Method of monitoring the operation of a catalytic converter
First Claim
1. A method for analyzing a condition of at least one partial volume of a catalytic converter through which a gas mixture flows, which comprises:
- triggering a change of at east one of chemical and physical properties of a gas mixture flowing through a catalytic converter at least twice in defined intervals for creating a particular change pattern differing from all other conceivable operational conditions in an internal combustion engine and being recognizable when observing a reaction of a measured temperature;
measuring a temperature with a sensor at least at one location or in a region within a partial volume of the catalytic converter during the change of the at least one of chemical and physical properties;
selecting the location or the region and a configuration of the sensor in such a manner that a reaction of the measured temperature resulting in the change of properties of the gas mixture is at least approximately representative of a reaction of the temperature in the partial volume;
determining set point values for the respective change in the properties of the gas mixture on the basis of a thermodynamic model while taking physical boundary conditions and properties of the partial volume into account; and
determining and comparing the measured temperature reaction with the set point values.
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Accused Products
Abstract
A method for analyzing a condition of at least one partial volume of a catalytic converter through which a gas mixture flows, includes measuring a temperature with a sensor at least at one location or in a region within a partial volume during a change of chemical and/or physical properties of the gas mixture. The location or the region and a configuration of the sensor are selected in such a way that a reaction of the measured temperature to a change of the properties of the gas mixture is at least approximately representative of a reaction of the temperature in the partial volume of the catalytic converter. Set point values are determined for the respective change in the properties of the gas mixture on the basis of a thermodynamic model while taking physical boundary conditions and properties of the partial volume into account. The reaction of the measured temperature is determined and compared with the set point values.
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Citations
32 Claims
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1. A method for analyzing a condition of at least one partial volume of a catalytic converter through which a gas mixture flows, which comprises:
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triggering a change of at east one of chemical and physical properties of a gas mixture flowing through a catalytic converter at least twice in defined intervals for creating a particular change pattern differing from all other conceivable operational conditions in an internal combustion engine and being recognizable when observing a reaction of a measured temperature; measuring a temperature with a sensor at least at one location or in a region within a partial volume of the catalytic converter during the change of the at least one of chemical and physical properties; selecting the location or the region and a configuration of the sensor in such a manner that a reaction of the measured temperature resulting in the change of properties of the gas mixture is at least approximately representative of a reaction of the temperature in the partial volume; determining set point values for the respective change in the properties of the gas mixture on the basis of a thermodynamic model while taking physical boundary conditions and properties of the partial volume into account; and determining and comparing the measured temperature reaction with the set point values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification