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：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：US20210109058A1

公开(公告)日：2021-04-15

申请号：US17128361

申请日：2020-12-21

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Takayuki SEKIYA

IPC: G01N27/41 ,  G01N1/24 ,  G01R19/00 ,  G01N27/407

Abstract: In a gas sensor, oxygen pumping control is performed to pump oxygen from the surroundings of an outer side pump electrode into the surroundings of a reference electrode. In addition, during execution of the oxygen pumping control, a pump current Ip2 is measured when oxygen originating from NOx is pumped out from the surroundings of a measurement electrode so that a voltage V2 reaches a target voltage V2*. Then, the NOx concentration of a measurement-object gas is calculated based on Ip2. In the gas sensor, the NOx concentration is corrected based on DVref which is the difference between Vref1 and Vref2, Vref1 across the reference electrode and the outer side pump electrode when the oxygen pumping control is not performed, Vref2 across the reference electrode and the outer side pump electrode when the oxygen pumping control is performed.

公开(公告)号：US20200041442A1

公开(公告)日：2020-02-06

申请号：US16520466

申请日：2019-07-24

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Takayuki SEKIYA ,  Shota KAGEYAMA

IPC: G01N27/417 ,  G01N27/407

Abstract: A sensor element includes: a main pump cell constituted by an inner electrode provided to face a first inner space into which a measurement gas is introduced, an external electrode provided on an element surface, and a solid electrolyte therebetween; and a measurement pump cell constituted by a measurement electrode provided to face a second inner space communicated with the first inner space, an external electrode, and a solid electrolyte therebetween. A diffusion resistance from a gas inlet to the inner electrode is 200 to 1000 cm−1. For the first inner space and a unit electrode part of the inner electrode, a space length is 2.5 to 10 mm, a space thickness is 50 to 300 μm, an electrode length/the space length is 0.5 to 1.0, and an electrode width/the space width is 0.5 to 1.0.

公开(公告)号：US20190285575A1

公开(公告)日：2019-09-19

申请号：US16351741

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 an element surface, and a solid electrolyte located therebetween; and a measurement pump cell constituted by the measurement electrode facing a second inner space which is communicated with the first inner space and functioning as a reduction catalyst for NOx, and a solid electrolyte located therebetween. The inner pump electrode has a planar shape in which two parts of a front end part relatively having a large area and a rear end part relatively having a small area are sequentially connected in this order from an upstream side in a longitudinal direction of the sensor element while satisfying requirements of a predetermined size and area.

公开(公告)号：US20190285572A1

公开(公告)日：2019-09-19

申请号：US16351562

申请日：2019-03-13

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Takayuki SEKIYA ,  Yuki NAKAYAMA ,  Shota KAGEYAMA

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

Abstract: A sensor element includes: a main pump cell constituted by an inner pump electrode facing the first inner space into which a measurement gas is introduced, an external pump electrode provided on an element surface, and a solid electrolyte located therebetween; a measurement electrode facing a second inner space communicating with the first inner space and functioning as a reduction catalyst for NOx; and a measurement pump cell constituted by the measurement electrode, the external pump electrode, and a solid electrolyte located therebetween. A diffusion resistance from the gas inlet to the inner pump electrode ranges from 200-1000 cm−1, a resistance of the main pump cell is equal to or smaller than 150Ω, a distance between the electrodes ranges from 0.1-0 6 mm, and the inner pump electrode which is a cermet made of an Au—Pt alloy and ZrO2 has an area ranging from 5-20 mm2.

公开(公告)号：US20160076919A1

公开(公告)日：2016-03-17

申请号：US14948437

申请日：2015-11-23

Applicant: NGK INSULATORS, LTD.

Inventor： Mika MURAKAMI ,  Takayuki SEKIYA ,  Tomoya SEIMORI

IPC: G01D11/24

CPC classification number: G01D11/245 ,  G01N27/4077

Abstract: The gas sensor 100 has a gas flow channel 127 formed therein by an inner protection cover 130. The gas flow channel 127 is formed in the pathway of measured gas from a first outer gas hole 144a formed in an outer protection cover 140 that covers the tip end of a sensor element 110 to a gas inlet port 111 of the sensor element 110. The gas flow channel 127 extends from the rear end side to the tip end side of the sensor element 110 and is open to the sensor element chamber 124 having the gas inlet port 111 disposed therein.

Abstract translation: 气体传感器100具有由内部保护盖130形成在其中的气体流动通道127.气体流动通道127形成在来自覆盖尖端的外部保护盖140中形成的第一外部气体孔144a的测量气体的路径中 传感器元件110的端部连接到传感器元件110的气体入口端口111.气体流动通道127从传感器元件110的后端侧延伸到顶端侧，并且对于具有传感器元件110的传感器元件室124开放 设置在其中的气体入口111。