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The diesel oxidation catalyst is required to remove hydrocarbons and carbon monoxide from the diesel engine exhaust stream while minimizing the impact of all other features such as cost, space, pressure drop, weight, fuel consumption, etc. The challenge of designing a catalytic converter for a particular application then becomes to: first, understand the emissions and other performance targets and requirements for the engine; second, understand the influence each of the converter parameters has on the overall system performance and; third, optimize the system using these relationships. This paper will explore some of the considerations with respect to the second of the above challenges.

Shorter new vehicle development time require new engineering methods in the concept and design phase. Therefore methods, which allow an early screening of design alternatives, have been developed and integrated in the design processes. This includes experimental (mostly bench tests) as well as simulation tools. Similar trends can be recognized in the area of exhaust gas aftertreatment. Ever tightening emissions regulations make it necessary in early stages to determine the performance of different aftertreatment concepts. Due to the fact that over 90% of the unconverted emissions occur before the converter is at operating temperature, the heat-up and light-off behavior of the converter is of major importance. In this context a numerical model has been developed to simulate the heat-up and light-off behavior.