DESIGN AND OPTIMIZATION OF CATALYTIC CONVERTERS TAKING INTO ACCOUNT 3D AND TRANSIENT PHENOMENA AS AN INTEGRAL PART IN ENGINE CYCLE SIMULATIONS

摘要

The Discrete Channel Method (DCM) is presented as a new approach to model the transient multidimensional behavior of honeycomb-type catalytic converters. DCM combines a detailed modeling of effects taking place inside individual channels with the description of thermal effects occurring in the entire converter. The model is compared to experimental data measured under adiabatic conditions and to solutions generated by the finite difference method. DCM is applied to simulate the light-off behavior for different exhaust gas compositions under adiabatic and non-adiabatic conditions. The results show the influence of changing gas compositions and of radial heat losses on the performance of catalytic converters and aftertreatment systems. Hence, DCM is an effective and computationally fast method tailored for the integration in the engine analysis tool BOOST but also for stand-alone catalyst simulation.