公开(公告)号：US10261045B2

公开(公告)日：2019-04-16

申请号：US15319128

申请日：2015-06-15

Applicant: DENSO CORPORATION

Inventor： Yuusuke Kawamoto ,  Yuusuke Toudou

IPC: G01N27/407 ,  G01N27/41 ,  G01N27/409 ,  G01N27/406

Abstract: A sensor structural body, which is formed by stacking a sensor element and a heater, has a sensor protruding portion that protrudes distalward from a holder. The sensor element includes a solid electrolyte body, a measured-gas space, a reference-gas space, a pump cell, a monitor cell and a sensor cell. A heat-generating portion of the heater is entirely arranged in the sensor protruding portion. The length L (in mm) of a formation region of the heat-generating portion and the length H (in mm) of the sensor protruding portion in a longitudinal direction, in which the sensor protruding portion protrudes from the holder, are set to be in a range that is enclosed by first to fourth reference lines X1, X2, X3 and X4 on a two-dimensional coordinate plane whose horizontal and vertical axes respectively indicate the lengths L and H. The first to the fourth reference lines X1-X4 respectively represent the relationships of H=L, H=20, H=−4.24L+42.71 and H=−4.24L+68.6.

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：US11035821B2

公开(公告)日：2021-06-15

申请号：US15515262

申请日：2015-10-01

Applicant: DENSO CORPORATION

Inventor： Yuusuke Toudou ,  Takehito Kimata ,  Yuusuke Kawamoto

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

Abstract: A gas concentration detection apparatus is provided with a measuring gas chamber, a solid electrolyte body, a pump cell, a sensor cell, a pump cell controller and a sensor cell detection section. The pump cell controller applies an elimination voltage to the pump cell at a start-up point, before a gas concentration is detected. The water in the measuring gas chamber is decomposed and hydrogen is generated by application of the elimination voltage. Oxygen occluded in a sensor electrode of the sensor cell is removed by the hydrogen.