This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Detection of Catalyst Failure On-Vehicle Using the Dual Oxygen Sensor Method
Annotation ability available
Sector:
Language:
English
Abstract
On-vehicle proof-of-concept testing was conducted to evaluate the ability of the dual oxygen sensor catalyst evaluation method to identify serious losses in catalyst efficiency under actual vehicle operating conditions. The dual oxygen sensor method, which utilizes a comparison between an upstream oxygen sensor and an oxygen sensor placed downstream of the catalyst, was initially studied by the Environmental Protection Agency (EPA) under steady-state operating conditions on an engine dynamometer and reported in Clemmens, et al. (1).* At the time that study was released, questions were raised as to whether the technological concepts developed on a test fixture could be transferred to a vehicle operating under normal transient conditions.
This paper reports the results of a test program that used the dual oxygen sensor system coupled with a simulated on-board diagnostic algorithm to attempt detection of seriously deteriorated catalytic converters on a test vehicle operated over the Federal Test Procedure (FTP). This paper reports that, with some modifications, the algorithm reported in Clemmens was used to successfully distinguish between two properly converting catalysts and two poorly converting catalysts on the same test vehicle.
Recommended Content
Authors
Topic
Citation
Koupal, J., Sabourin, M., and Clemmens, W., "Detection of Catalyst Failure On-Vehicle Using the Dual Oxygen Sensor Method," SAE Technical Paper 910561, 1991, https://doi.org/10.4271/910561.Also In
References
- Clemmens William Sabourin Michael Rao Thomas “Detection of Catalyst Failure Using On-Board Diagnostics,” SAE Paper No. 900062
- Meitzler Allen H. “Application of Exhaust-Gas-Oxygen Sensors to the Study of Storage Effects in Automotive Three-Way Catalysts,” SAE Paper No. 800019
- California Air Resources Board “Revisions to Malfunction and Diagnostic System Requirements Applicable to 1994 and Later New California Passenger Cars, Light-Duty Trucks, and Medium-Duty Vehicles with Feedback Fuel Control Systems (OBD II).,” Technical Support Document