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Title Method of on-board detection of automotive catalyst degradation
Creator/Author Hamburg, D.R.
Publication Date1992 Jan 07
OSTI IdentifierOSTI ID: 5433108
Report Number(s)US 5077970 ;A
Other Number(s)Pat. Priority: US 7-536372
Resource TypePatent
Specific TypeSpecial Availability
Resource RelationPat. File: 11 Jun 1990
Subject330700 -- Advanced Propulsion Systems-- Emission Control; CATALYSTS-- DECOMPOSITION;DECOMPOSITION-- DETECTION; AMPLITUDES;AUTOMOTIVE ACCESSORIES;FEEDBACK;FREQUENCY MODULATION
Related SubjectCHEMICAL 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 PublicationUnited States
LanguageEnglish
FormatPages: (vp.)
AvailabilityPatent and Trademark Office, Box 9, Washington, DC 20232 (United States)
RightsFord Motor Co., Dearborn, MI (United States)
System Entry Date2001 May 13

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