公开(公告)号：US20180017514A1

公开(公告)日：2018-01-18

申请号：US15545864

申请日：2016-02-12

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA ,  DENSO CORPORATION

Inventor： Tetsuya KATO ,  Satoshi NAKAMURA ,  Hiroki NISHIJIMA ,  Makoto ITO

IPC: G01N27/12 ,  G01N27/41 ,  G01M15/10 ,  G01N27/407 ,  G01N33/497 ,  G01N33/00

CPC classification number: G01N27/125 ,  G01M15/104 ,  G01N27/4067 ,  G01N27/4072 ,  G01N27/4077 ,  G01N27/41 ,  G01N33/0036 ,  G01N33/0047 ,  G01N33/497

Abstract: A gas sensor element with suppressed response deterioration even when poisoned with S when fuel or exhaust gas contains ethanol and the ethanol content is high. The element includes a detection portion, which includes a solid electrolyte layer having a pair of electrodes on opposite sides thereof, a shielding layer defining a measurement target gas space with a porous diffusive resistance layer, and a reference gas space protective layer; a heat-generating portion stacked on the detection portion; and a porous protective layer surrounding the detection portion and heat-generating portion. The porous protective layer includes a first porous protective layer surrounding at least the porous diffusive resistance layer, and a second porous protective layer surrounding the first porous protective layer, the detection portion and the heat-generating portion. The first porous protective layer contains none of La, Ca, or Mg, while the second porous protective layer contains at least one of them.

公开(公告)号：US20170108463A1

公开(公告)日：2017-04-20

申请号：US15322781

申请日：2015-06-30

Applicant: DENSO CORPORATION

Inventor： Norikazu KAJIYAMA ,  Makoto ITO ,  Yasufumi SUZUKI

IPC: G01N27/407 ,  G01N27/406

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

Abstract: A gas sensor is provided which has a rapid heating property and which can detect A/F ratio with high accuracy and can detect specifically a stoichiometric environment with high accuracy. The gas sensor has a limiting current type gas sensor element. The gas sensor element has a cup-shaped solid electrolyte, a reference electrode formed on an inside surface of the solid electrolyte, a measuring electrode formed on an outside surface of the solid electrolyte and a heater. The heater is disposed inside the solid electrolyte so that a tip end thereof contacts the inside surface of the solid electrolyte. The gas sensor outputs the limiting current value depending on an oxygen concentration in exhaust gases by applying a predetermined voltage between the reference electrode and the measuring electrode. The measuring electrode, which a length thereof in a direction is 0.5 mm to 3.0 mm, is housed in a range 0.5 mm to 7.5 mm from a tip end of the solid electrolyte in the direction.

公开(公告)号：US20190391109A1

公开(公告)日：2019-12-26

申请号：US16451285

申请日：2019-06-25

Applicant: DENSO CORPORATION

Inventor： Shota HAGINO ,  Masatoshi IKEDA ,  Makoto ITO ,  Zhenzhou SU ,  Hao WU ,  Takashi HIRAYAMA ,  Daisuke KAWAI ,  Satoshi NAKAMURA

IPC: G01N27/407 ,  G01N27/409

Abstract: A gas sensor is equipped with a sensor device made of a stack of a solid electrolyte body, a sensor electrode, a reference electrode, a first insulator, a second insulator, a gas chamber, a reference gas duct, a heater, and a heat transfer member. The heater has a heating element at least partially overlapping the sensor electrode and the reference electrode. The heat transfer member is made of a dense metallic oxide material which blocks passage of measurement gas therethrough. The heat transfer member is held between the sensor electrode and the first insulator in which the heater is embedded within the gas chamber and works to facilitate transfer of thermal energy, as generated by the heater, to the solid electrolyte body, the sensor electrode, and the reference electrode. This results in enhanced thermal conductivity of the sensor device and achieves quick activation of the sensor device.

公开(公告)号：US20210181140A1

公开(公告)日：2021-06-17

申请号：US17181212

申请日：2021-02-22

Applicant: DENSO CORPORATION

Inventor： Masatoshi IKEDA ,  Shota HAGINO ,  Makoto ITO ,  Daisuke KAWAI

IPC: G01N27/406 ,  G01N27/407 ,  G01N27/409 ,  H05B3/03 ,  H05B3/18

Abstract: A gas sensor element has an electrolyte layer, a first insulator, a second insulator, a measurement gas chamber, and a reference gas chamber. The electrolyte layer includes a holding plate and a solid electrolyte body. The first insulator is laminated on one side of the electrolyte layer, and the second insulator is laminated on the other side of the electrolyte layer. At least a part of the boundary portion between the placement hole and the solid electrolyte body is sandwiched between a first sandwiching portion of the first insulator and a second sandwiching portion of the second insulator.

公开(公告)号：US20190049404A1

公开(公告)日：2019-02-14

申请号：US16079119

申请日：2016-12-14

Applicant: DENSO CORPORATION

Inventor： Masatoshi IKEDA ,  Makoto ITO

IPC: G01N27/41 ,  G01N27/416 ,  G01N27/409 ,  G01N27/30

Abstract: A gas sensor element includes a solid electrolyte plate, and a measurement electrode and a reference electrode provided on surfaces of the solid electrolyte plate. In a section plane of the reference electrode along a thickness direction, noble metal regions, solid electrolyte regions, mixed regions, and void spaces are present. When a ratio of an area B of the mixed regions in the section plane with respect to an area A of the reference electrode in the section plane is a mixed region ratio B/A, and a ratio of an area C of the void spaces in the section plane with respect to the area A of the reference electrode in the section plane is a void space ratio C/A, a parameter value as a product of the mixed region ratio B/A and the void space ratio C/A falls within a range of 0.001 to 0.01.

公开(公告)号：US20170343505A1

公开(公告)日：2017-11-30

申请号：US15528119

申请日：2015-11-02

Applicant: DENSO CORPORATION

Inventor： Makoto ITO ,  Takehiro WATARAI

IPC: G01N27/41 ,  G01N27/407 ,  G01N33/00 ,  G01N27/409 ,  G01N33/497 ,  G01N1/22

CPC classification number: G01N27/41 ,  G01N27/4072 ,  G01N27/4077 ,  G01N27/409 ,  G01N33/0047 ,  G01N2001/2244 ,  G01N2033/4975

Abstract: A gas sensor element includes a main body having a solid electrolyte body on which a measurement gas-side electrode and a reference gas-side electrode are provided, a trap layer covering an outer peripheral surface of the main body to trap poisoning substances contained in a measurement gas, and a waterproof protective layer covering an outer peripheral surface of the trap layer. In the protective layer, there is formed at least one measurement gas introduction port for introducing the measurement gas to the measurement gas-side electrode via the trap layer.

公开(公告)号：US20200064303A1

公开(公告)日：2020-02-27

申请号：US16547966

申请日：2019-08-22

Applicant: DENSO CORPORATION

Inventor： Masatoshi IKEDA ,  Shota HAGINO ,  Makoto ITO ,  Daisuke KAWAI

IPC: G01N27/407

Abstract: In a gas sensor element, an electrolyte layer has a solid electrolyte body having oxygen ionic conductivity. A first insulation body is stacked at a first surface side of the electrolyte layer. A second insulation body is stacked at a second surface side of the electrolyte layer. A measurement gas chamber is surrounded by the electrolyte layer and the first insulation body, into which a detection target gas is introduced. A reference gas chamber is surrounded by the electrolyte layer and the second insulation body, into which a reference gas is introduced. A heater is embedded in the first insulation body. The second insulation body has a low thermal conductivity part having a thermal conductivity which is lower than a thermal conductivity of a heater embedded part formed in the first insulation body in which the heater is embedded.

公开(公告)号：US20180328880A1

公开(公告)日：2018-11-15

申请号：US15977204

申请日：2018-05-11

Applicant: DENSO CORPORATION

Inventor： Junta ZUSHI ,  Makoto ITO

IPC: G01N27/407

CPC classification number: G01N27/4076 ,  G01N27/4071 ,  G01N27/4077

Abstract: A gas sensor S which detects a concentration of a specific gas contained in a gas to be measured is provided with a gas sensor element. The gas sensor element has an ion conductive solid electrolyte body, a measuring gas electrode which is mounted on a surface of the solid electrolyte body, a reference gas electrode mounted on a surface of the solid electrolyte body, and a catalyst layer mounted on an outer-side relative to the measuring gas electrode-side. The catalyst layer contains a metal catalyst loaded onto a carrier. The metal catalyst is a Pt single substance, and has a specific surface area defined by the equation below of equal to or more than 0.01 to equal to or less than 23. Specific surface are=total surface area of metal catalyst which exists on an electrode unit surface area/actual surface area of electrode per electrode unit surface area.  Equation 1:

公开(公告)号：US20170138896A1

公开(公告)日：2017-05-18

申请号：US15322916

申请日：2015-06-05

Applicant: DENSO CORPORATION

Inventor： Makoto ITO

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

CPC classification number: G01N27/4078 ,  G01N27/4067 ,  G01N27/4071 ,  G01N27/4076 ,  G01N27/4077 ,  G01N27/409

Abstract: A gas sensor is provided with: a sensor element having a solid electrolyte body, a measurement electrode and a reference electrode; a housing into which the sensor element is inserted; and an element cover arranged at the tip-end side of the housing. The element cover has an inner cover arranged so as to cover the tip-end portion of the sensor element from outside, and an outer cover arranged so as to cover the inner cover from outside. When L is defined as an axial distance from a base end of an internal space of the inner cover to the base end of the measurement electrode, an axial distance M from the base end of the internal space of the inner cover to the base end of an inner vent hole positioned in the most base-end side among the inner vent holes provided to the inner cover is 0.2 L to 0.65 L.