公开(公告)号：US11492950B2

公开(公告)日：2022-11-08

申请号：US17223579

申请日：2021-04-06

Applicant: DENSO CORPORATION

Inventor： Kensuke Takizawa ,  Toshihiko Harada ,  Hiroki Ichikawa

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

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：US11230960B2

公开(公告)日：2022-01-25

申请号：US16713787

申请日：2019-12-13

Applicant: DENSO CORPORATION

Inventor： Kensuke Takizawa ,  Kazuhiko Koike ,  Go Miyagawa

IPC: F01N11/00 ,  F02D41/02 ,  F02D41/14 ,  F02D41/06

Abstract: Failure detection apparatus for a particulate filter includes: a sensor having a particulate matter detection unit that outputs a signal corresponding to the amount of accumulated PM, and a heater unit that heats the particulate matter detection unit; a regeneration control unit that causes the heater unit to heat the particulate matter detection unit to a regeneration temperature allowing the particulate matter to be burned off; a start detection unit that determines the start of the internal combustion engine; failure determination unit that determines whether exhaust gas contains water droplets while the engine is in operation; a heating control unit that causes the heater unit to heat the particulate matter detection unit to a first temperature allowing the accumulated particulate matter to remain and the moisture included in the particulate matter to be removed; and failure determination unit that determines whether the filter has failure based on a sensor output value.

公开(公告)号：US11530665B2

公开(公告)日：2022-12-20

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：US10578518B2

公开(公告)日：2020-03-03

申请号：US15516163

申请日：2015-10-02

Applicant: DENSO CORPORATION

Inventor： Hironobu Shimokawa ,  Kazuhiko Koike ,  Kensuke Takizawa ,  Manabu Yoshidome ,  Masayuki Tamura

IPC: G01M15/10 ,  G01N15/02 ,  F02D41/14 ,  F02D41/02 ,  G01N15/06 ,  G01N1/22 ,  G01N35/00 ,  G01N27/04 ,  F01N3/021 ,  F01N11/00 ,  G01N15/08

Abstract: A control unit (6) estimates an output value of a PM sensor (S2) located at a downstream side of a DPF used as a reference filter, and detects whether the estimated output value exceeds a predetermined value (S3). When the estimated output value exceeds the predetermined value (YES in S3), the control unit detects an output value of the PM sensor (S4), and a heater heats the PM sensor (S5). The control unit detects an output value of the PM sensor (S6) after the PM sensor is heated, and calculates a change ratio of the output values of the PM sensor before and after heating (S7). The control unit estimates an average particle size of PM based on the calculated change ratio (S8), and detects whether the DPF has failed based on a comparison result of a corrected output value of the PM sensor with a threshold value.

公开(公告)号：US09718053B2

公开(公告)日：2017-08-01

申请号：US14820719

申请日：2015-08-07

Applicant: DENSO CORPORATION

Inventor： Yoichi Kadota ,  Tomohiko Nakanishi ,  Kensuke Takizawa

IPC: B01J35/04 ,  B01J23/63 ,  B01J23/10 ,  B01J35/00 ,  B01J37/02 ,  C04B38/00 ,  B01D53/94 ,  B01J35/02 ,  B01J37/00

CPC classification number: B01J35/04 ,  B01D53/9445 ,  B01D2255/102 ,  B01D2255/2065 ,  B01D2255/20707 ,  B01D2255/20715 ,  B01D2255/2092 ,  B01D2255/50 ,  B01J23/10 ,  B01J23/63 ,  B01J35/0006 ,  B01J35/002 ,  B01J35/023 ,  B01J37/0018 ,  B01J37/0045 ,  C04B38/0006 ,  Y02T10/22

Abstract: A porous honeycomb structure including multiple co-catalyst particles and multiple inorganic binder particles of smaller particle diameter than the co-catalyst particles. Each co-catalyst particle is comprised of a ceria-zirconia solid solution. The inorganic binder particles reside between the co-catalyst particles. In the honeycomb structure, an exposure fraction of the co-catalyst particles from the inorganic binder particles on a cross-section of the honeycomb structure is within a range of 3 to 10%.