公开(公告)号：US20180172625A1

公开(公告)日：2018-06-21

申请号：US15850150

申请日：2017-12-21

Applicant: DENSO CORPORATION

Inventor： Hiroki ICHIKAWA ,  Yusuke TODO ,  Takashi ARAKI

IPC: G01N27/41 ,  G01N27/407

Abstract: A gas sensor element of the present disclosure includes a measurement gas chamber, a pump cell, a sensor cell including a sensor electrode, and a pump-cell controller. When the gas sensor element is activated before detecting a concentration of a gas, in order to remove oxygen occluded in the sensor electrode, the pump-cell controller applies a removing voltage to the pump cell so that a reducing gas is generated. The sensor electrode has a plurality of noble metal regions which are made of noble metal and electrolyte regions which are distributed so that an interface is generated between a part of a solid electrolyte body and the plurality of noble metal regions. The sensor electrode has an open pore which extends from an electrode surface of the sensor electrode and reaches at least one of the plurality of noble metal regions.

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：US20190004008A1

公开(公告)日：2019-01-03

申请号：US16062879

申请日：2016-12-09

Applicant: DENSO CORPORATION

Inventor： Yusuke TODO ,  Mitsunobu NAKATO ,  Hiroki ICHIKAWA

IPC: G01N27/419 ,  G01N27/407 ,  G01N27/404 ,  G01N33/00

Abstract: A gas sensor element including a solid electrolyte body, a sensor electrode, and a reference electrode is provided. The solid electrolyte body has oxygen ion conductivity and includes a measurement gas surface to be exposed to a measurement gas introduced from the exterior and a reference gas surface to be exposed to a reference gas introduced from the exterior. The sensor electrode is provided on the measurement gas surface of the solid electrolyte body. The reference electrode is provided on the reference gas surface of the solid electrolyte body. The sensor electrode includes a porous body containing a solid electrolyte having oxygen ion conductivity and a precious metal, the peak pore size of the sensor electrode being 0.03 μm to 0.3 μm.

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：US20190391108A1

公开(公告)日：2019-12-26

申请号：US16448092

申请日：2019-06-21

Applicant: DENSO CORPORATION

Inventor： Hao WU ,  Shota HAGINO ,  Hiroki ICHIKAWA

IPC: G01N27/406 ,  G01N27/49 ,  G01N27/407

Abstract: A nitrous oxide concentration detector includes a control unit. In the control unit, a first control section controls a voltage application section and a heater to achieve a first state in which nitric oxide undergoes electrolysis and nitrous oxide does not undergo electrolysis. A second control section controls the voltage application section and the heater to achieve a second state in which nitric oxide and nitrous oxide undergo electrolysis. An estimation section estimates an estimated current that flows between a first electrode and a second electrode due to electrolysis of nitric oxide in the second state based on a first current detected by a current detector in the first state. A calculation section calculates a nitrous oxide concentration based on a third current obtained by subtracting the estimated current estimated by the estimation section from a second current detected by the current detector in the second state.

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：US20200249124A1

公开(公告)日：2020-08-06

申请号：US16775393

申请日：2020-01-29

Applicant: DENSO CORPORATION

Inventor： Yuki MURAYAMA ,  Shoki SHIMIZU ,  Hiroki ICHIKAWA ,  Akari HASEGAWA

IPC: G01M15/10 ,  G01N27/406 ,  G01N27/407

Abstract: A control device performs deterioration diagnosis of a gas sensor including a pump cell and a sensor cell. The control device includes a control unit, a determination value acquisition unit, a diagnosis unit, and a correction unit. The control unit temporarily reduces the oxygen removal capability of the pump cell. The determination value acquisition unit acquires an output ratio of the sensor cell based on an output value of the sensor cell in a state where the oxygen removal capability of the pump cell is temporarily reduced. The diagnosis unit performs deterioration diagnosis of the gas sensor by comparing the output ratio with a determination threshold. The correction unit sets a correction coefficient based on an atmospheric pressure and an oxygen concentration, and also corrects the output ratio using the correction coefficient.