State standard flowering trees in full swing EGR engine – country , standard, car – Hardware Industry
To improve air quality, and further inhibit the automobile exhaust emissions on the environment caused by pollution, higher standards of energy conservation policy will be gradually implemented in the country. Provisions of State Environmental Protection Administration, from July 1, 2008, that is, a week after the country began standard, full stop did not meet state standards for new cars Pin Sale and registration.
So-called state , is China's third stage of auto emission standards. The third phase of the national emission standard equivalent to Euro emission standard number, that is, equivalent to Euro exhaust pollutant concentration levels, different is that new cars must have a OBD-board self-diagnostic system. Onboard diagnostic systems are characterized by increased detection of point detection system increased, the three-way catalytic converter oxygen sensors on both the import and export. Entirely through real-time monitoring vehicle emission control compliance, could be more to ensure the implementation of Euro emission standard. When the vehicle because the fuel quality and other factors, resulting in emissions did not meet Euro standard time, OBD system on their own alarm, turn into the system the default mode, the engine will not work, vehicles can only enter the special maintenance station for inspection and maintenance. And the OBD system can not be adapted in the vehicle after the factory with, so the implementation of national standards will cycle costs . Motor vehicle emissions to achieve stability in the country vehicle emission standards, vehicles must be equipped to meet the country emission standard technical measures, using the Euro standard oil.
Country standard will be implemented comprehensive enterprise test the resilience of the domestic car and technical reserves for domestic vehicles is a huge impact on enterprises. For now, to achieve national emission standard, there are two engines, one is high-pressure common rail engine, one is the EGR engines.
In both the technical realization of the country line, the high-pressure common rail technology now accounts for According to The absolute "dominant" status, almost all of the domestic heavy truck manufacturers in the process of achieving national is the technology used. The EGR technology for the country upgrades to the country, has almost not been adopted by most enterprises.
This, an industry explained that the adoption rate of these two technologies will have so much reason for the disparity, the main reason is that, in many developed countries, EGR and high-pressure common-rail line in the realization of the technology Euro when they have been used, but in Europe upgrade to the Europe when the EGR alone to achieve improved emission standards more difficult, but the high-pressure common-rail line, you can, so are the mainstream of foreign high-pressure common-rail technology achieving Europe . China's enterprises should bring about emission standards to improve the technical upgrades, and more is the introduction of foreign advanced technology, it also followed the line of foreign technology. But another question should not be overlooked is the high pressure common rail engine's fuel injection system the most critical technology currently Bosch , Denso, Delphi and so few foreign companies are "monopoly." The monopoly of this technology led to the country domestic heavy truck engine manufacturers not only can not satisfy demand, and manufacturing costs also increased significantly, more serious is the threat to some extent also to the dominance of local industrial enterprises.
EGR technology that EGR (ExhaustGasRecycle) against harmful gases (NOx) exhaust purification device settings. It will be part of the exhaust and fresh air through the intake pipe mixture into the cylinder combustion, heat the mixture to increase capacity, reduce the maximum temperature of combustion, inhibiting the formation of NOx. EGR ECU engine control computer that is under the engine speed, load (throttle opening), temperature, air flow, exhaust temperature control valve in a timely manner to open, intake manifold vacuum solenoid valve into the EGR valve by the vacuum film room, film EGR valve piece rod will open in the small part of the exhaust gas through EGR valve into the intake system, and mixed gas combustion mixture into the cylinder to participate. Involved a small number of gas mixture into the cylinder combustion, reduce the temperature of the cylinder combustion, NOx is a result of oxygen at high temperatures generated under the conditions, it inhibits the formation of NOx, which reduces emissions of NOx content. However, excessive exhaust gas recirculation to participate, it will affect the ignition mixture, performance, thus affecting the engine's power, especially in the engine idle speed, low speed, low load and cold machine, recycling of exhaust gas will significantly affect the engine performance.
So, when the engine at idle, low speed, low load and cold machines, ECU control of exhaust gas recirculation is not involved, to avoid the affected engine performance; when the engine exceeds a certain speed, load and reached a certain temperature, ECU controlled a small part of the exhaust gas recirculation to participate, and participate in recycling volume of emissions, according to engine speed, load, temperature and exhaust gas temperature varies in order to achieve the lowest NOx emissions. To Scania heavy truck diesel engines, for example, equipped with EGR and turbo-gas mixing device, will meet the quality requirements of the exhaust gas back to the engine to reduce NOx by 30%, carbon particles reduced by 80% oil, which reached Europe standard.
EGR Euro 2 emission standards and technology are produced by mature technologies, in Europe two to three technology upgrade in Europe is old technology, new applications, although it can be achieved because the country emission standard, whether the possibility of technical reasons to upgrade Having been criticized, but its low-cost, fuel-efficient, low maintenance costs and other characteristics of the users will be welcomed, EGR country Engine whether market conditions in the country stand out pre-emptive, the industry will wait and see .
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