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In the just-concluded Second China International Truck Fuel Contest, it can be seen from the list of winners that almost all award-winning models have one thing in common: that is, without exception, the common rail system was chosen.
Common rail system fuel saving
How do common rail systems help the vehicle achieve fuel economy? Gu Zhihua, senior manager of Bosch Diesel Co., Ltd. gave the answer.
“Common-rail system can achieve fuel economy, mainly by the characteristics of injection pressure, injection time, fuel injection quantity and multi-injection. In injection pressure, the current common rail system injection pressure can reach up to 1800bar, and the injection pressure is The injection process is separated, so high-pressure injection can be achieved even under conditions of low speed and low load.Common-rail system can also modify the set value according to the engine temperature, ambient temperature and atmospheric pressure to achieve the injection of oil in various environments. Optimized pressure: At the time of injection, the high-pressure common rail system has good flexibility and is controlled by the ECU's electric signal command, which can achieve the optimal fuel injection time under various operating conditions and achieve microseconds. The starting point of the fuel injection is measured for the unit, and the set value is corrected according to the engine temperature, the environment and the atmospheric pressure so as to optimize the injection timing in various environments.†Gu Zhihua said: “Injection quantity is used for fuel injection. The current control of the high-speed solenoid valve of the device is in microseconds, making the injection volume accurate to milligrams; in multiple injections, the second-generation common rail system can achieve up to 5 injections per cycle (2 pre-injections , 1 primary injection, 2 secondary injections, in which pre-injection can reduce engine noise and reduce nitrogen oxide emissions, while post-injection reduces emissions of soot and particulates and meets higher emission requirements.â€
Optimistic about the domestic common rail market
At present, in addition to the electronically controlled common rail system, there are electronic control unit pumps, EGR and other technical routes in the domestic market, but Bosch is full of confidence in the future common rail market. “According to the statistics on nationwide licensed cars, we expect that the number of applications of traditional mechanical fuel injection systems will be significantly reduced in recent years, and the sales ratio of electronic control systems will be further enhanced. By 2013, the emission standards will continue to increase. The mechanical injection system of China's road diesel system may be completely replaced by the electronic control system. The electronic control system has a vast market space, said Gu Zhihua.
The greater advantage of the common rail system will be reflected in meeting higher emission standards. “At present, in the phase III of the country, various technical routes in the market can basically meet emission requirements, but as the emission standards are further improved, many technical routes may encounter various obstacles in the process of upgrading, and the common rail system is The technology upgrade has been recognized by the international market. In addition, the use of common rail technology and SCR exhaust gas aftertreatment technology can not only further achieve fuel economy, but also significantly reduce nitrogen oxide emissions, said Gu Zhihua.
Localization strategy to open up the market
To gain market recognition, in addition to strong technical support, the price factor is also a realistic issue that Bosch has to consider. The sensitivity of domestic commercial vehicle users to product prices is still relatively high, and EGR and other technical routes can compete with common rail systems. It is precisely because of their important price advantages.
“Bosch now has more than 50 million common rail systems worldwide, 35 production, R&D and application bases in 19 countries around the world. In July 2004, Bosch established Bosch Automotive Diesel Co., Ltd. in Wuxi. In addition to deep cooperation with Wuxi Weifu, localization of high pressure common rail system components and active development of economical common rail system, we also rely on domestic technology centers to provide localized support to customers. And according to the needs of customers to develop systems and custom parts, to further achieve the localization of products." Gu Zhihua said.
As for the price of the common rail system, Gu Zhihua said that Bosch also hopes to come up with more competitive products, depending on two factors. "In addition to reducing the cost of product realization through localization, it depends on whether the market demand can be released on a large scale. If both conditions are relatively mature, the price of the common rail system will be able to meet the requirements of more users."