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Influence of Oxygen Storage Characteristics on Automobile Emissions
Technical Paper
1999-01-1076
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The catalytic performance and On-Board Diagnostics (OBD) of the manifold catalyst having high Oxygen Storage Capacity (OSC) are described in this paper.
First of all, we compared the performance of three-way catalysts containing Cerium - Zirconium - Yttrium oxide with Cerium - Zirconium oxide. Three-way catalysts dispersed Pt, Rh and Pd on Cerium - Zirconium - Yttrium oxide showed excellent catalytic performance especially at cold starting and at transient states, after high temperature aging at 1050°C. The performance of these catalysts was studied using the Driving Mode Simulation Dynamometer, which was developed in-house, and oxygen storage and release responses were compared in actual gas.
Then we investigated the possibility of on-board diagnostics of catalyst deactivation with high OSC in manifold and close-coupled positions, a diagnostic which is usually assumed to be difficult to attain with present conventional technology. We achieved finding a correlation between the HC emission of catalysts and the delay in response of two exhaust gas sensors even at high temperatures (700°C) with high gas flow rate.
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Citation
Tan, I., Yamamoto, M., Yamada, K., and Tanaka, H., "Influence of Oxygen Storage Characteristics on Automobile Emissions," SAE Technical Paper 1999-01-1076, 1999, https://doi.org/10.4271/1999-01-1076.Also In
References
- Tanaka H. Yamamoto M. “Improvement in Oxygen Storage Capacity” SAE Paper 960794 1996
- Yamada K. Tanaka H. Yamamoto M. “Oxygen Storage Capacity on Cerium Oxide-Precious Metal System” SAE Paper 970464 1997
- Tanaka H. Tan I. Yamada Koji Yamamoto M. “Oxygen Storage Components for Three-Way Catalysts” ISATA 1998
- Yamamoto M. Tanaka H. “Influence of Support Materials on Durability of Palladium in Three-Way Catalyst” SAE Paper 980664 1998
- “OBD-II Performance of Three-way Catalysts” Automot Eng Int July 1998 33
- Tanaka H. Fujikawa H. Takahashi I. “Excellent Oxygen Storage Capacity of Perovskite-Pd Three-Way Catalysts” SAE Paper 950256 1995
- Serizawa T. Tan I. Tanaka H. “Virtual Vehicle System for Development of Clean Emission Engines” FISITA 1998