公开(公告)号：US20180172623A1

公开(公告)日：2018-06-21

申请号：US15850173

申请日：2017-12-21

Applicant: DENSO CORPORATION

Inventor： Takashi ARAKI ,  Yusuke TODO

IPC: G01N27/407 ,  G01N27/419 ,  G01N27/409 ,  G01N27/406

CPC classification number: G01N27/4072 ,  G01N27/4067 ,  G01N27/4074 ,  G01N27/409 ,  G01N27/41 ,  G01N27/417 ,  G01N27/419

Abstract: A gas sensor device is equipped with a diffusion controlling portion, a pump cell, and a sensor cell. The diffusion controlling portion is formed to face a major surface of a solid electrolyte body and works to control a rate of diffusion of a measurement gas entering a measurement gas chamber. The pump cell has a pump electrode which contains gold and is formed on the major surface. The pump electrode is located downstream of the diffusion controlling portion in a gas flow direction. The pump cell works to regulate a concentration of oxygen in the measurement gas upon application of voltage to the pump electrode. The sensor cell has a sensor electrode formed on the major surface downstream of the diffusion controlling portion in the gas flow direction. The sensor cell works to measure a concentration of nitrogen oxide contained in the measurement gas upon application of voltage to the sensor electrode. The pump electrode is disposed upstream of the sensor electrode at a distance of 0.2 mm or more downstream away from the diffusion controlling portion in the gas flow direction. This enhances the accuracy in measuring the concentration of NOx.

公开(公告)号：US20210088472A1

公开(公告)日：2021-03-25

申请号：US17110634

申请日：2020-12-03

Applicant: DENSO CORPORATION

Inventor： Yusuke KAWAMOTO ,  Yusuke TODO ,  Hiroo IMAMURA ,  Mitsunobu NAKATO

IPC: G01N27/419 ,  G01N27/407 ,  G01N27/417 ,  G01N33/00

Abstract: A gas sensor, an oxygen concentration measuring unit, and a computation unit are included. The gas sensor measures a concentration CNOX of specific gas contained in measured gas. The oxygen concentration measuring unit measures a concentration CO2 of oxygen in the measured gas outside the gas sensor. The gas sensor has a measured gas chamber, a reference gas chamber, a diffusion resistance unit, a pump cell, and a sensor cell. The computation unit computes a concentration CNOX of the specific gas by using the concentration CO2 of oxygen measured by using the oxygen concentration measurement unit and the sensor current.

公开(公告)号：US20190004008A1

公开(公告)日：2019-01-03

申请号：US16062879

申请日：2016-12-09

Applicant: DENSO CORPORATION

Inventor： Yusuke TODO ,  Mitsunobu NAKATO ,  Hiroki ICHIKAWA

IPC: G01N27/419 ,  G01N27/407 ,  G01N27/404 ,  G01N33/00

Abstract: A gas sensor element including a solid electrolyte body, a sensor electrode, and a reference electrode is provided. The solid electrolyte body has oxygen ion conductivity and includes a measurement gas surface to be exposed to a measurement gas introduced from the exterior and a reference gas surface to be exposed to a reference gas introduced from the exterior. The sensor electrode is provided on the measurement gas surface of the solid electrolyte body. The reference electrode is provided on the reference gas surface of the solid electrolyte body. The sensor electrode includes a porous body containing a solid electrolyte having oxygen ion conductivity and a precious metal, the peak pore size of the sensor electrode being 0.03 μm to 0.3 μm.

公开(公告)号：US20200224600A1

公开(公告)日：2020-07-16

申请号：US16832521

申请日：2020-03-27

Applicant: DENSO CORPORATION

Inventor： Yuki MURAYAMA ,  Ryozo KAYAMA ,  Yusuke TODO ,  Manabu YOSHIDOME

IPC: F02D41/14 ,  F01N11/00

Abstract: It is to determine whether a temperature rise condition of a first cell or a second cell is satisfied based on whether a first parameter has exceeded a predetermined first threshold or a second parameter has exceeded a predetermined second threshold. After satisfaction of the temperature rise condition, it is to determine that an exhaust gas sensor is in an active state upon determination that a corresponding time condition is satisfied.

公开(公告)号：US20180017520A1

公开(公告)日：2018-01-18

申请号：US15650017

申请日：2017-07-14

Applicant: DENSO CORPORATION

Inventor： Yusuke TODO ,  Mitsunobu NAKATO ,  Hiroaki YOTO ,  Hiroki ICHIKAWA

IPC: G01N27/417 ,  C22C5/04 ,  G01N27/419 ,  G01N27/30

CPC classification number: G01N27/417 ,  C22C5/04 ,  G01N27/304 ,  G01N27/4073 ,  G01N27/419

Abstract: A gas sensor includes a sensor element. The sensor element includes; a solid electrolyte body that has oxygen ion conductivity and includes a first main surface exposed to a gas to be measured and a second main surface exposed to a reference gas; a sensor electrode that is provided on the first main surface and detects a specific gas component in the gas to be measured; and a reference electrode that is provided on the second main surface. The sensor electrode is made of a Pt—Rh alloy that contains 30 mass % to 70 mass % Pt and 70 mass % to 30 mass % Rh, when an overall noble metal component is 100 mass %. A variation amount of the Rh content of the Pt—Rh alloy from an outermost surface to a depth of 350 nm in a thickness direction of the sensor electrode is within a range of up to 10 mass %.

公开(公告)号：US20210255137A1

公开(公告)日：2021-08-19

申请号：US17313320

申请日：2021-05-06

Applicant: DENSO CORPORATION

Inventor： Tatsuya YOSHIKAWA ,  Yusuke TODO ,  Mitsunobu NAKATO ,  Takashi ARAKI ,  Yuji KAWASAKI

IPC: G01N27/417 ,  G01N27/407

Abstract: A gas sensor includes a sensor element including a solid electrolyte, a gas chamber, a pump electrode, a sensor electrode, and a reference electrode. The pump electrode and sensor electrode are provided in the solid electrolyte in a state in which the pump electrode and the sensor electrode are housed in the gas chamber. The reference electrode is provided in the solid electrolyte. The pump electrode and the sensor electrode contain Au. Au content in a surface layer is equal to or greater than 1 mass % and higher than Au content in a reference layer. The surface layer is an area from a surface of the sensor electrode to a depth of 0.3 nanometers. The reference layer is an area extending to a depth of 2 or more to 3 or less nanometers from the surface of the sensor electrode.

公开(公告)号：US20200224575A1

公开(公告)日：2020-07-16

申请号：US16832433

申请日：2020-03-27

Applicant: DENSO CORPORATION

Inventor： Yuki MURAYAMA ,  Ryozo KAYAMA ,  Yusuke TODO ,  Manabu YOSHIDOME

IPC: F01N11/00 ,  G01N27/41 ,  C25B1/04

Abstract: A microcomputer includes a voltage application unit that selectively applies a normal voltage and a removal voltage higher than the normal voltage to a first cell of the exhaust gas sensor. The first cell is configured to remove, based on the removal voltage, oxygen in an exhaust gas from an internal combustion engine. The microcomputer includes an element temperature measurement unit that measures an element temperature parameter indicative of a temperature of the first cell. The microcomputer includes a termination determination unit that determines, based on the element temperature parameter, a termination time of terminating the application of the removal voltage to the first cell by the voltage application unit.

公开(公告)号：US20180172626A1

公开(公告)日：2018-06-21

申请号：US15848321

申请日：2017-12-20

Applicant: DENSO CORPORATION

Inventor： Yusuke TODO ,  Mitsunobu NAKATO ,  Hiroaki YOTO

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

CPC classification number: G01N27/419 ,  G01N27/4071 ,  G01N27/4074 ,  G01N27/4075 ,  G01N27/409 ,  G01N27/41 ,  G01N33/0036

Abstract: A gas sensor element of the present disclosure includes a measurement gas chamber, a solid electrolyte body, and a sensor electrode. The sensor electrode has a noble metal region which contains at least Rh and Pt, an electrolyte region which is formed by a solid electrolyte, and a mixed region in which the noble metal and the solid electrolyte are mixed. With respect to a correlation curve which represents a correlation between a mass percentage concentration c of Rh and a thickness d of the mixed region, when a reaction resistance to a measured gas in the sensor electrode is 40 kΩ, the concentration c of Rh and the thickness d are set so that at coordinates (c, d), the concentration c has a positive coordinate point and the thickness d has a positive coordinate point.

公开(公告)号：US20180172625A1

公开(公告)日：2018-06-21

申请号：US15850150

申请日：2017-12-21

Applicant: DENSO CORPORATION

Inventor： Hiroki ICHIKAWA ,  Yusuke TODO ,  Takashi ARAKI

IPC: G01N27/41 ,  G01N27/407

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.