Method for monitoring the conversion capacity of a catalytic converter
First Claim
1. A method for monitoring the conversion capacity of a catalytic converter for an internal combustion engine, which comprises:
- measuring an inlet temperature of an exhaust gas upstream of a catalytic converter;
measuring a first outlet temperature of the exhaust gas downstream of the catalytic converter;
calculating a second outlet temperature from the inlet temperature according to a temperature model;
comparing the first outlet temperature and the second outlet temperature, and assessing a conversion capacity of the catalytic converter on the basis of the comparison; and
utilizing the second outlet temperature to determine a conversion capacity of a raw emissions catalytic converter having no catalytic coating and operating under substantially the same conditions as the catalytic converter.
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Abstract
A method for monitoring the conversion capacity of a catalytic converter assesses a conversion capacity of a preliminary catalytic converter by calculating thermal energy generated in a reference catalytic converter that is not catalytically coated in accordance with a temperature model and making a comparison with a measured thermal energy generated in the preliminary catalytic converter. A measure of the conversion capacity of the preliminary catalytic converter is ascertained from the difference, and it is compared with a comparison value. The preliminary catalytic converter has an adequate conversion capacity if the difference is above the comparison value.
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Citations
12 Claims
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1. A method for monitoring the conversion capacity of a catalytic converter for an internal combustion engine, which comprises:
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measuring an inlet temperature of an exhaust gas upstream of a catalytic converter; measuring a first outlet temperature of the exhaust gas downstream of the catalytic converter; calculating a second outlet temperature from the inlet temperature according to a temperature model; comparing the first outlet temperature and the second outlet temperature, and assessing a conversion capacity of the catalytic converter on the basis of the comparison; and utilizing the second outlet temperature to determine a conversion capacity of a raw emissions catalytic converter having no catalytic coating and operating under substantially the same conditions as the catalytic converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification