公开(公告)号：US20170052143A1

公开(公告)日：2017-02-23

申请号：US15238817

申请日：2016-08-17

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Takao MURASE ,  Masashi YASUI ,  Rui SAKAGUCHI

IPC: G01N27/406 ,  G01N27/407 ,  H05B3/26 ,  H05B1/02 ,  H05B3/00

Abstract: The heater 72 of the heater portion includes the linear portions 78 and the bend portions 77. A resistance value per unit length of the bend portions 77 at least at a temperature within a temperature range of no less than 700° C. and no more than 900° C. is lower than a resistance value per unit length of the linear portions 78.

Abstract translation: 加热器部分的加热器72包括直线部分78和弯曲部分77.弯曲部分77的每单位长度的电阻值至少在不低于700℃的温度范围内的温度和不超过 900℃低于线性部分78的每单位长度的电阻值。

公开(公告)号：US20170052142A1

公开(公告)日：2017-02-23

申请号：US15238799

申请日：2016-08-17

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Takao MURASE ,  Masashi YASUI

IPC: G01N27/406 ,  G01N27/407 ,  H05B3/26 ,  H05B1/02 ,  H05B3/00

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

Abstract: A heating element 76 of a heater section includes an inner region 91, having a lower resistance per unit length than an outer region 92 at one or more temperatures in the range of 700° C. to 900° C.

Abstract translation: 加热器部分的加热元件76包括在700℃至900℃的一个或多个温度下具有比外部区域92单位长度更低的电阻的内部区域91。

公开(公告)号：US20240192161A1

公开(公告)日：2024-06-13

申请号：US18524727

申请日：2023-11-30

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Junya SUGIURA

IPC: G01N27/41 ,  G01N27/407 ,  G01N27/409 ,  G01N27/417 ,  G01N33/00

CPC classification number: G01N27/41 ,  G01N27/4074 ,  G01N27/409 ,  G01N27/4175 ,  G01N33/0037 ,  G01N33/0054

Abstract: A gas sensor includes a sensor element and a control unit for controlling the sensor element. The sensor element includes: a base part; a measurement-object gas flow cavity; an oxygen pump cell including an intracavity oxygen pump electrode and an extracavity oxygen pump electrode; a reference gas chamber; and a reference electrode disposed in the reference gas chamber. The control unit includes: a concentration detecting part for detecting an oxygen concentration in a measurement-object gas based on a current value of an oxygen pump current flowing through the oxygen pump cell; and a determining and correcting part for performing correction to the current value of the oxygen pump current flowing through the oxygen pump cell when determining that an oxygen concentration detected by the concentration detecting part is different from an actual oxygen concentration in the measurement-object gas.

公开(公告)号：US20240011942A1

公开(公告)日：2024-01-11

申请号：US18472553

申请日：2023-09-22

Applicant: NGK INSULATORS, LTD.

Inventor： Takayuki SEKIYA ,  Yusuke WATANABE ,  Kodai ICHIKAWA

IPC: G01N27/419 ,  G01N33/00

CPC classification number: G01N27/419 ,  G01N33/0037

Abstract: A sensor element for detecting a specific gas concentration in a measurement-object gas, the sensor element includes: an element body internally provided with a measurement-object gas flow portion that introduces a measurement-object gas and causes the measurement-object gas to flow therethrough; a reference-gas introduction portion disposed inside the element body, the reference-gas introduction portion being configured to introduce a reference gas; a reference-gas adjustment pump cell having a pump reference electrode disposed inside the element body, the reference-gas adjustment pump cell being configured to pump oxygen into a periphery of the pump reference electrode; and a sensor cell having a voltage reference electrode disposed inside the element body, and a measurement-object gas-side electrode disposed inside or outside the element body, the sensor cell being configured to generate a voltage based on an oxygen concentration in a periphery of the measurement-object gas-side electrode.

公开(公告)号：US20230408440A1

公开(公告)日：2023-12-21

申请号：US18333801

申请日：2023-06-13

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE

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

CPC classification number: G01N27/407 ,  G01N27/4065 ,  G01N33/0027

Abstract: A gas sensor includes a sensor element and a control unit thereof. The sensor element includes: a base part; a measurement-object gas flow cavity formed from one end part in a longitudinal direction of the base part; a pump cell including an intracavity electrode disposed in the measurement-object gas flow cavity; and a reference electrode disposed in a reference gas chamber formed inside the base part. The control unit includes: a driving control part; a storing part storing in advance, a standard correspondence relationship at a standard time at which a reference potential of the reference electrode is at a predetermined value; and a diagnosing part obtaining a diagnostic correspondence relationship, and comparing the obtained diagnostic correspondence relationship with the standard correspondence relationship to diagnose a deviation of a reference potential of the reference electrode at the diagnostic time from the predetermined value at the standard time.

公开(公告)号：US20230314366A1

公开(公告)日：2023-10-05

申请号：US18187049

申请日：2023-03-21

Applicant: NGK INSULATORS, LTD.

Inventor： Yuichiro KONDO ,  Osamu NAKASONE ,  Yusuke WATANABE

IPC: G01N27/41 ,  G01M15/10 ,  G01N27/409 ,  G01N27/27

CPC classification number: G01N27/41 ,  G01M15/102 ,  G01N27/409 ,  G01N27/27

Abstract: A sub adjustment pump cell pumps out oxygen from a measurement gas introduced into a sub adjustment chamber to the extent that H2O and CO2 contained in the measurement gas are not decomposed, a first pump cell pumps out oxygen from a first chamber so that substantially all of H2O and CO2 contained in the measurement gas introduced from the sub adjustment chamber into the first chamber are decomposed, concentrations of H2O and CO2 are identified from a pump-in current when H2 and CO generated by decomposition are oxidized in the second chamber and the third chamber, and a concentration of oxygen contained in the measurement gas is identified based on a magnitude of a current flowing between a sub adjustment inner electrode and an outer electrode at the time when the sub adjustment pump cell pumps out oxygen from the sub adjustment chamber.

公开(公告)号：US20230204534A1

公开(公告)日：2023-06-29

申请号：US18085642

申请日：2022-12-21

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE

IPC: G01N27/407 ,  G01N27/419 ,  G01N27/409 ,  G01N27/30 ,  G01N27/406

CPC classification number: G01N27/4071 ,  G01N27/419 ,  G01N27/4074 ,  G01N27/409 ,  G01N27/4072 ,  G01N27/301 ,  G01N27/4067

Abstract: A gas sensor includes a sensor element including an adjustment pump cell and a measurement pump cell, and a control unit including a pump control part. The pump control part performs a startup pump control at a startup of the sensor element, and a steady driving pump control at a steady drive after the startup. In the startup pump control, the pump control part applies, between an inner pump electrode and an outer pump electrode of the adjustment pump cell, a startup voltage of the adjustment pump cell that is higher than a voltage applied in the steady driving pump control; and applies, between an inner measurement electrode and an outer measurement electrode of the measurement pump cell, a startup voltage of the measurement pump cell that is higher than a voltage applied in the steady driving pump control and lower than the startup voltage of the adjustment pump cell.

公开(公告)号：US20230194493A1

公开(公告)日：2023-06-22

申请号：US18079026

申请日：2022-12-12

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Ryo HASHIKAWA ,  Daichi ICHIKAWA

IPC: G01N33/00 ,  G01N27/407

CPC classification number: G01N33/0037 ,  G01N27/4074 ,  G01N27/4076

Abstract: A gas sensor includes a sensor element and a controller. The sensor element includes an element body provided with a measurement-object gas flow section therein, a measurement electrode disposed in the measurement-object gas flow section, an outer pump electrode provided in the element body so that the outer pump electrode comes into contact with a measurement-object gas, a reference electrode, a reference-gas introduction section that causes a reference gas to flow to the reference electrode, and a reference-gas adjustment pump cell constituted by including the outer pump electrode and the reference electrode. The controller performs a moisture-absorption-state diagnosis process of diagnosing a moisture absorption state around the reference electrode based on a pump current flowing through the reference-gas adjustment pump cell when the reference-gas adjustment pump cell is controlled to pump out oxygen from a periphery of the reference electrode to a periphery of the outer pump electrode.

公开(公告)号：US20220373503A1

公开(公告)日：2022-11-24

申请号：US17882889

申请日：2022-08-08

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/406 ,  G01N27/407

Abstract: A gas sensor has a sensor element, first element pads, second element pads, first contact-point members, and second contact-point members. The sensor element has first and second surfaces that are positioned on opposite sides in a first direction. The first element pads are disposed on the first surface. The second element pads are disposed on the second surface in a quantity greater than that of the first element pads. The first and second contact-point members are connected to the first and second element pads, respectively. The width (Wt) of at least one of the second contact-point members is less than the widths (Wa-Wd) of the rest of the first and second contact-point members.

公开(公告)号：US20220341869A1

公开(公告)日：2022-10-27

申请号：US17859891

申请日：2022-07-07

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/41 ,  G01N27/407

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 two internal chambers 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 internal chambers, and solid electrolytes located therebetween; and a heater buried in the ceramic body; and a porous leading-end protective layer surrounding a first range at least including a part from a leading end surface to two internal chambers close to the gas inlet of the element base. A single heat insulating space is interposed between the leading-end protective layer and a portion of the element base in which the two internal chambers are located.