公开(公告)号：US11619154B2

公开(公告)日：2023-04-04

申请号：US17454323

申请日：2021-11-10

Applicant: DENSO CORPORATION

Inventor： Hirokatsu Imagawa

IPC: F01N3/022

Abstract: In an exhaust gas purification filter, a partition wall has communicating pores. Each communicating pore has a surface opening on the gas-inflow-side surface and a plurality of portions, each portion having a diameter being reduced and then increased from the surface opening, one of the portions, whose diameter is the smallest, being defined as an inlet neck portion. As viewed in cross section in a thickness direction of the partition wall, the surface opening of each communication pore has a diameter defined as a surface opening diameter, the inlet neck portion of each communication pore has a diameter defined as an inlet neck diameter. The inlet neck diameter is smaller than the surface opening diameter, and an average value of the inlet neck diameters is 15 μm or less. A surface opening ratio of the communicating pores in plan view of the gas-inflow-side partition wall surface is 40% or more.

公开(公告)号：US10905992B2

公开(公告)日：2021-02-02

申请号：US16337520

申请日：2017-09-26

Applicant: DENSO CORPORATION

Inventor： Hirokatsu Imagawa ,  Hironori Niwa

IPC: B01D46/24 ,  B01D46/00 ,  B01D53/94 ,  B28B3/26 ,  B01J35/04 ,  F01N3/28 ,  B01D39/20 ,  F01N3/022 ,  B28B11/24 ,  B28B3/20

Abstract: A honeycomb structural body includes: a porous cell wall that partitions a cylindrical casing; and a large number of cells extending in the axial direction X thereof and alternately blocked at an upstream end face. The large number of cells include plugged cells having plugs and penetrating cells that do not have the plugs. The plugged cells and the penetrating cells both include complete cells and incomplete cells. At least some of plugged incomplete cells of the incomplete cells have a cross-sectional area smaller than a cross-sectional area of penetrating complete cells, and are configured as blocked cells that are entirely blocked inside in the axial direction.

公开(公告)号：US10208643B2

公开(公告)日：2019-02-19

申请号：US15319541

申请日：2015-06-12

Applicant: DENSO CORPORATION

Inventor： Go Miyagawa ,  Hirokatsu Imagawa ,  Masayuki Tamura

IPC: F01N11/00 ,  G01N15/06 ,  F01N3/021 ,  G01N27/04 ,  F02D41/06 ,  F02D41/14 ,  F02D41/22 ,  G01N15/00

Abstract: A particulate matter detection apparatus includes a particulate matter quantity detection means, a temperature detection means that detects the temperature of exhaust gas, a control unit and a heating means. The particulate matter quantity detection means includes a particulate matter deposition portion that deposits thereon part of particulate matter contained in the exhaust gas emitted from an internal combustion engine and a pair of opposite electrodes arranged apart from each other on the particulate matter deposition portion. The control unit determines a deposition quantity of the particulate matter on the particulate matter deposition portion based on an electrical signal outputted by the particulate matter quantity detection means and receives information on the temperature of the exhaust gas detected by the temperature detection means. The control unit controls the heating means to heat the particulate matter deposition portion to 300° C.-800° C. during a cold start of the internal combustion engine.

公开(公告)号：US11850540B2

公开(公告)日：2023-12-26

申请号：US17507020

申请日：2021-10-21

Applicant: DENSO CORPORATION

Inventor： Hirokatsu Imagawa

IPC: B01D46/24

CPC classification number: B01D46/2429 ,  B01D46/24491 ,  B01D46/24492 ,  B01D2275/30 ,  B01D2279/30

Abstract: An exhaust gas purification filter includes a plurality of cells each extending from an inflow end face to an outflow end face, a porous partition wall forming the cells in a partitioned manner, inflow-side sealing parts sealing openings on an inflow end face side of outflow cells where the exhaust gas flows out, and outflow-side sealing parts sealing openings on an outflow end face side of inflow cells where the exhaust gas flows in. Each of the inflow-side sealing parts has a porosity of less than 60%. The partition wall has a porosity of 60% or more and 70% or less. Assuming a pore size, at which cumulative pore volume is 50% in pore size distribution of the inflow-side sealing parts, is d50Pin, and a pore size, at which cumulative pore volume is 50% in pore size distribution of the partition wall, is d50B, the pore size d50Pin is less than 18 μm, and the pore size d50B is 18 μm or more and 25 μm or less.

公开(公告)号：US11231354B2

公开(公告)日：2022-01-25

申请号：US16687737

申请日：2019-11-19

Applicant: DENSO CORPORATION

Inventor： Kazuhiko Koike ,  Hirokatsu Imagawa

IPC: G01N7/00 ,  G01N15/06 ,  G01M15/10 ,  G01N15/00

Abstract: A method of manufacturing a particulate matter detection element for detecting particulate matter in a gas to be measured includes manufacturing flat-shaped conductor layers, flat-shaped insulating layers, a laminated structure in which the conductor layers and the insulating layers are alternately laminated, and a detecting unit having the conductor layers of different polarities as a pair of detection electrodes on a cross section of the laminated structure. The conductor layers each have a constant thickness, and include conductor layer planar portions having a stripped-pattern cross section, and tapered conductor layer end edge portions each having a triangular cross section, provided on both sides of the respective conductor layer planar portions.

公开(公告)号：US10520415B2

公开(公告)日：2019-12-31

申请号：US15110447

申请日：2015-01-09

Applicant: DENSO CORPORATION

Inventor： Kazuhiko Koike ,  Hirokatsu Imagawa

IPC: G01N37/00 ,  G01N15/06 ,  G01M15/10 ,  G01N15/00

Abstract: A particulate matter detection element for detecting particulate matter in a gas to be measured includes flat-shaped conductor layers, flat-shaped insulating layers, a laminated structure in which the conductor layers and the insulating layers are alternately laminated, and a detecting unit having the conductor layers of different polarities as a pair of detection electrodes on a cross section of the laminated structure. The conductor layers each have a constant thickness, and include conductor layer planar portions having a stripped-pattern cross section, and tapered conductor layer end edge portions each having a triangular cross section, provided on both sides of the respective conductor layer planar portions.