MAN was the first, and is still the only manufacturer to use the common rail system in all of its engine series starting in 2004. The system is the basis for satisfying current and future emissions standards for all engines between 150 and 680 hp. Common rail engines set themselves apart from other engines with their quiet engine operation, low noise and pollutant emissions and optimum control of the injection process, which makes it possible to reduce fuel consumption.
The common-rail system makes it possible to inject the fuel several times per combustion and at any time -- and thus to optimise the combustion. The diagram shows the injection pressure curve for pilot and main injection.This optimisation of the combustion results in fewer soot particles. At the same time fuel consumption is minimised.
The innovative EGR technology reduces the number of pollutants formed early on in the process right in the combustion chamber of the cylinder -- without any additives whatsoever. The cooled exhaust gas recirculation has been standard at MAN since 2000. With this technology, TGL and TGM trucks don't need additives or additional tanks and they offer more payload and assembly space on the frame.
The recirculation of exhaust gas lowers the combustion temperature.
The recirculated exhaust gas impedes the chemical reaction, which forms oxides of nitrogen during combustion -- this leads to a lower level of oxides of nitrogen.
An extremely effective charge air system is used in the engines of the D08 series to reach the Euro 5 emission standard on an EGR basis. Two-stage turbocharging allows for the optimum engine calibration in terms of performance characteristics and exhaust emissions.
To optimise heat management in the engine, the higher engine ratings even work with a separate charge air coolant system with a lower coolant temperature. The additional water-air low temperature cooler of the charge air system is positioned right in front of the actual engine radiator.
The MAN AdBlue® technology is currently the most cost-efficient Euro 5 solution in the heavyweight vehicle class. It offers the customer the lowest fuel consumption possible and increased transport efficiency for long-haul transport. MAN developed SCR systems as early as 1995 as part of the world's first customer field trial and can therefore rely on convincing arguments for a proven system.
MAN thus already has the expertise from its many years of experience with the EGR, common rail and SCR technology -- the key to meeting the emissions standards of today and the future such as Euro 6.