Gas sensor

Details Gas sensor Gas sensor

1998-06-17

2000-05-09

Warden, Sr., Robert J.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204401, 204408, 204426, G01N 2726

Patent

active

060599472

ABSTRACT:
A gas sensor comprises a main pumping cell for pumping-processing oxygen contained in a first chamber, a feedback control system for comparing a partial pressure of oxygen in the first chamber with a first reference value to control the main pumping cell so that the partial pressure of oxygen has a predetermined value at which NO is not decomposable, an auxiliary pumping cell for pumping-processing oxygen in the second chamber, and a measuring pumping cell for pumping-processing oxygen produced by decomposition of NOx. The gas sensor further comprises a correcting control system for correcting and controlling the feedback control system on the basis of a difference between a second reference value and a value of a pumping current flowing through the auxiliary pumping cell to give a constant oxygen concentration in the second chamber, and a self-diagnosis unit for comparing the value of the pumping current with a prescribed range and judging whether or not any trouble occurs, on the basis of an obtained result of comparison. Accordingly, it is possible to provide the gas sensor having a self-diagnosis function capable of quickly and reliably detecting whether or not any trouble occurs.

REFERENCES:
patent: 4824549 (1989-04-01), Hamada et al.
patent: 4905652 (1990-03-01), Nakajima et al.
patent: 4981125 (1991-01-01), Kato et al.

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