Oxygen sensor and an air-fuel ratio control apparatus of an internal
combustion engine using the same
    2.
    发明授权
    Oxygen sensor and an air-fuel ratio control apparatus of an internal combustion engine using the same 失效
    氧传感器和使用其的内燃机的空燃比控制装置

    公开(公告)号:US4834051A

    公开(公告)日:1989-05-30

    申请号:US166968

    申请日:1988-03-11

    摘要: An oxygen sensor having a detecting element for detecting the concentration of oxygen contained in a subject gas. The subject gas reaches the detecting element through a carrier carrying a substance which adsorbs or desorbs the oxygen in the subject gas in accordance with the partial pressure of the oxygen. Thus, the detecting element is prevented from being corrupted by O.sub.2 or CO. Even though the oxygen sensor is temporarily exposed to excessive O.sub.2 or CO, therefore, the responsiveness of oxygen concentration detection to be effected thereafter is improved. Cerium oxide or lanthanum oxide may be suitably used as the oxygen adsorbing or desorbing material. The carrier may be pellets surrounding the oxygen detecting element, or a protective layer or a buffer layer formed on the surface of the detecting element. Alternatively, the carrier may be formed independently of the oxygen sensor so as to be disposed in an exhaust passage on the upper-course side of the oxygen sensor. The oxygen sensor of the present invention is adapted for use in an air-fuel ratio control apparatus of an internal combustion engine.

    摘要翻译: 具有用于检测被检体气体中所含的氧浓度的检测元件的氧传感器。 目标气体通过携带物质的载体到达检测元件,所述物质根据氧气的分压吸附或解吸当前气体中的氧气。 因此,可以防止检测元件被O2或CO破坏,即使氧气传感器暂时暴露于过量的O 2或CO,因此提高了其后进行的氧浓度检测的响应性。 氧化铈或氧化镧可以适当地用作氧吸附或解吸材料。 载体可以是围绕氧检测元件的颗粒,或形成在检测元件的表面上的保护层或缓冲层。 或者,载体可以独立于氧传感器形成,以便设置在氧传感器的上游侧的排气通道中。 本发明的氧传感器适用于内燃机的空燃比控制装置。