公开(公告)号：US20210247354A1

公开(公告)日：2021-08-12

申请号：US17245784

申请日：2021-04-30

Applicant: DENSO CORPORATION

Inventor： Eriko MAEDA ,  Takumi OKAMOTO ,  Hiroaki YOTO ,  Toshihiko HARADA

IPC: G01N27/407

Abstract: An ammonia detector includes a solid electrolyte body, a detection electrode, and a reference electrode. The solid electrolyte body includes a measured gas facing surface, which comes into contact with a measured gas, and a reference gas facing surface, which comes into contact with a reference gas. The detection electrode is formed on the measured gas facing surface of the solid electrolyte body. The reference electrode is formed on the reference gas facing surface of the solid electrolyte body. The detection electrode contains at least alumina and 50% or more by mass of Pd.

公开(公告)号：US20210222607A1

公开(公告)日：2021-07-22

申请号：US17223579

申请日：2021-04-06

Applicant: DENSO CORPORATION

Inventor： Kensuke TAKIZAWA ,  Toshihiko HARADA ,  Hiroki ICHIKAWA

IPC: F01N11/00 ,  F01N3/20 ,  B01D53/94

Abstract: An abnormality determination apparatus for an ammonia sensor is usable in an exhaust purification system including a catalyst, a supply apparatus, an ammonia sensor, an NOX sensor, and an oxygen sensor. During a continuation period within which ammonia supply to the catalyst continues after the supply apparatus stops supply of reductant, the abnormality determination apparatus calculates the ammonia concentration on a downstream side of the catalyst as a first concentration value, based on an output of the ammonia sensor and an output of the oxygen sensor. During the continuation period, the abnormality determination apparatus calculates the ammonia concentration on the downstream side of the catalyst as a second concentration value, based on an output of the NOX sensor and the output of the oxygen sensor. The abnormality determination apparatus determines presence or absence of abnormality in the ammonia sensor based on the first concentration value and the second concentration value.

公开(公告)号：US20200088665A1

公开(公告)日：2020-03-19

申请号：US16572676

申请日：2019-09-17

Applicant: DENSO CORPORATION

Inventor： Kensuke TAKIZAWA ,  Toshihiko HARADA ,  Hiroki ICHIKAWA

IPC: G01N25/46 ,  G01N25/00 ,  G01N31/22

Abstract: In a gas sensor diagnosis device, a temperature change part varies a temperature of a sensor element in an ammonia sensor at a first temperature which is outside of the predetermined activation temperature range. A zero-voltage shift detection part detects whether the mixed potential of the sensor element is not more than a predetermined output threshold value after the temperature change part varies a temperature of the sensor element. A temperature acquisition part detects a zero-voltage shift temperature of the sensor element at which the zero-voltage shift detection part detects that the mixed potential of the sensor element drops below the predetermined output threshold value. The deterioration state detection part detects a deterioration state of the ammonia sensor based on the zero-voltage shift temperature of the sensor element detected by the temperature acquisition part.

公开(公告)号：US20220011257A1

公开(公告)日：2022-01-13

申请号：US17485962

申请日：2021-09-27

Applicant: DENSO CORPORATION

Inventor： Toshihiko HARADA ,  Keigo MIZUTANI ,  Hironobu SHIMOKAWA ,  Yusuke KAWAMOTO ,  Hiroki ICHIKAWA

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

Abstract: A sensor element of a gas sensor includes a solid electrolyte body, a first insulator, a gas chamber, a second insulator, a reference gas duct, a pump electrode, a sensor electrode, a reference electrode, and a shield layer. The shield layer is formed of an insulating ceramic material and covers a sensor-side electrode portion of the reference electrode, the sensor-side electrode portion being arranged to overlap the sensor electrode through the solid electrolyte body.

公开(公告)号：US20210333232A1

公开(公告)日：2021-10-28

申请号：US17370182

申请日：2021-07-08

Applicant: DENSO CORPORATION

Inventor： Toshihiko HARADA ,  Kensuke TAKIZAWA ,  Hiroki ICHIKAWA

IPC: G01N27/407 ,  G01N27/416 ,  G01N27/41 ,  G01N33/00 ,  G01N27/409

Abstract: A gas concentration detection device has a first element part, a first detection part, a second element part, a second detection part and a sensitivity correction part. The sensitivity correction part is configured to correct a second gas component concentration detected by the second detection part based on a time difference between a first response time of the first detection part and a second response time of the second detection part when the first detection part and the second detection part have a function of detecting a common gas component contained in a target gas to be detected, and a variation in concentration of the common gas component exceeds a reference variation amount.

公开(公告)号：US20210310984A1

公开(公告)日：2021-10-07

申请号：US17350143

申请日：2021-06-17

Applicant: DENSO CORPORATION

Inventor： Satoshi NAKAMURA ,  Toshihiko HARADA ,  Kensuke TAKIZAWA ,  Hiroki ICHIKAWA

IPC: G01N27/407 ,  G01N27/406 ,  G01N27/41

Abstract: An ammonia sensor has an ammonia element section having a first solid electrolyte body which is provided with a detection electrode and a reference electrode, a heater section that heats the first solid electrolyte body, and a potential difference detection section for detecting a potential difference between the detection electrode and the reference electrode. The detection electrode contains at least Au and Pd. The content ratio of Au and Pd on the surface of the detection electrode is more than 0 mol % and 80 mol % or less of Pd with respect to 100 mol % of Au.

公开(公告)号：US20210262974A1

公开(公告)日：2021-08-26

申请号：US17319428

申请日：2021-05-13

Applicant: DENSO CORPORATION

Inventor： Toshihiko HARADA ,  Kensuke TAKIZAWA ,  Hiroki ICHIKAWA

IPC: G01N27/406 ,  G01N27/407

Abstract: A gas sensor includes an ammonia element section, a heater, and a potential difference detecting section. The detection electrode has a distal end, a proximal end, and a central position in the longitudinal direction. The detection electrode is partitioned at the central position in the longitudinal direction into a distal end region and a proximal end region, the distal end region being located to be closer to the distal end than the proximal end region is, the proximal end region being located to be closer to the proximal end than the distal end region is. The heating section has a heating center arranged to face an offset point which is located to be closer to the distal end than the central position is, the heating center arranged to face the offset point causing average temperature in the distal end region to differ from average temperature in the proximal end region.

公开(公告)号：US20210095611A1

公开(公告)日：2021-04-01

申请号：US17101542

申请日：2020-11-23

Applicant: DENSO CORPORATION

Inventor： Satoshi NAKAMURA ,  Toshihiko HARADA ,  Kensuke TAKIZAWA ,  Eriko MAEDA ,  Hiroaki YOTO

IPC: F02D41/22 ,  F01N3/20 ,  F02D41/14

Abstract: A deterioration determination apparatus is usable with an ammonia sensor that includes an ammonia element portion that includes, a solid electrolyte, an ammonia electrode, and a reference electrode. The deterioration determining apparatus compares a first evaluation value and a second evaluation value, and determines whether deterioration has occurred in the ammonia element portion of the ammonia sensor at an evaluation time or subsequent to the evaluation time. The first evaluation value is based on a first sensor current obtained when a DC voltage is applied between the ammonia electrode and the reference electrode of the ammonia element portion at an initial time that is during an initial use period of the ammonia sensor. The second evaluation value is based on a second sensor current obtained when the DC voltage is applied between the ammonia electrode and the reference electrode subsequent to the initial period of use of the ammonia sensor.

公开(公告)号：US20180259476A1

公开(公告)日：2018-09-13

申请号：US15556090

申请日：2016-03-01

Applicant: DENSO CORPORATION

Inventor： Hironobu SHIMOKAWA ,  Toshihiko HARADA ,  Kazuki YAGI

IPC: G01N27/407 ,  C04B35/486 ,  F01N11/00

Abstract: A gas sensor element having good sensitivity and responsiveness at low temperature, and a gas sensor are provided. The gas sensor element includes a solid electrolyte member made of an oxygen ion conductive ZrO2-based ceramic, and a reference gas-side electrode and a measuring gas-side electrode respectively provided on a surface and the other surface of the solid electrolyte member. The gas sensor includes the gas sensor element. The reference gas-side electrode and the measuring gas-side electrode are formed so as to face each other with the solid electrolyte member interposed therebetween, and are both made of a noble metal or a noble metal alloy. A mixed layer with an average thickness of 800 nm or less is formed between the solid electrolyte member and the reference gas-side electrode. The mixed layer contains a noble metal or a noble metal alloy and a ZrO2-based ceramic mixed with each other.

公开(公告)号：US20180180569A1

公开(公告)日：2018-06-28

申请号：US15852115

申请日：2017-12-22

Applicant: DENSO CORPORATION

Inventor： Toshihiko HARADA ,  Shinya TERANISHI ,  Satoshi NAKAMURA ,  Hiroaki YOTO

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

CPC classification number: G01N27/4074 ,  G01N27/304 ,  G01N33/0054 ,  Y02A50/246

Abstract: Disclosed is an ammonia sensor element having a measured gas chamber, a reference gas chamber and a solid electrolyte body arranged therebetween. The solid electrolyte body has a first main surface facing the measured gas chamber and a second main surface facing the reference gas chamber. A detection electrode is formed on the first main surface. A reference electrode is formed on the second main surface. The solid electrolyte body contains a first proton conducting solid electrolyte. The detection electrode contains a second proton conducting solid electrolyte. The second proton conducting solid electrolyte has an acid strength greater than that of the first proton conducting solid electrolyte.