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    • 7. 发明授权
    • Oxygen concentration sensing apparatus
    • 氧气浓度检测装置
    • US4818362A
    • 1989-04-04
    • US27893
    • 1987-03-19
    • Masahiko AsakuraTomohiko KawanabeMinoru MuroyaShin'ichi KubotaKatsuhiko KimuraYasunari SekiKouji Matsuura
    • Masahiko AsakuraTomohiko KawanabeMinoru MuroyaShin'ichi KubotaKatsuhiko KimuraYasunari SekiKouji Matsuura
    • G01N27/406G01N27/58
    • G01N27/4065
    • 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.
    • 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。