公开(公告)号：US20240151684A1

公开(公告)日：2024-05-09

申请号：US18500237

申请日：2023-11-02

申请人： NITERRA CO., LTD.

发明人： Hitoshi FURUTA ,  Kei YOSHIKAWA

IPC分类号： G01N27/407 ,  G01N27/41 ,  G01N33/00

CPC分类号： G01N27/4071 ,  G01N27/41 ,  G01N33/0027

摘要： A gas sensor element includes: a second ceramic layer including a pump cell in which a first electrode and a second electrode are provided on a surface of a first solid electrolyte body; a first ceramic layer including a measurement chamber which is faced by the first electrode and into which a gas to be measured flows; a porous body covering the second electrode; and a dense layer having a void and not allowing the gas to be measured to pass therethrough. The second electrode and the void are connected through the porous body. A reinforcing layer which is porous and contains, as a main component, a component having a lower firing start temperature than a main component of the porous body is interposed between the second electrode and the porous body at a position overlapping the void in a thickness direction of the porous body.

公开(公告)号：US11959877B2

公开(公告)日：2024-04-16

申请号：US17128361

申请日：2020-12-21

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Takayuki Sekiya

IPC分类号： G01N27/407 ,  G01N1/24 ,  G01N27/41 ,  G01N33/00 ,  G01R19/00

CPC分类号： G01N27/41 ,  G01N1/24 ,  G01N27/4071 ,  G01N33/0006 ,  G01R19/0092

摘要： In a gas sensor, oxygen pumping control is performed to pump oxygen from the surroundings of an outer side pump electrode into the surroundings of a reference electrode. In addition, during execution of the oxygen pumping control, a pump current Ip2 is measured when oxygen originating from NOx is pumped out from the surroundings of a measurement electrode so that a voltage V2 reaches a target voltage V2*. Then, the NOx concentration of a measurement-object gas is calculated based on Ip2. In the gas sensor, the NOx concentration is corrected based on DVref which is the difference between Vref1 and Vref2, wherein Vref1 is the voltage across the reference electrode and the outer side pump electrode when the oxygen pumping control is not performed, and Vref2 is the voltage across the reference electrode and the outer side pump electrode when the oxygen pumping control is performed.

公开(公告)号：US11879865B2

公开(公告)日：2024-01-23

申请号：US17207986

申请日：2021-03-22

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Mika Kai ,  Ryo Onishi ,  Saki Suzuki ,  Takashi Hino

IPC分类号： G01N27/407 ,  C04B38/00 ,  G01N27/41 ,  G01N27/419

CPC分类号： G01N27/4077 ,  C04B38/00 ,  G01N27/4071 ,  G01N27/4078 ,  G01N27/41 ,  G01N27/419

摘要： A sensor element includes: an inner protective layer having a porosity of 30% to 65% on two main surfaces; an intermediate protective layer, at least a part of which has contact with the inner layer, and having a porosity of 25% to 80%, which is equal to or smaller than the porosity of the inner layer; and an outer protective layer surrounding an element base on an outermost periphery on the one end portion of the sensor element, having contact with the intermediate and the inner layer, having contact with a leading end surface of the element base or the intermediate layer on the leading end surface, and having a porosity of 15% to 30%, which is smaller than the porosity of the intermediate layer, wherein a difference of porosity between the inner and the outer layer is 10% to 50%.

公开(公告)号：US20230324329A1

公开(公告)日：2023-10-12

申请号：US18185487

申请日：2023-03-17

申请人： NGK INSULATORS, LTD.

发明人： Yusuke WATANABE ,  Taku OKAMOTO

IPC分类号： G01N27/407 ,  G01N27/41 ,  G01N33/00

CPC分类号： G01N27/4078 ,  G01N27/41 ,  G01N33/0037

摘要： A casing of a gas sensor having a reference gas space therein includes: an outer tube into which an end portion of a sensor element protrudes; and a seal member fit into an end portion of the outer tube to seal the reference gas space, the sensor element includes: a first electrode lead portion including a first electrode lead to electrically connect an outside and at least one inner electrode and a first lead insulating layer covering the first electrode lead; and a second electrode lead portion including a second electrode lead that can electrically connect the outside and a measurement electrode and a second lead insulating layer covering the second electrode lead, and A/B

公开(公告)号：US20230324327A1

公开(公告)日：2023-10-12

申请号：US18159830

申请日：2023-01-26

申请人： NGK INSULATORS, LTD.

发明人： Yusuke WATANABE ,  Taku OKAMOTO

IPC分类号： G01N33/00 ,  G01N27/407 ,  G01N27/406 ,  G01N27/41

CPC分类号： G01N27/4065 ,  G01N27/4078 ,  G01N27/41 ,  G01N33/0037

摘要： A controller of a gas sensor includes: a concentration identification part identifying a concentration of a predetermined gas component based on a measurement pump current flowing between a measurement electrode and an out-of-space pump electrode in accordance with the concentration of the predetermined gas component due to application of a predetermined pump voltage; and a correction processing part correcting the concentration of the predetermined gas component identified by the concentration identification part, the correction processing part corrects the concentration of the predetermined gas component based on a correlation identified in advance between an offset current value as a magnitude of the measurement pump current when a measurement gas not containing the predetermined gas component flows or a normalized value of the offset current value and output fluctuations of the measurement pump current at startup of the gas sensor.

公开(公告)号：US11782017B2

公开(公告)日：2023-10-10

申请号：US15742148

申请日：2016-07-04

申请人： DENSO CORPORATION

发明人： Mitsunobu Nakatou ,  Keigo Mizutani ,  Takashi Araki ,  Tadashi Nakamura

IPC分类号： G01N27/41 ,  G01N27/407 ,  G01N27/409 ,  G01N27/419

CPC分类号： G01N27/41 ,  G01N27/409 ,  G01N27/4074 ,  G01N27/4075 ,  G01N27/419

摘要： On a cross sectional surface X1 of a pump electrode 3 in a gas sensor element forming a gas sensor, a noble metal area 31 having Pt—Au aggregations, a solid electrolyte area 32 having solid electrolyte aggregations, a mixture area in which Pt—Au alloy and solid electrolyte are distributed, and pores 34. The mixture area 33 is formed within a range of 30 to 90% in an overall area of the cross sectional surface X1, excepting the pores 34. The pores are formed adjacent to the mixture area 33.

公开(公告)号：US20230304963A1

公开(公告)日：2023-09-28

申请号：US18138170

申请日：2023-04-24

申请人： NGK INSULATORS, LTD.

发明人： Yusuke WATANABE ,  Shotaro NIIZUMA ,  Toshihiro HIRAKAWA ,  Hayami AOTA

IPC分类号： G01N27/407 ,  G01N27/409 ,  G01N27/41

CPC分类号： G01N27/4073 ,  G01N27/4071 ,  G01N27/409 ,  G01N27/41 ,  G01N33/0037

摘要： A gas sensor includes: a laminate formed of a plurality of layers including at least one layer of a solid electrolyte; a reference gas chamber formed in the laminate and containing a reference gas; and a reference electrode partially exposed in the reference gas chamber. A portion which is not exposed in the reference gas chamber, of the reference electrode is sandwiched between, among the layers, a first layer and a second layer adjacent to the first layer. When an area of the portion sandwiched between the first layer and the second layer, of the reference electrode is defined as a first area, and an area of a portion exposed in the reference gas chamber, of the reference electrode is defined as a second area, a ratio of the first area to the second area is 0.3 or more.

公开(公告)号：US20230228702A1

公开(公告)日：2023-07-20

申请号：US18154357

申请日：2023-01-13

申请人： NGK Insulators, Ltd.

发明人： Yusuke WATANABE ,  Yasumasa FUJIOKA ,  Yohei GORO ,  Akihiro NAKAJIMA ,  Shotaro NIIZUMA

IPC分类号： G01N27/409 ,  G01N27/41 ,  G01N33/00 ,  G01N27/406

CPC分类号： G01N27/409 ,  G01N27/41 ,  G01N33/0037 ,  G01N27/4067

摘要： Provided is a gas sensor element capable of realizing highly accurate concentration measurement in both environments where the concentration of a specific gas in a measurement target gas is high and where the concentration is low. A gas sensor according to one aspect of the present invention determines whether the concentration of a predetermined gas component in a measurement target gas is higher or lower than a predetermined concentration. If it is determined that the concentration is lower, a specific temperature that a sensor element is to reach as a result of being heated by a heater unit is set to be lower than the specific temperature set if it is determined that the concentration is higher.

公开(公告)号：US11680926B2

公开(公告)日：2023-06-20

申请号：US17170940

申请日：2021-02-09

申请人： NGK INSULATORS, LTD.

发明人： Taku Okamoto ,  Yuichiro Kondo ,  Osamu Nakasone

IPC分类号： G01N27/41 ,  G01N27/406

CPC分类号： G01N27/41 ,  G01N27/4062 ,  G01N27/4065 ,  G01N27/4067

摘要： A gas sensor includes a sensor element including an element body, a first electrode, a second electrode, and a heater; a voltage acquisition section that acquires a voltage between the first electrode and the second electrode; a heater power supply; an external common lead that serves as both at least part of an electric circuit used to acquire the voltage by providing electrical continuity between the first electrode and the voltage acquisition section and at least part of an electric circuit used to supply an electric power from the heater power supply to the heater and that is disposed outside the sensor element; and a correction section that derives a value of a voltage drop in the external common lead in accordance with a heater current and that corrects the voltage acquired by the voltage acquisition section in accordance with the derived value of the voltage drop.

公开(公告)号：US20230168222A1

公开(公告)日：2023-06-01

申请号：US18153009

申请日：2023-01-11

申请人： NGK INSULATORS, LTD.

发明人： Daichi ICHIKAWA

IPC分类号： G01N27/41 ,  G01N27/407

CPC分类号： G01N27/41 ,  G01N27/4076

摘要： A sensor element according to the present invention includes an element body having a measurement-object gas flow section into which an exhaust gas is introduced, an adjustment pump cell including a measurement-object-gas-side electrode disposed in a portion exposed to the exhaust gas on an outer side of the element body, the adjustment pump cell being configured to adjust an oxygen concentration in an oxygen concentration adjustment chamber included in the measurement-object gas flow section, a measurement electrode disposed in a measurement chamber located downstream of the oxygen concentration adjustment chamber, and a reference electrode into which a reference gas is introduced. The measurement-object-gas-side electrode has an Au/(Pt+Au) ratio (=an area of a portion where Au is exposed/an area of a portion where Au and Pt are exposed) 0.2-0.7, the Au/(Pt+Au) ratio being measured by using XPS.