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:
Apr. 13, 2004
Filed:
May. 31, 2002
Denso Corporation, Kariya, JP;
Abstract
A heater control apparatus used for a gas concentration sensor heats a sensor element including a solid electrolyte body up to a desired activation temperature. The heater control apparatus determines an actual resistance value of the sensor element, controls a power supply to the heater as a function of a difference between the actual resistance value and a target one, determines a power supplied to the heater, and determines a reference resistance value of the sensor element based on a predetermined fundamental relation between a power used in the heater and a resistance value of the sensor element to correct the target resistance value as a function of a difference between the reference resistance value and the actual resistance value.