Exhaust gas sensor and system thereof
    2.
    发明公开
    Exhaust gas sensor and system thereof 失效
    和排气传感器系统中使用此传感器

    公开(公告)号:EP0851225A3

    公开(公告)日:2000-05-24

    申请号:EP97122863.0

    申请日:1997-12-24

    IPC分类号: G01N27/407 G01N27/417

    摘要: The present invention provides an apparatus for measuring the concentration of a constituent to be detected in exhaust gas, which apparatus is capable of detecting with a high accuracy the concentration of the constituent to be detected in exhaust gas even though oxygen concentration in the exhaust gas varies. In an exhaust gas sensor 1 for use in the measuring apparatus, exhaust gas is introduced into spaces 15, 16 on both sides of an oxygen concentration cell element 4, and the oxidation catalyst activities of first to third electrodes 11 to 13 are adjusted so that there occurs a difference between the space 15 and the space 16 in the consumption of the constituent to be detected, which consumption is caused by the oxidation of the constituent. Thus a concentration cell electromotive force is generated in the oxygen concentration cell element 4, and an oxygen pump element 3 pumps oxygen into or out of the space 15 so that the electromotive force is held at an target value EC not more than 10 mV. The pump current at this time is taken as the detection output on the constituent to be detected. The strengths of the oxygen concentration cell element 4 and of the oxygen pump element 3 can be increased by the provision of an integrated sintered body in which the elements 4 and 3 are laminated together with the space 15 formed between the first electrode 11 and the second electrode 12. Besides, the accuracy of detecting the constituent to be detected can be improved by the control over the temperature of the oxygen concentration cell element 4 and by the temperature compensation to the pump current.

    Exhaust gas sensor and system thereof
    3.
    发明公开
    Exhaust gas sensor and system thereof 失效
    Abgassensorsystem

    公开(公告)号:EP0851225A2

    公开(公告)日:1998-07-01

    申请号:EP97122863.0

    申请日:1997-12-24

    IPC分类号: G01N27/407

    摘要: The present invention provides an apparatus for measuring the concentration of a constituent to be detected in exhaust gas, which apparatus is capable of detecting with a high accuracy the concentration of the constituent to be detected in exhaust gas even though oxygen concentration in the exhaust gas varies. In an exhaust gas sensor 1 for use in the measuring apparatus, exhaust gas is introduced into spaces 15, 16 on both sides of an oxygen concentration cell element 4, and the oxidation catalyst activities of first to third electrodes 11 to 13 are adjusted so that there occurs a difference between the space 15 and the space 16 in the consumption of the constituent to be detected, which consumption is caused by the oxidation of the constituent. Thus a concentration cell electromotive force is generated in the oxygen concentration cell element 4, and an oxygen pump element 3 pumps oxygen into or out of the space 15 so that the electromotive force is held at an target value EC not more than 10 mV. The pump current at this time is taken as the detection output on the constituent to be detected. The strengths of the oxygen concentration cell element 4 and of the oxygen pump element 3 can be increased by the provision of an integrated sintered body in which the elements 4 and 3 are laminated together with the space 15 formed between the first electrode 11 and the second electrode 12. Besides, the accuracy of detecting the constituent to be detected can be improved by the control over the temperature of the oxygen concentration cell element 4 and by the temperature compensation to the pump current.

    摘要翻译: 本发明提供了一种用于测量废气中待检测成分的浓度的装置,即使废气中的氧浓度变化,该装置能够高精度地检测废气中待检测的成分的浓度 。 在测定装置中使用的废气传感器1中,将废气引入到氧浓度电池元件4的两侧的空间15,16中,调整第一〜第三电极11〜13的氧化催化剂活性,使得 在消耗被检测成分的空间15和空间16之间存在差异,该消耗是由成分的氧化引起的。 因此,在氧浓度电池元件4中产生浓度电池电动势,并且氧气泵元件3将氧气输入或输出空间15,使得电动势保持在不大于10mV的目标值EC。 此时的泵电流被作为要检测的成分的检测输出。 氧浓度电池元件4和氧气泵元件3的强度可以通过提供一体的烧结体来提高,其中元件4和3被层压在一起,并且形成在第一电极11和第二电极11之间的空间15 电极12.此外,通过对氧浓缩电池元件4的温度的控制以及对泵电流的温度补偿,可以提高检测成分的检测精度。