Method for monitoring pollutant-conversion ability of catalytically coated, oxidizing exhaust gas after treatment component of exhaust system of combustion engine, involves increasing hydrocarbon amount in exhaust gas at certain temperature

摘要

The method involves increasing hydrocarbon amount in the exhaust gas at a temperature in the transition range. An unconverted hydrocarbon amount in the exhaust gas is determined downstream the to-be monitored exhaust gas after treatment components by a hydrocarbon-sensor. The exhaust gas after treatment components have a temperature-dependent conversion rate for the pollutant-conversion ability in the exhaust gas. A minimum conversion is possible at lower temperature and a maximum conversion is possible at high temperature. The hydrocarbon amount is increased by post-injection of fuel in a combustion chamber of the internal combustion engine. Independent claims are included for the following: (1) a control- and regulating unit for monitoring a pollutant-conversion ability of a catalytically coated, oxidizing exhaust gas after treatment component of an exhaust system of a combustion engine; and (2) a computer program loadable on a control- and regulating unit for executing the pollutant-conversion ability monitoring method.