公开(公告)号：US10393696B2

公开(公告)日：2019-08-27

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 ,  G01N27/403 ,  G01N27/30 ,  C22C5/04 ,  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：US11209387B2

公开(公告)日：2021-12-28

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 ,  G01N33/00 ,  G01N27/404 ,  G01N27/416 ,  G01N27/406

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：US11092099B2

公开(公告)日：2021-08-17

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 ,  G01N27/41 ,  G01M15/10

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：US11035283B2

公开(公告)日：2021-06-15

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 ,  C25B1/04 ,  G01N27/40 ,  G01N27/41 ,  G01N27/406

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：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：US10935517B2

公开(公告)日：2021-03-02

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

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.