公开(公告)号：US11899002B2

公开(公告)日：2024-02-13

申请号：US17208060

申请日：2021-03-22

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Takayuki Sekiya

IPC分类号： G01N33/00 ,  G01N27/419 ,  G01N27/41 ,  G01N27/407 ,  G01N27/409

CPC分类号： G01N33/0037 ,  G01N27/409 ,  G01N27/4073 ,  G01N27/41 ,  G01N27/419

摘要： A limiting-current type gas sensor including a sensor element including a base part made of an oxygen-ion conductive solid electrolyte and measuring concentration of NOx in a measurement gas includes: a pump cell including a first electrode disposed to be capable of being in contact with a gas introduced into the element and a second electrode disposed so that a part made of the solid electrolyte is located between the first electrode and the second electrode; and a pumping diagnostic part to determine whether an inter-electrode electric field produced in the part made of the solid electrolyte through application of a predetermined pump voltage between the electrodes exceeds a first threshold, and, when the inter-electrode electric field exceeds the first threshold, the predetermined pump voltage is reduced so that the inter-electrode electric field falls below the first threshold.

公开(公告)号：US11852607B2

公开(公告)日：2023-12-26

申请号：US17205633

申请日：2021-03-18

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Shotaro Niizuma

IPC分类号： G01N27/04 ,  G01N27/406 ,  G01N27/41 ,  G01N33/00

CPC分类号： G01N27/41 ,  G01N27/4062 ,  G01N33/0037

摘要： A sensor element includes a first pump cell including a first pump electrode and a first reference electrode, a first pump circuit including the first pump cell and a first reference electrode lead, a second pump cell including a second pump electrode and a second reference electrode and a second pump circuit including the second pump cell and a second pump electrode. A resistance value R2 of the second pump circuit is higher than a resistance value R1 of the first pump circuit, and a porosity P2 of the second reference electrode lead is higher than a porosity P1 of the first reference electrode lead.

公开(公告)号：US11768169B2

公开(公告)日：2023-09-26

申请号：US16686812

申请日：2019-11-18

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Takao Murase ,  Masashi Yasui

IPC分类号： H05B3/02 ,  G01N27/406 ,  G01N27/409 ,  G01N27/416 ,  H05B3/14 ,  H05B1/02 ,  H05B3/00 ,  H05B3/26

CPC分类号： G01N27/4067 ,  H05B1/0247 ,  H05B3/0014 ,  H05B3/265

摘要： A heater section includes a plate-like ceramic body (a first substrate layer 1, a second substrate layer 2, and a third substrate layer 3) having a longitudinal direction (front-rear direction) and a short-length direction (left-right direction), and a heater 72 disposed within the plate-like ceramic body and including a lead section 79 and a heating section 76 connected to the lead section 79. The heating section 76 includes a straight portion 78 extending along the longitudinal direction, and a lead side curved portion 77b connected to one of the ends of the straight portion 78 closer to the lead section 79. The lead side curved portion 77b has a lower resistance per unit length than the straight portion 78 at one or more temperatures in the range of 700° C. to 900° C.

公开(公告)号：US11585781B2

公开(公告)日：2023-02-21

申请号：US17002942

申请日：2020-08-26

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Shotaro Niizuma ,  Hayami Aota ,  Toshihiro Hirakawa

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

摘要： A gas sensor includes: a sensor element; a ceramic housing holding a rear end portion of the sensor element and provided with metal terminals electrically connected to the sensor element; and an elastic insulating member that is fixed in the rear of the sensor element and into which a plurality of lead wires electrically connected to the metal terminals are inserted. The elastic insulating member has one or more common spaces formed in a surface of the elastic insulating member that faces the ceramic housing. Two or more of the lead wires are arranged in each common space.

公开(公告)号：US11531014B2

公开(公告)日：2022-12-20

申请号：US16998003

申请日：2020-08-20

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Takayuki Sekiya ,  Daichi Ichikawa

IPC分类号： G01N27/419 ,  G01N33/00 ,  G01N27/407

摘要： A controller of the gas sensor can perform diagnostic processing of diagnosing a situation of control to the gas sensor in a case that the gas sensor in an operation state is determined to satisfy a predetermined diagnostic condition and adjustment processing of adjusting a condition for controlling the gas sensor in accordance with a result of diagnosis. In the diagnostic processing, a main pump voltage and a diagnostic threshold as a value of a voltage not causing decomposition of NOx in the main pump cell are compared. In the adjustment processing, temperature adjustment processing to cause, in a case that the main pump voltage is diagnosed to be equal to the threshold or more, the main pump voltage to be less than the threshold, at least in a way that the heater part increases the element driving temperature in the operation state by a predetermined increase amount is performed.

公开(公告)号：US11249044B2

公开(公告)日：2022-02-15

申请号：US16522715

申请日：2019-07-26

申请人： NGK INSULATORS, LTD.

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

IPC分类号： G01N27/407 ,  G01N27/409 ,  G01N27/406 ,  G01N27/41 ,  G01N27/416

摘要： A first leading-end protective layer surrounding a first range at least including a leading end surface of an element base is included on a side of one end portion. A single heat insulating space is interposed between the first layer and the element base in the first range. The element base further includes a second leading-end protective layer having a larger porosity than the first layer, and located on a whole side surface at least in the first range. An end portion of the first layer opposite the one end portion is a fixed portion to the second layer. A portion where the fixed portion is in contact with the second layer is 10% to 50%, in area, of the first range. The fixed portion and the second layer make an end portion angle of 5° to 15° in an end portion of the heat insulating space.

公开(公告)号：US11067531B2

公开(公告)日：2021-07-20

申请号：US16734616

申请日：2020-01-06

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Takayuki Sekiya

IPC分类号： G01N27/41 ,  G01N27/419 ,  G01N27/30 ,  G01N27/407 ,  G01N27/406

摘要： A method of operation of a gas sensor includes applying a control voltage that is repetitively set to on state and off state between the reference electrode and the measurement-object gas side electrode to pump in oxygen to the periphery of the reference electrode; and detecting the specific gas concentration in the measurement-object gas on the basis of a voltage between the reference electrode and the measurement electrode during a second period, from among a first period that is started upon setting of the control voltage to on state, during which a potential difference between the reference electrode and the measurement-object gas side electrode is large, and the second period that is started upon setting of the control voltage to off state after the potential difference falls from the first period.

公开(公告)号：US10908118B2

公开(公告)日：2021-02-02

申请号：US16351741

申请日：2019-03-13

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Takayuki Sekiya

IPC分类号： G01N27/407 ,  G01N27/41 ,  G01N27/30 ,  G01N27/409 ,  G01N33/00

摘要： A sensor element includes: a main pump cell constituted by an inner pump electrode facing a first inner space into which a measurement gas is introduced, an external pump electrode provided on an element surface, and a solid electrolyte located therebetween; and a measurement pump cell constituted by the measurement electrode facing a second inner space which is communicated with the first inner space and functioning as a reduction catalyst for NOx, and a solid electrolyte located therebetween. The inner pump electrode has a planar shape in which two parts of a front end part relatively having a large area and a rear end part relatively having a small area are sequentially connected in this order from an upstream side in a longitudinal direction of the sensor element while satisfying requirements of a predetermined size and area.

公开(公告)号：US10712307B2

公开(公告)日：2020-07-14

申请号：US15238817

申请日：2016-08-17

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Takao Murase ,  Masashi Yasui ,  Rui Sakaguchi

IPC分类号： G01N27/406 ,  H05B1/02 ,  H05B3/26

摘要： A heater 72 of a heater portion includes linear portions 78 and bend portions 77. A resistance value per unit length of the bend portions 77 at least at a temperature within a temperature range of no less than 700° C. and no more than 900° C. is lower than a resistance value per unit length of the linear portions 78.

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.