Patent Number: 9,970,341

Title: Exhaust purification system of internal combustion engine

Abstract: In an internal combustion engine, an exhaust purification catalyst, hydrocarbon feed valve, and particulate filter are arranged in an exhaust passage. Hydrocarbons are injected from the hydrocarbon feed valve by a predetermined period so as to remove NOX which is contained in the exhaust gas in first NOX removal method. While doing this, the particulate matter which is trapped on the particulate filter is removed by raising the temperature of the particulate filter in temperature elevation control. At this time, the hydrocarbon injection for the first NOX removal method is performed by the predetermined period at the preset injection pressure. During the time period when the hydrocarbon injection for the first NOX removal method is not being performed, the hydrocarbon injection for the temperature elevation control is performed by an injection pressure which is set lower than the preset injection pressure.

Inventors: Kurisaka; Itsuya (Susono, JP)

Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA

International Classification: F01N 3/00 (20060101); F01N 3/025 (20060101); F01N 3/08 (20060101); F01N 9/00 (20060101); F01N 3/035 (20060101); F01N 3/20 (20060101)

Expiration Date: 2022-05-15 0:00:00