公开(公告)号：US06695964B1

公开(公告)日：2004-02-24

申请号：US09588504

申请日：2000-06-07

申请人： Masashi Ando ,  Noboru Ishida ,  Satoshi Sugaya ,  Takafumi Oshima ,  Norihiko Nadanami ,  Takaki Ootuka ,  Yoshikuni Sato ,  Tatsuo Okumura

发明人： Masashi Ando ,  Noboru Ishida ,  Satoshi Sugaya ,  Takafumi Oshima ,  Norihiko Nadanami ,  Takaki Ootuka ,  Yoshikuni Sato ,  Tatsuo Okumura

IPC分类号： G01N27407

CPC分类号： G01N27/4074

摘要： Method and sensor for measuring accurate measurement of NOx concentration in an exhaust gas containing O2,H2O, CO2 and NOx and a NOx gas concentration sensor. A first oxygen pump cell sufficiently pumps out oxygen in a measurement gas such as not to decompose NOx. A pair of electrodes is provided on an inner side and an outer side of a second measurement chamber into which the gas is introduced from a first measurement chamber via a diffusion resistance. A voltage is impressed across the paired electrodes for decomposing NOx in the second measurement chamber to dissociate oxygen which causes the current to flow in a second oxygen ion pump cell. The NOx gas concentration is measured for this current. The voltage impressed across the paired electrodes of the second oxygen ion pump cell is set so as not to dissociate H2O and CO2 present in the second measurement chamber.

摘要翻译： 用于测量含有O 2，H 2 O，CO 2和NO x以及NOx气体浓度传感器的废气中的NOx浓度的精确测量的方法和传感器。 第一氧气泵电池在测量气体中充分抽出氧气，例如不分解NOx。 一对电极设置在第二测量室的内侧和外侧，气体通过扩散阻力从第一测量室引入到该第二测量室中。 在一对电极上施加电压，用于分解第二测量室中的NOx，以解离氧，这导致电流在第二氧离子泵电池中流动。 测量该电流的NOx气体浓度。 设置在第二氧离子泵电池的成对电极上施加的电压，以使第二测量室中不存在H 2 O和CO 2。

公开(公告)号：US06214208B1

公开(公告)日：2001-04-10

申请号：US08982869

申请日：1997-12-02

申请人： Masashi Ando ,  Noboru Ishida ,  Satoshi Sugaya ,  Takafumi Oshima ,  Norihiko Nadanami ,  Takaki Ootuka ,  Yoshikuni Sato ,  Tatsuo Okumura

发明人： Masashi Ando ,  Noboru Ishida ,  Satoshi Sugaya ,  Takafumi Oshima ,  Norihiko Nadanami ,  Takaki Ootuka ,  Yoshikuni Sato ,  Tatsuo Okumura

IPC分类号： G01N27407

CPC分类号： G01N27/4074 ,  Y10T436/179228

摘要： This is a method and apparatus for accurately determining a NOx concentration of a measurement gas that contains H2O and/or CO2, without being affected by a dissociation of H2O and/or CO2. In this method and apparatus, (1) the NOx-measurement gas containing H2O and/or CO2 is introduced to travel through a heated flow channel formed by an oxygen ion conductive solid ceramic electrolyte body that electrically control amount of O2 from the flow channel, (2) while said measurement gas travels, a residual gas including NO and H2O and/or CO2 is formed from the measurement gas, (3) said residual gas is flowed to contact a catalytic electrode to which a negative polarity of a low voltage that does not dissociate H2O and/or CO2 but dissociates NO is applied, so that said electrode dissociates a NO gas of the residual gas into N ions and O ions and flows an electric current through the electrolyte body in proportion to an amount of the O ions dissociated from said residual gas at the electrode, and (4) the NOx concentration in the measurement gas is determined based on the current. The low voltage preferably applied in the above (3) is about 350-450 mV.

摘要翻译： 这是一种用于精确地测定含有H 2 O和/或CO 2的测量气体的NOx浓度而不受H 2 O和/或CO 2离解影响的方法和装置。在该方法和装置中，（1）NOx测量 引入含有H 2 O和/或CO 2的气体通过由氧离子导电固体陶瓷电解质体形成的加热流动通道，该氧气离子传导性固体陶瓷电解质体从流动通道电气控制O2的量，（2）当所述测量气体行进时，残留气体包括 从测量气体形成NO和H 2 O和/或CO 2，（3）所述残留气体流动以接触催化电极，在该催化电极处施加不分离H 2 O和/或CO 2但解离NO的低电压的负极性 使得所述电极将残留气体的NO气体分解为N离子和O离子，并且与电极处的所述残留气体分离的O离子的量成比例地流过电解质体，并且（ 4）测定气体中的NOx浓度基于电流来确定。上述（3）中优选施加的低电压为约350〜450mV。