Patent ID: 8484949
Filing Date: 2013-07-16
Classification: F01N,Y02T

Abstract:
1. A method for monitoring of an after treatment injector (ATI) located in an exhaust gas system of an internal combustion engine, the exhaust gas system comprising: an exhaust gas purification unit, an after treatment substance injection system (ATSIS) including an on board diagnosing (OBD) system which is connected to the ECU and the pressure sensor, either directly or via the ECU, the OBD being provided with comparative data for deciding functionality of the ATI in order to detect abnormal functionality of the ATI, the method comprising I. setting the flow regulator to open and setting the ATI to be closed, II. closing the flow regulator and keeping the ATI closed, III. keeping the flow regulator closed and opening the ATI, IV. keeping the flow regulator closed and closing the ATI without opening the flow regulator before closing the ATI, and V. opening the flow regulator to open and keeping the ATI closed,