Method for monitoring the catalytic activity of a catalytic conv

Details Method for monitoring the catalytic activity of a catalytic conv Method for monitoring the catalytic activity of a catalytic conv

1993-03-01

1994-08-23

Nelli, Raymond A.

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

60274, F01N 320

Patent

active

053396286

ABSTRACT:
A method for monitoring catalytic activity of a catalytic converter through which exhaust gas can flow in an exhaust system of an internal combustion engine includes measuring a temperature at least at two temperature measuring sensors and periodically repeatedly determining a temperature measuring variable from signals issued by the sensors during operation of the engine with an engine monitoring system. According to one method, the sensors are spaced apart in flow direction in or near the catalytic converter, the temperature measuring variable is averaged over a sufficiently long period of engine operation to average out special strains and form a mean temperature value, catalytic activity is ascertained by comparing the mean temperature value with a predetermined limit value, and a report is issued if the mean temperature value does not correspond to the limit value. According to another method, the sensors are associated with the catalytic converter, further measuring variables characterizing an applicable operating state of the engine are determined, a temperature limit value is determined from the further measuring variables, catalytic activity is determined by comparing the temperature measuring variable with the temperature limit value, and a report is issued if the temperature measuring variable is lower than the temperature limit value.

REFERENCES:
patent: 3766536 (1973-10-01), Hile
patent: 4122720 (1978-10-01), Podl
patent: 4617794 (1986-10-01), Fufitani et al.

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