公开(公告)号：US11782017B2

公开(公告)日：2023-10-10

申请号：US15742148

申请日：2016-07-04

Applicant: DENSO CORPORATION

Inventor： Mitsunobu Nakatou ,  Keigo Mizutani ,  Takashi Araki ,  Tadashi Nakamura

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

CPC classification number: G01N27/41 ,  G01N27/409 ,  G01N27/4074 ,  G01N27/4075 ,  G01N27/419

Abstract: On a cross sectional surface X1 of a pump electrode 3 in a gas sensor element forming a gas sensor, a noble metal area 31 having Pt—Au aggregations, a solid electrolyte area 32 having solid electrolyte aggregations, a mixture area in which Pt—Au alloy and solid electrolyte are distributed, and pores 34. The mixture area 33 is formed within a range of 30 to 90% in an overall area of the cross sectional surface X1, excepting the pores 34. The pores are formed adjacent to the mixture area 33.

公开(公告)号：US10732143B2

公开(公告)日：2020-08-04

申请号：US15850150

申请日：2017-12-21

Applicant: DENSO CORPORATION

Inventor： Hiroki Ichikawa ,  Yusuke Todo ,  Takashi Araki

IPC: G01N27/407 ,  G01N27/41

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：US10288580B2

公开(公告)日：2019-05-14

申请号：US15542219

申请日：2016-01-08

Applicant: DENSO CORPORATION

Inventor： Mitsunobu Nakatou ,  Kumi Sawaguchi ,  Keigo Mizutani ,  Takashi Araki

IPC: G01N27/417 ,  G01N27/403 ,  G01N27/30 ,  G01N27/407 ,  C22C5/04 ,  G01N27/12 ,  G01N27/41 ,  G01N33/00

Abstract: A NOx sensor is provided which decreases a change rate of an oxygen ion current in a sensor electrode and shortens an activation time of the sensor electrode. The NOx sensor is equipped with a solid electrolyte body, a pump electrode working to regulate an oxygen concentration in measurement gas G, and a sensor electrode working to measure the concentration of NOx in the measurement gas G. A metallic component of the sensor electrode is a Pt—Rh alloy. The mass ratio of Pt to Rh in the whole of the sensor electrode is Pt:Rh=70:30 to 35:65. The percentage of Rh in the Pt—Rh alloy in a surface layer of the sensor electrode is higher than that in the whole of the sensor electrode by an atomic composition percentage of 4 to 10 atom %.

公开(公告)号：US10088448B2

公开(公告)日：2018-10-02

申请号：US15109943

申请日：2015-01-19

Applicant: DENSO CORPORATION

Inventor： Mitsunobu Nakatou ,  Keigo Mizutani ,  Takashi Araki

IPC: G01N27/28 ,  G01N27/403 ,  G01N27/406 ,  G01N27/407 ,  G01N27/419 ,  G01N27/41

Abstract: Provided is a gas sensor element that can increase detection accuracy of a specific gas component concentration by means of a sensor cell by reflecting changes in the operating temperature of a gas sensor element. The gas sensor element is provided with a solid electrolyte body having oxygen ion conductivity, a heater stacked to the solid electrolyte body via a reference gas space, a pump cell adjusting oxygen concentration in a measuring gas space, a sensor cell detecting specific gas component concentration in the measuring gas space, and an electronic conduction detector cell detecting current resulting from electronic conduction due to the heater. The electronic conduction detector cell includes an electronic conductor electrode which is provided to a measuring gas side surface of the solid electrolyte body and covered with an insulator.

公开(公告)号：US20150276654A1

公开(公告)日：2015-10-01

申请号：US14443750

申请日：2013-11-18

Applicant: DENSO CORPORATION

Inventor： Takashi Araki

IPC: G01N27/403

CPC classification number: G01N27/403 ,  G01N27/4077

Abstract: A gas sensor 1 includes a sensor element 2, a housing 13 and an element cover 3. Gas introduction parts 271 are provided in the distal end portion 201 of the sensor element 2. The element cover 3 includes an inner cover 4 and an outer cover 5. The outer cover 5 is provided with outer introduction openings 52. The inner cover 4 is provided with inner introduction openings 42 and louver parts 44 each of which is folded from the end portion 421 at the axial distal end side X1 of the inner introduction opening 42 to the inside of the inner cover 4, and is formed toward the axial proximal end side X2. When the louver part 44 is projected onto the same plane as the inner introduction opening 42, a pair of lateral end edges of the louver part 44 are formed in approximately parallel to the louver forming direction heading from the base side to the distal end side of the louver part 44 and in a roughly linear shape.

Abstract translation: 气体传感器1包括传感器元件2，壳体13和元件盖3.气体导入部271设置在传感器元件2的前端部201中。元件盖3包括内盖4和外盖 外盖5设置有外部引入口52.内盖4设置有内引入开口42和百叶窗部分44，每个内引入开口42和百叶窗部分44在内引导件的轴向远端侧X1处从端部421折叠 开口42到内盖4的内侧，并且朝向轴向近端侧X2形成。 当百叶窗部分44投影到与内部引入开口42相同的平面上时，百叶窗部分44的一对横向端边缘形成为大致平行于从基部侧到远端侧的百叶窗形成方向 百叶窗部分44并且呈大致线形。

公开(公告)号：US11753981B2

公开(公告)日：2023-09-12

申请号：US17350151

申请日：2021-06-17

Applicant: DENSO CORPORATION

Inventor： Takashi Araki ,  Masato Katsuno

IPC: F01N11/00 ,  G01M15/10 ,  F01N13/00

CPC classification number: F01N11/002 ,  F01N13/008 ,  G01M15/102 ,  F01N2550/04 ,  F01N2550/22

Abstract: A particulate matter detecting apparatus (S) comprises a sensor body (S1) which has a sensor device (1) which is retained in a housing (H) secured to an exhaust pipe (101) of an internal combustion engine (ENG) and detects particulate matter contained in exhaust gas, a sensor temperature determining unit (2) which works to determine a temperature of the sensor device, and a mounted condition diagnosis unit (3) which diagnoses a mounted condition where the sensor body is mounted in the exhaust pipe. The mounted condition diagnosis unit includes a diagnosis threshold setting unit (31) and a mount error determining unit (32). The diagnosis threshold setting unit determines a diagnosis threshold (Tth), as used in a diagnosis of the mounted condition, as a function of an operating condition of the internal combustion engine to have a temperature value lower than a temperature of the sensor device when the sensor body is normally mounted in the exhaust pipe. When a sensor temperature (T), as determined by the sensor temperature determining unit, is lower than the diagnosis threshold, the mount error determining unit determines that an error in the mounted condition is occurring.

公开(公告)号：US11422069B2

公开(公告)日：2022-08-23

申请号：US16885648

申请日：2020-05-28

Applicant: DENSO CORPORATION

Inventor： Yuto Tamei ,  Takashi Araki ,  Hirofumi Noda ,  Takehito Kimata ,  Koichi Yoshida

IPC: G01N15/06 ,  G01N1/22 ,  G01N27/04 ,  G01N27/407 ,  G01D11/24

Abstract: A sensor device includes an element cover at the tip end of a housing, retaining a sensor element. An outer cover is provided with outer side holes, with the tip position of the outer side holes being farther toward the tip end than is the tip position of an inner cover, and a first flow passage having a gas flow direction that is at right angles to the axial direction is formed at the inner side of the outer cover. An inner side hole in the inner cover is open to a second flow passage provided between the side surfaces of the inner cover and the outer cover, and a detection surface of the sensor element is located on an extension line in an extension direction of a guide member which extends obliquely into the interior of the inner cover from the tip-position edge of the inner side hole.

公开(公告)号：US10996192B2

公开(公告)日：2021-05-04

申请号：US15759297

申请日：2016-09-09

Applicant: DENSO CORPORATION

Inventor： Takashi Araki ,  Takehito Kimata ,  Mitsunobu Nakatou

IPC: G01N27/407 ,  G01N27/406 ,  G01N27/41

Abstract: A gas sensor is equipped with a sensor element which detects a specific gas concentration within a gas that is being measured, a housing having the sensor element disposed in the interior thereof and retained therein, and an element cover disposed at an axial-direction tip end of the housing. The tip of the sensor element is provided with a gas introduction part. The element cover has an inner cover and an outer cover, with a space opened between the inner cover and outer cover. Inner side flow holes provided in the inner cover are disposed closer to an axial-direction base end than is a tapered-diameter step part. The distance between the tip of the sensor element and the inner-side flow holes of the inner cover, with respect to an axial direction, is less than or equal to 1.6 mm.

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：US10648381B2

公开(公告)日：2020-05-12

申请号：US15769794

申请日：2016-10-21

Applicant: DENSO CORPORATION

Inventor： Masayuki Tamura ,  Takashi Araki ,  Masahiro Yamamoto ,  Go Miyagawa ,  Manabu Yoshidome ,  Masato Katsuno ,  Toshihiro Sakawa

IPC: F01N3/023 ,  G01N27/04 ,  G01N15/06 ,  F01N3/00 ,  F02D41/14

Abstract: A particulate matter detecting device includes: an element unit on which particulate matter contained in exhaust gas from an internal combustion engine is deposited; a heater that heats the element unit; a detecting unit that detects the amount of particulate matter on the basis of electrical characteristics of the element unit; and a control unit that controls the operation of the heater. For a predetermined period that does not include a period in which the particulate matter is deposited on the element unit, the control unit operates the heater using a predetermined amount of control set in advance such that the temperature of the element unit is higher than the temperature of the exhaust gas and lower than a predetermined temperature at which the element unit is thermally degraded.