Benz BLUETEC is a modular concept, which coordinate the different technical solutions to achieve minimize harmful emissions of diesel engine, and achieve the efficient exhaust gas treatment. In its workflow, all hazardous substances gradually, continuing to be reduced. BLUETEC technology is based on an original Benz diesel engine system solutions, and particulate emissions can be reduced to effectively reduce nitrogen oxides, it is one of the most clean diesel engine technology. BLUETEC is an advanced exhaust after treatment technology, according to the US Environmental Protection department statistics, the use of BLUETEC diesel engine, reducing 98 percent of particulate emissions, can reduce harmful gas emissions by 80 percentage.
In the first stage, by internal adjustment measures to minimize engine emissions untreated, these measures include:
1. An improved electronic engine control system;
[123 ] 2, the compression ratio to 16.5: 1;
3 using special piezo-injectors having a lower fuel flow rate;
4, optimizing the turbocharger, having a variable nozzle turbocharger; recirculation rate
5, improved exhaust gas recirculation control, improved;
6, a ceramic glow plug, ensuring the low compression ratio when ready to quickly cold start.
In the second stage, improvements added internal engine aftertreatment system is effective specially configured this engine, including carbon monoxide can be reduced and oxidized catalytic converter emissions of unburned hydrocarbons.
while the third stage is the application of the measures do not need a diesel particulate filter additive. Since the summer of 2005, the diesel particulate filter in many countries has been all Mercedes – Benz models equipped with a standard diesel engine, it can reduce particulate emissions by 98 percent. This makes Mercedes – Benz diesel models easily reach the current Euro IV particulate limit values (0.025 g / km) and the future Euro V requirements particulate limits (0.005 g / km), but also in line with the current US standard.
The fourth stage is required to reduce the concentration of nitrogen oxides. And gasoline phaseA higher concentration of nitrogen oxides in emissions than untreated, the diesel engine, which is an inherent characteristic of the combustion process caused by the special. At this stage, BLUETEC after application is currently the most efficient exhaust gas processing method – a selective catalytic reduction (SCR) process: generates ammonia and the SCR catalytic converter and a further development of the vehicle through oxynitride storage-type catalytic converter a combination of the patented process, nitrogen oxides can be reduced 80 percentage.
In conventional emission standards which, CO2 emissions and not to limit the discussion on the current and future emission standards and also do not realize it, but this just is worthy of attention focused on a . In fact, the carbon dioxide emissions and fuel consumption has a direct relationship, the value of carbon dioxide emissions 140 g / km is another expression of fuel, equivalent to about 5.3 liters of diesel / 100 km or 5.9 liters of gasoline / 100 km. Therefore, can effectively reduce carbon dioxide emissions BLUETEC technology undoubtedly has very important significance. In addition, the processing system may be reduced and then the exhaust gas components other than carbon dioxide (e.g., nitrogen oxides, carbon monoxide, hydrocarbons and particulate combustion residues), and sometimes even reduced to a value testability, which is innovative the modular aftertreatment system BLUETEC at the role of play. BLUETEC create the conditions for environmental protection operation of the diesel vehicles, and will be able to reach future emission limits program implementation.
In October 2006, Mercedes – Benz plans to launch BLUETEC passenger car in the United States, introduced the E 320 BLUETEC passenger car was the only application of this technology, and thus became the only California and other states to achieve the signed manufacturer stringent emission standards. The move by the international automotive industry reporter appreciation, they will be named the E 320 BLUETEC “2007 World Green Car”, the judges from 22 countries will be hailed as a model ultra-clean BLUETEC diesel technology is new. At the same time Mercedes – Benz since 2008, in the United States formally listed launched three BLUETEC models, they are level GL320 CDI BLUETEC, ML320 CDI BLUETEC level and R320 CDI BLUETEC class car.
BLUETEC technology is also used in commercial vehicles, because of their “effectiveness” and “practical” and a good reputation, and now applies to all commercial vehicle series. Currently, Mercedes – Benz has delivered more than 60,000 vehicles use BLUETEC technology for trucks and buses.