Gas sensor control apparatus

Patent metadata

Field	Value
Publication number	US-10352893-B2
Application number	US-201615250143-A
Country	US
Kind code	B2
Filing date	Aug 29, 2016
Priority date	Aug 31, 2015
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

A gas sensor control apparatus including a gas sensor element, a heater for heating the gas sensor element, and heater energization control means for feedback controlling the supply of electric current to the heater such that the internal resistance of the gas sensor element coincides with a target resistance. The gas sensor element has a solid electrolyte member and an electrode portion including an outside electrode and an inside electrode. At least a portion of the electrode portion is formed of an electrically conductive oxide whose main component is (i) a first perovskite phase which is represented by a composition formula of LaCo1−xNixO3±d (0.300≤x≤0.600, 0≤d≤0.4) and has a perovskite-type crystal structure, or (ii) a second perovskite phase which is represented by a composition formula of LaFe1−yNiyO3±d (0.450≤y≤0.700, 0≤d≤0.4) and has a perovskite-type crystal structure.

First claim

What is claimed is:

1. A gas sensor control apparatus comprising:
a gas sensor element which includes a solid electrolyte member and an electrode portion, the electrode portion including an outside electrode which is provided on an outer surface of the solid electrolyte member and which comes into contact with a gas under measurement, and an inside electrode which is provided on an inner surface of the solid electrolyte member and which comes into contact with a reference gas;
a heater for heating the gas sensor element; and
heater energization control means for feedback controlling energization of the heater such that an internal resistance of the gas sensor element coincides with a target resistance,
wherein at least a portion of the electrode portion is formed of an electrically conductive oxide whose main component is

(i) a perovskite phase which is represented by a composition formula of LaCo 1−x Ni x O 3±d (0.55≤x≤0.600, 0≤d≤0.4) and has a perovskite-type crystal structure, or
(ii) a perovskite phase which is represented by a composition formula of LaFe 1−y Ni y O 3±d (0.55≤y≤0.700, 0≤d≤0.4) and has a perovskite-type crystal structure, and
wherein
the outside electrode includes an outside lead portion and an outside detection electrode portion which comes into contact with the gas under measurement;
the outside detection electrode portion is formed of a noble metal; and
the outside lead portion is formed of the electrically conductive oxide.

2. The gas sensor control apparatus as claimed in claim 1 , wherein
in the composition formula of LaFe 1−y Ni y O 3±d (0.650≤y≤0.700).

Assignees

• Ngk Spark Plug Co

Inventors

• Nakagawa Keisuke
• Ohtsuka Shigehiro
• Kozuka Hisashi
• Ito Kazuma
• Kato Ippei

Classifications

• G01N27/4067 Primary

  Means for heating or controlling the temperature of the solid electrolyte · CPC title

• G01N27/4075

  Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts · CPC title

• G01N27/4071

  using sensor elements of laminated structure · CPC title