The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 07, 1984
Filed:
Jun. 08, 1982
Masaaki Uchida, Yokosuka, JP;
Shigeo Isitani, Yokosuka, JP;
Nissan Motor Company, Limited, Yokohama, JP;
Abstract
A device for detecting concentrations of oxygen in gases by using an oxygen sensor element having a substrate provided with a heater and a concentration cell part in the form of a laminate including a solid electrolyte layer supported on the substrate. The device has a power supply circuit to apply a controlled voltage to the heater to keep it at a constant temperature by controlling its resistance to a constant value, and a current supply circuit which forces a controlled DC current to flow through the solid electrolyte layer in the sensor element to thereby maintain a reference oxygen partial pressure in the sensor element. The current supply circuit is electrically associated with the power supply circuit so as to vary the intensity of the current in inverse proportion to the voltage applied to the heater for the purpose of maintaining the reference oxygen partial presure constant even when the temperature of the concentration cell part of the sensor element varies depending on the temperature of the gas subject to measurement.