公开(公告)号：US20200003726A1

公开(公告)日：2020-01-02

申请号：US16452593

申请日：2019-06-26

Applicant: NGK INSULATORS, LTD.

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

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

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：US20210054796A1

公开(公告)日：2021-02-25

申请号：US16986319

申请日：2020-08-06

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Osamu NAKASONE

IPC: F02D41/14 ,  G01N27/407 ,  G01N27/41

Abstract: In a method of performing active control between a lean operation state and a rich operation state on a vehicle engine including a three way catalyst in an exhaust path, on a downstream side with respect to the three way catalyst in the exhaust path, a limited current type NOx sensor having NH3 interference and also capable of detecting a change in an oxygen concentration on the downstream side is disposed, and an operation state of the vehicle engine is switched between a lean operation state and a rich operation state at a timing when a detection of a change in an oxygen concentration in an exhaust air flowing out from the three way catalyst or a detection of NOx or NH3 is performed first by the NOx sensor.

公开(公告)号：US20170138891A1

公开(公告)日：2017-05-18

申请号：US15347886

申请日：2016-11-10

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/407

Abstract: A gas sensor capable of measuring a high concentration range is provided. A sensing electrode provided in a sensor element of a mixed-potential gas sensor for measuring the concentration of a predetermined component in a measurement gas is formed of 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 Au to a portion at which Pt is exposed in a surface of noble metal particles forming the sensing electrode, is 0.1 or more and less than 0.3.

公开(公告)号：US20160160730A1

公开(公告)日：2016-06-09

申请号：US14953737

申请日：2015-11-30

Applicant: NGK INSULATORS, LTD.

Inventor： Osamu NAKASONE ,  Noriko HIRATA ,  Yuki NAKAYAMA

IPC: F01N11/00

CPC classification number: F01N11/002 ,  F01N3/103 ,  F01N3/106 ,  F01N11/00 ,  F01N2550/02 ,  F01N2560/023 ,  F01N2560/06 ,  F01N2900/1402 ,  F01N2900/1404 ,  F01N2900/1621 ,  F02D41/025 ,  F02D41/0295 ,  F02D41/1441 ,  F02D41/1459 ,  F02D41/22 ,  Y02T10/26 ,  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 the concentration of a target gas detected downstream from the catalyst in the exhaust path when a diagnosis-gas atmosphere containing a target gas higher in concentration than a target gas during a steady-operation state of the internal combustion engine is intentionally produced and introduced into the catalyst with a threshold value corresponding to the temperature of a catalyst at the timing which the diagnosis-gas atmosphere is introduced.

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，用于对来自内燃机的废气中的烃气体和一氧化碳气体中的至少一种的目标气体进行氧化或吸附 发动机适用于通过比较浓度比目标气体浓度高的目标气体的诊断气体气氛，通过比较在排气路径中的催化剂下游检测的目标气体的浓度来确定超过可接受的催化剂水平的劣化是否发生 有意地在内燃机的稳定运行状态下对目标气体产生并引入与催化剂的温度相应的阈值的阈值，该阈值在诊断气体气体导入的时刻。

公开(公告)号：US20140332379A1

公开(公告)日：2014-11-13

申请号：US14275048

申请日：2014-05-12

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/41

CPC classification number: G01N27/41 ,  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, the measurement gas is introduced into a third internal space through a third diffusion control part. With oxygen concentration equilibrium kept in the third internal space, hydrocarbon existing in the measurement gas that has reached the third internal space is all burned. Then, the concentration of the hydrocarbon gas component existing in the measurement gas is identified based on the magnitude of a current flowing between the measuring electrode and the main pumping electrode at that time.

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，测量气体通过第三扩散控制部分被引入第三内部空间。 当氧浓度平衡保持在第三内部空间时，已经到达第三内部空间的测量气体中存在的烃全部燃烧。 然后，基于当时在测量电极和主泵送电极之间流动的电流的大小来识别存在于测量气体中的烃气体组分的浓度。

公开(公告)号：US20230314366A1

公开(公告)日：2023-10-05

申请号：US18187049

申请日：2023-03-21

Applicant: NGK INSULATORS, LTD.

Inventor： Yuichiro KONDO ,  Osamu NAKASONE ,  Yusuke WATANABE

IPC: G01N27/41 ,  G01M15/10 ,  G01N27/409 ,  G01N27/27

CPC classification number: G01N27/41 ,  G01M15/102 ,  G01N27/409 ,  G01N27/27

Abstract: A sub adjustment pump cell pumps out oxygen from a measurement gas introduced into a sub adjustment chamber to the extent that H2O and CO2 contained in the measurement gas are not decomposed, a first pump cell pumps out oxygen from a first chamber so that substantially all of H2O and CO2 contained in the measurement gas introduced from the sub adjustment chamber into the first chamber are decomposed, concentrations of H2O and CO2 are identified from a pump-in current when H2 and CO generated by decomposition are oxidized in the second chamber and the third chamber, and a concentration of oxygen contained in the measurement gas is identified based on a magnitude of a current flowing between a sub adjustment inner electrode and an outer electrode at the time when the sub adjustment pump cell pumps out oxygen from the sub adjustment chamber.

公开(公告)号：US20210054774A1

公开(公告)日：2021-02-25

申请号：US16987435

申请日：2020-08-07

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Osamu NAKASONE

IPC: F01N11/00 ,  F01N3/10

Abstract: A system of diagnosing a deterioration of a catalyst, which includes a precious metal component and a ceramic part and purifies an exhaust gas emitted from an engine, includes: a diagnosis means comparing a diagnosis object value corresponding to an output from an NOx sensor provided on a downstream side with respect to the catalyst and a predetermined diagnosis threshold value stored in a storage means, thereby diagnosing a degree of deterioration of the catalyst, wherein the diagnosis threshold value is previously determined based on a correlationship between the diagnosis object value and a total weight value of NOx and THC in the exhaust gas through the catalyst in a state where the vehicle travels under a constant threshold value setting condition, and the diagnosis means diagnoses that a deterioration occurs in the precious metal component when the diagnosis object value exceeds the diagnosis threshold value.

公开(公告)号：US20200095917A1

公开(公告)日：2020-03-26

申请号：US16566922

申请日：2019-09-11

Applicant: NGK INSULATORS, LTD.

Inventor： Taku OKAMOTO ,  Osamu NAKASONE

IPC: F01N11/00 ,  F02D41/02

Abstract: A catalyst deterioration diagnosis system includes an air-fuel ratio detection element and a NOx detection element on a downstream side with respect to a catalyst, and a control element. The control element causes an engine to perform diagnosis operation performed with an exhaust gas temperature being kept at 600° C. or higher, such that at a timing when a downstream air-fuel ratio in a lean operation state reaches a threshold value, the engine is transitioned to a rich operation state, and at a timing that is a predetermined period after a downstream air-fuel ratio in a rich operation state reaches a threshold value, the engine is transitioned to a lean operation state. The diagnosis element compares NOx concentration during the rich operation state to a diagnosis threshold value, thereby to diagnose a degree of deterioration of NOx reduction capability of the catalyst.

公开(公告)号：US20170167994A1

公开(公告)日：2017-06-15

申请号：US15367334

申请日：2016-12-02

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/02 ,  G01N27/407

CPC classification number: G01N27/026 ,  G01N27/028 ,  G01N27/4071 ,  G01N27/4073 ,  G01N27/4075 ,  G01N27/4175

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：US20170059510A1

公开(公告)日：2017-03-02

申请号：US15245333

申请日：2016-08-24

Applicant: NGK INSULATORS, LTD.

Inventor： Osamu NAKASONE ,  Noriko HIRATA ,  Takayuki SAKURAI

IPC: G01N27/406 ,  G01N27/416 ,  G01N27/407

CPC classification number: G01N27/4067

Abstract: Provided is a method for recovering output of a gas sensor in shorter time. The method includes: determining a recovering temperature T1 and a recovering time Δτ1 based on a condition setting range where a high recovery rate is expected; and recovering the output based on T1 and Δτ1, wherein in the recovering, a duty ratio for a heater is instantly increased to value D1 higher than a value in a normal driving mode when the recovering starts, D1 is maintained up to T1, and PID control is performed by reducing the duty ratio to value D2 to maintain T1. After an elapse of Δτ1, the duty ratio is reduced to value D3. When the temperature of the element reaches a value 1 to 1.2 times as high as the temperature in the normal drive mode, the duty ratio is instantly changed to value D0 in the normal drive mode.

Abstract translation: 提供了一种在较短时间内恢复气体传感器的输出的方法。 该方法包括：基于期望高回收率的条件设定范围，确定恢复温度T1和恢复时间Δτ1; 并且恢复基于T1和Δτ1的输出，其中在恢复时，当恢复开始时，加热器的占空比立即增加到高于正常驱动模式中的值的D1，D1保持到T1，并且PID 通过将占空比降低到值D2来进行控制，以维持T1。 经过Δτ1后，占空比降至D3值。 当元件的温度达到正常驱动模式下的温度的1至1.2倍的值时，在正常驱动模式中占空比立即变为值D0。