by olcoolone on Thu, 20 Nov 2008 3:28 +0000
There are two types of systems in use, the first is a particle filter that looks like a catalytic converter and is called a "DPF" (Diesel Particulate Filter) that requires regeneration by heating up the DPF.
The second way is what a lot of European manufactures using is called a "SCR" (Selective Catalytic Reduction) where by a solution is injected into the exhaust, this solution reacts with the catalyst and forms ammonia that changes the chemical structure NOx coming out the exhaust....there is a lot more to this system but to hard to explain on a forum.
The SCR system has been around since the 60's and is used in many power stations and locomotives, It allows for high constant power output of the engine but the solution has to be refilled.
Volvo trucks us a solution called "Adblue" and Mercedes-Benz uses "Bluetec", the solution is really called "Aqueous Urea Solution".
Easy Hu!