Abgasreinigungsvorrichtung und Abgasreinigungsmethode für einen Verbrennungsmotor

Details

Veröffentlichungs-Nr.

EP3081775

Aktenzeichen

EP16164944

Anmeldetag

12. April 2016

Veröffentlichung

6. Juni 2018

Erteilung

6. Juni 2018

Rechtsraum

EP

IPC

F01N3/20B01J37/02B01D53/94F01N11/00B01J23/34B01J23/00B01J29/072

Abstract

An object is to enable efficient reduction of NOx by an NOx catalyst both when its temperature is low and when its temperature is high and improve the efficiency of reduction of NOx by the NOx catalyst, in particular when its temperature is low. An apparatus has a selective catalytic reduction NOx catalyst including at least a high-temperature catalyst layer having high capability of reducing NOx at high temperatures and a low-temperature catalyst layer having higher capability of reducing NOx at low temperatures than that of the high-temperature catalyst layer and arranged closer to a catalyst substrate than the high-temperature catalyst layer, addition means for adding a specific addition quantity of reducing agent for reducing NOx to exhaust gas flowing into the selective catalytic reduction NOx catalyst, and control means for controlling addition of the reducing agent by the addition means in such a way that the reducing agent concentration in a reducing agent atmosphere formed in the exhaust gas flowing into the selective catalytic reduction NOx catalyst is higher in the case where the temperature of the selective catalytic reduction NOx catalyst is in a specific low temperature range in which the NOx reducing capability of the low-temperature catalyst layer is higher than the NOx reducing capability of the high-temperature catalyst layer (31) than in the case where the temperature of the selective catalytic reduction NOx catalyst is in a specific high temperature range that is higher than the specific low temperature range and in which the NOx reducing capability of the high-temperature catalyst layer is higher than the NOx reducing capability of the low-temperature catalyst layer, during a reducing agent addition period, provided that said specific addition quantity is the same.

Anmelder

Firmen

TOYOTA JIDOSHA KABUSHIKI KAISHA
Toyota Jidosha Kabushiki Kaisha

Land

🇯🇵 Japan

Fachgebiete