Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1995-06-06
1999-01-19
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, F01N 320
Patent
active
058602771
ABSTRACT:
In a method and apparatus for monitoring the operating capability of a catalyzer in the exhaust duct of an internal combustion engine, the operating capability of the catalyzer is assessed on the basis of the increase in temperature produced by the exothermic conversion of the exhaust gases in the catalyzer. The increase in temperature is determined with the aid of two temperature signals, the first temperature signal being produced on the basis of a measurement downstream of the catalyzer and the second temperature signal being formed with the aid of a temperature model. The temperature model may form the temperature downstream of a completely inoperational catalyzer, a catalyzer which is still just sufficiently operational, or a catalyzer which is fully operational. The assessment of the operating capability of the catalyzer is performed on the basis of criteria which are matched to the temperature model used.
REFERENCES:
patent: 3882451 (1975-05-01), Fujishiro et al.
patent: 4656829 (1987-04-01), Creps
patent: 5303168 (1994-04-01), Cullen
patent: 5431011 (1995-07-01), Casarella
patent: 5526643 (1996-06-01), Mukaihira
patent: 5600948 (1997-02-01), Nakajima
Blischke Frank
Schnaibel Eberhard
Schneider Erich
Hart Douglas
Robert & Bosch GmbH
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