Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1980-07-25
1981-12-22
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
G01N 2758
Patent
active
043069576
ABSTRACT:
A device comprising an oxygen-sensitive element to be disposed in a combustion gas exhausted from a combustor to detect deviation of actual air/fuel ratio from a stoichiometric ratio. The element is a combination of two oxygen concentration cells each having a solid electrolyte layer, a measurement electrode layer formed on one side of the electrolyte layer, a reference electrode layer formed on the opposite side and covered with a shield layer. Either measurement electrode layers or reference electrode layers of the two cells are connected to each other, and a constant DC voltage is applied to the element to force a current to flow through solid electrolyte layers of both cells to cause migration of oxygen ions therethrough, from the measurement electrode to the reference electrode in one cell and reversely in the other. The device has a circuit to make a comparison between a fixed reference voltage and an output voltage developed between the measurement and reference electrodes of one cell of the element to produce a high-or-low level control signal according to the result of the comparison. The output voltage is independent of the internal resistance of the element and is scarcely affected by the temperature of the element.
REFERENCES:
patent: 3915830 (1975-10-01), Isenberg
patent: 4107019 (1978-08-01), Takao et al.
patent: 4126532 (1978-11-01), Takao et al.
patent: 4207159 (1980-06-01), Kimura et al.
patent: 4224113 (1980-09-01), Kimura et al.
Ishitani Shigeo
Kimura Shinji
Takao Hiroshi
Uchida Masaaki
Kaplan G. L.
Nissan Motor Co,. Ltd.
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