1 Introduction
With the continuous development of the national economy, energy, electricity, transport, telecommunications, environmental protection and other areas of modern requirements are increasing. As a VGP-BPS8 VGP-BPS8A battery backup power system are widely used for all does not turn off system power, the battery is a power systems needed backup. In addition, the battery system in various sectors more widely applied. Battery operating condition is normal, a direct impact on applications in a variety of equipment, normal, safe and reliable operation. In particular, the site unmanned center and e-commerce, bank back-up battery becomes particularly important.
After testing and optimizing the battery in a battery bank each monomer differences still exist between performance, these differences in the long process of the battery due to small differences in environment (such as temperature difference) in varying degrees to generate new ones. After a long-term performance of individual batteries have decreased significantly, seriously affect the performance of the battery, or may even cause accidents, and requires early diagnosis of worsening performance on a single cell and the early failure. In addition, degradation of individual cell performance and reduce the failure of the battery SOC (state of charge) value, because the poor performance of battery power only determines the state of battery charge. A battery is normally provided by a number of single cell or Dell GD761 Dell KD476 battery modules in series, the performance of the battery back in May only because of early termination of the discharge of the battery as a whole. And must therefore be equipped with battery failure diagnostic expert system. With the diagnostic system to achieve the battery failures and risks of early warning, so it may actually increase the battery pack electric car, driving range and smooth working hours to minimize maintenance expenses, thereby ensuring reliable operation of electric vehicles are capable.
Electric vehicles in whole or in part of the battery energy storage. Constrained the electric vehicle technology development and industrialization of electric vehicles as a major problem is the cell energy storage and application. Drums in the use of an important issue is the difference between different cells, there are inconsistencies, and early detection of inconsistencies and shortcomings of the battery has become crucial technical problems. Need to develop a battery system for early fault diagnosis. With the diagnosis system experts, we can make early diagnosis of unhealthy cells, but also for the model of the remaining capacity of the estimate can be more precise, this can prolong battery life and further reduce costs of the battery and increase the range of electric drive vehicle to improve the reliability of disks. The system and technological research has the theoretical value and the promotion of electric vehicles, industrial importance. Dell Studio 1537 battery Dell Studio 1555 battery
2 Diagnostic expert system for development of the status quo at home and abroad
According to the International Electrotechnical Society (CIS) in 1995, developed standards management system battery and vehicle electrical system battery management must have a battery of diagnostic functions, including cells of patients and provide early warning information on battery aging. During these 10 years, large foreign companies conduct a vigorous research studies, and in its operation using the management system of the battery by adding a certain amount of diagnostics of the battery. A company representative, and Mentzer Electronic GmbH in Germany, led by Werner Retzlaff designed BADICOaCH system; U. S. Aerovironmevt developed SmartGuard System (Long – Battery Life Using Smart Modular Control System).
(1) BADICOaCH System
BADICOaCH system BADICHEQ system improvements, it has a battery of diagnostic functions: a recent 24 cycles charge-discharge to store detailed data and allow judgments for and against the battery when the battery quickly find basic information and errors are used; hp Pavilion dv6 battery F3172A
(2) SmartGuard System
SmartGuard system has a battery of diagnostic functions related primarily to provide reverse polarity alarms and history to discharge the battery and archives.
Internal battery fault diagnosis also some research, as Chunlan Research Institute, Tsinghua University, but most of the research is still in its infancy.
In this paper, the study battery fault diagnosis is to find fault with the parameters of the cell performance of the stack to one or the relationship between N, a real-time monitoring, comparing the same battery various parameters between changes in cell and to consider other factors to make a complete diagnosis. After years of study, concluded with a pre-feasibility study of algorithms and experience in the electric car sports car for the diagnosis of the battery. His thinking is the same every single battery charge and discharge the battery at the same current, the majority representation in each single cell was similar, but there are some inconsistencies in the performance of the battery. With an integrated consideration of different cells during this time, the offset voltage and average PA3285U-1BRS PA3285U-2BRS battery voltage different during this period can be estimated by changing the battery performance is good or bad. Low voltage and single cell offset voltage variation is relatively small, good battery performance. Because there is no failure has been the performance of a battery charging voltage increase of discharge voltage slow fall slowly.
3 Error Diagnosis Expert System
3.1 System Expert
An expert system is a system of procedures for a variety of skills. It can provide knowledge in a particular motivation to simulate the human expert in a field of decision-making process of resolution of individuals who need experts to solve complex problems.
Mainly by the basic system of expert knowledge, inference engine, workspace storage, access to knowledge and interpretation of interface, subsystem of five components. Among them, the knowledge and inference engine is the core of expert systems. Knowledge is mainly used for storage provided by experts in the field of expertise, including the fact that libraries and basic rules. The function of the inference engine is based on a certain degree of reasoning strategies, select the essential knowledge base of knowledge about the user provided by the evidence argument, until the draw appropriate conclusions [1]. A1021 M7332
In addition, some expert system knowledge acquisition has also an automatic function. On the one hand, outside the Q & A with experts to gain knowledge on the other hand the system can be run continuously summarize their experience and gain knowledge from within.
3.2 Design
Is being developed for electric vehicles using lithium iron phosphate operating principle and its application in electric vehicles use an in-depth understanding and analysis of the experience of diagnostic cells of the battery in the use of ‘experts to summarize the battery of diagnostic rules. At the same time knowledge of fuzzy mathematics, first proposed affordable and practical fault diagnosis model of battery.
Fault diagnosis model under the battery on the battery using state data needs, developing data acquisition system battery and the host computer corresponding human-machine interface. Then, in accordance with the structure of expert system to build the system battery fault diagnosis. Include: Vostro 1400 battery Vostro 1510 battery
The creation of a global database
2 for a stack of Archives database
3 Establishment of the basic rule
4 The development of the Scheduler module reasoning
5 Develop modules of human computer interaction, computer program.
Finally, system troubleshooting battery for electric vehicle batteries used in diagnostic tests, VGP-BPS9 VGP-BPS9A/B battery of diagnostic tests of model parameters to make adjustments, and refining. Overall design of the structure shown in Figure 1.