New energy vehicle key technical problems to be solved
Recently, the 7th Auto Electronics Forum 2009, co-sponsored by China National Electronic Equipment Corporation, Shanghai Automotive Engineering Society and China Electronic Audio Industry Association, was held in Shanghai. The theme of this forum is "New Energy-The Rise of Chinese Automobiles". Experts from universities and representatives of well-known automotive electronics companies have delivered speeches on this, showing the research and development level of international new energy automotive electronics and China's research progress. In addition, the speakers gave suggestions and suggestions for the research and development of new energy vehicle products by independent brand vehicle and parts companies, and pointed out the problems that need attention.
New energy automotive chips must have high reliability
Compared with traditional cars, new energy vehicles not only require more chips, but also put forward higher requirements for chip quality. In addition to withstanding harsh environments such as high temperatures and high-strength mechanical vibrations, chips used in new energy vehicles must also have high reliability. For chip companies, this is a severe test and a rare opportunity. Liu Luwei, director of automotive electronics at Infineon Technologies (China) Co., Ltd., said: "The reliability of the chip has an important impact on the development of new energy vehicles. Consumers cannot accept that the failure of a small chip has caused the vehicle to be paralyzed, and vehicle companies cannot accept it. The failure of small chips affects the reputation of the brand. Therefore, new energy vehicles must use high-quality chips. "
There are two kinds of chips for automotive applications: one is an industrial chip with a relatively low price, and the other is a chip with a relatively high price specially developed for automobiles. There is a certain gap between the reliability of these two chips.
Liu Luwei said that in general, chip products have to undergo multiple tests. Although the test items of industrial chips and automotive chips are basically the same, the number of tests is quite different. For example, in the thermal shock test, each industrial chip only needs to pass 50 tests, and each car chip has to pass 1000 tests, which is 20 times that of industrial chips. In the thermal cycle test, each industrial chip needs to pass 5000 tests, and the car chip has to go through 10,000 tests. Therefore, the reliability of automotive chips is generally higher than that of industrial chips.
"In pursuit of high reliability, companies producing medium-to-high-end cars currently basically purchase automotive chips, while some companies producing low-end cars still purchase industrial chips." Liu Luwei said: "In order to ensure the reliable operation of new energy vehicles, we hope that our own brand vehicles Enterprises purchase automotive chips. "
To overcome the difficulty of battery management system
In order to better promote the development of new energy vehicles, the State clearly stated in the "Automotive Industry Adjustment and Revitalization Plan" that it is necessary to master the optimization design technology of new energy vehicle corner engines and power modules (motors, batteries and battery management systems, etc.), Large-scale production process and cost control technology. Since then, "Three Power" has become the focus of research and development of new energy vehicles.
Many people believe that in the "three electricity, the battery is the biggest obstacle to the development of new energy vehicles. However, Wei Xuezhe, director of the on-board power supply research center of the New Energy Vehicle Engineering Center of Tongji University, believes that although the performance of China's battery has a certain gap with foreign countries, there is no People think so poorly. China's battery industry already has an application foundation for new energy vehicles, especially hybrid vehicles.
"The main difficulty in developing new energy vehicles in China is the battery management system." Wei Xuezhe said that the battery management system is mainly responsible for the evaluation, management and protection of batteries, and it has a great role. On the one hand, the battery management system can monitor the operating parameters of the battery in real time to ensure the safe operation of the battery to avoid accidents such as fire or explosion due to overcharging, discharging or overheating of the battery. On the other hand, the battery management system monitors the battery operating parameters and estimates the battery status, so that each battery can be in the best working state, avoiding the life of a certain battery, and causing the entire battery to fail to work.
After the forum, our reporter conducted an exclusive interview with Wei Xuezhe. Wei Xuezhe said: "The slow development of the domestic battery management system is mainly due to the lack of support from vehicle manufacturers. R & D battery management systems not only require vehicle manufacturers to provide a combined test, but also need them to help complete the long-term on-board test of the battery management system. No With the cooperation of vehicle companies, the battery management system cannot mature. "
Special engine management system is still a "short board"
There are many types of new energy vehicles, including hybrid electric vehicles, pure electric vehicles, and fuel cell electric vehicles. Dr. He Hai, head of engine management system development at United Automotive Electronics Co., Ltd., said that from a global perspective, hybrid vehicles are at the forefront of industrialization. As one of the key technologies of hybrid vehicles, the engine management system has received extensive attention, but it is still the "short board" for the development of hybrid vehicles by domestic related companies.
According to reports, the start-stop, safety monitoring, and on-board diagnostics of hybrid robbery vehicles place higher demands on the engine management system, and the fuel system, intake system, and exhaust system need to be readjusted. He Hai explained: "For the hybrid engine management system, in the fuel system, the fuel injection quantity and other parameters need to be reset. In the intake system, the intake quantity needs to be reset and the idle throttle control is added. In terms of the exhaust system, the inspection of the exhaust temperature is mainly strengthened. "
The reporter learned that United Electronics has conducted relevant tests on the Civic 1.7 L hybrid car. The results show that the engine is optimized through the engine management system. Under urban road conditions, this car can save fuel by 14%, and under high-speed road conditions. 8% fuel saving.
He Hai appealed: "Optimizing the engine control system has a great effect on the fuel economy of the hybrid. It is hoped that various vehicle companies will adopt a special engine management system when developing hybrid vehicles."
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