利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

16 条记录 (耗时 0.019 秒)

    NOx sensor
    4.
    发明公开
    NOx sensor 失效
    NOx传感器

    公开(公告)号：EP0869356A2

    公开(公告)日：1998-10-07

    申请号：EP98105804.3

    申请日：1998-03-30

    申请人： NGK Spark Plug Co. Ltd.

    发明人： Miyata, Shigeru ,  Ando, Masashi ,  Inagaki, Hiroshi ,  Ishida, Noboru ,  Oshima, Takafumi

    IPC分类号： G01N27/407

    CPC分类号： G01N27/417 ,  G01N27/4074

    摘要： An NO x sensor capable of accurately determining the concentration of NO x contained in a gas to be analyzed (measurement gas) using a simple circuit. The NO x sensor includes a first measurement space (20) and a second measurement space (26). The first measurement space (20) communicates with the measurement gas via a first diffusion controlling layer (4d), and the second measurement space (26) communicates with the first measurement space via a second diffusion controlling layer (6d). A first pumping current I p1 is controlled such that an output from a Vs cell is used as a reference voltage V co to control the amount of oxygen flowing into the second measurement space (26) at a constant level. A constant voltage is applied to the second pumping cell (8) so as to decompose the NO x component of the measurement gas contained in the second measurement space (26), and to pump out the resulting oxygen from the second measurement space (26). Accordingly, the concentration of NO x contained in the measurement gas can be obtained from second pumping current I p2 . The electrode of the Vs cell located on the side of the first measurement space (20) is formed around the periphery of or on a portion of the diffusion controlling layer (6d) of the Vs cell. As a result, the amount of oxygen flowing from the first measurement space (20) into the second measurement space (26) can be accurately determined by means of the Vs cell. Also, the NO x concentration can be accurately determined without the need for compensation.

    摘要翻译： 一种能够使用简单电路精确地确定待分析气体（测量气体）中所含的NOx的浓度的NOx传感器。 NOx传感器包括第一测量空间（20）和第二测量空间（26）。 第一测量空间（20）经由第一扩散控制层（4d）与测量气体连通，第二测量空间（26）经由第二扩散控制层（6d）与第一测量空间连通。 控制第一泵浦电流Ip1使得将来自Vs电池的输出用作参考电压Vco，以将恒定水平的第二测量空间（26）的氧气量控制在一起。 将恒定电压施加到第二泵浦电池（8），以分解包含在第二测量空间（26）中的测量气体的NOx成分，并从第二测量空间（26）泵出所得到的氧气。 因此，可以从第二泵浦电流Ip2获得包含在测量气体中的NOx的浓度。 位于第一测量空间（20）一侧的Vs单元的电极形成在Vs单元的扩散控制层（6d）的一部分周围或周围。 结果，可以通过Vs单元精确地确定从第一测量空间（20）流入第二测量空间（26）的氧气量。 此外，可以精确地确定NOx浓度，而不需要补偿。

    Method and sensor for measuring NOx concentration
    6.
    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

    申请人： NGK Spark Plug Co. Ltd.

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

    IPC分类号： G01N27/417 ,  G01N27/419

    CPC分类号： G01N27/417

    摘要： 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
    7.
    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

    申请人： NGK SPARK PLUG CO., LTD

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

    IPC分类号： G01N27/407

    CPC分类号： G01N27/4074 ,  Y10T436/179228

    摘要： 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.