公开(公告)号：EP2469274A1

公开(公告)日：2012-06-27

申请号：EP11194598.6

申请日：2011-12-20

申请人： NGK Spark Plug Co., Ltd.

发明人： Kato, Kenji ,  Ito, Kouhei

IPC分类号： G01N27/419 ,  G01N27/407

CPC分类号： G01N27/419

摘要： [Objective] To provide a gas sensor which can improve the sensitivity to NO x .
[Means for Solution] A reduction section 18 for reducing NO 2 contained in exhaust gas to NO is provided on the upstream side of a first diffusion resistor section 103 provided to limit the flow of the exhaust gas into a first measurement chamber 101. When NO x passes through the first diffusion resistor section 103, NO 2 which is greater in molecular weight than NO is lower in the degree of diffusion than NO. Since NO 2 is reduced to NO at the reduction section 18, the exhaust gas passing through the first diffusion resistor section 103 hardly contains NO 2 . Therefore, the speed of flow of NO x through the first diffusion resistor section 103 is not limited by NO 2 , whereby sensitivity for detection of NO x can be improved.

摘要翻译： [目的]提供一种可提高对NOx的灵敏度的气体传感器。 [解决手段]在第一扩散阻力部103的上游侧，设置用于将废气中所含的NO 2还原为NO的还原部18，该第一扩散阻滞部103设置成限制废气向第一测定室101内的流动。 通过第一扩散电阻部分103，分子量大于NO的NO2的扩散程度低于NO。 NO 2在还原部18被还原成NO，因此通过第一扩散阻力部103的排气几乎不含有NO 2。 因此，通过第一扩散电阻部103的NOx的流动速度不受NO2的限制，由此可以提高用于检测NOx的灵敏度。

公开(公告)号：EP2469274B1

公开(公告)日：2018-08-29

申请号：EP11194598.6

申请日：2011-12-20

申请人： NGK SPARK PLUG CO., LTD.

发明人： Kato, Kenji ,  Ito, Kouhei

IPC分类号： G01N27/419 ,  G01N27/407

CPC分类号： G01N27/419

摘要： [Objective] To provide a gas sensor which can improve the sensitivity to NO x . [Means for Solution] A reduction section 18 for reducing NO 2 contained in exhaust gas to NO is provided on the upstream side of a first diffusion resistor section 103 provided to limit the flow of the exhaust gas into a first measurement chamber 101. When NO x passes through the first diffusion resistor section 103, NO 2 which is greater in molecular weight than NO is lower in the degree of diffusion than NO. Since NO 2 is reduced to NO at the reduction section 18, the exhaust gas passing through the first diffusion resistor section 103 hardly contains NO 2 . Therefore, the speed of flow of NO x through the first diffusion resistor section 103 is not limited by NO 2 , whereby sensitivity for detection of NO x can be improved.