Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1995-06-07
1996-10-01
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60277, F01N 320
Patent
active
055602002
ABSTRACT:
A catalytic converter has a carrier structure and a catalytically active coating adhering to the carrier structure, and is disposed downstream of an internal combustion engine of a motor vehicle for cleaning exhaust gas. A method for functional monitoring of the catalytic converter includes determining a temperature of the catalytically active coating and/or of the structure of the catalytic converter at least at one location. A temperature of the exhaust gas is determined upstream of the at least one location of the catalytic converter. At least first derivatives over time of both temperature values are formed. A difference of the derivatives over time is formed. An instant after a start of the engine at which the difference changes its sign is ascertained. An apparatus for functional monitoring of the catalytic converter includes at least one measuring sensor for measuring a temperature of the carrier structure and/or of the catalytically active coating. At least one device determines an exhaust gas temperature. A differentiation circuit forms derivatives over time of the measured or determined temperatures. A subtraction circuit forms a difference between the two derivatives over time. A comparison circuit ascertains an instant at which the difference changes its sign.
REFERENCES:
patent: 3837165 (1974-09-01), Arrigoni
patent: 3957444 (1976-05-01), Goto
patent: 5339628 (1994-08-01), Maus
patent: 5419122 (1995-05-01), Tabe
Bruck Rolf
Maus Wolfgang
Swars Helmut
Emitec Gesellschaft fuer Emissions-technologie mbH
Greenberg Laurence A.
Hart Douglas
Lerner Herbert L.
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