Understanding Sulfur Interaction Key to OBD of Low Emission Vehicles Engelhard Corporation

Format:

Conference/Event

Author/Creator:

Tauster, Sam, author.

Conference Name:

International Fuels and Lubricants Meeting and Exposition (2000-10-16 : Baltimore, Maryland, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2000

Summary:

As the automobiles move closer to the ULEV, ULEV-2 and SULEV requirements, OBD (on board diagnostic) will become a design challenge. The present OBD II designs involve the use of dual oxygen sensors to monitor the hydrocarbon performance of the catalytic converter. The aim of this study was twofold:Catalyst samples were aged on a spark ignited engine using a "fuel cut" engine aging cycle operated for 50 hours. Maximum catalyst temperatures during this aging cycle were 850-870°C. The effect of sulfur was determined by measuring aged catalyst performance using both indolene (100 ppm sulfur) and premium unleaded gasoline (350 ppm sulfur). The test for OBD performance was an oxygen storage capacity determination. The delay time between a front and a rear oxygen sensor was measured, as the engine was transitioned from a rich operating mode to a lean operating mode.This study showed that higher levels of fuel sulfur were associated with longer OBD delay times for both fresh and engine-aged catalysts, and that introduction of high fuel sulfur gasoline can cause errors in an OBD calibration algorithm developed for use with a low sulfur content gasoline

Notes:

Vendor supplied data

Publisher Number:

2000-01-2929

Access Restriction:

Restricted for use by site license