公开(公告)号：US10830730B2

公开(公告)日：2020-11-10

申请号：US16006222

申请日：2018-06-12

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Ai Igarashi ,  Kouji Toida ,  Shun Sakuma

IPC: G01N27/407

Abstract: A plate-shaped sensor element (10) including at least a first layer (150), a second layer (130), and a third layer (140) being stacked in a stacking direction. The first layer and the third layer are mainly formed of ceramic. The second layer is disposed between the first layer and the third layer in the stacking direction. The second layer has an air introduction hole (131) opened at an end surface. In a cross-section perpendicular to a direction of an axis O, a length L1 of a shortest line segment P1 connecting an upper end surface (10a, 10b) of the sensor element and the centroid G1 of the sensor element and a length L2 of a shortest line segment P2 connecting the upper end surface of the sensor element and the centroid G2 of the air introduction hole, satisfy a relationship of |L2−L1|/L1≤0.05.

公开(公告)号：US09976979B2

公开(公告)日：2018-05-22

申请号：US14862209

申请日：2015-09-23

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Satoshi Okazaki ,  Akinori Kojima ,  Masaki Mizutani ,  Nobuo Furuta ,  Ai Igarashi

IPC: G01N27/407 ,  B05D3/06 ,  B05D3/00 ,  B05D3/02

CPC classification number: G01N27/4073

Abstract: A gas sensor element (10) includes a first composite ceramic layer (111) having a plate-shaped first surrounding portion (112) formed of an insulating ceramic and including a through hole inner-perimetric-surface (115) which defines a through hole (112h), and a plate-shaped first electrolyte portion (121) formed of a solid electrolyte ceramic, disposed in the through hole (112h), and including an electrolyte outer-perimetric-surface (125) in contact with the through hole inner-perimetric-surface (115). The electrolyte outer-perimetric-surface (125) of the first electrolyte portion (121) is sloped toward an exterior of the first electrolyte portion (121) as it approaches one side DT1. The through hole inner-perimetric-surface (115) and the electrolyte outer-perimetric-surface 125 are in close contact with each other along their entire perimeters.

公开(公告)号：US11535569B2

公开(公告)日：2022-12-27

申请号：US16807289

申请日：2020-03-03

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Satoshi Okazaki ,  Masaki Mizutani ,  Ai Igarashi

IPC: C04B35/64 ,  G01N27/407 ,  G01N27/409 ,  C04B37/00

Abstract: A method for manufacturing a sensor element that includes: a pair of electrodes; a ceramic layer having a hollow space that is to be an air introduction hole; and a first layer and a second layer stacked at both surfaces of the ceramic layer, One of the electrodes is in communication with the hollow space, The method includes: preparing an unsintered ceramic sheet, and a burn-out material sheet having a thickness different from that of the unsintered ceramic sheet, the burn-out material sheet having, in a plane orthogonal to the direction of an axial line O, a cross-sectional area substantially identical to a cross-sectional area of the pre-sintering hollow space; placing the burn-out material sheet in the pre-sintering hollow space; pressing the sheets so as to have an identical thickness; and burning out the burn-out material sheet.

公开(公告)号：US10481122B2

公开(公告)日：2019-11-19

申请号：US15498074

申请日：2017-04-26

Applicant: NGK Spark Plug Co., LTD.

Inventor： Ai Igarashi ,  Kouji Toida ,  Shun Sakuma

IPC: G01N27/407 ,  G01N27/406

Abstract: A gas sensor element comprises a solid electrolyte layer; a detection electrode provided on one surface of the solid electrolyte layer; a reference electrode provided on another surface of the solid electrolyte layer; a first layer provided on a side where the other surface of the solid electrolyte layer is present, and having a reference gas flow path; and a heater layer provided on a side opposite to a side where the solid electrolyte layer is provided. In the gas sensor element, an introduction flow path is formed as a flow path for guiding the reference gas from outer surfaces of the gas sensor element to the reference gas flow path. The introduction flow path has an opening provided at an outer surface that is perpendicular to a stacking direction of the gas sensor element and is provided on a side opposite to the heater layer.

公开(公告)号：US10330636B2

公开(公告)日：2019-06-25

申请号：US15139899

申请日：2016-04-27

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Ai Igarashi

IPC: G01N27/407 ,  G01N27/409

Abstract: A gas sensor element including a composite ceramic layer including a plate-shaped insulating portion containing an insulating ceramic and having a through hole formed therein and a plate-shaped electrolyte portion containing a solid electrolyte ceramic and disposed in the through hole; and a first conductor layer extending continuously from a first insulating surface on one side of the insulating portion to a first electrolyte surface of the electrolyte portion facing the same direction as the one side of the insulating portion. The first insulating surface is flush with the first electrolyte surface. The electrolyte portion has, on its first electrolyte surface side, an extension portion extending outward from the through hole so as to overlap the first insulating surface. Further, the thickness of the extension portion decreases toward the outer circumference of the extension portion. Also disclosed is a method of manufacturing the gas sensor element.

公开(公告)号：US10883959B2

公开(公告)日：2021-01-05

申请号：US16006222

申请日：2018-06-12

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Ai Igarashi ,  Kouji Toida ,  Shun Sakuma

IPC: G01N27/407

Abstract: A plate-shaped sensor element (10) including at least a first layer (150), a second layer (130), and a third layer (140) being stacked in a stacking direction. The first layer and the third layer are mainly formed of ceramic. The second layer is disposed between the first layer and the third layer in the stacking direction. The second layer has an air introduction hole (131) opened at an end surface. In a cross-section perpendicular to a direction of an axis O, a length L1 of a shortest line segment P1 connecting an upper end surface (10a, 10b) of the sensor element and the centroid G1 of the sensor element and a length L2 of a shortest line segment P2 connecting the upper end surface of the sensor element and the centroid G2 of the air introduction hole, satisfy a relationship of |L2−L1|/L1≤0.05.

公开(公告)号：US10247698B2

公开(公告)日：2019-04-02

申请号：US14992577

申请日：2016-01-11

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Ai Igarashi ,  Satoshi Okazaki

IPC: G01N27/407 ,  G01N27/417 ,  B28B17/00 ,  B28B19/00

Abstract: A gas sensor element that includes a composite ceramic layer including a plate-shaped insulating portion which contains an insulating ceramic and has a through-hole, and an electrolyte portion which contains a solid electrolyte ceramic, and a portion disposed in the through-hole where the electrolyte portion is thicker than the insulating portion. A first conductor layer is formed over a first insulating surface of the insulating portion and a first electrolyte surface of the electrolyte portion. The electrolyte portion has an extending portion which is overlaid on the first insulating surface and extends toward the outside of the through-hole. The thickness of the extending portion is decreased toward an outer periphery of the extending portion, and the outer periphery of the extending portion is continuously connected to the first insulating surface. A first extending surface of the extending portion continuously connects the first insulating surface and the first electrolyte surface.

公开(公告)号：US09386633B2

公开(公告)日：2016-07-05

申请号：US14189540

申请日：2014-02-25

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Ai Igarashi ,  Hiroyuki Hayashi ,  Tomohisa Terui ,  Kaoru Hisada

IPC: H05B1/02

CPC classification number: H05B1/0247 ,  H05B1/023

Abstract: A heater control method and apparatus for a gas sensor which can quickly activate a detection element while reducing load due to heating even when a higher power supply voltage is applied. A heater element is connected to a power supply whose voltage is higher than 16 V, and power is supplied under PWM control such that a temperature rise of the heater element follows a temperature rise curve obtained when a voltage of 12 V is applied to the heater element. Even though a higher voltage is applied, the temperature rise per unit time during the ON time of the PWM control is decreased. This is because the ON time per cycle is shortened by increasing the PWM frequency to 30 Hz or higher. Thus, the temperature rise per cycle is kept low, whereby the temperature rise per 0.1 second is rendered less than 25° C.

Abstract translation: 一种用于气体传感器的加热器控制方法和装置，其可以在即使施加更高的电源电压的同时减少由于加热引起的负载而能够快速地启动检测元件。 加热器元件连接到电压高于16V的电源，并且在PWM控制下供电，使得加热器元件的温度升高遵循当对电加热器施加12V的电压时获得的升温曲线 元件。 即使施加较高的电压，在PWM控制的导通时间期间，每单位时间的温度上升降低。 这是因为通过将PWM频率提高到30Hz以上来缩短每个周期的导通时间。 因此，每个循环的温度升高保持低，从而每0.1秒的温度升高小于25℃。