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    Method and sensor for measuring NOx concentration
    3.
    发明公开
    Method and sensor for measuring NOx concentration 有权
    用于测量的NOx的浓度的方法和传感器

    公开(公告)号：EP0930501A3

    公开(公告)日：2002-04-24

    申请号：EP99101007.5

    申请日：1999-01-18

    Applicant: NGK Spark Plug Co. Ltd.

    Inventor： Yamada, Tessho ,  Ishida, Noboru ,  Matsuura, Toshitaka ,  Noda, Yoshiro ,  Hayakawa, Nobuhiro ,  Nadanami, Norihiko ,  Sugaya, Satoshi ,  Otsuka, Takaki ,  Ando, Masashi ,  Oshima, Takafumi

    IPC: G01N27/417 ,  G01N27/419

    CPC classification number: G01N27/417

    Abstract: The invention relates to an apparatus and a method using a two-serial space sensor (having first and second internal spaces (2, 3)) for accurately measuring NOx concentration in gas, e.g., exhausted from an internal combustion engine. Both NOx (nitrogen oxide) and oxygen are forced to be partially dissociated in the first space (2) to an oxygen concentration level of 2 x 10 -7 to 2 x 10 -10 atm by pumping out oxygen from the first space (2). The NOx concentration is determined based on the second current measured in the second space (4) and based on the NO dissociation percentage in the first space (2) which is 0.5-50%, or preferably 2-20%. The NOx measurement accuracy is further improved when the above oxygen concentration level is maintained from 2 x 10 -8 to 2 x 10 -9 and the temperature drift of the sensor is maintained within ± 5°C under a sensor temperature range of 700-900 °C.

    Method and apparatus for measuring NOx gas concentration
    4.
    发明公开
    Method and apparatus for measuring NOx gas concentration 失效
    的方法和装置的氮氧化物的测量

    公开(公告)号：EP0845670A3

    公开(公告)日：1998-10-07

    申请号：EP97121139.6

    申请日：1997-12-02

    Applicant: NGK SPARK PLUG CO., LTD

    Inventor： Ando, Masashi ,  Ishida, Noboru ,  Sugaya, Satoshi ,  Oshima, Takafumi ,  Nadanami, Norihiko ,  Otsuka, Takaki ,  Sato, Yoshikuni ,  Okumura, Tatuo

    IPC: G01N27/407

    CPC classification number: G01N27/4074 ,  Y10T436/179228

    Abstract: This discloses a method and apparatus for accurately determining a NOx concentration of a measurement gas that contains H 2 O and /or CO 2, without being affected by a dissociation of H 2 O and /or CO 2.
    In this method and apparatus,
    (1) the NOx-measurement gas containing H 2 O and/or CO 2 is introduced to travel through a heated flow channel formed by an oxygen ion conductive solid ceramic electrolyte body that electrically controls amount of O 2 from the flow channel, (2) while said measurement gas travels, a residual gas including NO and H 2 O and/or CO 2 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 H 2 O and /Or CO 2 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.

    Method and sensor for measuring NOx concentration
    7.
    发明公开
    Method and sensor for measuring NOx concentration 有权
    Verfahren zur Konzentrationsmessung von NOx

    公开(公告)号：EP0930501A2

    公开(公告)日：1999-07-21

    申请号：EP99101007.5

    申请日：1999-01-18

    Applicant: NGK Spark Plug Co. Ltd.

    Inventor： Yamada, Tessho ,  Ishida, Noboru ,  Matsuura, Toshitaka ,  Noda, Yoshiro ,  Hayakawa, Nobuhiro ,  Nadanami, Norihiko ,  Sugaya, Satoshi ,  Otsuka, Takaki ,  Ando, Masashi ,  Oshima, Takafumi

    IPC: G01N27/417

    CPC classification number: G01N27/417

    Abstract: The invention relates to an apparatus and a method using a two-serial space sensor (having first and second internal spaces (2, 3)) for accurately measuring NOx concentration in gas, e.g., exhausted from an internal combustion engine. Both NOx (nitrogen oxide) and oxygen are forced to be partially dissociated in the first space (2) to an oxygen concentration level of 2 x 10 -7 to 2 x 10 -10 atm by pumping out oxygen from the first space (2). The NOx concentration is determined based on the second current measured in the second space (4) and based on the NO dissociation percentage in the first space (2) which is 0.5-50%, or preferably 2-20%. The NOx measurement accuracy is further improved when the above oxygen concentration level is maintained from 2 x 10 -8 to 2 x 10 -9 and the temperature drift of the sensor is maintained within ± 5°C under a sensor temperature range of 700-900 °C.

    Abstract translation: 本发明涉及一种使用双串行空间传感器（具有第一和第二内部空间（2,3））的装置和方法，用于精确地测量例如从内燃机排出的气体中的NOx浓度。 在第一空间（2）中，NOx（氮氧化物）和氧被强制部分解离，氧浓度水平为2×10 -7至2×10 -10 atm，通过从第一空间 空间（2）。 基于在第二空间（4）中测量的第二电流，并且基于第一空间（2）中的NO解离百分比为0.5-50％，或优选2-20％来确定NOx浓度。 当上述氧浓度水平维持在2×10 -8至2×10 -9时，NOx传感器的测量精度进一步提高，传感器的温度漂移保持在+/- 5℃以下 温度范围700-900℃

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