- 专利标题： PROCEDE DE DIAGNOSTIC D'UN PIEGE A OXYDES D'AZOTE ET DISPOSITIF ASSOCIE
- 专利标题（英）： Method for diagnosing a nitrogen oxide trap and related device
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申请号： EP14780537.8申请日： 2014-09-11
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公开(公告)号： EP3060770A1公开(公告)日： 2016-08-31
- 发明人: SELLAMI, Ali , THUILLIER, Pascal
- 申请人： Renault S.A.S.
- 申请人地址： 13-15 Quai Le Gallo 92100 Boulogne-Billancourt FR
- 专利权人： Renault S.A.S.
- 当前专利权人： Renault S.A.S.
- 当前专利权人地址： 13-15 Quai Le Gallo 92100 Boulogne-Billancourt FR
- 优先权： FR1360334 20131023
- 国际公布： WO2015059375 20150430
- 主分类号： F01N3/08
- IPC分类号： F01N3/08 ; F01N11/00
摘要：
The invention relates to a method for diagnosing (200) a nitrogen oxide trap associated with an internal combustion engine (4), said trap being suitable for breaking down the nitrogen oxides stored inside of same by reaction with reducing agents, during a step of regeneration (120, 130) of the trap caused by the engine switching to rich-mixture running mode, said method including: a step of determining the weight of reducing agents consumed during a regeneration step; a step of comparing said weight with a fault threshold below which the trap is determined to be faulty; and a step of emitting a signal indicating the fault state of the trap, characterised in that the weight of reducing agents is determined during a special regeneration step (130) carried out for diagnosis purposes at a second running richness value (R2) of the engine (4) which is higher than a first running richness value (R1) of an ordinary regeneration step (120) of the trap.
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