Improvement of Engine Emissions Tower Three-Way Catalyst by the Periodic Operations 872098
The effects of “periodic operation (variations of both A/F modulation width and their frequency)” on the activities of fresh and aged Pt/Rh catalysts were systematically evaluated on engine dynamometer in terms of A/F and cold-start performance. A/F modulation width and its frequency were varied from ±2 to ±10% A/F and from 0.5 to 5 Hz, respectively. The periodic operation effects for both catalysts were the most preferable for diminishing THC emission and a little effect was obtained for CO emission. A remarkable improvement of NOx emission on the aged catalyst was confirmed, although a medium effect was appeared on the fresh catalyst.
Citation: Matsunaga, S., Yokota, K., Muraki, H., and Fujitani, Y., "Improvement of Engine Emissions Tower Three-Way Catalyst by the Periodic Operations," SAE Technical Paper 872098, 1987, https://doi.org/10.4271/872098. Download Citation
Shin-ichi Matsunaga, Koji Yokota, Hideaki Muraki, Yoshiyasu Fujitani
Toyota Central Res. & Dev. Labs., Inc.
1987 SAE International Fall Fuels and Lubricants Meeting and Exhibition