Vorrichtung zur Verschleissdiagnose für eine Abgasreinigungseinrichtung

Details

Veröffentlichungs-Nr.

EP3056702

Aktenzeichen

EP16155486

Anmeldetag

12. Februar 2016

Veröffentlichung

21. Juni 2017

Erteilung

21. Juni 2017

Rechtsraum

EP

IPC

F01N3/08F01N3/10F01N3/20F01N11/00F01N13/00F02D41/14F02D41/02B01D53/94

Abstract

A deterioration diagnosis device for an exhaust gas purification apparatus which performs inducement processing when the internal combustion engine (1) is operated at a lean air fuel ratio, measures, by means of air fuel ratio sensors, the air fuel ratio of exhaust gas flowing into the SCR catalyst (6) and the air fuel ratio of exhaust gas flowing out from the SCR catalyst (6) during a period while the inducement processing is performed, and diagnoses deterioration of the SCR catalyst (6) based on a difference between the measured values of these sensors, wherein an amount of hydrogen produced by each of a three-way catalyst and an NSR catalyst (5) is estimated based on the deterioration degree thereof, and an air fuel ratio of exhaust gas discharged from the internal combustion engine is feedback-controlled so that the air fuel ratio of the exhaust gas flowing into one of the three-way catalyst and the NSR catalyst (5) in which the hydrogen production amount thus estimated is larger than that in the other becomes a target value.

Anmelder

Firma

Toyota Jidosha Kabushiki Kaisha

Land

🇯🇵 Japan

Fachgebiete