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：US20220308011A1

公开(公告)日：2022-09-29

申请号：US17702018

申请日：2022-03-23

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/41 ,  G01N33/00

Abstract: A sensor element includes a base part including a plurality of oxygen-ion-conductive solid electrolyte layers stacked; a measurement-object gas flow part for introduction and flow of a measurement-object gas through a gas inlet; an inner oxygen pump electrode disposed on an inner surface of the measurement-object gas flow part; and a measurement electrode disposed on the inner surface of the measurement-object gas flow part. The inner oxygen pump electrode includes: a region (A) including an electrode end close to the gas inlet, and a region (B) including an electrode end far from the gas inlet. A content rate of an activity reducing metal in a metal material in the region (A) is higher than that in the region (B). A ratio of the length of the region (A) of the inner oxygen pump electrode to the length of the inner oxygen pump electrode is 15% to 90%.

公开(公告)号：US20210302358A1

公开(公告)日：2021-09-30

申请号：US17205209

申请日：2021-03-18

Applicant: NGK INSULATORS, LTD.

Inventor： Takayuki SEKIYA ,  Yusuke WATANABE

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

Abstract: A sensor element includes an element body having a measurement-object gas flow section provided therein, a first measurement pump cell that includes a first measurement electrode and that pumps out oxygen produced in a first measurement chamber from the specific gas, the first measurement electrode in the measurement-object gas flow section; and a second measurement pump cell that includes a second measurement electrode and that pumps out oxygen produced in a second measurement chamber from a specific gas, the second measurement electrode in the measurement-object gas flow section. The element body is configured such that a second diffusion resistance R2, which is a diffusion resistance of a route of a measurement-object gas from an outside to the second measurement electrode, is higher than a first diffusion resistance R1, which is a diffusion resistance of a route of the measurement-object gas from the outside to the first measurement electrode.

公开(公告)号：US20190285573A1

公开(公告)日：2019-09-19

申请号：US16351565

申请日：2019-03-13

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Takayuki SEKIYA

IPC: G01N27/41 ,  G01N27/30 ,  G01N27/407 ,  G01N27/409

Abstract: A sensor element includes: a main pump cell constituted by an inner pump electrode facing a first inner space into which a measurement gas is introduced, an external pump electrode provided on a surface of the sensor element, and a solid electrolyte located therebetween; and a measurement pump cell constituted by a measurement electrode facing a second inner space communicated with the first inner space and functioning as a reduction catalyst for NOx; and a solid electrolyte located therebetween. The inner pump electrode is a cermet made of Pt and ZrO2, the inner pump electrode has a porosity ranging from 1-5% and a thickness ranging from 5-20 μm, a resistance of the main pump cell is equal to or smaller than 150Ω, and a diffusion resistance from the gas inlet to the inner pump electrode is ranging from 200-1000 cm−1.

公开(公告)号：US20180284052A1

公开(公告)日：2018-10-04

申请号：US15938118

申请日：2018-03-28

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Takayuki SEKIYA

IPC: G01N27/407

Abstract: A gas sensor includes reference gas regulating device that applies a control voltage that is set between the reference electrode and the measurement-object gas side electrode; and a detecting device that detects 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：US20150276657A1

公开(公告)日：2015-10-01

申请号：US14672793

申请日：2015-03-30

Applicant: NGK Insulators, Ltd.

Inventor： Takayuki SEKIYA ,  Mika MURAKAMI ,  Naoya SAITO

IPC: G01N27/409

CPC classification number: G01N27/4072

Abstract: In a sensor element 101, a fourth diffusion rate-controlling portion 54 includes a diffusion rate-controlling portion 54a. The diffusion rate-controlling portion 54a is formed between one or more and three or less surfaces, e.g., an upper surface 58a, of upper, lower, left and right inner peripheral surfaces of a measurement-object gas flowing portion and a partition wall 56. A measurement electrode 44 is formed on one, e.g., a lower surface 62b, of upper, lower, left and right inner peripheral surfaces of a third inner cavity 61, the one surface being different in orientation from the surface along which the diffusion rate-controlling portion 54a is formed. The diffusion rate-controlling portion 54 and the measurement electrode 44 may be formed on surfaces opposite to each other. A distance L between the measurement electrode 44 and the diffusion rate-controlling portion 54a may be 0.1 mm or more.

Abstract translation: 在传感器元件101中，第四扩散速率控制部分54包括扩散速率控制部分54a。 扩散速率控制部分54a形成在测量对象气体流动部分和分隔壁56的上，下，左和右内周表面的一个或多个三个或更少表面之间，例如上表面58a 测量电极44形成在第三内腔61的上，下，左和右内周表面的一个，例如下表面62b上，该一个表面的取向方向与扩散速率 形成控制部54a。 扩散速率控制部分54和测量电极44可以形成在彼此相对的表面上。 测量电极44和扩散速率控制部分54a之间的距离L可以为0.1mm以上。

公开(公告)号：US20130126352A1

公开(公告)日：2013-05-23

申请号：US13676576

申请日：2012-11-14

Applicant: NGK Insulators, Ltd.

Inventor： Takayuki SEKIYA ,  Mika MURAKAMI ,  Tomoya SEIMORI

IPC: G01N27/407

CPC classification number: G01N27/4077 ,  F01N11/00 ,  G01M15/10

Abstract: In a gas sensor 100, a ratio A2/A1 defined by a ratio of an opening area A1 per first inner gas hole and an opening area A2 per second inner gas hole 138a is set to higher than or equal to 0.9 and lower than or equal to 3.8 and, more preferably, to higher than or equal to 1.5 and lower than or equal to 1.9. Accordingly, adhesion of water to a sensor element 110 can be sufficiently prevented. In addition, a ratio B2/B1 defined by a ratio of a total opening area B1 of the first inner gas holes to a total opening area B2 of the second inner gas holes 138a is set to higher than or equal to 0.85 and, more preferably, higher than or equal to 1.5. Accordingly, adhesion of water to the sensor element can be more reliably, effectively prevented.

Abstract translation: 在气体传感器100中，通过每第一内部气体孔的开口面积A1与每秒的内部气体孔138a的开口面积A2的比率而定义的比率A2 / A1被设定为高于或等于0.9且小于或等于 至3.8，更优选为高于或等于1.5且低于或等于1.9。 因此，能够充分地防止水对传感器元件110的附着。 此外，由第一内部气体孔的总开口面积B1与第二内部气体孔138a的总开口面积B2的比率限定的比率B2 / B1被设定为高于或等于0.85，更优选地 ，高于或等于1.5。 因此，可以更可靠地有效地防止水对传感器元件的附着。

公开(公告)号：US20250003920A1

公开(公告)日：2025-01-02

申请号：US18883280

申请日：2024-09-12

Applicant: NGK INSULATORS, LTD.

Inventor： Shiho IWAI ,  Sotaro INAGAKI ,  Ryota TOMIOKA ,  Takayuki SEKIYA

IPC: G01N27/407 ,  G01N33/00

Abstract: A sensor element for detecting a target gas to be measured in a measurement-object gas includes: a base part in an elongated plate shape, including an oxygen-ion-conductive solid electrolyte layer; a measurement-object gas flow part formed from one end part in a longitudinal direction of the base part; an inner main pump electrode disposed on an inner surface of the measurement-object gas flow part; a porous coating layer covering at least an electrode end part of the inner main pump electrode closer to the one end part in the longitudinal direction of the base part; and a measurement electrode disposed at a position farther from the one end part in the longitudinal direction of the base part than the inner main pump electrode on the inner surface of the measurement-object gas flow part.

公开(公告)号：US20240011938A1

公开(公告)日：2024-01-11

申请号：US18472569

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 internally provided with a measurement-object gas flow portion; an adjustment chamber pump cell having an adjustment electrode disposed in an oxygen concentration adjustment chamber of the measurement-object gas flow portion, and a pump outer electrode disposed outside the element body, the adjustment chamber pump cell being configured to pump out oxygen from the oxygen concentration adjustment chamber or pump oxygen into the oxygen concentration adjustment chamber; a reference-gas introduction portion disposed inside the element body; and an outer sensor cell having a voltage outer electrode disposed outside the element body, and a reference electrode disposed inside the element body, the outer sensor cell being configured to generate a voltage based on an oxygen concentration in the measurement-object gas outside the element body.