Bibliographic Citation
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Title | Method of on-board detection of automotive catalyst degradation |
Creator/Author | Hamburg, D.R. |
Publication Date | 1992 Jan 07 |
OSTI Identifier | OSTI ID: 5433108 |
Report Number(s) | US 5077970 ;A |
Other Number(s) | Pat. Priority: US 7-536372 |
Resource Type | Patent |
Specific Type | Special Availability |
Resource Relation | Pat. File: 11 Jun 1990 |
Subject | 330700 -- Advanced Propulsion Systems-- Emission Control; CATALYSTS-- DECOMPOSITION;DECOMPOSITION-- DETECTION; AMPLITUDES;AUTOMOTIVE ACCESSORIES;FEEDBACK;FREQUENCY MODULATION |
Related Subject | CHEMICAL REACTIONS;MODULATION |
Description/Abstract | This patent describes a method of on-board detection of the degradation of an automotive catalyst which receives the emissions from the engine placed in a closed-loop feedback control with an A/F characteristic sensor.^It comprises artificially modulating at least one of the frequency and amplitude of the control for a predetermined burst; sensing an A/F characteristic by an independent sensor substantially immediately downstream of the catalyst at A/F modulation events prior to and during the burst; and determining if there is an absence of a substantial change in the independently sensed A/F characteristic when changing from one such event to the other, thus indicating a degraded catalyst. |
Country of Publication | United States |
Language | English |
Format | Pages: (vp.) |
Availability | Patent and Trademark Office, Box 9, Washington, DC 20232 (United States) |
Rights | Ford Motor Co., Dearborn, MI (United States) |
System Entry Date | 2001 May 13 |
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