公开(公告)号：US11940406B2

公开(公告)日：2024-03-26

申请号：US17205617

申请日：2021-03-18

申请人： NGK INSULATORS, LTD.

发明人： Takayuki Sekiya ,  Yusuke Watanabe

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

CPC分类号： G01N27/409 ,  G01N27/4072 ,  G01N27/41 ,  G01N27/419 ,  G01N33/0037

摘要： A sensor element includes an element body having a measurement-object gas flow section being provided therein, a first measurement pump cell that includes a first measurement electrode being disposed in a first measurement chamber and a first outer measurement electrode and that pumps out oxygen produced in a first measurement chamber, and a second measurement pump cell that includes a second measurement electrode being disposed in a second measurement chamber and a second outer measurement electrode and that pumps out oxygen produced in a second measurement chamber. The measurement-object gas flow section is configured such that a measurement-object gas passes through an oxygen concentration adjustment chamber and a first measurement-electrode diffusion-rate-controlling section in this order and reaches the first measurement chamber and that the measurement-object gas passes through the first measurement chamber and a second measurement-electrode diffusion-rate-controlling section in this order and reaches the second measurement chamber.

公开(公告)号：US11885765B2

公开(公告)日：2024-01-30

申请号：US17207996

申请日：2021-03-22

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Mika Kai ,  Ryo Onishi ,  Saki Suzuki ,  Takashi Hino

IPC分类号： G01N27/407 ,  C04B38/00 ,  G01N27/41 ,  G01N27/419

CPC分类号： G01N27/4077 ,  C04B38/00 ,  G01N27/4071 ,  G01N27/4078 ,  G01N27/41 ,  G01N27/419

摘要： A sensor element includes: an inner protective layer having a porosity of 30% to 65% on two main surfaces; an intermediate protective layer having a porosity of 25% to 80%, which is equal to or smaller than the porosity of the inner layer; and an outer protective layer surrounding an element base on an outermost periphery on the one end portion of the element, and having a porosity of 15% to 30%, which is smaller than the porosity of the intermediate layer, wherein these layers are laminated in this order at least in a range in which the at least one inner chamber is provided in the element base, the outer is in contact with the inner layer in a range in which the at least one inner chamber is not provided, and a difference of porosity between the inner layer and the outer layer is 10% to 50%.

公开(公告)号：US11885764B2

公开(公告)日：2024-01-30

申请号：US17353870

申请日：2021-06-22

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Tetsuya Ishikawa

IPC分类号： G01N27/407 ,  G01N27/419 ,  G01N27/41

CPC分类号： G01N27/4071 ,  G01N27/4072 ,  G01N27/41 ,  G01N27/419

摘要： A gas sensor according to the present application includes a detecting device that detects a specific gas concentration of a measurement-object gas based on an electromotive force generated between a reference electrode and a measurement electrode; and a reference gas regulating device that flows an oxygen pumping current between the reference electrode and a measurement-object gas side electrode and pumps oxygen from around the measurement-object gas side electrode to around the reference electrode, wherein when the average value of the oxygen pumping current is P and the limiting current value of a reference gas introduction layer when oxygen is pumped from around the reference electrode to around the measurement-object gas side electrode is Q, the ratio Q/P is from 0.8 to 10.

公开(公告)号：US11879864B2

公开(公告)日：2024-01-23

申请号：US17113432

申请日：2020-12-07

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Shotaro Niizuma ,  Hayami Aota ,  Toshihiro Hirakawa

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

CPC分类号： G01N27/4062 ,  G01N27/409 ,  H01R4/08 ,  H01R11/11 ,  H01R13/20

摘要： 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

申请人： NGK INSULATORS, LTD.

发明人： Shotaro Niizuma ,  Yusuke Watanabe ,  Toshihiro Hirakawa ,  Hayami Aota

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

摘要： 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

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Shiho Iwai

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

摘要： 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

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Mika Kai ,  Tomoya Seimori ,  Takashi Hino

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

摘要： 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

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe

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

摘要： 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

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Takayuki Sekiya

IPC分类号： G01N27/407 ,  G01N27/419

摘要： 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

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Takao Murase ,  Masashi Yasui

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

摘要： 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.