Patent ID: 8387366
Filing Date: 2013-03-05
Classification: F01N,Y02T

Abstract:
1. A reducing agent injection valve abnormality detection device for detecting clogging of the reducing agent injection valve, comprising: a reducing agent injection device equipped with a storage tank that houses a reducing agent, a pump that pressure-feeds the reducing agent, a reducing agent injection valve that injects the reducing agent pressure-fed by the pump into the inside of an exhaust pipe of an internal combustion engine, a supply path that interconnects the pump and the reducing agent injection valve, and a pressure sensor that is disposed in the supply path, with the reducing agent injection device being configured to suck, into the inside of the supply path, a gas inside the exhaust pipe via an injection hole in the reducing agent injection valve by subjecting the inside of the supply path to depressurization processing, wherein the reducing agent injection valve abnormality detection device includes a clogging determination component that uses a pressure value detected by the pressure sensor after the start of the depressurization processing to determine whether or not clogging is occurring in the reducing agent injection valve.