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公开(公告)号：US11060439B2
公开(公告)日：2021-07-13
申请号：US16987435
申请日：2020-08-07
申请人： NGK INSULATORS, LTD.
发明人： Taku Okamoto , Osamu Nakasone
摘要： 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.
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公开(公告)号：US10895189B2
公开(公告)日：2021-01-19
申请号：US16555003
申请日：2019-08-29
申请人： NGK INSULATORS, LTD.
发明人： Taku Okamoto , Osamu Nakasone , Kosuke Monna
摘要： 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.
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公开(公告)号：US11274592B2
公开(公告)日：2022-03-15
申请号：US16594240
申请日：2019-10-07
申请人： NGK INSULATORS, LTD.
发明人： Osamu Nakasone , Kosuke Monna
摘要： A catalyst deterioration diagnosis device includes: a unit configured to obtain a temperature of a catalyst; a unit configured to obtain a sensor output from a gas sensor disposed between the catalyst and an exhaust port; and a unit configured to determine the catalyst to be faulty when the temperature of the catalyst obtained when the sensor output becomes a preset evaluative output is equal to or higher than an evaluative catalyst temperature.
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公开(公告)号：US10196958B2
公开(公告)日：2019-02-05
申请号：US14953737
申请日：2015-11-30
申请人： NGK INSULATORS, LTD.
发明人： Osamu Nakasone , Noriko Hirata , Yuki Nakayama
摘要： 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.
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公开(公告)号：US10101294B2
公开(公告)日：2018-10-16
申请号：US15245333
申请日：2016-08-24
申请人： NGK INSULATORS, LTD.
发明人： Osamu Nakasone , Noriko Hirata , Takayuki Sakurai
IPC分类号： G01N27/406 , G01N27/407 , G01N27/416
摘要： 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.
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公开(公告)号：US10527569B2
公开(公告)日：2020-01-07
申请号：US15367334
申请日：2016-12-02
申请人： NGK INSULATORS, LTD.
发明人： Taku Okamoto , Yuki Nakayama , Kosuke Monna , Osamu Nakasone
IPC分类号： G01N27/02 , G01N27/407
摘要： 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).
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公开(公告)号：US10514355B2
公开(公告)日：2019-12-24
申请号：US15290063
申请日：2016-10-11
申请人： NGK INSULATORS, LTD.
发明人： Taku Okamoto , Noriko Hirata , Yuki Nakayama , Osamu Nakasone
IPC分类号： G01N27/407 , G01N27/419
摘要： 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.
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公开(公告)号：US11680926B2
公开(公告)日：2023-06-20
申请号：US17170940
申请日：2021-02-09
申请人： NGK INSULATORS, LTD.
发明人： Taku Okamoto , Yuichiro Kondo , Osamu Nakasone
IPC分类号： G01N27/41 , G01N27/406
CPC分类号： G01N27/41 , G01N27/4062 , G01N27/4065 , G01N27/4067
摘要： 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.
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公开(公告)号：US11378542B2
公开(公告)日：2022-07-05
申请号：US16452714
申请日：2019-06-26
申请人： NGK INSULATORS, LTD.
发明人： Osamu Nakasone , Taku Okamoto , Nobukazu Ikoma
IPC分类号： G01N27/407 , G01N27/41 , G01N33/00
摘要： 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.
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公开(公告)号：US11333055B2
公开(公告)日：2022-05-17
申请号：US16555005
申请日：2019-08-29
申请人： NGK INSULATORS, LTD.
发明人： Taku Okamoto , Osamu Nakasone
摘要： 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.
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