Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1995-10-06
1997-05-20
Kwon, John T.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60277, F01N 300
Patent
active
056303157
ABSTRACT:
A catalytic converter catalyst diagnostic system comprising: a catalytic converter having a catalyst; a first sensor placed in a flow path of an engine exhaust gas flowing into the catalytic converter and providing a first measurement signal indicative of a temperature of the engine exhaust gas before it enters the catalytic converter catalyst; a second sensor mounted in or behind the catalytic converter catalyst and providing a second measurement signal indicative of a temperature of the catalytic converter catalyst; and a controller coupled to the first and second sensors and receiving the first and second measurement signals therefrom, wherein the controller determines a value indicative of exothermic activity of the catalytic converter responsive to the first and second measurement signals and compares the value indicative of exothermic activity to a threshold value, wherein values below the threshold value are indicative of an improperly operating catalytic converter catalyst.
REFERENCES:
patent: 5255511 (1993-10-01), Maus et al.
patent: 5307626 (1994-05-01), Maus et al.
patent: 5339628 (1994-08-01), Maus et al.
patent: 5355671 (1994-10-01), Maus et al.
Catalytic Converter Diagnosis Using the Catalyst Exotherm, Joseph R. Theis, AC Delco Systems Div. of GMC; SAE No. 942058; Fuels & Lubricants Meeting & Exposition Baltimore, MD; Oct. 17-20, 1994.
Calculating the Rate of Exothermic Energy Release For Catalytic Converter Efficiency Monitoring; Joseph S. Hepburn and Allen H. Meitzler, Ford Motor Company; SAE No. 952423 Fuels and Lubricants Meeting & Exposition; Toronto, Ontario; Oct. 16-19, 1995.
Alternative Technologies for Studying Catalyst Behaviour To Meet OBD II Requirements; Stephen Pelters, Dietmar Schwarzenthal (Porche AG); Wolfgang Maus, Helmut Swars and Rolf Bruck (Emitec GmbH); SAE No. 932854; Fuels & Lubricants Meeting & Exposition; Philadelphia, PA; Oct. 18-21, 1993.
Alternatives for Catalyst Condition Monitoring on Gasoline Emission Control Systems: D. Williams (Lucas Auto. Ltd.); B. Bradshaw (Lucas Auto. Ltd.); No. C-422/017; pp. 1-3; Figs. 1-6.
A Catalytic Oxidation Sensor for the on Board Detection of Misfire & Catalyst Efficiency: Wei Cai & Nick Collings; University of Cambridge; No. 922248; pp. 51-62.
A Linear Catalyst Temperature Sensor For Exhaust Gas Ignition (EGI) and on Board Diagnostics of Misfire & Catalyst Efficiency; Nick Collings & Wei Cai (Univ. of Cambridge); Tom Ma (Ford Motor Co.); David Ball (Kidde-Graviner Ltd.); No. 930938; pp. 167-172.
General Motors Corporation
Kwon John T.
Simon Anthony Luke
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