公开(公告)号：US20200309727A1

公开(公告)日：2020-10-01

申请号：US16819813

申请日：2020-03-16

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Osamu NAKASONE ,  Nobukazu IKOMA ,  Noriko HIRATA

IPC: G01N27/409 ,  G01N27/407 ,  G01N27/41 ,  G01N33/00

Abstract: A gas sensor includes an element body including oxygen-ion-conductive solid electrolyte layers and having a measurement-object gas flow section inside the element body; a main pump cell configured to adjust the oxygen concentration in a first internal cavity; an auxiliary pump cell configured to adjust the oxygen concentration in a second internal cavity; a measurement electrode disposed on an inner peripheral surface of a third internal cavity; and a reference electrode. An inner pump electrode of the main pump cell does not contain a noble metal having a catalytic activity inhibition ability. An auxiliary pump electrode of the auxiliary pump cell contains the noble metal having the catalytic activity inhibition ability.

公开(公告)号：US20200080460A1

公开(公告)日：2020-03-12

申请号：US16555003

申请日：2019-08-29

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Osamu NAKASONE ,  Kosuke MONNA

IPC: F01N11/00 ,  F02D41/14

Abstract: A catalyst deterioration diagnosis method is a method for a system. The system includes a gas sensor having ammonia interference property that measures an air-fuel ratio and nitrogen oxide concentration of an exhaust gas that has passed through a catalyst. Monitoring of temporary increase of nitrogen oxide concentration to be detected by the gas sensor is started, and thereby a temporarily increased amount of the nitrogen oxide concentration is acquired. The monitoring is started when a fuel injection device restarts fuel injection after a fuel cut in a case where an air-fuel ratio most recently obtained by the gas sensor is larger than a predetermined threshold air-fuel ratio. The predetermined threshold air-fuel ratio is larger than a stoichiometric air-fuel ratio. Whether or not the temporarily increased amount is larger than a threshold amount is determined.

公开(公告)号：US20190383766A1

公开(公告)日：2019-12-19

申请号：US16438524

申请日：2019-06-12

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/406 ,  F01N11/00 ,  G01N27/409 ,  G01N27/41 ,  G01N27/416 ,  F01N3/20

Abstract: A first gas sensor includes a main pump cell that pumps oxygen inside a main oxygen concentration adjustment chamber, by applying a main pump voltage between a main interior side electrode and an exterior side electrode, and causing a main pump current to flow, a preliminary pump cell that pumps the oxygen inside a preliminary adjustment chamber by applying a preliminary pump voltage between an interior side preliminary electrode and the exterior side electrode, and causing a preliminary pump current to flow, and a constant control unit that controls the preliminary pump voltage of the preliminary pump cell in a manner so that the main pump current of the main pump cell becomes constant.

公开(公告)号：US20170138894A1

公开(公告)日：2017-05-18

申请号：US15290063

申请日：2016-10-11

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Noriko HIRATA ,  Yuki NAKAYAMA ,  Osamu NAKASONE

IPC: G01N27/407

Abstract: A mixed-potential gas sensor for measuring a concentration of a predetermined gas component of a measurement gas includes sensing electrodes mainly made of an oxygen-ion conductive solid electrolyte and located on a surface of a sensor element, and at least one reference electrode including a cermet including Pt and an oxygen-ion conductive solid electrolyte. The sensing electrodes each include a cermet including a noble metal and an oxygen-ion conductive solid electrolyte. The noble metal includes Pt and Au. A Au abundance ratio, which is an area ratio of a portion covered with the Au to a portion at which the Pt is exposed in a surface of noble metal particles forming each of the sensing electrodes, differs among the sensing electrodes. The gas sensor determines a concentration of the predetermined gas component based on a potential difference between each of the sensing electrodes and the at least one reference electrode.

公开(公告)号：US20170138893A1

公开(公告)日：2017-05-18

申请号：US15347086

申请日：2016-11-09

Applicant: NGK INSULATORS, LTD.

Inventor： Yuki NAKAYAMA ,  Noriko HIRATA ,  Taku OKAMOTO ,  Osamu NAKASONE

IPC: G01N27/407 ,  G01N27/30

Abstract: A gas sensor with excellent detection sensitivity is provided. A sensing electrode, which is provided in a mixed-potential gas sensor for measuring a concentration of a predetermined gas component of a measurement gas to sense the predetermined gas component, is formed of a cermet of a noble metal and an oxygen-ion conductive solid electrolyte. The noble metal includes Pt and Au. A range of at least 1.5 nm from a surface of a noble metal particle included in the sensing electrode is a Au enriched region having a Au concentration of 10% or more.

公开(公告)号：US20160161371A1

公开(公告)日：2016-06-09

申请号：US14953671

申请日：2015-11-30

Applicant: NGK INSULATORS, LTD.

Inventor： Osamu NAKASONE ,  Noriko HIRATA ,  Yuki NAKAYAMA

IPC: G01M15/10

CPC classification number: G01M15/102 ,  F01N3/103 ,  F01N3/106 ,  F01N11/00 ,  F01N2550/02 ,  F01N2560/023 ,  F01N2560/06 ,  F01N2900/1402 ,  F01N2900/1621 ,  F02D41/0235 ,  F02D41/1446 ,  F02D41/1459 ,  Y02T10/47

Abstract: A method for diagnosing the degree of deterioration of a catalyst disposed in an exhaust path of an internal combustion engine and oxidizes or adsorbs a target gas, including at least one of a hydrocarbon gas and a carbon monoxide gas, in an exhaust gas from the internal combustion engine, is adapted to determine whether deterioration exceeding an acceptable level of a catalyst occurs or not by comparing, at any timing when the internal combustion engine is in a state of a steady operation, the concentration of a target gas detected downstream from the catalyst in the exhaust path with a threshold value of the concentration of a target gas corresponding to the temperature of a catalyst at the timing which is previously defined according to an allowable range of an index value representing the degree of oxidation or adsorption at the catalyst corresponding to the temperature of a catalyst at the timing.

Abstract translation: 一种用于诊断设置在内燃机的排气路径中的催化剂的劣化程度的方法，其将来自内燃机的废气中的至少一种烃气体和一氧化碳气体的目标气体氧化或吸附 燃烧发动机适于通过比较在内燃机处于稳定运行状态的任何时刻，通过比较在催化剂下游检测的目标气体的浓度来确定超过催化剂的可接受水平的劣化是否发生 在排气路径中具有对应于催化剂的温度的目标气体的浓度的阈值，该阈值预先根据表示对应于催化剂的催化剂的氧化或吸附程度的指标值的允许范围来定义 催化剂在正时的温度。

公开(公告)号：US20160161370A1

公开(公告)日：2016-06-09

申请号：US14953592

申请日：2015-11-30

Applicant: NGK INSULATORS, LTD.

Inventor： Osamu NAKASONE ,  Noriko HIRATA ,  Yuki NAKAYAMA

IPC: G01M15/10

CPC classification number: G01M15/102 ,  F01N3/103 ,  F01N3/106 ,  F01N11/00 ,  F01N2550/02 ,  F01N2560/023 ,  F01N2560/06 ,  F01N2900/1402 ,  F01N2900/1404 ,  F01N2900/1621 ,  F02D41/0235 ,  F02D41/1446 ,  F02D41/1459 ,  Y02T10/47

Abstract: A system for diagnosing the degree of deterioration of a catalyst disposed in an exhaust path of an internal combustion engine and oxidizes or adsorbs a target gas in an exhaust gas, includes a temperature sensor measuring a temperature of the exhaust gas at the upstream from a catalyst in an exhaust path and a gas sensor detecting a target gas at the downstream of the exhaust path and outputting an output value in accordance with a concentration of the target gas, wherein a control element is configured to diagnose the degree of deterioration in the catalyst, based on at least the output value in the gas sensor, the temperature of the catalyst identified based on a measurement value in the temperature sensor, and the threshold value at the temperature of the catalyst.

Abstract translation: 一种用于诊断设置在内燃机的排气路径中的催化剂的劣化程度并对废气中的目标气体进行氧化或吸附的系统，包括测量催化剂上游的排气温度的温度传感器 在排气路径和气体传感器中，检测排气路径下游的目标气体，并根据目标气体的浓度输出输出值，其中，控制元件构成为对催化剂的劣化程度进行诊断， 至少基于气体传感器中的输出值，基于温度传感器中的测量值识别的催化剂的温度和催化剂温度下的阈值。

公开(公告)号：US20160033447A1

公开(公告)日：2016-02-04

申请号：US14800171

申请日：2015-07-15

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/407 ,  H01B1/02 ,  G01N27/30

CPC classification number: G01N27/4071 ,  G01N27/301 ,  G01N27/4075 ,  G01N27/4076 ,  H01B1/02

Abstract: A sensing electrode for sensing a predetermined gas component of a measurement gas, which is provided in a mixed-potential gas sensor that measures the concentration of the predetermined gas, component, is formed of a cermet containing a noble metal and an oxygen-ion conductive solid electrolyte. The noble metal comprisesPt and Au. An Au abundance ratio, which is an area ratio of a portion covered with Au to a portion at which Pt is exposed in a surface of noble metal particles forming the sensing electrode, is 0.3 or more.

Abstract translation: 用于感测测量气体的预定气体成分的感测电极由测量气体成分浓度的混合电位气体传感器组成，由含有贵金属和氧离子导电的金属陶瓷形成 固体电解质。 贵金属包括Pt和Au。 作为Au覆盖的部分的面积比与在Pt形成感应电极的贵金属粒子的表面露出的部分的面积比为0.3以上的Au丰度比。