公开(公告)号：US11209388B2

公开(公告)日：2021-12-28

申请号：US16313551

申请日：2017-05-15

Applicant: DENSO CORPORATION

Inventor： Keisuke Mizutani ,  Keigo Mizutani ,  Shota Hagino ,  Mitsunobu Nakato ,  Takashi Araki

IPC: G01N27/419 ,  G01N27/416 ,  F01N13/00 ,  G01N27/407 ,  G01N27/41

Abstract: The present invention provides a gas sensor capable of suppressing a variation of a sensor output by a sensor cell to be small. A sensor element of a gas sensor comprises a first solid electrolyte body and a second solid electrolyte body having oxygen ion conductivity, a measured gas chamber into which the measured gas is introduced, a first reference gas chamber and a second reference gas chamber into which reference gas is introduced, a first pump cell, a second pump cell, a sensor cell, and a heater. A value obtained by dividing a first average cross-sectional area of the first reference gas chamber by the first length is larger than the value obtained by dividing the second average cross-sectional area of the second reference gas chamber by the second length.

公开(公告)号：US11840949B2

公开(公告)日：2023-12-12

申请号：US17487254

申请日：2021-09-28

Applicant: DENSO CORPORATION

Inventor： Kazuhiko Koike ,  Keisuke Mizutani ,  Kana Asaoku

IPC: F01N3/022 ,  B01D53/94 ,  B01D39/20 ,  B01D46/24 ,  B01J35/04

CPC classification number: F01N3/0222 ,  B01D39/2068 ,  B01D46/2429 ,  B01D46/24491 ,  B01D46/24492 ,  B01D53/94 ,  B01J35/04

Abstract: An exhaust gas purification filter includes a honeycomb structure part and sealing parts. The honeycomb structure part has a porous partition wall and a plurality of cells defined by the partition wall to form exhaust gas flow paths. The sealing parts seal alternately a gas inflow-side end face or a gas outflow-side end face of the cells. The exhaust gas purification filter includes fine pores with diameters of 10 μm or less measured by the mercury intrusion method that account for 5% or more of all pores by volume in the honeycomb structure part. The partition wall has a plurality of communication pores communicating between the cells adjacent to the partition wall and has constricted communication pore of which a largest diameter Φ1 and a smallest diameter Φ2 satisfy relationships Φ1≥50, 100×Φ2/Φ1≤20.

公开(公告)号：US10895553B2

公开(公告)日：2021-01-19

申请号：US16098543

申请日：2017-04-19

Applicant: DENSO CORPORATION

Inventor： Keisuke Mizutani ,  Keigo Mizutani ,  Mitsunobu Nakato ,  Takashi Araki

IPC: G01N27/419 ,  G01N27/409

Abstract: Provided is a gas sensor improving accuracy of detection of specific gas in measurement gas, while maintaining high responsiveness in detection of the specific gas. A sensor element of a gas sensor includes a first solid electrolyte and second solid electrolyte having oxygen ionic conductivity, a measurement gas chamber into which measurement gas is introduced, a first reference gas chamber and second reference gas chamber into which reference gas is introduced, a first pump cell, a second pump cell, a sensor cell, and a heater. The sensor cell detects a specific gas component in the measurement gas having an oxygen concentration adjusted by the pump cells. The heater is located opposite to a second principal surface of the second solid electrolyte on which the sensor cell is formed.

公开(公告)号：US10890552B2

公开(公告)日：2021-01-12

申请号：US16061790

申请日：2016-12-07

Applicant: DENSO CORPORATION

Inventor： Keigo Mizutani ,  Keisuke Mizutani ,  Mitsunobu Nakato ,  Takashi Araki

IPC: G01N27/407 ,  G01N27/416 ,  G01N27/406 ,  G01N27/409 ,  G01N27/41 ,  G01N27/419

Abstract: A gas sensor includes a pump cell unit that regulates the oxygen concentration of a measured gas using a pump electrode, a monitor cell unit that detects the residual oxygen concentration of the measured gas using a monitor electrode, and a sensor cell unit that detects the concentration of a specific gas component in the measured gas using a sensor electrode. Between a pump electrode lead part and the sensor electrode, there is arranged the monitor electrode. Between an upstream portion of the pump electrode lead part and a monitor electrode lead part, there is provided an interval w1 of 0.5 mm or more.

公开(公告)号：US11878263B2

公开(公告)日：2024-01-23

申请号：US17487111

申请日：2021-09-28

Applicant: DENSO CORPORATION

Inventor： Keisuke Mizutani ,  Kazuhiko Koike ,  Mikio Ishihara

IPC: B01D46/24 ,  F01N3/022

CPC classification number: B01D46/2429 ,  B01D46/249 ,  B01D46/24492 ,  F01N3/022 ,  B01D2279/30 ,  F01N2330/06 ,  F01N2330/32

Abstract: An exhaust gas purification filter is configured to he disposed in an exhaust passage in a gasoline engine. The exhaust gas purification filter includes partition walls including a plurality of pores, a plurality of cells partitioned by the partition walls, and sealing portions alternately sealing ends of a plurality of the cells in the exhaust gas purification filter. The partition walls each have an average pore diameter of more than 16 μm and less than 21 μm, and have a ratio of an average surface opening diameter of the pores in a partition wall surface to the average pore diameter of the partition wall of 0.66 or more and 0.94 or less.

公开(公告)号：US10788448B2

公开(公告)日：2020-09-29

申请号：US16070601

申请日：2016-11-03

Applicant: DENSO CORPORATION

Inventor： Keigo Mizutani ,  Keisuke Mizutani ,  Mitsunobu Nakato ,  Takashi Araki

IPC: G01N27/417 ,  G01N27/407 ,  G01N27/409 ,  G01N33/00 ,  G01N27/419 ,  G01N27/41

Abstract: A gas sensor which can improve an accuracy in detecting a specific gas component by properly correcting for the influence of residual oxygen is provided. The gas sensor includes a solid electrolyte plate, a measured gas chamber into which a measured gas flows, a pump cell which adjusts an oxygen concentration of the measured gas using a pump electrode, a monitor cell which detects a residual oxygen concentration of the measured gas using a monitor electrode, and a sensor cell which detects a specific gas component concentration of the measured gas using a sensor electrode. The maximum thickness of the sensor electrode is greater than the maximum thickness of the monitor electrode, and the difference between the maximum thickness of the sensor electrode and the maximum thickness of the monitor electrode is between 4 μm and 30 μm, inclusive.

公开(公告)号：US10946369B2

公开(公告)日：2021-03-16

申请号：US16831947

申请日：2020-03-27

Applicant: DENSO CORPORATION

Inventor： Kazuhiko Koike ,  Keisuke Mizutani ,  Hiroaki Kayama

IPC: B01J35/04 ,  B01D46/24 ,  B01D53/94 ,  B01J23/42 ,  B01J23/44 ,  B01J23/46

Abstract: A honeycomb structure body has a skin part of a cylindrical shape and a honeycomb structural part formed with the skin part together in a monolithic body. The skin part and the honeycomb structural part have partition walls of a porous structure. The cells have first cells arranged adjacent to the skin part and second cells arranged adjacent to the first cells. The skin part, the first cells and the second cells form an outer peripheral section. A central section is arranged inside the outer peripheral section. The honeycomb structure body satisfies a relationship in which a thermal expansion coefficient of the outer peripheral section is greater than a thermal expansion coefficient of the central section.