Multiple Regression Analysis of OSC Characteristics Under Transient TWC Conditions

Makoto Nagata (Auto Exhaust Catalyst Business Group, N.E.Chemcat Corporation)

TWC contain Oxygen Storage Component (OSC) materials to enhance HC, CO and NOx performance under A/F transient conditions. At the same time, it is necessary for the vehicle on board diagnostics (OBD) system to monitor that the catalyst OSC is functioning correctly. However, detailed understanding of how OSC characteristics can simultaneously match gas performance and OBD functionality are not well known.

The objective of this study is to attempt to do the multiple-analysis on OSC functions (oxygen storage capacity & oxygen release rate) and engine control conditions (Temp., A/F amplitude and frequency).