公开(公告)号：US20240011937A1

公开(公告)日：2024-01-11

申请号：US18472514

申请日：2023-09-22

Applicant: NGK INSULATORS, LTD.

Inventor： Takayuki SEKIYA ,  Yusuke WATANABE ,  Kodai ICHIKAWA

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

CPC classification number: G01N27/409 ,  G01N33/0027 ,  G01N27/41

Abstract: A sensor element is for detecting a specific gas concentration in a measurement-object gas, and includes: an element body including an oxygen-ion-conductive solid electrolyte layer and internally provided with a measurement-object gas flow portion that introduces the measurement-object gas and causes the measurement-object gas to flow therethrough; a flow portion pump cell having a pump inner electrode disposed in an internal cavity of the measurement-object gas flow portion, the flow portion pump cell being configured to pump out oxygen from the internal cavity or pump oxygen into the internal cavity; and a flow portion sensor cell having a voltage inner electrode disposed in the internal cavity, the flow portion sensor cell being configured to generate a voltage based on an oxygen concentration in the internal cavity.

公开(公告)号：US20230304965A1

公开(公告)日：2023-09-28

申请号：US18187136

申请日：2023-03-21

Applicant: NGK INSULATORS, LTD.

Inventor： Takayuki SEKIYA ,  Yusuke WATANABE

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

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

Abstract: A gas sensor includes a sensor element and a control device. The sensor element includes a first measurement pump cell and a second measurement pump cell. The control device has a low concentration measurement mode and a high concentration measurement mode. In the low concentration measurement mode, the control device controls the first measurement pump cell such that a first pump current becomes a limiting current and detects the concentration of a specific gas in a measurement-target gas based on the first pump current. In the high concentration measurement mode, the control device controls the first measurement pump cell such that the first pump current flows and also controls the second measurement pump cell such that a second pump current becomes a limiting current and detects the concentration of the specific gas in the measurement-target gas based on the first and second pump currents.

公开(公告)号：US20230296553A1

公开(公告)日：2023-09-21

申请号：US18183425

申请日：2023-03-14

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Taku OKAMOTO

IPC: G01N27/407 ,  G01N27/41

CPC classification number: G01N27/4078 ,  G01N27/41 ,  G01N27/4077

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 out-of-space pump 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：US20230288366A1

公开(公告)日：2023-09-14

申请号：US18176658

申请日：2023-03-01

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Ryo HASHIKAWA

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

CPC classification number: G01N27/41 ,  G01N27/409 ,  G01N27/4076 ,  G01N27/419 ,  G01N33/0037

Abstract: A sensor element includes: a plurality of internal spaces which sequentially communicate from a gas inlet, and in which respective inner electrodes are arranged; an outer electrode; a porous body region covering the outer electrode; and a plurality of electrochemical pump cells capable of pumping in or out oxygen between the internal spaces and an outside, and a ratio A/B is 0.07 or more, where A is a magnitude of a limiting current when a main pump cell including a main pump electrode in a first internal space located closest to the inlet and the outer pump electrode pumps in oxygen to the first internal space in a case where a pump in current evaluation gas is introduced, B is a magnitude of a limiting current when oxygen is pumped out from the first internal space in a case where a pump-out current evaluation gas is introduced.

公开(公告)号：US20230280303A1

公开(公告)日：2023-09-07

申请号：US18176649

申请日：2023-03-01

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Daichi ICHIKAWA

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

CPC classification number: G01N27/4077 ,  G01N27/409 ,  G01N27/41 ,  G01N33/0037 ,  G01N27/4071

Abstract: A controller of a gas sensor determines whether a determination target value to be an indicator of operation of pumping in oxygen in at least one electrochemical pump cell exceeds a threshold during a predetermined determination time, controls the gas sensor in a basic mode in which the at least one electrochemical pump cell is operated to maintain the oxygen concentration in at least one internal space constant unless the determination target value exceeds the threshold, and controls the gas sensor in a protected execution mode in which the at least one electrochemical pump cell is protected against operation of excessively pumping in oxygen when the determination target value exceeds the threshold.

公开(公告)号：US20230273148A1

公开(公告)日：2023-08-31

申请号：US18171908

申请日：2023-02-21

Applicant: NGK INSULATORS, LTD.

Inventor： Daichi ICHIKAWA ,  Yusuke WATANABE

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

CPC classification number: G01N27/4065 ,  G01N27/41 ,  G01N33/0027

Abstract: A controller of a NOx sensor determines whether a determination target value being an indicator of operation of pumping in oxygen of one of electrochemical pump cells other than a measurement pump cell including inner electrodes arranged in respective internal spaces of a sensor element, an out-of-space pump outer electrode disposed at a location other than the internal spaces, and solid electrolytes between these electrodes exceeds a threshold during a predetermined determination time, controls, unless the determination target value exceeds the threshold, the NOx sensor in a basic mode in which a concentration of NOx is identified based on a pump current flowing between the measurement electrode and the outer electrode, and stops, when the determination target value exceeds the threshold, the basic mode, and controls the NOx sensor in a protected execution mode in which the measurement electrode is protected against over-reduction.

公开(公告)号：US20230098074A1

公开(公告)日：2023-03-30

申请号：US17882907

申请日：2022-08-08

Applicant: NGK Insulators, Ltd.

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

IPC: G01N27/407

Abstract: Provided is a gas sensor element that can be used for relatively long period of time without leading to a problem even in a harsh usage environment. A gas sensor element according to one aspect of the present invention includes a laminate in which an internal space is provided, and a first porous layer arranged so as to face the internal space. The first porous layer is in contact with the first solid electrolyte layer and a side face of the spacer layer that faces the internal space, and has a porosity or 10% or more and 50% or less.

公开(公告)号：US20210302355A1

公开(公告)日：2021-09-30

申请号：US17205617

申请日：2021-03-18

Applicant: NGK INSULATORS, LTD.

Inventor： Takayuki SEKIYA ,  Yusuke WATANABE

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

Abstract: 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：US20210247355A1

公开(公告)日：2021-08-12

申请号：US17172104

申请日：2021-02-10

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/407

Abstract: A gas sensor includes a sensor element, a tubular body made of metal, and a sealing material. The sensor element has a surface. The tubular body has a through hole which is formed along the axial direction and through which the sensor element is inserted. The sealing material is placed inside the through hole and between the inner peripheral surface of the through hole and the sensor element. The sealing material covers a part of the surface of the sensor element. When the sensor element is viewed in cross section from a second direction perpendicular to a first direction corresponding to the longitudinal direction of the sensor element, the sealing material forms a first inclination angle of not less than 10° and not more than 80° with respect to the surface.

公开(公告)号：US20210208097A1

公开(公告)日：2021-07-08

申请号：US17207996

申请日：2021-03-22

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Mika KAI ,  Ryo ONISHI ,  Saki SUZUKI ,  Takashi HINO

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

Abstract: 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%.