|Authors: || R. Douglas, B. P. Carberry |
|Title: ||Modeling of Oxidation Catalysts for Two-Stroke Cycle Engines|
|Date: || August 1996 |
|Published:|| SAE Off-Highway Meeting - Indianapolis, Indiana - SAE 961807 |
The after-treatment of exhaust gas using 3-way catalytic converters is now normal practice in automotive
applications. For other applications such as outboards, motorcycles and utility engines new legislation is
now in place in both Europe and North America. Further reductions of the permitted emission levels require
the use of catalysts for two-stroke engine applications. However, current automotive catalyst systems are
not suitable for durable operation in most two-stroke engines and new analytical tools are required to aid
the development engineers in implementation of revised designs and operating strategies
This paper reviews the range of modeling techniques which have been developed for automotive uses and
presents new and modified models suitable for two-stroke engines. This requires particular emphasis to be
placed on the oxidation reactions that predominate in the two-stroke engine exhaust. Several types of model
are reviewed using both phenomenological and theoretical methods. The applicability and accuracy of each
model is considered and compared with experimental results. In each case, the thermodynamic and gas dynamic
aspects and the limitations of the models are explained.
Finally, the future direction of modeling is outlined, in the light of current requirements and
recommendations are made for the evolution of a catalyst simulation suitable for use in a full engine model.
You may obtain a copy of this paper by calling SAE Customer Service at 1-877-606-7323 (toll-free in the U.S. and Canada) or 1-724-776-4970.