Patent ID: 8555618
Filing Date: 2013-10-15
Classification: F01N,Y02T

Abstract:
1. A method for adapting the reducing agent feed during operation of an exhaust gas aftertreatment system comprising an SCR catalyst for removing nitrogen oxides from the exhaust gas of an internal combustion engine and at least one reducing agent feed device, comprising: selecting an opening time of the reducing agent feed device, operating the reducing agent feed device according to the opening time, determining whether or not a reducing agent-sensitive sensor in the exhaust gas aftertreatment system detects a presence of the reducing agent as a result of the reducing agent feed device being operated according to the opening time, in response to the reducing agent-sensitive sensor not detecting the presence of the reducing agent, automatically incrementally increasing the opening time of the reducing agent feed device by a predetermined incremental time period, and repeating the operating, determining, and incrementing steps until the reducing agent-sensitive sensor detects the presence of the reducing agent, such that the incrementally increased opening time at which the reducing agent-sensitive sensor detects the presence of the reducing agent is determined as a minimum opening time of the reducing agent feed device, wherein nitrogen oxide emission is suspended during the determination of the minimum opening time of the reducing agent feed device.