Oxygen sensor and an air-fuel ratio control apparatus of an inte

Details Oxygen sensor and an air-fuel ratio control apparatus of an inte Oxygen sensor and an air-fuel ratio control apparatus of an inte

1988-03-11

1989-05-30

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, 204426, 204429, F02D 4114, G01N 2746

Patent

active

048340510

ABSTRACT:
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.

REFERENCES:
patent: 4132615 (1979-01-01), Linder et al.
patent: 4569748 (1986-02-01), Yamakawa et al.
patent: 4574042 (1986-03-01), Shiraishi
patent: 4584086 (1986-04-01), Hayakawa et al.
patent: 4626338 (1986-12-01), Kondo et al.
patent: 4741817 (1988-03-01), Croset et al.
patent: 4773376 (1988-09-01), Uchikawa et al.

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