Method for monitoring a catalytic converter
AssigneeRobert Bosch GmbH
InventorsAndreas Genssle, Torsten Handler, Tobias Pfister
Life of this patent
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Abstract
A method for monitoring the capability of a catalytic converter to convert nitrogen monoxide into nitrogen dioxide in the exhaust gas of an internal combustion engine, the catalytic converter being arranged in an exhaust gas duct of the internal combustion engine and the catalytic converter being followed downstream by a collecting particle sensor. It is in this case provided that, in a monitoring cycle, a decrease in the particle loading of the particle sensor during the operation of the internal combustion engine under predetermined operating conditions is taken to conclude an adequate capability of the catalytic converter to convert from nitrogen monoxide to nitrogen dioxide.
Claims8
A method for monitoring the capability of a catalytic layer to convert nitrogen monoxide into nitrogen dioxide in the exhaust gas of an internal combustion engine, the catalytic layer being arranged in an exhaust gas duct of the internal combustion engine and the catalytic layer being followed downstream by a collecting particle sensor, the method comprising:
- providing particles to the particle sensor to carry out a monitoring cycle,
- in the monitoring cycle, the particle sensor is used to determine a decrease in a particle loading during the operation of the internal combustion engine under predetermined operating conditions which is taken to conclude an adequate capability of the catalytic layer to convert nitrogen monoxide to nitrogen dioxide, and
- before the monitoring cycle or at the beginning of the monitoring cycle, an adequate amount of particles for an evaluation of an output signal of the particle sensor is deposited on the particle sensor.
A method for monitoring the capability of a catalytic layer to convert nitrogen monoxide into nitrogen dioxide in the exhaust gas of an internal combustion engine, the catalytic layer being arranged in an exhaust gas duct of the internal combustion engine and the catalytic layer being followed downstream by a collecting particle sensor, the method comprising:
- providing particles to the particle sensor to carry out a monitoring cycle,
- in the monitoring cycle, the particle sensor is used to determine a decrease in a particle loading during the operation of the internal combustion engine under predetermined operating conditions which is taken to conclude an adequate capability of the catalytic layer to convert nitrogen monoxide to nitrogen dioxide, and
- a regeneration of the particle sensor is delayed until an adequate amount of particles for carrying out the monitoring cycle has been deposited on the particle sensor.
A method for monitoring the capability of a catalytic layer to convert nitrogen monoxide into nitrogen dioxide in the exhaust gas of an internal combustion engine, the catalytic layer being arranged in an exhaust gas duct of the internal combustion engine and the catalytic layer being followed downstream by a collecting particle sensor, the method comprising:
- providing particles to the particle sensor to carry out a monitoring cycle, in the monitoring cycle, the particle sensor is used to determine a decrease in a particle loading during the operation of the internal combustion engine under predetermined operating conditions which is taken to conclude an adequate capability of the catalytic layer to convert nitrogen monoxide to nitrogen dioxide,
- determining a flow of current between two interdigital electrodes of the particle sensor, and
- concluding an adequate capability of the catalytic layer to convert nitrogen monoxide to nitrogen dioxide if the flow of current between the interdigital electrodes decreases during the operation of the internal combustion engine.
Dependencies are inferred from the claim text.