Method for monitoring the conversion capacity of a catalytic converter
AssigneeSiemens Aktiengesellschaft
InventorsHong Zhang, Johannes Beer
Life of this patent
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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.
Claims12
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.
Dependencies are inferred from the claim text.