公开(公告)号：US20210270200A9

公开(公告)日：2021-09-02

申请号：US16860361

申请日：2020-04-28

Applicant: DENSO CORPORATION ,  TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Toru TAKEUCHI ,  Tomotaka MORI ,  Shota IMADA ,  Yoshiharu MIYAKE ,  Hiroki NISHIJIMA ,  Haruki KONDO ,  Yasushi HIRATA

IPC: F02D41/14 ,  G01N27/407

Abstract: A gas sensor includes a sensor element body having a porous layer provided on an outer surface, and a power supply device which supplies power to a heater element that is in the sensor element body. The amount of power being applied to the heater element by the power supply device when gas detection is being performed by the gas sensor in a steady state is designated as P [W], the volume of the length range of a heating region of the heater element provided in the sensor element body as V [mm3], and the applied power density as X [W/mm3], where X is a value expressed by P/V. In that case, the following relationship is satisfied between the applied power density X and the average thickness Y [μm] of the porous layer: Y≥509.32−2884.89X+5014.12X2

公开(公告)号：US20200182182A1

公开(公告)日：2020-06-11

申请号：US16786135

申请日：2020-02-10

Applicant: DENSO CORPORATION

Inventor： Shota IMADA ,  Tomotaka MOURI ,  Toru TAKEUCHI

IPC: F02D41/14 ,  G01N33/00

Abstract: A gas sensor element comprising a long plate-like element body and a porous protective layer protecting a surface of the element body, wherein the element body has a gas detection part at an end thereof on one end face side in a longitudinal direction, and the protective layer includes an end face part covering the one end face in laminate, side face parts covering side faces connected to the one end face in laminate, and corner parts where two adjacent ones of the end face part and the side face parts meet. An outer surface of one or more of the end face part and the side face parts has a concave shape that is smoothly continuous with the corner parts and configured such that a layer thickness increases toward the corner parts.

公开(公告)号：US20220018803A1

公开(公告)日：2022-01-20

申请号：US17485904

申请日：2021-09-27

Applicant: DENSO CORPORATION

Inventor： Kei SUGIURA ,  Toru TAKEUCHI

IPC: G01N27/407 ,  G01N27/406 ,  G01N27/409 ,  B01D53/02

Abstract: A gas sensor includes a sensor element that has an atmospheric-air introduction path into which atmospheric air is introduced. The sensor element includes a solid electrolyte body, an insulating body, an exhaust electrode, and an atmosphere electrode. The solid electrolyte body has ion conductivity. The insulating body is laminated onto the solid electrolyte body. The exhaust electrode is provided in the solid electrolyte body and exposed to an exhaust gas. The atmosphere electrode is provided in a position that opposes the exhaust electrode in the solid electrolyte body. The atmosphere electrode is used so as to be paired with the exhaust electrode, and is exposed to atmospheric air. The atmospheric-air introduction path is formed to house the atmosphere electrode in a section of the insulating body that opposes the solid electrolyte body. The atmospheric-air introduction path is provided with a trap layer for capturing toxic substances in the sensor element.

公开(公告)号：US20200256270A1

公开(公告)日：2020-08-13

申请号：US16860361

申请日：2020-04-28

Applicant: DENSO CORPORATION ,  TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Toru TAKEUCHI ,  Tomotaka MORI ,  Shota IMADA ,  Yoshiharu MIYAKE ,  Hiroki NISHIJIMA ,  Haruki KONDO ,  Yasushi HIRATA

IPC: F02D41/14 ,  G01N27/407

Abstract: A gas sensor includes a sensor element body having a porous layer provided on an outer surface, and a power supply device which supplies power to a heater element that is in the sensor element body. The amount of power being applied to the heater element by the power supply device when gas detection is being performed by the gas sensor in a steady state is designated as P [W], the volume of the length range of a heating region of the heater element provided in the sensor element body as V [mm3], and the applied power density as X [W/mm3], where X is a value expressed by P/V. In that case, the following relationship is satisfied between the applied power density X and the average thickness Y [μm] of the porous layer: Y≥509.32−2884.89X+5014.12X2

公开(公告)号：US20200173957A1

公开(公告)日：2020-06-04

申请号：US16786082

申请日：2020-02-10

Applicant: DENSO CORPORATION

Inventor： Tomotaka MOURI ,  Shota IMADA ,  Toru TAKEUCHI

IPC: G01N27/407 ,  G01N27/409 ,  G01N27/406

Abstract: A gas sensor element for detecting a specific gas component in a measured gas, comprising: an element body in the form of a long plate having a gas detection part at an end thereof on a distal end face side in a longitudinal direction; and a porous protective layer covering an outer periphery of the end on said end face side of the element body, wherein in a cross section including two adjacent ones of the end face and side faces connected to the end face, an outer surface of the protective layer facing an element corner where the two faces meet has a shape with a corner part, and a ratio of an assumed diameter of a water droplet contained in the measured gas in a use environment to an effective length of the corner part in the cross section is equal to or larger than 1.5.

公开(公告)号：US20190242848A1

公开(公告)日：2019-08-08

申请号：US16256680

申请日：2019-01-24

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA ,  DENSO CORPORATION

Inventor： Hiroki NISHIJIMA ,  Yoshiharu MIYAKE ,  Haruki KONDO ,  Yasushi HIRATA ,  Hirofumi SUZUKI ,  Kei SUGIURA ,  Toru TAKEUCHI

IPC: G01N27/407 ,  G01N27/409 ,  G01N27/406

CPC classification number: G01N27/4077 ,  G01N27/4067 ,  G01N27/4071 ,  G01N27/4075 ,  G01N27/409

Abstract: The present disclosure provides a gas sensor element comprising a porous protective layer with improved water repellency upon continuously water pouring, which is a gas sensor element comprising: a detection portion; and a porous protective layer formed around the detection portion, wherein the porous protective layer is formed from an aggregate containing alumina and a coating material containing silica, and in the porous protective layer, the weight concentration x % by weight of the coating material with respect to the total weight of the aggregate and the coating material, and the porosity y %, satisfy the following formula (1): y≤0.0058x2-1.2666x+68  (1), and in the porous protective layer, the pore volume of pores having a pore diameter of 100 nm or less is 0.02 mL/g or less.