Simulation of the Unsteady Gas Flow through a Three-way Automotive Catalyst: A Preliminary Study

2005-01-2216

05/11/2005

Event
2005 SAE Brasil Fuels & Lubricants Meeting
Authors Abstract
Content
This paper describes a model of a 1.8-litre four-cylinder four-stroke gasoline engine fitted with a close-coupled three-way catalyst (TWC). Designed to meet EURO 3 emissions standards, the engine includes some advanced emission control features in addition to the TWC, namely: variable valve timing (VVT), swirl control plates, and exhaust gas recirculation (EGR). Gas flow is treated as one-dimensional (1D) and unsteady in the engine ducting and in the catalyst. Reflection and transmission of pressure waves at the boundaries of the catalyst monolith are modelled. In-cylinder combustion is represented by a two-zone burn model with dissociation and reaction kinetics. A single Wiebe analysis of measured in-cylinder pressure data is used to determine the mass fraction burned as a function of crank angle (CA) at each engine speed. Measured data from steady-state dynamometer tests are presented for operation at wide open throttle (WOT) over a range of engine speeds. These results include CA-resolved traces of pressure at various locations throughout the engine together with cycle-averaged traces of gas composition entering the catalyst as indicated by a fast-response emissions analyser. Simulated engine performance and pressure wave action throughout the engine are well validated by the measured data.
Meta TagsDetails
DOI
https://doi.org/10.4271/2005-01-2216
Pages
11
Citation
McMackin, M., McCullough, G., and McDowell, A., "Simulation of the Unsteady Gas Flow through a Three-way Automotive Catalyst: A Preliminary Study," SAE Technical Paper 2005-01-2216, 2005, https://doi.org/10.4271/2005-01-2216.
Additional Details
Publisher
Published
May 11, 2005
Product Code
2005-01-2216
Content Type
Technical Paper
Language
English