Oxygen concentration sensing apparatus
    4.
    发明授权
    Oxygen concentration sensing apparatus 失效
    氧气浓度检测装置

    公开(公告)号:US4818362A

    公开(公告)日:1989-04-04

    申请号:US27893

    申请日:1987-03-19

    IPC分类号: G01N27/406 G01N27/58

    CPC分类号: G01N27/4065

    摘要: An apparatus for sensing the concentration of oxygen in a gas such as engine exhaust gas includes an oxygen concentration sensor formed of an oxygen pump element and a sensor cell element, each based on a solid electrolytic member formed of a material such as ZrO.sub.2, and is provided with a limiter circuit which functions to reduce the level of current supplied to the oxygen pump element when a voltage produced by the sensor cell element indicates that this current level is such as to produce a "blackening" phenomenon whereby deterioration of the oxygen pump element will occur and oxygen concentration sensing reliability will be lowered. The apparatus also includes a delay circuit which functions such that a reduction of the oxygen pump element current level is delayed by a predetermined time interval, after an increase of the sensor cell element voltage to the "blanking" region is detected, thereby preventing fluctuations in the oxygen pump element current level due to transient increases in sensor cell element voltage and increasing the sensing reliability.

    摘要翻译: 用于检测诸如发动机废气的气体中的氧浓度的装置包括由氧泵元件和传感器电池元件形成的氧浓度传感器,每个氧浓度传感器基于由诸如ZrO 2的材料形成的固体电解部件,并且是 设置有限制电路,其功能是当由传感器电池元件产生的电压指示该电流水平产生“变黑”现象时,降低供应给氧泵元件的电流电平,从而使氧泵元件的劣化 会发生氧浓度检测的可靠性降低。 该装置还包括延迟电路,其功能是使得在检测到“消隐”区域的传感器单元元件电压增加之后,将氧气泵元件电流水平的减小延迟预定时间间隔,从而防止波动 氧泵元件电流水平由于传感器单元电压的瞬态增加而增加了传感器的可靠性。

    Oxygen concentration sensing apparatus
    5.
    发明授权
    Oxygen concentration sensing apparatus 失效
    氧气浓度检测装置

    公开(公告)号:US4762604A

    公开(公告)日:1988-08-09

    申请号:US28113

    申请日:1987-03-19

    CPC分类号: G01N27/417 G01N27/4065

    摘要: An oxygen concentration sensing apparatus includes an oxygen pump element and a sensor cell element with a pair of electrodes respectively, being disposed to face each other, to form a restricted region between them, and a current source for supplying a pump current across the electrodes the oxygen pump element. A limit voltage is adjustably set in response to a voltage across the electrodes of the oxygen pump element, and the pump current supplied to the oxygen pump element is reduced when a voltage generated across the electrodes of the sensor cell element has exceeded the limit voltage.

    摘要翻译: 氧浓度检测装置包括氧泵元件和分别具有一对电极的传感器电池元件,被设置为彼此面对以在它们之间形成受限区域,以及用于在电极之间提供泵浦电流的电流源 氧气泵元件。 响应于氧泵元件的电极两端的电压可调节地设定极限电压,并且当传感器电池元件两端的电压产生的电压超过极限电压时,提供给氧泵元件的泵电流降低。