The limit values for harmful emissions are becoming ever stricter. The ability to comply with these values requires not only fuel combustion that is as clean as possible but also a process of exhaust gas treatment. The nitrogen oxide emissions of a modern diesel are now 96% lower than those of a typical diesel from 1990. The SCR catalytic converter (Selective Catalytic Reduction) and Denoxtronic from Bosch further reduce the remaining nitrogen by more than 90%. It therefore comes as no surprise that, in some cities, the cleaned exhaust gases are cleaner than the ambient air.
A principal component of modern SCR systems (Selective Catalytic Reduction) is the reduction agent metering system Bosch Denoxtronic. It reduces the nitrogen oxide in exhaust gas and has already been in use for heavy-duty commercial vehicles in Europe since 2004. Bosch has further developed the Denoxtronic system for use in cars, enabling nitrogen oxide emissions to be reduced by more than 90%.
Mode of operation
The Denoxtronic adds AdBlue to the exhaust gas flow. AdBlue is a non-toxic solution of urea in water. The SCR catalytic converter uses the reducing agent AdBlue to convert the nitrogen oxide in the exhaust gas into nitrogen and water.
The Denoxtronic system from Bosch constantly adjusts the amount of AdBlue administered according to the engine operating status and current exhaust gas values. Fitted with this technology, cars can even comply with the emissions limits imposed in the USA, which are currently the strictest in the world.