space in the system failure events are mutually exclusive events and functions, they are from different angles of the system.
Functional characterization of the system state, system state changes in the performance of the system's failure signs, signs of trouble then and structure-related causes, when the system is normal, no fault structure, function properly, the system is in equilibrium; by using the process interference in the external conditions, the system may be unbalanced fault condition; we can also use this mb star diagnosis. If the means to repair it back to the original may be the normal state of equilibrium, or do not take maintenance measures, it is possible to balance the development of failure. Fault diagnosis of vehicle systems, that is, an imbalance in the system state is the cause of the malfunction or unknown circumstances, failure to identify the site. Found that failure through the monitoring function, and then determine the fault location by the structure analysis to determine the function to further confirm the failure. Fault diagnosis process is actually repeated this cycle. The reasoning process is functional - Fault - structure - function, while the verification process is a function - structure - failure - functions.
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