Method and apparatus for controlling the energizing of a heater

Details Method and apparatus for controlling the energizing of a heater Method and apparatus for controlling the energizing of a heater

1996-04-23

1997-12-23

Tung, T.

Electrolysis: processes, compositions used therein, and methods

Electrolytic analysis or testing

For oxygen or oxygen containing compound

204408, 204425, 204426, 204427, 2057845, G01N 27409

Patent

active

057003670

ABSTRACT:
An oxygen sensor according to the present invention has battery element and a pump element in each of which porous electrodes are disposed on both faces of a solid electrolyte substrate. A minute current is supplied to the battery element after the start of energizing a heater and the activation of the sensor elements are judged on the basis of an interelectrode voltage generated at this energizing. A heater voltage is set to be 12V at the start of energizing. When the time period necessary for the interelectrode voltage to reach a predetermined voltage is short, the applied voltage is lowered to 11V. As a result, the time period necessary for judging the sensor elements to be activated can be made substantially constant irrespective of variations in sensor characteristics. After the activation judgment, the variation of the temperature of the sensor element is monitored on the basis of the interelectrode voltage. When the element temperature is varied, the heater voltage is raised or lowered so that the element temperature is stabilized.

REFERENCES:
patent: 4359030 (1982-11-01), Sone et al.
patent: 4694809 (1987-09-01), Nakano et al.
Patent Abstracts Of Japan, vol. 9, No. 199 (P-380), Aug. 16, 1985, JP-A-60 063455 (Toyota Jidosha KK), Apr. 11, 1985, *abstract.
Patent Abstracts Of Japan, vol. 0, No. 00 JP-A-06 324017 (Matsushita Electric Ind Co), Nov. 25, 1994, *abstract.

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