公开(公告)号：US20170167994A1

公开(公告)日：2017-06-15

申请号：US15367334

申请日：2016-12-02

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Yuki NAKAYAMA ,  Kosuke MONNA ,  Osamu NAKASONE

IPC: G01N27/02 ,  G01N27/407

CPC classification number: G01N27/026 ,  G01N27/028 ,  G01N27/4071 ,  G01N27/4073 ,  G01N27/4075 ,  G01N27/4175

Abstract: Provided is a method of suitably judging necessity of a recovering process carried out on a mixed-potential gas sensor based on an extent of reversible deterioration occurring in a sensing electrode. The method includes the steps of: (a) performing impedance measurement between a sensing electrode exposed to a measurement gas and a reference electrode exposed to a reference atmosphere, which are provided in the gas sensor; and (b) judging necessity of a recovering process based on electrode reaction resistance or a diagnosis parameter correlating with the electrode reaction resistance wherein the electrode reaction resistance and the diagnosis parameter are obtained based on a result of the impedance measurement. The two steps are intermittently or periodically repeated during use of the gas sensor, and it is judged that a recovering process is necessary when the judge parameter satisfies a predetermined threshold condition in the step (b).

公开(公告)号：US20130230788A1

公开(公告)日：2013-09-05

申请号：US13676188

申请日：2012-11-14

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Hiroshi HAYASHI ,  Takashi RYU ,  Toshihiro YOSHIDA ,  Yuto YAMADA

IPC: H01M8/24

CPC classification number: H01M8/2425 ,  H01M4/8652 ,  H01M4/8673 ,  H01M8/0219 ,  H01M8/1213 ,  Y02E60/521 ,  Y02E60/525

Abstract: A solid oxide fuel cell includes a first cell, a second cell and an interconnector. The first cell and the second cell respectively include an anode containing NiO and CaZrO3, a cathode, and a solid electrolyte layer disposed between the anode and the cathode. The interconnector is connected to the anode of the first cell and the current collector of the second cell. The interconnector contains LaCaCrO3. The molar ratio of Ca to Zr in the anode is greater than 1.0.

Abstract translation: 固体氧化物燃料电池包括第一电池，第二电池和互连器。 第一电池和第二电池分别包括含有NiO和CaZrO 3的阳极，阴极和设置在阳极和阴极之间的固体电解质层。 互连器连接到第一电池的阳极和第二电池的集电器。 互连器包含LaCaCrO3。 阳极中Ca与Zr的摩尔比大于1.0。

公开(公告)号：US20230324329A1

公开(公告)日：2023-10-12

申请号：US18185487

申请日：2023-03-17

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Taku OKAMOTO

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

CPC classification number: G01N27/4078 ,  G01N27/41 ,  G01N33/0037

Abstract: A casing of a gas sensor having a reference gas space therein includes: an outer tube into which an end portion of a sensor element protrudes; and a seal member fit into an end portion of the outer tube to seal the reference gas space, the sensor element includes: a first electrode lead portion including a first electrode lead to electrically connect an outside and at least one inner electrode and a first lead insulating layer covering the first electrode lead; and a second electrode lead portion including a second electrode lead that can electrically connect the outside and a measurement electrode and a second lead insulating layer covering the second electrode lead, and A/B

公开(公告)号：US20230324327A1

公开(公告)日：2023-10-12

申请号：US18159830

申请日：2023-01-26

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Taku OKAMOTO

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

CPC classification number: G01N27/4065 ,  G01N27/4078 ,  G01N27/41 ,  G01N33/0037

Abstract: A controller of a gas sensor includes: a concentration identification part identifying a concentration of a predetermined gas component based on a measurement pump current flowing between a measurement electrode and an out-of-space pump electrode in accordance with the concentration of the predetermined gas component due to application of a predetermined pump voltage; and a correction processing part correcting the concentration of the predetermined gas component identified by the concentration identification part, the correction processing part corrects the concentration of the predetermined gas component based on a correlation identified in advance between an offset current value as a magnitude of the measurement pump current when a measurement gas not containing the predetermined gas component flows or a normalized value of the offset current value and output fluctuations of the measurement pump current at startup of the gas sensor.

公开(公告)号：US20220299464A1

公开(公告)日：2022-09-22

申请号：US17825080

申请日：2022-05-26

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Soichiro YOSHIDA ,  Ryo HASHIKAWA

IPC: G01N27/419 ,  G01N27/30 ,  G01N27/406 ,  G01N27/409 ,  G01N27/41

Abstract: A gas sensor includes a sensor element and a pump cell controller. During a normal operation time of the sensor element, the pump cell controller executes a normal time measurement pump control process of pumping out the oxygen in a measurement chamber by controlling a measurement pump cell so that voltage for measurement reaches a normal time target value. At the start-up time of the sensor element, the pump cell controller executes a start-up time measurement pump control process of pumping out the oxygen in the measurement chamber by controlling the measurement pump cell so that the voltage for measurement reaches a start-up time target value higher than the normal time target value. When determining that the oxygen concentration in the measurement chamber is stabilized, the pump cell controller makes switching from the start-up time measurement pump control process to the normal time measurement pump control process.

公开(公告)号：US20220107287A1

公开(公告)日：2022-04-07

申请号：US17487021

申请日：2021-09-28

Applicant: NGK Insulators, Ltd.

Inventor： Taku OKAMOTO ,  Yuichiro KONDO

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

Abstract: Provided is a sensor element and a gas sensor capable of suppressing a disadvantage resulting from the structure of a diffusion control unit while suppressing the influence of a dynamic pressure resulting from an operation of an engine. A sensor element is used to measure the concentration of a predetermined gas component in a measurement target gas. The sensor element includes an oxygen ion-conductive solid electrolyte. A gas introduction opening is formed at one end portion in the long side direction of the sensor element. An internal cavity is formed inside the sensor element. A diffusion control unit is formed between the gas introduction opening and the internal cavity. The diffusion control unit includes first and second diffusion control units that are arranged along the long side direction. The first diffusion control unit includes a first opening portion. The second diffusion control unit includes a second opening portion.

公开(公告)号：US20210208095A1

公开(公告)日：2021-07-08

申请号：US17143188

申请日：2021-01-07

Applicant: NGK INSULATORS, LTD.

Inventor： Daichi ICHIKAWA ,  Taku OKAMOTO

IPC: G01N27/409 ,  G01N27/407 ,  G01N27/41

Abstract: A gas sensor includes a main pump cell, a storage unit that stores information about a zero point in a first correspondence relationship, where the first correspondence relationship is a linear correspondence relationship between the oxygen concentration in a measurement-object gas and the main pump current, an oxygen-concentration-detecting unit that detects the oxygen concentration in a measurement-object gas, based on a measured value p of the main pump current and the information about the zero point, and a measured-value-obtaining unit that performs a second control process and that obtains a measured value b1 at a measurement point B1 at which a known value of the oxygen concentration and the main pump current are relevant to each other with a measurement timing. The oxygen-concentration-detecting unit makes zero point correction such that a divergence of the zero point from the first correspondence relationship is corrected based on the measured value b1.

公开(公告)号：US20200003726A1

公开(公告)日：2020-01-02

申请号：US16452593

申请日：2019-06-26

Applicant: NGK INSULATORS, LTD.

Inventor： Kunihiko NAKAGAKI ,  Taku OKAMOTO ,  Osamu NAKASONE ,  Nobukazu IKOMA

IPC: G01N27/41 ,  G01M15/10 ,  F01N11/00 ,  G01N27/407

Abstract: A gas sensor includes an element body, an adjustment pump cell, a preliminary pump cell, a measurement electrode, a reference electrode, a specific gas concentration detection device. The element body provides a measurement-object gas flow section to allow a measurement-object gas to be introduced into and flow through the measurement-object gas flow section. The adjustment pump cell adjusts an oxygen concentration of an oxygen concentration adjustment chamber in the measurement-object gas flow section. The preliminary pump cell pumps oxygen into a preliminary chamber to prevent the measurement-object gas in a low-oxygen atmosphere from reaching the oxygen concentration adjustment chamber, the preliminary chamber being provided upstream of the oxygen concentration adjustment chamber in the measurement-object gas flow section. The measurement electrode is disposed on an inner peripheral surface of a measurement chamber provided downstream of the oxygen concentration adjustment chamber in the measurement-object gas flow section.

公开(公告)号：US20180128771A1

公开(公告)日：2018-05-10

申请号：US15795463

申请日：2017-10-27

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Noriko HIRATA ,  Yuki NAKAYAMA

IPC: G01N27/406 ,  G01N27/407 ,  F01N13/00

CPC classification number: G01N27/4067 ,  F01N11/00 ,  F01N13/008 ,  F01N2550/00 ,  F01N2560/02 ,  F01N2560/20 ,  G01N27/4071 ,  G01N27/4075 ,  Y02T10/47

Abstract: A gas sensor includes a sensor element made of an oxygen-ion conductive solid electrolyte, at least one electrode provided to the sensor element so as to contact a measurement gas, and a controller configured to control the gas sensor. The sensor element is heated, by a heater provided to the sensor element, at a temperature higher than an operating temperature set in advance for a predetermined time period at start of the gas sensor, and then the temperature of the sensor element is decreased to the operating temperature.

公开(公告)号：US20180088074A1

公开(公告)日：2018-03-29

申请号：US15708431

申请日：2017-09-19

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Yuki NAKAYAMA ,  Noriko HIRATA

IPC: G01N27/407

CPC classification number: G01N27/4077 ,  G01N27/4071 ,  G01N27/4075 ,  G01N27/4076

Abstract: A gas sensor that is unlikely to have Au evaporation from an external electrode even when used under a high temperature atmosphere is provided. The gas sensor includes a sensor element mainly made of an oxygen-ion conductive solid electrolyte; an external electrode provided on the sensor element and containing a Pt—Au alloy; and an electrode evaporation preventing film provided on the sensor element while being insulated from the sensor element and separated from the external electrode, and made of Au or a Pt—Au alloy having an Au composition ratio not smaller than an Au composition ratio of the Pt—Au alloy contained in the external electrode. A protection cover is provided so that at least part of the sensor element, at which the external electrode and the electrode evaporation preventing film is positioned, is inside the protection cover, and so that a measurement gas is introduced inside the protection cover.