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expert diagnosis system for the development of the status quo at home and abroad

According to the International Electrotechnical Society (IEC) in 1995, developed Aspire 1410 battery management system standards, and electric vehicle battery management system must have a certain battery diagnostic functions, including unhealthy cells and to provide early warning information on the battery aging. During these 10 years, major foreign companies conduct a vigorous research studies, and in its operation using the battery management system by adding a certain amount of battery diagnostics. One representative of the company, and Mentzer Electronic GmbH in Germany, led by Werner Retzlaff designed BADICOaCH system; U.S. Aerovironmevt developed SmartGuard System (Long - Life Battery Using Intelligent Modular Control System).

(1) BADICOaCH System

BADICOaCH system is BADICHEQ system improvements, it has a battery diagnostic-related functions: on the recent 24 charge-discharge cycles to store TravelMate 4500 detailed data and allow good and bad judgments on the battery when the battery quickly find basic information and errors are used;

(2) SmartGuard System

SmartGuard system has a battery diagnostic-related functions are mainly to provide reverse polarity alarm and battery discharge history and archives.

Domestic battery fault diagnosis also has certain research, such as Chunlan Research Institute, Tsinghua University, but most of the research is still in its early stages.

In this paper, the battery fault diagnosis study is to find fault with the LCBTP03003 battery cell performance parameters to one or the relationship between N, through real-time monitoring, comparing the same battery of different parameters between single cell changes and consider some other factors to carry out a comprehensive diagnosis. After years of study, has concluded with a pre-feasibility study of algorithms and experiments in electric car sports car for battery diagnostics. His thinking is the same one every single battery charge and discharge the battery at the same current, the majority of each single cell performance was similar, but there are some inconsistencies in the performance of the battery. Through an integrated consideration of various cells during this time, on the average voltage offset and various battery voltage during this time period can be estimated changes in battery performance is good or bad. Small and single-cell voltage offset voltage change is relatively small, A42-A3 good battery performance. Because there is no failure was the performance of a battery charging voltage increase for the slow discharge voltage drops slowly.

3 Fault Diagnosis Expert System

3.1 Expert System

An expert system is a system of procedures for a large number of expertise. It can provide knowledge in the area of a particular reasoning to Aspire 1300 simulate the human expert in a field decision-making process to resolve those in need of experts to solve complex problems.

Mainly by the expert system knowledge base, inference engine, working storage area, access to knowledge and interpretation of interface, subsystem of five components. Among them, knowledge base and inference engine is the core of expert systems. Knowledge is mainly used to store provided by experts in the field of expertise, which includes the fact that library and the rule base. Function of the inference engine is based on certain reasoning strategies selected from the knowledge base of relevant knowledge, provide evidence of reasoning, until the draw the appropriate conclusions [1].

In addition, some experts knowledge acquisition system also has an automatic function. On the one hand from the outside through the Q & A with experts to acquire knowledge, on the other hand the system can be run constantly sum up their experience and gain knowledge from the inside. BTP-APJ1

3.2 Design

Is currently being developed for electric vehicles using lithium iron phosphate battery working principle and its application in electric vehicles use an in-depth understanding and analysis of the battery cell diagnostics experience in the use of experts to sum up the battery diagnostic rules. At the same time knowledge of fuzzy mathematics, initially proposed a reasonable and practical battery fault diagnosis model.

Fault diagnosis model under the battery on the battery using the state data needs, development of battery data acquisition system and the corresponding host computer human-machine interface. Then in accordance with the structure of expert system to build the battery fault diagnosis system. Include: BTP-AQJ1

The establishment of a Global Database

2 for a battery archives database

3 establishment of the rule base

4 development of reasoning scheduler module

5 develop human-computer interaction program modules.

At last, the battery fault diagnosis system for electric vehicle batteries used in diagnostic tests, in the test battery diagnostic model parameters to achieve the adjustment, so perfecting. Overall design of the structure shown in Figure BTP-ARJ1