公开(公告)号：US20140332378A1

公开(公告)日：2014-11-13

申请号：US14274994

申请日：2014-05-12

Applicant: NGK Insulators, Ltd.

Inventor： Osamu NAKASONE ,  Satoshi NISHIKAWA ,  Shotarou NIIZUMA ,  Noriko HIRATA ,  Yuki NAKAYAMA

IPC: G01N27/41

CPC classification number: G01N27/41 ,  G01N27/4074 ,  G01N27/419 ,  G01N33/0047

Abstract: Provided is a gas sensor capable of accurately obtaining a hydrocarbon gas concentration even if a measurement gas contains water vapor. A main pumping cell adjusts an oxygen partial pressure of a first internal space such that a hydrocarbon gas in a measurement gas is not substantially burned in the first internal space. An auxiliary pumping cell adjusts an oxygen partial pressure of a second internal space such that inflammable gas components except for hydrocarbon are selectively burned. Then, a measuring pumping cell supplies oxygen to a surface of a measuring electrode. As a result, hydrocarbon existing in the measurement gas being in contact with the measuring electrode is all burned on the surface of the measuring electrode and, based on the magnitude of a current flowing between the measuring electrode and a main pumping electrode at that time, identifies a concentration of a hydrocarbon gas component existing in the measurement gas.

Abstract translation: 提供了即使测量气体含有水蒸气也能够精确地获得烃气体浓度的气体传感器。 主泵送单元调节第一内部空间的氧分压，使得测量气体中的烃气体在第一内部空间中基本上不被燃烧。 辅助泵送单元调节第二内部空间的氧分压，使得除了烃之外的可燃气体成分被选择性地燃烧。 然后，测量泵送单元向测量电极的表面供氧。 结果，与测量电极接触的测量气体中存在的烃全部在测量电极的表面上燃烧，并且基于此时在测量电极和主泵送电极之间流动的电流的大小， 识别存在于测量气体中的烃气体组分的浓度。

公开(公告)号：US20220113280A1

公开(公告)日：2022-04-14

申请号：US17558775

申请日：2021-12-22

Applicant: NGK INSULATORS, LTD.

Inventor： Kunihiko NAKAGAKI ,  Taku OKAMOTO ,  Osamu NAKASONE ,  Nobukazu IKOMA

IPC: G01N27/41 ,  G01N27/407 ,  F01N11/00 ,  G01M15/10

Abstract: A gas sensor includes an element body, an adjustment pump cell, a preliminary pump cell, a measurement electrode, a reference electrode, a specific gas concentration detection device. The element body provides a measurement-object gas flow section to allow a measurement-object gas to be introduced into and flow through the measurement-object gas flow section. The adjustment pump cell adjusts an oxygen concentration of an oxygen concentration adjustment chamber in the measurement-object gas flow section. The preliminary pump cell pumps oxygen into a preliminary chamber to prevent the measurement-object gas in a low-oxygen atmosphere from reaching the oxygen concentration adjustment chamber, the preliminary chamber being provided upstream of the oxygen concentration adjustment chamber in the measurement-object gas flow section. The measurement electrode is disposed on an inner peripheral surface of a measurement chamber provided downstream of the oxygen concentration adjustment chamber in the measurement-object gas flow section.

公开(公告)号：US20200088666A1

公开(公告)日：2020-03-19

申请号：US16688101

申请日：2019-11-19

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Yuki NAKAYAMA ,  Kosuke MONNA ,  Osamu NAKASONE

IPC: G01N27/02 ,  G01N27/407 ,  G01N27/417

Abstract: Provided is a method of suitably judging necessity of a recovering process carried out on a mixed-potential gas sensor based on an extent of reversible deterioration occurring in a sensing electrode. The method includes the steps of: (a) performing impedance measurement between a sensing electrode exposed to a measurement gas and a reference electrode exposed to a reference atmosphere, which are provided in the gas sensor; and (b) judging necessity of a recovering process based on electrode reaction resistance or a diagnosis parameter correlating with the electrode reaction resistance wherein the electrode reaction resistance and the diagnosis parameter are obtained based on a result of the impedance measurement. The two steps are intermittently or periodically repeated during use of the gas sensor, and it is judged that a recovering process is necessary when the judge parameter satisfies a predetermined threshold condition in the step (b).

公开(公告)号：US20200080459A1

公开(公告)日：2020-03-12

申请号：US16555005

申请日：2019-08-29

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Osamu NAKASONE

IPC: F01N11/00 ,  B01D53/94 ,  G01M15/10 ,  F02D41/14 ,  F01N3/10

Abstract: A catalyst deterioration diagnosis method is a method for a system. The system includes a stepped transmission or a continuously variable transmission connected to an internal combustion engine, a catalyst into which an exhaust gas from the internal combustion engine is introduced, and a gas sensor having sensitivity to ammonia that outputs a detection value corresponding to a component of an exhaust gas that has passed through the catalyst. The catalyst deterioration diagnosis method includes the following steps. Monitoring of temporary increase of a detection value of the gas sensor is started, and thereby a temporarily increased amount of the detection value of the gas sensor is acquired. The monitoring is started when upshifting of the stepped transmission or pseudo-upshifting of the continuously variable transmission is performed. Whether or not the temporarily increased amount is larger than a threshold amount is determined.

公开(公告)号：US20200003724A1

公开(公告)日：2020-01-02

申请号：US16452714

申请日：2019-06-26

Applicant: NGK INSULATORS, LTD.

Inventor： Osamu NAKASONE ,  Taku OKAMOTO ,  Nobukazu IKOMA

IPC: G01N27/407 ,  G01N27/41

Abstract: A gas sensor detects the concentration of a specific gas on the basis of a pump current that flows when oxygen is pumped out from a measurement chamber, so that an oxygen concentration in the measurement chamber becomes a predetermined low concentration, the oxygen that is pumped out being oxygen that is generated when the specific gas is reduced in measurement chamber in a case where the specific gas is an oxide or being oxygen that is generated when a gas obtained as a result of conversion of the specific gas to an oxide is reduced in the measurement chamber in a case where the specific gas is a non-oxide. Further, the gas sensor corrects the pump current or the concentration of the specific gas on the basis of the oxygen concentration of the measurement-object gas when the measurement-object gas is in a rich atmosphere.

公开(公告)号：US20160223487A1

公开(公告)日：2016-08-04

申请号：US14995510

申请日：2016-01-14

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Osamu NAKASONE ,  Yuki NAKAYAMA

IPC: G01N27/407

Abstract: Provided is a gas sensor capable of accurately obtaining the concentrations of water vapor and carbon dioxide in up to a high concentration range. The diffusion resistance from a gas inlet to a first internal space is 370/cm to 100/cm. The oxygen partial pressure of the first internal space is adjusted to 10−12 atm to 10−30 atm. A first measuring pumping cell adjusts the oxygen partial pressure of a second internal space such that hydrogen generated by the decomposition of water vapor selectively burns. A second measuring pumping cell adjusts the oxygen partial pressure on the surface of a second measuring internal electrode such that all of the carbon monoxide generated by the decomposition of carbon dioxide burns on the surface. The concentrations of water vapor and carbon dioxide are based on the magnitude of a current flowing between the first or second measuring internal electrode and the external electrode.

Abstract translation: 提供能够精确地获得高浓度范围内的水蒸汽和二氧化碳浓度的气体传感器。 从气体入口到第一内部空间的扩散阻力为370 / cm〜100 / cm。 将第一内部空间的氧分压调节至10-12atm至10-30atm。 第一测量泵浦单元调节第二内部空间的氧分压，使得由水蒸气分解产生的氢气选择性地燃烧。 第二测量泵浦单元调节第二测量内部电极的表面上的氧分压，使得由二氧化碳分解产生的所有一氧化碳在表面上燃烧。 水蒸气和二氧化碳的浓度基于在第一或第二测量内部电极和外部电极之间流动的电流的大小。

公开(公告)号：US20160216229A1

公开(公告)日：2016-07-28

申请号：US14995362

申请日：2016-01-14

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Osamu NAKASONE ,  Yuki NAKAYAMA

IPC: G01N27/419 ,  G01N27/41

Abstract: Provided is a gas sensor capable of accurately obtaining the concentration of water vapor of a measurement gas. A main pumping cell adjusts an oxygen partial pressure of a first internal space such that all of the water vapor of a measurement gas is decomposed in the first internal space. A measuring pumping cell adjusts an oxygen partial pressure of a second internal space such that hydrogen generated by the decomposition of water vapor selectively burns. A metal component of a measuring internal electrode contains an alloy of gold and a noble metal other than gold. A gold abundance ratio of the metal component on the surface of the measuring internal electrode is 25 at % or higher. The concentration of water vapor is identified based on the magnitude of a current flowing between the measuring internal electrode and an external electrode.

Abstract translation: 提供能够精确地获得测定气体的水蒸气浓度的气体传感器。 主泵送单元调节第一内部空间的氧分压，使得测量气体的所有水蒸气在第一内部空间中分解。 测量泵送单元调节第二内部空间的氧分压，使得由水蒸汽分解产生的氢气选择性地燃烧。 测量内部电极的金属成分含有金和金以外的贵金属的合金。 测量内部电极的表面上的金属成分的金丰度比为25at％以上。 基于在测量内部电极和外部电极之间流动的电流的大小来识别水蒸汽的浓度。

公开(公告)号：US20160061768A1

公开(公告)日：2016-03-03

申请号：US14823217

申请日：2015-08-11

Applicant: NGK INSULATORS, LTD.

Inventor： Osamu NAKASONE ,  Takayuki SAKURAI ,  Satoshi NISHIKAWA ,  Noriko HIRATA ,  Yuki NAKAYAMA

IPC: G01N27/407 ,  G01N27/41 ,  G01N27/30

CPC classification number: G01N27/4074 ,  G01N27/301 ,  G01N27/4072 ,  G01N27/41 ,  G01N27/419

Abstract: Provided is a gas sensor having excellent detection sensitivity and responsiveness. In a sensor element, 3.5≦D2/D1≦6 is satisfied, where D1 is a value of a diffusion resistance of a measurement gas via a main gas distribution part extending from an outside edge position of a first gas inlet to the second internal space, and D2 is a value of a diffusion resistance of a measurement gas flowing via a second gas inlet that causes the outside and the second internal space to communicate with each other. The concentration of a predetermined gas component contained in the measurement gas through the second gas inlet is determined on the basis of a potential difference between the sensing electrode and a reference electrode, while pumping oxygen in or out for the measurement gas via the main gas distribution part such that the oxygen concentration of the second internal space is maintained at 1 vol % or more.

Abstract translation: 提供了具有优异的检测灵敏度和响应性的气体传感器。 在传感器元件中，满足3.5＆nlE; D2 / D1＆nlE; 6，其中D1是经由主气体分配部分从第一气体入口的外边缘位置延伸到第二内部的测量气体的扩散电阻的值 空间和D2是通过使第二内部空间彼此连通的第二气体入口流动的测量气体的扩散阻力的值。 基于感测电极和参考电极之间的电位差来确定测量气体中包含的通过第二气体入口的预定气体组分的浓度，同时通过主气体分布泵送测量气体中的氧气 使得第二内部空间的氧浓度保持在1体积％以上。

公开(公告)号：US20150034484A1

公开(公告)日：2015-02-05

申请号：US14338698

申请日：2014-07-23

Applicant: NGK Insulators, Ltd.

Inventor： Osamu NAKASONE ,  Noriko HIRATA

IPC: G01N27/416 ,  G01N27/417

CPC classification number: G01N27/4162 ,  G01N27/417 ,  G01N27/419

Abstract: Provided is a gas sensor capable of accurately obtaining the concentrations of water vapor and carbon dioxide in a measurement gas. A main pumping cell adjusts an oxygen partial pressure of a first internal space such that water vapor and carbon dioxide in the measurement gas are all decomposed in the first internal space. A first measuring pumping cell adjusts an oxygen partial pressure of a second internal space such that hydrogen generated through the decomposition of water vapor is selectively burned. A second measuring pumping cell adjusts an oxygen partial pressure on the surface of a second measuring internal electrode such that carbon monoxide generated through the decomposition of carbon dioxide is all burned on the surface of the second measuring internal electrode. The concentration of water vapor is identified based on the magnitude of a current flowing between a first measuring internal electrode and an external electrode, and the concentration of carbon dioxide is identified based on the magnitude of a current flowing between the second measuring internal electrode and the external electrode.

Abstract translation: 提供能够准确地获得测定气体中的水蒸气和二氧化碳浓度的气体传感器。 主泵送单元调节第一内部空间的氧分压，使得测量气体中的水蒸汽和二氧化碳都在第一内部空间中分解。 第一测量泵浦单元调节第二内部空间的氧分压，使得通过水蒸气分解产生的氢气被选择性地燃烧。 第二测量泵浦单元调节第二测量内部电极的表面上的氧分压，使得通过二氧化碳分解产生的一氧化碳全部在第二测量内部电极的表面上燃烧。 基于在第一测量内部电极和外部电极之间流动的电流的大小来识别水蒸气的浓度，并且基于在第二测量内部电极和外部电极之间流动的电流的大小来识别二氧化碳的浓度 外部电极。

公开(公告)号：US20210270768A1

公开(公告)日：2021-09-02

申请号：US17170940

申请日：2021-02-09

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Yuichiro KONDO ,  Osamu NAKASONE

IPC: G01N27/41 ,  G01N27/406

Abstract: 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.