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    GAS SENSOR AND CONCENTRATION MEASUREMENT METHOD USING GAS SENSOR
    71.
    发明公开
    GAS SENSOR AND CONCENTRATION MEASUREMENT METHOD USING GAS SENSOR 审中-公开

    公开(公告)号：US20230314367A1

    公开(公告)日：2023-10-05

    申请号：US18187108

    申请日：2023-03-21

    申请人： NGK INSULATORS, LTD.

    发明人： Yuichiro KONDO ,  Taku OKAMOTO

    IPC分类号： G01N27/41 ,  G01M15/10 ,  G01N27/27

    CPC分类号： G01N27/41 ,  G01M15/102 ,  G01N27/27

    摘要： A sensor element includes first to third chambers communicating sequentially from a gas inlet, voltages are intermittently applied across inner electrodes facing the respective chambers and a reference pump electrode to perform pumping of oxygen between a measurement gas and the reference pump electrode being in contact with a reference gas, thereby to reduce H2O and CO2 in the measurement gas into H2 and CO in the first chamber, to oxidize H2 into H2O in the second chamber, to oxidize CO into CO2 in the third chamber, and to identify a concentration of H2O and a concentration of CO2 based on a pumping-in current at the time when electromotive force between an inner electrode and the reference pump electrode during non-application of a voltage is maintained at a target value.

    Gas sensor control device
    72.
    发明授权
    Gas sensor control device 有权

    公开(公告)号：US11774403B2

    公开(公告)日：2023-10-03

    申请号：US16782404

    申请日：2020-02-05

    申请人： DENSO CORPORATION

    发明人： Shoki Shimizu ,  Ryozo Kayama ,  Yuki Murayama

    IPC分类号： G01N27/419 ,  G01N27/407 ,  G01N27/406 ,  G01N27/41 ,  G01N33/00

    CPC分类号： G01N27/419 ,  G01N27/4067 ,  G01N27/4074 ,  G01N27/41 ,  G01N33/0037

    摘要： A first cell includes a first electrode in a measurement gas chamber and a second electrode in a reference gas chamber. A second cell includes a third electrode in the measurement gas chamber and a fourth electrode in the reference gas chamber to cause a current therebetween that corresponds to a concentration of a specific gas component in detected gas in the measurement chamber. A controller selectively implements a normal control and a reduction control. The normal control is to apply a lower voltage to the first electrode and the second electrode to remove oxygen from the detected gas. The reduction control is to apply a higher voltage to the first electrode and the second electrode to reduce the third electrode that is oxidized. The controller prohibits implementation of the reduction control on determination that implementation of the reduction control.

    SENSOR CONTROL UNIT
    73.
    发明公开
    SENSOR CONTROL UNIT 审中-公开

    公开(公告)号：US20230176005A1

    公开(公告)日：2023-06-08

    申请号：US18161449

    申请日：2023-01-30

    申请人： DENSO CORPORATION

    发明人： Go MIYAGAWA ,  Kazuki YAGI ,  Kei SUGIURA

    IPC分类号： G01N27/406 ,  G01N27/409 ,  G01N27/419

    CPC分类号： G01N27/4067 ,  G01N27/409 ,  G01N27/419 ,  G01N27/41

    摘要： The sensor control unit is used for a gas sensor disposed in an exhaust pipe in an engine as an internal combustion engine of a vehicle. The gas sensor includes a sensor cell having an exhaust gas electrode, an atmosphere side electrode and a solid electrolyte, and a heater that heats the sensor cell. The sensor control unit includes a heater control unit that controls a heater to heat a sensor cell. The heater control unit heats the sensor cell to be at an operation control temperature during the combustion operation of the engine and heats the sensor cell to be at an operation stop control temperature which is higher than the operation control temperature.

    DIAGNOSIS SYSTEM OF INTERNAL COMBUSTION ENGINE
    76.
    发明申请
    DIAGNOSIS SYSTEM OF INTERNAL COMBUSTION ENGINE 审中-公开

    公开(公告)号：US20180142639A1

    公开(公告)日：2018-05-24

    申请号：US15864312

    申请日：2018-01-08

    申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

    发明人： Hiroshi MIYAMOTO ,  Keiichiro AOKI ,  Yasushi IWAZAKI

    IPC分类号： F02D41/14 ,  F02D41/12 ,  F02D41/22 ,  F01N3/10 ,  G01N27/41

    CPC分类号： F02D41/1495 ,  F01N3/10 ,  F01N3/106 ,  F02D41/126 ,  F02D41/1439 ,  F02D41/1456 ,  F02D41/222 ,  G01N27/41

    摘要： An internal combustion engine comprises an exhaust purification catalyst and an air-fuel ratio sensor arranged at a downstream side of the exhaust purification catalyst, stops or decreases a feed of fuel as fuel cut control, and controls an air-fuel ratio of exhaust gas to a rich air-fuel ratio after the end of the fuel cut control as post reset rich control. The diagnosis system calculates a first characteristic of change of air-fuel ratio at the time when the output air-fuel ratio first passes a first air-fuel ratio region leaner than a stoichiometric air-fuel ratio and a second characteristic of change of air-fuel ratio at the time when the output air-fuel ratio first passes a second air-fuel ratio region including a stoichiometric air-fuel ratio. The diagnosis system diagnoses the abnormality of the air-fuel ratio sensor based on the first characteristic of change of air-fuel ratio and the second characteristic of change of air-fuel ratio. As a result, it is possible to suppress the effects of the change of state of the exhaust purification catalyst while accurately diagnosing the abnormality of deterioration of response of a downstream side air-fuel ratio sensor.

    GAS SENSOR
    78.
    发明申请
    GAS SENSOR 审中-公开

    公开(公告)号：US20180031518A1

    公开(公告)日：2018-02-01

    申请号：US15550469

    申请日：2016-02-12

    申请人： DENSO CORPORATION

    发明人： Takehito KIMATA ,  Yuusuke TOUDOU ,  Yuusuke KAWAMOTO

    IPC分类号： G01N27/416 ,  G01N27/41 ,  G01N27/409 ,  G01N27/417 ,  G01N27/406 ,  G01N27/419

    CPC分类号： G01N27/416 ,  G01M15/104 ,  G01M15/106 ,  G01N27/4067 ,  G01N27/409 ,  G01N27/41 ,  G01N27/4175 ,  G01N27/419 ,  G01N33/0016

    摘要： A gas sensor is equipped with a solid electrolyte body, a pump electrode, a sensor electrode, and a heater. In the gas sensor, a region of the whole of a front end portion of a heater base in which a heating element is disposed is broken down into three regions: an intermediate region defined between a front end and a base end of the sensor electrode, a front end region located closer to a front end side than the intermediate region is, and a base end region located closer to a base end side than the intermediate region is. A resistance value per unit area of a heating element lying in the base end region and a resistance value per unit area of the heating element lying in the front end region is selected to be higher than that of the heating element lying in the intermediate region, thereby keeping the temperature of a region around the sensor electrode at a desired level even when the temperature of gas changes.

    GAS SENSOR
    80.
    发明申请
    GAS SENSOR 审中-公开

    公开(公告)号：US20170315082A1

    公开(公告)日：2017-11-02

    申请号：US15521967

    申请日：2015-10-20

    申请人： DENSO CORPORATION

    发明人： Yuusuke KAWAMOTO ,  Yuusuke TOUDOU ,  Takashi ARAKI

    IPC分类号： G01N27/41 ,  G01N27/407 ,  G01N27/406

    CPC分类号： G01N27/41 ,  G01N27/4067 ,  G01N27/4077 ,  G01N27/4078

    摘要： A gas sensor is equipped with a housing, an insulator retained by an inner periphery of the housing, a sensing device having a front end portion protruding from a front end surface of the insulator, and a protective cover which covers a front end portion of the sensing device. A pump electrode and a sensor electrode are disposed in a front end portion of the solid electrolyte body. The pump electrode is exposed to a measurement gas and regulates the concentration of oxygen in the measurement gas. The sensor electrode is exposed to the measurement gas and measures the concentration of a given gas component in the measurement gas after being regulated in concentration of oxygen by the pump electrode. A base end portion of the sensor electrode in a lengthwise direction is located closer to a base end side of the gas sensor than a front end surface of the housing is. This minimizes a variation in temperature of the sensor electrode and enhances the accuracy in measuring the concentration of the given gas component.