Modeling Three-Way Catalyst Converters during Cold Starts and Potential Improvements

Xieyang Yan, Ryota Sone, Ryoya Inoue, Jin Kusaka, Katunori Umezawa, Yasuhiro Kondo

Research output: Contribution to journalConference article

Abstract

Three-way catalyst (TWC) converters are often used to purify toxic substances contained in exhaust emissions from gasoline engines. However, a large amount of CO, NOx and THC may be emitted before the TWC reaches its light-off temperature during a cold start. In this work, a numerical model was developed for studying the purification performance of a close-coupled TWC converter during the cold start period. The TWC model was built using axisuite, commercial software by Exothermia S.A. Model gas experiments were designed for calibrating the chemical reaction scheme and corresponding reaction rate parameters in the TWC model. The TWC model was able to simulate the purification performance of CO, NOx and THC under both lean and rich air-fuel equivalence ratios (λ) for different conditions. The light-off temperature and oxygen storage capacity (OSC) behavior were also successfully validated in the model. Vehicle tests were conducted on a chassis dynamometer to verify the TWC model. The simulation achieved good agreement with the experimental data during a cold start. Based on the validated model, a parametric analysis was conducted on key parameters to propose an optimized design with improved purification performance for future TWC production.

Original languageEnglish
JournalSAE Technical Papers
Issue numberDecember
DOIs
Publication statusPublished - 2019 Dec 19
Event2019 JSAE/SAE Powertrains, Fuels and Lubricants International Meeting, JSAE 2019 - Kyoto, Japan
Duration: 2019 Aug 262019 Aug 29

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

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