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：US20230304963A1

公开(公告)日：2023-09-28

申请号：US18138170

申请日：2023-04-24

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Shotaro NIIZUMA ,  Toshihiro HIRAKAWA ,  Hayami AOTA

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

CPC classification number: G01N27/4073 ,  G01N27/4071 ,  G01N27/409 ,  G01N27/41 ,  G01N33/0037

Abstract: A gas sensor includes: a laminate formed of a plurality of layers including at least one layer of a solid electrolyte; a reference gas chamber formed in the laminate and containing a reference gas; and a reference electrode partially exposed in the reference gas chamber. A portion which is not exposed in the reference gas chamber, of the reference electrode is sandwiched between, among the layers, a first layer and a second layer adjacent to the first layer. When an area of the portion sandwiched between the first layer and the second layer, of the reference electrode is defined as a first area, and an area of a portion exposed in the reference gas chamber, of the reference electrode is defined as a second area, a ratio of the first area to the second area is 0.3 or more.

公开(公告)号：US20230243775A1

公开(公告)日：2023-08-03

申请号：US18102796

申请日：2023-01-30

Applicant: NGK Insulators, Ltd.

Inventor： Yusuke WATANABE ,  Shotaro NIIZUMA ,  Toshihiro HIRAKAWA

IPC: G01N27/407

CPC classification number: G01N27/4077 ,  G01N27/4071

Abstract: A gas sensor element capable of preventing a decrease in responsiveness despite a protective layer covering a gas introduction opening is provided. A gas sensor element according to an aspect of the present invention includes an element base having a surface in which a gas introduction opening is open, a protective layer, a buffer layer, and a gas introduction layer that is disposed between the element base and the buffer layer. The gas introduction layer covers the gas introduction opening, is in contact with the protective layer, and has a porosity that is 30% or more and is higher by 5% or more than the porosity of the buffer layer.

公开(公告)号：US20230228702A1

公开(公告)日：2023-07-20

申请号：US18154357

申请日：2023-01-13

Applicant: NGK Insulators, Ltd.

Inventor： Yusuke WATANABE ,  Yasumasa FUJIOKA ,  Yohei GORO ,  Akihiro NAKAJIMA ,  Shotaro NIIZUMA

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

CPC classification number: G01N27/409 ,  G01N27/41 ,  G01N33/0037 ,  G01N27/4067

Abstract: Provided is a gas sensor element capable of realizing highly accurate concentration measurement in both environments where the concentration of a specific gas in a measurement target gas is high and where the concentration is low. A gas sensor according to one aspect of the present invention determines whether the concentration of a predetermined gas component in a measurement target gas is higher or lower than a predetermined concentration. If it is determined that the concentration is lower, a specific temperature that a sensor element is to reach as a result of being heated by a heater unit is set to be lower than the specific temperature set if it is determined that the concentration is higher.

公开(公告)号：US20230194462A1

公开(公告)日：2023-06-22

申请号：US18079035

申请日：2022-12-12

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Daichi ICHIKAWA ,  Kodai ICHIKAWA ,  Takayuki SEKIYA

IPC: G01N27/409 ,  G01N33/00

CPC classification number: G01N27/409 ,  G01N33/0027

Abstract: A gas sensor includes a sensor element and a control unit for controlling the sensor element. The sensor element includes: an adjustment pump cell for adjusting an oxygen concentration in a measurement-object gas to a desired concentration; a current measurement pump cell for detecting a target gas to be measured in the measurement-object gas as a current value, the current measurement pump cell including: an inner measurement electrode and an outer measurement electrode; a reference electrode; and an electromotive force detection sensor cell for detecting an electromotive force value between the inner measurement electrode and the reference electrode. The control unit includes a switching unit for switching whether a current flows through the current measurement pump cell or not.

公开(公告)号：US20230112530A1

公开(公告)日：2023-04-13

申请号：US17882910

申请日：2022-08-08

Applicant: NGK Insulators, Ltd.

Inventor： Yusuke WATANABE ,  Shotaro NIIZUMA ,  Kirari TAKAHASHI ,  Toshihiro HIRAKAWA

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

Abstract: In order to suppress a deterioration in the measurement precision while also reducing the manufacturing cost of a gas sensor element, an aspect of the present invention is directed to a gas sensor element including: a stack formed by stacking a plurality of oxygen ion-conductive solid electrolyte layers, and including an internal space configured to receive a measurement target gas from the outside, a first face adjacent to the internal space, and a second face adjacent to an external space; a first pump electrode provided on the first face; a second pump electrode provided on the second face; a first lead formed on the first face so as to extend from the first pump electrode; and a second lead formed on the second face so as to extend from the second pump electrode and configured to be electrically connected to the first lead. At least one of the first and second leads has a shape with a maximum current density of 3.5 A/mm2 or less.

公开(公告)号：US20230091237A1

公开(公告)日：2023-03-23

申请号：US17948475

申请日：2022-09-20

Applicant: NGK INSULATORS, LTD.

Inventor： Shotaro NIIZUMA ,  Yusuke WATANABE ,  Toshihiro HIRAKAWA ,  Kirari TAKAHASHI

IPC: G01N33/00

Abstract: A sensor element for detecting a specific gas concentration in a measurement-object gas includes: an element body provided with a measurement-object gas flow section therein, the measurement-object gas flow section introducing the measurement-object gas and causing the measurement-object gas to flow therethrough; a reference electrode disposed inside the element body; and a reference-gas introduction section that causes a reference gas to flow to the reference electrode, wherein the reference-gas introduction section has a reference-gas flow path, and one or more preliminary chambers which are disposed in a middle of the reference-gas flow path, and have a diffusion resistance lower than a diffusion resistance of the reference-gas flow path, and at least part of the reference-gas flow path is composed of a porous body so that any of the one or more preliminary chambers does not directly communicate with an outside of the element body.

公开(公告)号：US20230083340A1

公开(公告)日：2023-03-16

申请号：US17989745

申请日：2022-11-18

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Takayuki SEKIYA ,  Daichi ICHIKAWA

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

Abstract: A controller of the gas sensor can perform diagnostic processing of diagnosing a situation of control to the gas sensor in a case that the gas sensor in an operation state is determined to satisfy a predetermined diagnostic condition and adjustment processing of adjusting a condition for controlling the gas sensor in accordance with a result of diagnosis. In the diagnostic processing, a main pump voltage and a diagnostic threshold as a value of a voltage not causing decomposition of NOx in the main pump cell are compared. In the adjustment processing, temperature adjustment processing to cause, in a case that the main pump voltage is diagnosed to be equal to the threshold or more, the main pump voltage to be less than the threshold, at least in a way that the heater part increases the element driving temperature in the operation state by a predetermined increase amount is performed.

公开(公告)号：US20220317084A1

公开(公告)日：2022-10-06

申请号：US17694996

申请日：2022-03-15

Applicant: NGK INSULATORS, LTD.

Inventor： Kana IBATA ,  Yusuke WATANABE ,  Shiho IWAI ,  Takayuki SEKIYA ,  Yosuke NORITAKE ,  Daichi KONDO

IPC: G01N27/407 ,  G01N27/406 ,  G01N27/419 ,  H05B3/14 ,  H05B1/02

Abstract: A ceramic heater is provided in an electronic component, and by supplying electrical current thereto, a heat generating portion thereof is heated to a temperature of greater than or equal to 700[° C.] and less than 950[° C.]. An energizing current waveform of the electrical current to the heat generating portion is a pulse waveform, and a product of a pulse voltage Vp [V] and a period T [ms] of the pulse waveform is less than or equal to 600 [V·ms].

公开(公告)号：US20220317083A1

公开(公告)日：2022-10-06

申请号：US17699896

申请日：2022-03-21

Applicant: NGK Insulators, Ltd.

Inventor： Yusuke WATANABE ,  Shotaro NIIZUMA ,  Hayami AOTA ,  Toshihiro HIRAKAWA

IPC: G01N27/407 ,  G01N27/406

Abstract: Provided is a gas sensor intended to achieve improved measurement accuracy. A gas sensor according to one aspect of the present invention includes: a gas sensor element including a gas introduction opening and a gas exhaust unit; and a protective member including a plurality of porous layers and configured to cover the gas sensor element. The plurality of porous layers include a first porous layer arranged on the innermost side and a second porous layer arranged on an outer side of the first porous layer. The first porous layer has a higher porosity than the second porous layer. The gas introduction opening and the gas exhaust unit are covered by the first porous layer. The protective member includes, between the gas introduction opening and the gas exhaust unit, a restricting portion configured to restrict the flow of gas.