Chemistry: electrical and wave energy – Processes and products
Patent
1979-04-10
1980-09-23
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204195S, G01N 2758
Patent
active
042241138
ABSTRACT:
A method of detecting numerical values for air/fuel ratio of either a lean air-fuel mixture or a rich mixture supplied to, for example, a combustion engine by means of an oxygen sensor disposed in the exhaust gas. The sensor comprises a porous measurement electrode layer on one side of a porous solid electrolyte layer, e.g., of zirconia and a porous reference electrode layer on the other side with a shield layer thereon, so that the reference electrode layer communicates with the exhaust gas through pores in the sensor. Measurement is accomplished by keeping a DC current flowing between the two electrode layers to establish a reference oxygen partial pressure on the reference electrode side. The intensity of the current is made below a critical value above which an EMF generated by the sensor becomes substantially constant unless the air/fuel ratio changes across the stoichiometric ratio, and the direction of the current flow is chosen depending on whether the air-fuel mixture is a lean one or a rich one.
REFERENCES:
patent: 4107019 (1978-08-01), Takao et al.
David S. Howarth et al., SAE 780212, (1978).
G. L. Beaudoin et al., SAE 760312, (1976).
Aoki Hiroyuki
Ikezawa Kenji
Ishitani Shigeo
Kimura Shinji
Takao Hiroshi
Kaplan G. L.
Nissan Motor Company Limited
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