A Case Study in DOC OBD Limit Parts' Performance and Detection FCA US LLC

Format:

Book

Conference/Event

Author/Creator:

Ahari, Holmes, author.

Contributor:

Linihan, Mike

Mates, Alex

Pauly, Thomas

Wilson, J. Parley

Conference Name:

SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

The reduction of automotive emissions is instrumental in the fight against air pollution and its eventual impact on global warming. This realization has empowered the governments around the world to mandate lower levels of vehicle emissions requiring the Original Equipment Manufacturers (OEMs) to implement advanced aftertreatment technologies in their applications. Achieving emission levels as low as SULEV30 or SULEV20 would have been impossible only a couple of decade ago, however, these lower levels of emissions are now commonly achieved through advanced control strategies and aftertreatment systems. As a part of this commitment to lower emissions, OEMs are also mandated to continuously monitor the health and performance of their aftertreatment and control components. The implementation of On Board Diagnostics (OBD) ensures that control systems are functioning robustly and the emission levels are achieved and maintained to high mileages for the life of the vehicle. To develop a robust OBD detection strategy, OEMs often create limit parts, also known as threshold parts, that mimic the failed part at the OBD emission limits. Furthermore, as often is the case, there are various methods for creating a limit part that would emit pollutant at the OBD limits. In an effort to study different approaches to Diesel Oxidation Catalyst (DOC) limit part fabrication and their corresponding performance and detection, various DOCs were created each representing a unique failure mechanism. Their emissions were measured and the impact of their damage on the emissions performance and OBD detection was investigated. From this, it was determined that only the limit DOCs which were created by cutting and aging, have sufficient separation between their failed state and their acceptable emission performance, to be adequate for OBD Limit activity during development

Notes:

Vendor supplied data

Publisher Number:

2021-01-0438

Access Restriction:

Restricted for use by site license