VOLVO SCR Update

The following is from the volvoscr.com website 06.23.2011

 

 

SCR was already good.
Now we’ve made it even better.

NO REGEN ENGINE
When the EPA introduced new emission standards for diesel engines back in 2002, Volvo chose Selective Catalytic Reduction (SCR) as the technology which most efficiently solved the problem of NOx emissions and particulate matter. Our approach combined the best aspects of Exhaust Gas Recirculation (EGR) with a Diesel Particulate Filter (DPF) and a Catalytic Converter to provide the best possible solution.

Active regeneration is a thing of the past.
With Diesel Particulate Filter aftertreatment, the DPF periodically accumulates particulate matter, or soot, which must be eliminated using a process of active or passive regeneration. In passive regeneration, the NOx is actually used to chemically regenerate the soot in a process that is continuous, low temperature, and automatic.

With EPA ’07 technology, the amount of available NOx is not sufficient for regenerating the DPF. To meet the ’07 standard, engine manufacturers resorted to “active regeneration,” where diesel fuel is added to simply oxidize the soot.  This process occurs at a temperature of 1100 degrees or more. The driver must be made aware of high exhaust temperatures when they occur, and must in some cases inhibit or re-enable active regeneration.

For EPA ’10, the Volvo SCR solution eliminates soot using only passive regeneration in nearly all applications. This virtual elimination of active regeneration is what we call the “No Regen Engine.” For normal on-highway operation, active regeneration has been totally eliminated. No dash lights come on. No special driver training. Reduced fuel consumption. Lower operating costs.