公开(公告)号：US10352893B2

公开(公告)日：2019-07-16

申请号：US15250143

申请日：2016-08-29

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Keisuke Nakagawa ,  Shigehiro Ohtsuka ,  Hisashi Kozuka ,  Kazuma Ito ,  Ippei Kato

IPC: G01N27/406 ,  G01N27/407

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.

公开(公告)号：US10012612B2

公开(公告)日：2018-07-03

申请号：US15207690

申请日：2016-07-12

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Shigehiro Ohtsuka ,  Tomohiro Nishi ,  Keisuke Nakagawa ,  Kazuma Ito ,  Ippei Kato

IPC: G01N27/12 ,  G01N27/30 ,  G01N27/406 ,  G01N27/407 ,  G01D11/30 ,  G01N27/419

CPC classification number: G01N27/4076 ,  G01D11/30 ,  G01N27/4073 ,  G01N27/419

Abstract: An inside lead portion of a gas sensor element has a lanthanum zirconate layer arranged between an electrically conductive oxide layer and a solid electrolyte member. Meanwhile, an inside detection electrode portion of the gas sensor element is formed such that (i) no lanthanum zirconate layer is formed between an electrically conductive oxide layer and the solid electrolyte member, or (ii) a lanthanum zirconate layer thinner than the lanthanum zirconate layer of the inside lead portion is formed between the electrically conductive oxide layer and the solid electrolyte member.

公开(公告)号：US09694387B2

公开(公告)日：2017-07-04

申请号：US14525794

申请日：2014-10-28

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Masaki Onkawa ,  Shun Sakuma ,  Toru Iwano ,  Tatsuhiko Muraoka ,  Shigehiro Ohtsuka ,  Masaki Mizutani

IPC: B05D3/02 ,  G01N27/407

CPC classification number: B05D3/0254 ,  G01N27/4077 ,  G01N27/4078

Abstract: A gas sensor element in an air/fuel ratio sensor includes an element body and a protection layer having two layers (a first layer and a second layer). The gas sensor element has at least one separation portion in the form of a space between the first layer and the second layer. The gas sensor element can temporarily accumulate, in the at least one separation portion, water which adheres to the surface of the protection layer and penetrates into the protection layer. Thus, as compared with a protection layer which is identical in thickness to the protection layer, but does not have separation portions, water adhering to the protection layer is less likely to reach the element body. Therefore, there can be restrained breakage of an end of the element body which could otherwise result from thermal shock stemming from adhesion of water.

公开(公告)号：US09753020B2

公开(公告)日：2017-09-05

申请号：US14525949

申请日：2014-10-28

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Toru Iwano ,  Masaki Onkawa ,  Tatsuhiko Muraoka ,  Shun Sakuma ,  Shigehiro Ohtsuka ,  Masaki Mizutani

IPC: G01N33/00 ,  B05D1/18 ,  B05D1/36 ,  B05D3/02 ,  G01N27/409 ,  G01N27/407

CPC classification number: G01N33/0027 ,  B05D1/18 ,  B05D1/36 ,  B05D3/0254 ,  G01N27/407 ,  G01N27/4078 ,  G01N27/409

Abstract: A gas sensor element has a protection layer smaller in heat capacity than a conventional protection layer formed by a dipping process. A gas sensor includes the gas sensor element. The gas sensor element is manufactured by a method of manufacturing. The gas sensor element includes at least one space formed between a protection layer and an element body. The space is positioned over at least one of four vertexes of a forward end of the element body at a location at which the thickness of the protection layer is likely to become small. Therefore, it is possible to restrain breakage of the vertexes of the forward end of the element body which could otherwise result from thermal shock stemming from adhesion of water. The protection layer of the gas sensor element can be reduced in thickness and thus in heat capacity as compared with a conventional protection layer.

公开(公告)号：US09476863B2

公开(公告)日：2016-10-25

申请号：US14485438

申请日：2014-09-12

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Shun Sakuma ,  Masaki Onkawa ,  Toru Iwano ,  Tatsuhiko Muraoka ,  Shigehiro Ohtsuka ,  Masaki Mizutani

IPC: G01N27/407 ,  G01N33/00 ,  G01M15/10

CPC classification number: G01N33/0036 ,  G01M15/104 ,  G01N27/4072 ,  G01N27/4077 ,  G01N33/006

Abstract: A gas sensor element comprises an elongated plate-like element including, at a forward end portion, a detecting section comprising a solid electrolyte body having an outer surface and a back surface, a detection electrode on the outer surface and a reference electrode on the back surface, and a porous layer covering the detection electrode. The coating layer includes a first protection layer entirely covering the detecting section, and a second protection layer circumferentially covering the first protection layer and extending at least from a forward end of the first protection layer to a position located rearward of the porous layer. The thickness of the first protection layer on the porous layer is larger than that of the first protection layer rearward of the porous layer. The thickness of the second protection layer rearward of the porous layer is larger than that of the second protection layer above the porous layer.

Abstract translation: 一种气体传感器元件包括细长的板状元件，其在前端部分包括检测部分，该检测部分包括具有外表面和后表面的固体电解质体，外表面上的检测电极和背面上的参考电极 表面和覆盖检测电极的多孔层。 涂层包括完全覆盖检测部分的第一保护层，以及周向覆盖第一保护层并且至少从第一保护层的前端延伸到位于多孔层后方的位置的第二保护层。 多孔层上的第一保护层的厚度大于多孔层的后方的第一保护层的厚度。 多孔层后方的第二保护层的厚度大于多孔层上方的第二保护层的厚度。