Patent ID: 9145817
Filing Date: 2015-09-29
Classification: B01D,F01N,Y02T

Abstract:
1. An apparatus for detecting whether a reducing agent injection valve is abnormally stuck, the apparatus comprising: a reducing agent supply apparatus including a control processing unit including wherein the control processing unit, when an instruction for opening the reducing agent injection valve has been issued, actuates the drive circuit for energizing the reverting valve to operate the reverting valve such that it causes a collection of the reducing agent into the storage tank from the reducing agent passage; and wherein the control processing unit, when an instruction for closing the reducing agent injection valve has been issued after the reducing agent has been collected into the storage tank, actuates the drive circuit for energizing the reverting valve to operate the reverting valve such that it causes a refilling of the reducing agent passage with the reducing agent; and wherein the control processing unit determines whether the reducing agent injection valve is abnormally stuck, based on a change in a pressure in the reducing agent passage during the refilling of the reducing agent passage with the reducing agent.