公开(公告)号：US11879864B2

公开(公告)日：2024-01-23

申请号：US17113432

申请日：2020-12-07

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke Watanabe ,  Shotaro Niizuma ,  Hayami Aota ,  Toshihiro Hirakawa

IPC: G01N27/406 ,  H01R11/11 ,  H01R13/20 ,  H01R4/08 ,  G01N27/409

CPC classification number: G01N27/4062 ,  G01N27/409 ,  H01R4/08 ,  H01R11/11 ,  H01R13/20

Abstract: A metal terminal includes an element contacting portion which is disposed at one end of the metal terminal and is placed in contact with a sensor element, a lead wire retaining member which is disposed at another end of the metal terminal, and crimps and retains lead wires, a positioning member disposed between the one end and the other end and extending in a direction intersecting one direction, the positioning member positioning the metal terminal on a ceramic housing, and a guide member provided integrally with the positioning member at a site between the positioning member and the lead wire retaining member.

公开(公告)号：US11604161B2

公开(公告)日：2023-03-14

申请号：US17093676

申请日：2020-11-10

Applicant: NGK INSULATORS, LTD.

Inventor： Shotaro Niizuma ,  Yusuke Watanabe ,  Toshihiro Hirakawa ,  Hayami Aota

IPC: G01N27/407 ,  G01N27/406 ,  G01N33/00 ,  G01N27/41 ,  G01N27/409

Abstract: A gas sensor includes a sensor element, an elastic insulating member, a plurality of lead wires, a plurality of metal terminals, and a ceramic housing. The plurality of lead wires are inserted in the elastic insulating member. The plurality of metal terminals each have a first end electrically connected to the sensor element, and a second end electrically connected to a corresponding one of the plurality of lead wires. The ceramic housing includes a plurality of insertion portions each including a through hole in which a corresponding one of the plurality of metal terminals is inserted, and at least one of the plurality of insertion portions has a different height from other insertion portions.

公开(公告)号：US11506628B2

公开(公告)日：2022-11-22

申请号：US16996032

申请日：2020-08-18

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke Watanabe ,  Shiho Iwai

IPC: G01N27/407 ,  G01N27/41 ,  G01N33/00

Abstract: In a sensor element for a limiting-current type gas sensor measuring concentration of NOx in a measurement gas, an inner pump electrode located to face a first internal space communicating, under predetermined diffusion resistance, with a gas inlet through which a measurement gas is introduced from an external space is made of a cermet of a Pt—Au alloy and zirconia, and includes a first portion located on a surface farther from a heater part and a second portion located on a surface closer to the heater part from among surfaces opposing each other in the first internal space, an Au content with respect to the Pt—Au alloy as a whole of the second portion is 0.3 wt % or more smaller than that of the first portion, and a total area of the first portion and the second portion is 10 mm2 to 25 mm2.

公开(公告)号：US11385197B2

公开(公告)日：2022-07-12

申请号：US16551765

申请日：2019-08-27

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke Watanabe ,  Mika Kai ,  Tomoya Seimori ,  Takashi Hino

IPC: G01N27/407 ,  F02D41/14 ,  G01N27/419 ,  G01N27/409

Abstract: A sensor element includes: an element base including: a ceramic body made of an oxygen-ion conductive solid electrolyte, and having a gas inlet at one end portion thereof; at least one internal chamber located inside the ceramic body, and communicating with the gas inlet under predetermined diffusion resistance; an electrochemical pump cell including an electrode located on an outer surface of the ceramic body, an electrode facing the chamber, and a solid electrolyte located therebetween; and a heater buried in the ceramic body, and an leading-end protective layer being porous, and covering a leading end surface and four side surfaces in a predetermined range of the element base on the one end portion. The leading-end protective layer has an extension extending into the gas inlet, and fixed to an inner wall surface of the ceramic body demarcating the gas inlet.

公开(公告)号：US11268929B2

公开(公告)日：2022-03-08

申请号：US15938233

申请日：2018-03-28

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke Watanabe

IPC: G01N27/41 ,  G01N27/406 ,  G01N27/407

Abstract: A sensor element includes a porous reference gas introduction layer for introducing a reference gas as a reference for detecting a specific gas concentration of a measurement-object gas from an entrance and allowing the reference gas to flow to a reference electrode disposed at the back, wherein the reference gas introduction layer is divided by a partition position defined to be in the range of 50 to 95% of the full length of the reference gas introduction layer from the entrance toward the inside, into a back side portion and an entrance side portion, the reference electrode is accommodated in the back side portion, and the diffusion resistance Rb of the entrance side portion is higher than the diffusion resistance Ra of the back side portion.

公开(公告)号：US11067530B2

公开(公告)日：2021-07-20

申请号：US16734620

申请日：2020-01-06

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke Watanabe ,  Takayuki Sekiya

IPC: G01N27/407 ,  G01N27/419

Abstract: A method of operation of a gas sensor includes applying a control voltage that is set between the reference electrode and the measurement-object gas side electrode; and detecting the specific gas concentration in the measurement-object gas on the basis of a voltage between the reference electrode and the measurement electrode during a second period, from among a first period that is started upon setting of the control voltage to on state, during which a potential difference between the reference electrode and the measurement-object gas side electrode is large, and the second period that is started upon setting of the control voltage to off state after the potential difference falls from the first period. Tf, a fall time of the potential difference between the first period and the second period, and T2, a second time that is a length of the second period, satisfies Tf≤T2.

公开(公告)号：US10514349B2

公开(公告)日：2019-12-24

申请号：US15248160

申请日：2016-08-26

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke Watanabe ,  Takao Murase ,  Masashi Yasui

IPC: G01N27/00 ,  G01N27/02 ,  G01N33/00 ,  G01N27/407

Abstract: A gas sensor 10 includes a tubular protective cover 30 having an element chamber 37 therein and configured to allow a measured gas to flow from the outside into the element chamber 37; and a long sensor element 20 including a detecting portion 23 located in the element chamber 37 and configured to detect a specified gas concentration in the measured gas. An inclination angle θt of an axial direction of the sensor element 20 (i.e., a direction parallel to an element axis A1) in the element chamber 37 with respect to an axial direction of the protective cover 30 (i.e., a direction parallel to a cover axis A2) is 1° or greater.

公开(公告)号：US11899002B2

公开(公告)日：2024-02-13

申请号：US17208060

申请日：2021-03-22

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke Watanabe ,  Takayuki Sekiya

IPC: G01N33/00 ,  G01N27/419 ,  G01N27/41 ,  G01N27/407 ,  G01N27/409

CPC classification number: G01N33/0037 ,  G01N27/409 ,  G01N27/4073 ,  G01N27/41 ,  G01N27/419

Abstract: A limiting-current type gas sensor including a sensor element including a base part made of an oxygen-ion conductive solid electrolyte and measuring concentration of NOx in a measurement gas includes: a pump cell including a first electrode disposed to be capable of being in contact with a gas introduced into the element and a second electrode disposed so that a part made of the solid electrolyte is located between the first electrode and the second electrode; and a pumping diagnostic part to determine whether an inter-electrode electric field produced in the part made of the solid electrolyte through application of a predetermined pump voltage between the electrodes exceeds a first threshold, and, when the inter-electrode electric field exceeds the first threshold, the predetermined pump voltage is reduced so that the inter-electrode electric field falls below the first threshold.

公开(公告)号：US11852607B2

公开(公告)日：2023-12-26

申请号：US17205633

申请日：2021-03-18

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke Watanabe ,  Shotaro Niizuma

IPC: G01N27/04 ,  G01N27/406 ,  G01N27/41 ,  G01N33/00

CPC classification number: G01N27/41 ,  G01N27/4062 ,  G01N33/0037

Abstract: A sensor element includes a first pump cell including a first pump electrode and a first reference electrode, a first pump circuit including the first pump cell and a first reference electrode lead, a second pump cell including a second pump electrode and a second reference electrode and a second pump circuit including the second pump cell and a second pump electrode. A resistance value R2 of the second pump circuit is higher than a resistance value R1 of the first pump circuit, and a porosity P2 of the second reference electrode lead is higher than a porosity P1 of the first reference electrode lead.

公开(公告)号：US11768169B2

公开(公告)日：2023-09-26

申请号：US16686812

申请日：2019-11-18

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke Watanabe ,  Takao Murase ,  Masashi Yasui

IPC: H05B3/02 ,  G01N27/406 ,  G01N27/409 ,  G01N27/416 ,  H05B3/14 ,  H05B1/02 ,  H05B3/00 ,  H05B3/26

CPC classification number: G01N27/4067 ,  H05B1/0247 ,  H05B3/0014 ,  H05B3/265

Abstract: A heater section includes a plate-like ceramic body (a first substrate layer 1, a second substrate layer 2, and a third substrate layer 3) having a longitudinal direction (front-rear direction) and a short-length direction (left-right direction), and a heater 72 disposed within the plate-like ceramic body and including a lead section 79 and a heating section 76 connected to the lead section 79. The heating section 76 includes a straight portion 78 extending along the longitudinal direction, and a lead side curved portion 77b connected to one of the ends of the straight portion 78 closer to the lead section 79. The lead side curved portion 77b has a lower resistance per unit length than the straight portion 78 at one or more temperatures in the range of 700° C. to 900° C.