Technical Paper
NOx Trap Model For Lean Burn Engine Control
2003-06-23
2003-01-2292
One of the most environmental problems nowadays is the reduction of the global CO2 emissions. In the field of automotive transportation, car manufacturers in Europe plan to reach the level of 140 g(CO2)/km in 2008) [1]. At this level, one of the most viewable solution is the use of lean-burn engines. This kind of engines are known for their combustion efficiency, but they present a major inconvenience: NOx emissions and their post-treatment. Some technical solutions have been provided in the past years such as DeNOx catalysts. However these solutions won't be compatible with future European legislations: limits of diesel engine emissions will reach 0.25 g(NOx)/km in 2005. One possible technology to overcome - such severe limits - is the NOx trap catalyst proposed by TOYOTA [2], which is already used by some car manufacturers on serial vehicles (such as PSA [3] and VW [4]).