公开(公告)号：US20190383768A1

公开(公告)日：2019-12-19

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

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：US20190025248A1

公开(公告)日：2019-01-24

申请号：US16070601

申请日：2016-11-03

Applicant: DENSO CORPORATION ,  SOKEN, INC.

Inventor： Keigo MIZUTANI ,  Keisuke MIZUTANI ,  Mitsunobu NAKATO ,  Takashi ARAKI

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

CPC classification number: G01N27/419 ,  G01N27/4072 ,  G01N27/409 ,  G01N27/41 ,  G01N33/0036

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：US20180202965A1

公开(公告)日：2018-07-19

申请号：US15742148

申请日：2016-07-04

Applicant: DENSO CORPORATION ,  KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO

Inventor： Mitsunobu NAKATOU ,  Keigo MIZUTANI ,  Takashi ARAKI ,  Tadashi NAKAMURA

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

CPC classification number: G01N27/41 ,  G01N27/4074 ,  G01N27/4075 ,  G01N27/409 ,  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：US20170045471A1

公开(公告)日：2017-02-16

申请号：US15305410

申请日：2015-04-01

Applicant: DENSO CORPORATION

Inventor： Eriko MAEDA ,  Keigo MIZUTANI ,  Takehito KIMATA ,  Yuusuke TOUDOU

IPC: G01N27/407 ,  G01N27/416

CPC classification number: G01N27/407 ,  G01N27/4074 ,  G01N27/416 ,  G01N27/419

Abstract: A NOx concentration measurement system has a NOx sensor, a detection section, a NH3 concentration estimation section and a calculation section. The NOx sensor measures a sum concentration c4 of a concentration of NOx (a concentration c1 of combustion derived NOx) in exhaust gas g, and a concentration of NO (concentration c3 of derived NO which has been derived from NH3) oxidized from NH3. The calculation section calculates the concentration c3 of derived NO by using a concentration c2 of NH3 contained in outside exhaust gas which is present around the NOx sensor, not inside of the NOx sensor, and at least one of an air fuel ratio A/F, a concentration of O2 and a concentration of H2O. The concentration c1 of the is calculated based on the sum concentration c4 and the concentration c3 of derived NO.

Abstract translation: NOx浓度测定系统具有NOx传感器，检测部，NH 3浓度推定部和运算部。 NOx传感器测量排气g中的NOx浓度（燃烧得到的NOx的浓度c1）和从NH 3氧化的NO（源自NH 3的NO的浓度c3）的浓度的总和浓度c4。 计算部使用NO x传感器周围的NO x传感器周围的NOx排出浓度c2，而不是NOx传感器内部，计算出导出的NO的浓度c3，空气燃料比A / F， O2浓度和H2O浓度。 基于总浓度c4和导出的NO的浓度c3计算浓度c1。

公开(公告)号：US20160320334A1

公开(公告)日：2016-11-03

申请号：US15105177

申请日：2014-12-16

Applicant: DENSO CORPORATION

Inventor： Mitsunobu NAKATOU ,  Keigo MIZUTANI ,  Takashi ARAKI ,  Yuusuke TOUDOU

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

CPC classification number: G01N27/419 ,  G01N27/4071 ,  G01N27/409 ,  G01N27/41 ,  G01N33/0036 ,  G01N33/0037 ,  Y02A50/245

Abstract: A gas sensor includes a solid electrolyte, a gas chamber, a reference gas chamber, a pump cell, a monitor cell, and a sensor cell. The gas chamber has a spatial width W0 constant in a width direction W orthogonal to the direction of flow of a gas in a position where the pump electrode, the monitor electrode, and the sensor electrode are provided on the solid electrolyte. An amount of shift ΔX1 of a central position O2 of a gap S in the width direction W between the monitor electrode and the sensor electrode from a central position O1 in the width direction of the pump electrode has relationship of ΔX1≦¼ W1 where the pump electrode has a width W1. In addition, positions ΔY1 of a of a side surface of the monitor electrode and of a side surface of the sensor electrode from the central position O1 in the width direction W of the pump electrode have relationship of ΔY1≦½ W1.

Abstract translation: 气体传感器包括固体电解质，气体室，参考气体室，泵室，监测单元和传感器单元。 气体室的宽度方向W的空间宽度W0与在固体电解质上设置有泵电极，监视电极和传感器电极的位置的气体的流动方向正交。 从泵电极的宽度方向的中心位置O1的监视电极和传感器电极之间的宽度方向W上的间隙S的中心位置O2的偏移量ΔX1与ΔX1≤1= W1相关联，其中泵 电极具有宽度W1。 此外，监视电极的侧表面的a和传感器电极的侧表面的距离中心位置O1在泵电极的宽度方向W上的位置ΔY1具有ΔY1≤1/ W1Wl的关系。

公开(公告)号：US20180364193A1

公开(公告)日：2018-12-20

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 ,  G01N27/409 ,  G01N27/41 ,  G01N27/419 ,  G01N27/416 ,  G01N27/406

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：US20170370874A1

公开(公告)日：2017-12-28

申请号：US15542219

申请日：2016-01-08

Applicant: DENSO CORPORATION

Inventor： Mitsunobu NAKATOU ,  Kumi SAWAGUCHI ,  Keigo MIZUTANI ,  Takashi ARAKI

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

CPC classification number: G01N27/4075 ,  C22C5/04 ,  G01N27/12 ,  G01N27/4076 ,  G01N27/41 ,  G01N33/0037 ,  Y02A50/245

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：US20160209354A1

公开(公告)日：2016-07-21

申请号：US14912989

申请日：2014-08-21

Applicant: DENSO CORPORATION

Inventor： Takashi ARAKI ,  Keigo MIZUTANI ,  Mitsunobu NAKATOU

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

CPC classification number: G01N27/419 ,  G01N27/4071 ,  G01N27/409 ,  G01N27/41

Abstract: A gas sensor is provided which constitutes a pump cell 3 and a sensor cell 5 using a single solid electrolyte body 2, a pump electrode 30, a sensor electrode 50, and a reference electrode 80 and is designed to decrease power consumed by a heater and permit a size thereof to be reduced. A ratio of a minimum distance L2 between the pump electrode 30 and the sensor electrode 50 to a thickness d of the solid electrolyte body 2 is set to be three or more, thereby enabling the gas sensor 1 to make the pump cell 3 and the sensor cell 5 using the single solid electrolyte body 2, the pump electrode 30, the sensor electrode 50, and the reference electrode 80. Only either of the gas chamber or the reference gas chamber is, therefore, located between the solid electrolyte body and the heater, thereby decreasing distances of the pump cell and the sensor cell to the heater. This facilitates the ease with which the heater heats up the pump cell and the sensor cell.

Abstract translation: 提供了构成泵电池3的气体传感器和使用单个固体电解质体2，泵电极30，传感器电极50和参考电极80的传感器单元5，并且被设计为降低加热器消耗的功率， 允许其尺寸减小。 将泵电极30和传感器电极50之间的最小距离L2与固体电解质体2的厚度d的比设定为3以上，由此能够使气体传感器1使泵电池3和传感器 因此，仅使用单个固体电解质体2，泵电极30，传感器电极50和参考电极80的电池5.因此，气体室或参考气体室中的任一个因此位于固体电解质体和加热器之间 从而减小泵电池和传感器单元到加热器的距离。 这有助于加热器加热泵电池和传感器电池的容易性。

公开(公告)号：US20220011257A1

公开(公告)日：2022-01-13

申请号：US17485962

申请日：2021-09-27

Applicant: DENSO CORPORATION

Inventor： Toshihiko HARADA ,  Keigo MIZUTANI ,  Hironobu SHIMOKAWA ,  Yusuke KAWAMOTO ,  Hiroki ICHIKAWA

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

Abstract: A sensor element of a gas sensor includes a solid electrolyte body, a first insulator, a gas chamber, a second insulator, a reference gas duct, a pump electrode, a sensor electrode, a reference electrode, and a shield layer. The shield layer is formed of an insulating ceramic material and covers a sensor-side electrode portion of the reference electrode, the sensor-side electrode portion being arranged to overlap the sensor electrode through the solid electrolyte body.

公开(公告)号：US20190227027A1

公开(公告)日：2019-07-25

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 ,  G01N27/407 ,  G01N27/41 ,  F01N13/00

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.