Process for monitoring the function of a particulate filter
AssigneeRobert Bosch GmbH
InventorsHerbert Schoemig, Tobias Pfister
Life of this patent
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Abstract
A process for monitoring a conversion capacity of a particulate filter arranged in an exhaust gas duct of an internal combustion engine to oxidize nitrogen monoxide to nitrogen dioxide over a catalytic coating includes determining a flow resistance of the particulate filter and setting a temperature of the exhaust gas upstream of the particulate filter. A threshold for a change in the flow resistance of the particulate filter is defined. The monitoring process determines that inadequate conversion capacity of the catalytic coating of the particulate filter is reached when a change in the flow resistance of the particulate filter does not reach the defined threshold within a given period of time.
Claims6
A process for monitoring a conversion capacity of a particulate filter arranged in an exhaust gas duct of an internal combustion engine to oxidize nitrogen monoxide to nitrogen dioxide over a catalytic coating, the process comprising:
- adjusting a temperature of the exhaust gas upstream of the particulate filter over time;
- monitoring a change in a flow resistance of the particulate filter over time;
- and
- based on the monitored change in flow resistance over time, determining that inadequate conversion capacity of the catalytic coating of the particulate filter is reached when the monitored change in the flow resistance of the particulate filter does not reach a defined threshold within a given period of time.
Dependencies are inferred from the claim text.