Air-fuel ratio sensor

Details Air-fuel ratio sensor Air-fuel ratio sensor

1987-12-28

1989-06-06

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204412, 204425, G01N 2758

Patent

active

048369063

ABSTRACT:
An air-fuel ratio sensor in which the temperature dependence as well as the pressure dependence of a detection signal obtained by the air-fuel ratio sensor are suppressed to thereby improve the accuracy in air-fuel ratio by the air-fuel ratio sensor, which is not influenced by deposits in an exhaust gas and which is high in durability. The suppression is achieved by using a gas-diffusion limiting portion having such critical parameters as 10-30% porosity, 1-3 micrometers mean pore size and 200-1000 micrometers thickness. Alternatively the parameters may be 15-25% porosity, 0.1-7 micrometers pore size and 400-800 micrometers thickness.

REFERENCES:
patent: 4021326 (1977-05-01), Pollner et al.
patent: 4151060 (1979-04-01), Isenberg
patent: 4240890 (1980-12-01), Watanabe et al.
patent: 4402820 (1983-09-01), Sano et al.
patent: 4476008 (1984-10-01), Sano et al.
patent: 4713166 (1987-12-01), Kojima et al.
patent: 4722779 (1988-02-01), Yamada et al.

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