公开(公告)号：US20210063369A1

公开(公告)日：2021-03-04

申请号：US16998003

申请日：2020-08-20

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Takayuki SEKIYA ,  Daichi ICHIKAWA

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

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：US20210063342A1

公开(公告)日：2021-03-04

申请号：US17002942

申请日：2020-08-26

Applicant: NGK INSULATORS, LTD.

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

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

Abstract: A gas sensor includes: a sensor element; a ceramic housing holding a rear end portion of the sensor element and provided with metal terminals electrically connected to the sensor element; and an elastic insulating member that is fixed in the rear of the sensor element and into which a plurality of lead wires electrically connected to the metal terminals are inserted. The elastic insulating member has one or more common spaces formed in a surface of the elastic insulating member that faces the ceramic housing. Two or more of the lead wires are arranged in each common space.

公开(公告)号：US20200072785A1

公开(公告)日：2020-03-05

申请号：US16551765

申请日：2019-08-27

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Mika KAI ,  Tomoya SEIMORI ,  TAKASHI HINO

IPC: G01N27/407 ,  G01N27/409 ,  G01N27/419 ,  F02D41/14

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 one internal chamber 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 chamber, and a solid electrolyte located therebetween; and a heater buried in the ceramic body, and an leading-end protective layer being porous, and covering a leading end surface and four side surfaces in a predetermined range of the element base on the one end portion. The leading-end protective layer has an extension extending into the gas inlet, and fixed to an inner wall surface of the ceramic body demarcating the gas inlet.

公开(公告)号：US20240230582A9

公开(公告)日：2024-07-11

申请号：US18489293

申请日：2023-10-18

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Yohei GORO

IPC: G01N27/409 ,  G01N27/30 ,  G01N27/406 ,  G01N27/41 ,  G01N27/419 ,  G01N33/00

CPC classification number: G01N27/409 ,  G01N27/301 ,  G01N27/4067 ,  G01N27/41 ,  G01N27/419 ,  G01N33/0037

Abstract: A gas sensor includes: an element body which is internally provided with a measurement-object gas flow portion; a first pump cell including a first inner electrode disposed in the measurement-object gas flow portion; a second pump cell including a second inner electrode disposed in the measurement-object gas flow portion; a heater; a first impedance measurer configured to measure a first impedance by applying a voltage to the first inner electrode; a second impedance measurer configured to measure a second impedance by applying a voltage to the second inner electrode; and a control apparatus configured to perform a heater control process of controlling the heater so that the first impedance reaches a target value, and a correction process of correcting, based on the second impedance, a second pump current which flows through the second pump cell or a value derived based on the second pump current.

公开(公告)号：US20240133839A1

公开(公告)日：2024-04-25

申请号：US18489293

申请日：2023-10-17

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Yohei GORO

IPC: G01N27/409 ,  G01N27/30 ,  G01N27/406 ,  G01N27/41 ,  G01N27/419 ,  G01N33/00

CPC classification number: G01N27/409 ,  G01N27/301 ,  G01N27/4067 ,  G01N27/41 ,  G01N27/419 ,  G01N33/0037

Abstract: A gas sensor includes: an element body which is internally provided with a measurement-object gas flow portion; a first pump cell including a first inner electrode disposed in the measurement-object gas flow portion; a second pump cell including a second inner electrode disposed in the measurement-object gas flow portion; a heater; a first impedance measurer configured to measure a first impedance by applying a voltage to the first inner electrode; a second impedance measurer configured to measure a second impedance by applying a voltage to the second inner electrode; and a control apparatus configured to perform a heater control process of controlling the heater so that the first impedance reaches a target value, and a correction process of correcting, based on the second impedance, a second pump current which flows through the second pump cell or a value derived based on the second pump current.

公开(公告)号：US20230314363A1

公开(公告)日：2023-10-05

申请号：US18185607

申请日：2023-03-17

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/407

CPC classification number: G01N27/4077

Abstract: A sensor element includes: an element body that includes a base part in an elongated plate shape and a measurement-object gas flow part; and a porous protective layer that is formed from one end and covers at least a part in the longitudinal direction of a surface of the element body. The protective layer include: an inner layer; and an outer layer covering the inner layer and a region where the inner layer is not formed. On one principal surface in a region where the inner layer is formed, a first space exists in at least a part between the inner and outer layers, and on the one principal surface in a region where the inner layer is not formed on the one principal surface on which the first space exists, a second space exists in at least a part between the one principal surface and the outer layer.

公开(公告)号：US20230228703A1

公开(公告)日：2023-07-20

申请号：US18154370

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 ,  G01N27/406 ,  G01N33/00 ,  G01N27/30

CPC classification number: G01N27/409 ,  G01N27/41 ,  G01N27/4067 ,  G01N33/0037 ,  G01N27/30

Abstract: Provided is a gas sensor element capable of realizing both highly accurate concentration measurement in environments where the concentration of a specific gas in a measurement target gas is high and highly accurate concentration measurement in environments where the concentration is low. A gas sensor according to one aspect of the present invention adjusts a sensor element drive temperature such that the value of cell resistance of a main pump cell is a predetermined value. Further, in the gas sensor according to one aspect of the present invention, the slope of the cell resistance of the main pump cell is larger than the slope of cell resistance of a measurement pump cell.

公开(公告)号：US20230194467A1

公开(公告)日：2023-06-22

申请号：US18079027

申请日：2022-12-12

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Daichi ICHIKAWA

IPC: G01N27/419 ,  G01N27/407 ,  G01N27/409 ,  G01N27/41 ,  G01N33/00

CPC classification number: G01N27/419 ,  G01N27/4071 ,  G01N27/4074 ,  G01N27/409 ,  G01N27/41 ,  G01N33/0037

Abstract: A gas sensor includes a sensor element and a control unit for controlling the sensor element. The sensor element includes a main pump cell, an auxiliary pump cell, a measurement pump cell, and a reference electrode, wherein, in the main pump cell, a repeatedly on-off controlled main pump current is applied so that an auxiliary pump current flowing through the auxiliary pump cell is at a predetermined target current value, and, in the auxiliary pump cell, the auxiliary pump current is applied so that an electromotive force between an inner auxiliary pump electrode and the reference electrode is at a predetermined target voltage value. The control unit includes: a control power supply for applying the repeatedly on-off controlled main pump current; and a setting part for setting the target voltage value based on an electric potential difference generated between the inner main pump electrode and the reference electrode.

公开(公告)号：US20230194465A1

公开(公告)日：2023-06-22

申请号：US18079025

申请日：2022-12-12

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Ryo HASHIKAWA ,  Takayuki SEKIYA

IPC: G01N27/416 ,  G01N33/00 ,  G01N27/30 ,  G01N27/407

CPC classification number: G01N27/4162 ,  G01N33/0027 ,  G01N27/301 ,  G01N27/4071

Abstract: A gas sensor that detects a specific gas concentration in a measurement-object gas, the gas sensor includes: a sensor element having an element body provided with a measurement-object gas flow section therein, the measurement-object gas flow section introducing the measurement-object gas, a measurement electrode disposed in the measurement-object gas flow section, a measurement-object-gas side electrode provided on the element body, 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 measurement-object-gas side electrode and the reference electrode; and a controller that performs a moisture-concentration decrease process of controlling the reference-gas adjustment pump cell so that oxygen is pumped out from a periphery of the reference electrode to a periphery of the measurement-object-gas side electrode to decrease a moisture concentration around the reference electrode.

公开(公告)号：US20230194463A1

公开(公告)日：2023-06-22

申请号：US18082437

申请日：2022-12-15

Applicant: NGK INSULATORS, LTD.

Inventor： Yohei GORO ,  Yusuke WATANABE ,  Akihiro NAKAJIMA ,  Toshihiro HIRAKAWA

IPC: G01N27/409 ,  G01N33/00 ,  G01N27/407 ,  G01N27/30 ,  G01N27/41 ,  G01N27/406

CPC classification number: G01N27/409 ,  G01N33/0037 ,  G01N27/4073 ,  G01N27/301 ,  G01N27/41 ,  G01N27/4067

Abstract: A gas sensor includes an element body, a pump cell, an impedance measurer, and a calculation unit. The pump cell has an inner electrode disposed in a measurement-object gas flow section of the element body, and an outer electrode disposed outside an element body to come into contact with a measurement-object gas, the pump cell being configured to adjust an oxygen concentration in a vicinity of the inner electrode. The impedance measurer performs first measurement to measure a first impedance by applying a voltage having a first frequency to the pump cell, and second measurement to measure a second impedance by applying a voltage having a second frequency higher than the first frequency to the pump cell. The calculation unit calculates the reaction resistance index correlated with the reaction resistance of the pump cell, based on the first and second impedances.