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    GAS SENSOR
    21.
    发明公开
    GAS SENSOR 审中-公开

    公开(公告)号：US20240192160A1

    公开(公告)日：2024-06-13

    申请号：US18414696

    申请日：2024-01-17

    Applicant: NGK INSULATORS, LTD.

    Inventor： Daichi ICHIKAWA ,  Taku OKAMOTO

    IPC: G01N27/409 ,  G01N27/41 ,  G01N27/419

    CPC classification number: G01N27/409 ,  G01N27/41 ,  G01N27/419

    Abstract: A gas sensor includes: a sensor element including an element body which is internally provided with a measurement-object gas flow portion that introduces a measurement-object gas and causes the measurement-object gas to flow, a measurement pump cell having an inner measurement electrode disposed in a measurement chamber and an adjustment pump cell that adjusts an oxygen concentration in an oxygen concentration adjustment chamber, a necessity determiner that performs a refresh necessity determination process of determining necessity of a refresh of the sensor element based on at least one of undershoot or overshoot at a time of rapid change in a measurement pump current; and a refresh controller that, upon a determination that the refresh is necessary in the refresh necessity determination process, performs a refresh process including at least one of an adjustment pump control process during refresh or a measurement pump control process during refresh.

    GAS SENSOR
    22.
    发明申请
    GAS SENSOR 有权

    公开(公告)号：US20220283114A1

    公开(公告)日：2022-09-08

    申请号：US17825062

    申请日：2022-05-26

    Applicant: NGK INSULATORS, LTD.

    Inventor： Taku OKAMOTO ,  Soichiro YOSHIDA ,  Ryo HASHIKAWA

    IPC: G01N27/407

    Abstract: A gas sensor includes a sensor element and a pump cell controller. The pump cell controller performs a normal time control process after a heater control process is started, the normal time control process including a main pump control process, an auxiliary pump control process of controlling an auxiliary pump cell so that a voltage for auxiliary pump reaches a target value, and a normal time measurement pump control process of pumping out oxygen in a measurement chamber by controlling the measurement pump cell so that a measurement voltage reaches a normal time target value. In an early stage of the normal time control process, the pump cell controller performs a correction process of correcting the target value of the voltage for auxiliary pump to a value higher than a target value in a period after the early stage.

    CATALYST DETERIORATION DIAGNOSIS SYSTEM AND CATALYST DETERIORATION DIAGNOSIS METHOD
    23.
    发明申请
    CATALYST DETERIORATION DIAGNOSIS SYSTEM AND CATALYST DETERIORATION DIAGNOSIS METHOD 有权

    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.

    CATALYST DETERIORATION DIAGNOSIS SYSTEM AND CATALYST DETERIORATION DIAGNOSIS METHOD
    24.
    发明申请
    CATALYST DETERIORATION DIAGNOSIS SYSTEM AND CATALYST DETERIORATION DIAGNOSIS METHOD 审中-公开

    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.

    CATALYST DEGRADATION DIAGNOSTIC METHOD AND CATALYST DEGRADATION DIAGNOSTIC SYSTEM
    26.
    发明申请
    CATALYST DEGRADATION DIAGNOSTIC METHOD AND CATALYST DEGRADATION DIAGNOSTIC SYSTEM 审中-公开

    公开(公告)号：US20180209873A1

    公开(公告)日：2018-07-26

    申请号：US15869507

    申请日：2018-01-12

    Applicant: NGK INSULATORS, LTD.

    Inventor： Kosuke MONNA ,  Taku OKAMOTO

    IPC: G01M15/10 ,  F01N3/10

    Abstract: A method of diagnosing a degree of degradation of a catalyst located along an exhaust path of an internal combustion engine, and oxidizing or adsorbing a target gas included in an exhaust gas and including at least one of HC and CO is disclosed. The method includes: a) determining whether an oxygen concentration of the exhaust gas is in a range of 15% to 20% or whether the oxygen concentration is 10% or more and varies in a range of ±2% or less of a predetermined value in a predetermined period of time; and b) diagnosing whether the catalyst is degraded when criteria in the step a) are satisfied. The step b) is performed by comparing a diagnostic indicator value calculated using an output value from a target gas detection component provided at a location downstream from the catalyst and a threshold corresponding to temperature of the catalyst.

    GAS SENSOR
    29.
    发明申请
    GAS SENSOR 审中-公开

    公开(公告)号：US20180100828A1

    公开(公告)日：2018-04-12

    申请号：US15726583

    申请日：2017-10-06

    Applicant: NGK INSULATORS, LTD.

    Inventor： Taku OKAMOTO ,  Nobuhiko MORI ,  Yuki NAKAYAMA

    IPC: G01N27/407 ,  G01N27/30 ,  G01N27/419

    CPC classification number: G01N27/4072 ,  G01N27/301 ,  G01N27/4074 ,  G01N27/4075 ,  G01N27/419

    Abstract: Provided is a gas sensor having simpler configuration than a conventional multi-gas sensor, and being capable of measuring NOx and NH3 simultaneously. In the gas sensor determining a NOx concentration in a measurement gas based on a pump current flowing between a NOx measurement electrode and an outer pump electrode, the outer pump electrode has catalytic activity inactivated for NH3 so that a sensor element further includes a NH3 sensor part having a mixed potential cell constituted by the outer pump electrode, a reference electrode, and a solid electrolyte between these electrodes, and determination of a NH3 concentration based on a potential difference occurring between the outer pump electrode and the reference electrode and determination of a NOx concentration based on the pump current and the NH3 concentration can be performed simultaneously or selectively when the sensor element is heated to 400° C. or higher and 600° C. or lower.

    GAS SENSOR
    30.
    发明申请
    GAS SENSOR 审中-公开

    公开(公告)号：US20180074009A1

    公开(公告)日：2018-03-15

    申请号：US15697952

    申请日：2017-09-07

    Applicant: NGK INSULATORS, LTD.

    Inventor： Taku OKAMOTO ,  Nobuhiko MORI ,  Takayuki SEKIYA

    IPC: G01N27/407 ,  G01N33/00

    Abstract: A sensor element includes a NOx sensor part, a NH3 gas sensor part, and a single common electrode shared by the both parts. The former has a pump cell including a measurement electrode facing an internal space, a pump electrode formed on a surface of the element, and a solid electrolyte therebetween. The latter includes a sensing electrode formed on a surface of the element and having catalytic activity inactivated for a NH3 gas. The common electrode is located to be in contact with a reference gas. The NOx concentration is determined based on a potential difference occurring between the sensing electrode and the common electrode, and a current flowing through the pump cell in a state of controlling a voltage applied across the electrodes to maintain a potential difference between the measurement electrode and the common electrode constant.

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