公开(公告)号：US10393694B2

公开(公告)日：2019-08-27

申请号：US14646137

申请日：2013-11-18

Applicant: DENSO CORPORATION

Inventor： Yuusuke Endo ,  Takashi Araki

IPC: G01N27/407 ,  G01M15/10 ,  G01N33/00

Abstract: A gas sensor 1 includes a sensor element 2, a housing 13 and an element cover 3. The sensor element 2 is provided with a gas introduction part 271 for introducing a measurement gas thereinto at a distal end portion 201 thereof. The element cover 3 includes an inner cover 4 disposed so as to cover the distal end portion 201 of the sensor element 2 and an outer cover disposed outside the inner cover 4. The outer cover 5 is provided with outer inlet openings 52 for introducing the measurement gas into the outer cover 5. The inner cover 4 is provided with inner inlet openings 42 for introducing the measurement gas into the inner cover 4. The axial intermediate position C1 of the gas introduction part 271 of the sensor element 2 is more to the axial proximal end side X2 than the axial proximal end position D1 of the inner inlet opening 42 of the inner cover 4.

公开(公告)号：US10088446B2

公开(公告)日：2018-10-02

申请号：US15315738

申请日：2015-06-04

Applicant: DENSO CORPORATION

Inventor： Takashi Araki ,  Keigo Mizutani

IPC: G01N27/41 ,  G01N27/407 ,  G01N27/416 ,  G01M15/10

Abstract: A gas sensor device is equipped with a pump cell and a sensor cell. The pump cell works to regulate the concentration of oxygen in a measurement gas space. The sensor cell works to measure an oxygen ion current flowing between a sensor electrode and a reference electrode. The gas sensor device is designed to subtract the oxygen ion current value I2, as measured by the sensor cell a given period of time after spraying of fuel into the internal combustion engine is interrupted, from the oxygen ion current value I1, as measured by the sensor cell when the fuel is being sprayed into the internal combustion engine, to derive the concentration of a given gas component based on the corrected oxygen ion current value I. This results in improved accuracy in determining the concentration of the given gas component.

公开(公告)号：US11927120B2

公开(公告)日：2024-03-12

申请号：US17237248

申请日：2021-04-22

Applicant: DENSO CORPORATION

Inventor： Takashi Araki ,  Masato Katsuno

IPC: F01N3/00 ,  F01N3/023 ,  F01N11/00 ,  F01N13/00

CPC classification number: F01N11/00 ,  F01N3/023 ,  F01N13/008 ,  F01N2560/02 ,  F01N2560/20

Abstract: An exhaust gas sensor includes an element cover, a heater, a heater control section, and a cover state diagnosing section. The element cover accommodates a sensor element including a detection section and includes one or more gas flow holes. The heater heats the sensor element. The heater control section controls how the heater heats the sensor element. The cover state diagnosing section diagnoses a state of the element cover using heater information obtained when the heater is operated by the heater control section. The cover state diagnosing section includes a diagnosability determining section, which determines whether the state of the element cover is diagnosable based on an accuracy of the heater information obtained from an operating state of the heater and a surrounding environmental state of the element cover.

公开(公告)号：US11448574B2

公开(公告)日：2022-09-20

申请号：US16885636

申请日：2020-05-28

Applicant: DENSO CORPORATION

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

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

Abstract: A sensor device is equipped with a housing having an element cover retaining a sensor element such that a detection section of the sensor element is positioned at the tip end of the sensor element. The element cover includes an inner cover provided with inner side holes and an inner tip face hole respectively provided therein, and an outer cover provided with outer side holes in a side thereof, with the tip position of the outer side holes located closer to the tip end than is the tip position of the inner cover. Between the outer surface of the inner cover and the inner surface of the outer cover there is a large clearance section at the tip end and a small clearance section at the base end, providing a flow path that is shaped for connecting the large clearance section and the small clearance section without a step.

公开(公告)号：US10921283B2

公开(公告)日：2021-02-16

申请号：US15105177

申请日：2014-12-16

Applicant: DENSO CORPORATION

Inventor： Mitsunobu Nakatou ,  Keigo Mizutani ,  Takashi Araki ,  Yuusuke Toudou

IPC: G01N27/41 ,  G01N27/419 ,  G01N33/00 ,  G01N27/407 ,  G01N27/406 ,  G01N27/409

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.

公开(公告)号：US10794811B2

公开(公告)日：2020-10-06

申请号：US15769797

申请日：2016-10-20

Applicant: DENSO CORPORATION

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

IPC: G01N15/06 ,  F01N11/00 ,  F01N3/023 ,  F01N13/00

Abstract: An apparatus which detects particulate matter is provided. This apparatus estimates a volume of water inside an exhaust passage using estimation sections. When an estimated volume of water is larger than a water drainage threshold, an element portion is heated using a heater by the first temperature range controller, in a temperature range which resists water-induced cracking independent of a volume of water droplets. If the estimated volume of water is less than a water drainage threshold, the water drainage determination section determines that the water drainage of the exhaust passage is completed. Additionally, if it is estimated that the water drainage is completed, the element portion is heated by a second temperature controller at temperature lower than a starting temperature of combustion of particulate matter and in order to repel water adhered onto the element portion in a water-repellent temperature range for a predetermined period.

公开(公告)号：US11933757B2

公开(公告)日：2024-03-19

申请号：US15521967

申请日：2015-10-20

Applicant: DENSO CORPORATION

Inventor： Yuusuke Kawamoto ,  Yuusuke Toudou ,  Takashi Araki

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

CPC classification number: G01N27/41 ,  G01N27/4067 ,  G01N27/4077 ,  G01N27/4078

Abstract: A gas sensor is equipped with a housing, an insulator retained by an inner periphery of the housing, a sensing device having a front end portion protruding from a front end surface of the insulator, and a protective cover which covers a front end portion of the sensing device. A pump electrode and a sensor electrode are disposed in a front end portion of the solid electrolyte body. The pump electrode is exposed to a measurement gas and regulates the concentration of oxygen in the measurement gas. The sensor electrode is exposed to the measurement gas and measures the concentration of a given gas component in the measurement gas after being regulated in concentration of oxygen by the pump electrode. A base end portion of the sensor electrode in a lengthwise direction is located closer to a base end side of the gas sensor than a front end surface of the housing is. This minimizes a variation in temperature of the sensor electrode and enhances the accuracy in measuring the concentration of the given gas component.

公开(公告)号：US10895553B2

公开(公告)日：2021-01-19

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 ,  G01N27/409

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：US10890552B2

公开(公告)日：2021-01-12

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

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：US10036724B2

公开(公告)日：2018-07-31

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 ,  G01N27/407

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.