Patent ID: 9488080
Filing Date: 2016-11-08
CPC Classification: B01D,F01N,Y02T

Claim Text:
1. An exhaust gas purification apparatus for an internal combustion engine, comprising: a first exhaust gas purification apparatus that is provided in an exhaust passage of the internal combustion engine and has an oxidation capacity; a second exhaust gas purification apparatus that is provided in the exhaust passage downstream of the first exhaust gas purification apparatus, and has a function for selectively reducing NOx; a fuel addition valve provided in the exhaust passage upstream of the first exhaust gas purification apparatus in order to inject fuel into exhaust gas; and an electronic control unit (ECU) configured to control the fuel addition valve to execute a plurality of blockage prevention injections, wherein the blockage prevention injections are fuel injections which prevent a blockage from occurring in the fuel addition valve, and when a temperature of the second exhaust gas apparatus is within a predetermined temperature range while a predetermined condition for executing one of the blockage prevention injections is established, an amount of fuel injected during the blockage prevention injection is reduced below an amount of fuel injected when the temperature of the second exhaust gas purification apparatus is outside the predetermined temperature range.