Diagnosevorrichtung und Diagnoseverfahren für einen Nox-Sensor

Details

Veröffentlichungs-Nr.

EP3372800

Aktenzeichen

EP18160654

Anmeldetag

8. März 2018

Veröffentlichung

25. Dezember 2019

Erteilung

25. Dezember 2019

Rechtsraum

EP

IPC

F01N3/20F01N11/00

Abstract

An object is to prevent a wrong diagnosis from being made in diagnosis of an NOx sensor provided downstream of an SCR catalyst. A diagnosis apparatus is applied to an NOx sensor provided in an exhaust system including an SCR catalyst, a reducing agent supply device, an NOx sensor provided downstream of the SCR catalyst, an exhaust gas purification device provided upstream of the SCR catalyst, a temperature raising unit that performs a temperature raising process to raise the temperature of the exhaust gas purification device, and a control unit that controls supply of reducing agent so as to adjust the ammonia adsorption amount to a specific amount. The diagnosis apparatus includes a diagnosis unit that performs diagnosis of the NOx sensor on the basis of the concentration of ammonia slipping out of the SCR catalyst when the temperature of the SCR catalyst is equal to or higher than a specific temperature and a disallowance unit that disallows diagnosis of the NOx sensor by the diagnosis unit since the ammonia adsorption amount is adjusted to the specific amount by the control unit until a specific time elapses.

Anmelder

Firma

TOYOTA JIDOSHA KABUSHIKI KAISHA

Land

🇯🇵 Japan

Fachgebiete