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公开(公告)号：US11249045B2
公开(公告)日：2022-02-15
申请号：US16226687
申请日：2018-12-20
申请人： NGK INSULATORS, LTD.
发明人： Kunihiko Nakagaki
IPC分类号： G01N27/409 , G01N27/419 , G01N33/00 , F01N3/20 , F01N11/00 , G01N27/41
摘要： A gas sensor, and a method for measuring the concentrations of a plurality of target components in a gas to be measured are disclosed. The gas sensor is provided with: a specific component measurement means which measures the concentration of a specific component in a measurement chamber; a preliminary oxygen concentration control means which controls the oxygen concentration in a preliminary adjustment chamber; a drive control means which controls the driving and stopping of the preliminary oxygen concentration control means; and a target component acquisition means which, on the basis of the difference between sensor outputs from the specific component measurement means when the preliminary oxygen concentration control means is being driven and when the preliminary oxygen concentration control means is stopped, and one of the respective sensor outputs, acquires the concentrations of a first target component and a second target component.
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公开(公告)号：US11125719B2
公开(公告)日：2021-09-21
申请号：US16701186
申请日：2019-12-03
申请人： NGK INSULATORS, LTD.
发明人： Kunihiko Nakagaki
IPC分类号： G01N27/419 , G01N27/407 , G01N27/409
摘要： A gas sensor is capable of measuring the concentrations of each of a plurality of target components in a gas being measured. The gas sensor has a sensor element, and one or more processors configured to control an oxygen concentration and to acquire a target component concentration. The oxygen concentration is controlled in a first chamber and a second chamber of a first sensor cell, and the oxygen concentration is also controlled in a second chamber of a second sensor cell. The concentration of a second target component is acquired on the basis of a difference ΔIp between a first pump current value and a second pump current value, and the concentration of a first target component is acquired by subtracting the concentration of the second target component from the second pump current value (total concentration).
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公开(公告)号：US11378543B2
公开(公告)日：2022-07-05
申请号：US16452584
申请日：2019-06-26
申请人： NGK INSULATORS, LTD.
IPC分类号： G01N27/419 , G01N27/407 , F01N11/00 , G01N33/00 , G01N27/409
摘要： A gas sensor includes an element body, an inner main pump electrode, an inner auxiliary pump electrode, an inner preliminary pump electrode, a measurement electrode, a reference electrode, a measurement voltage detection device, a specific gas concentration detection device. The inner preliminary pump electrode, the inner main pump electrode, the inner auxiliary pump electrode and the measurement electrode include each contain a noble metal having catalytic activity. At least one of the inner preliminary pump electrode and the inner main pump electrode contains no noble metal having a catalytic activity suppression ability, the catalytic activity suppression ability being an ability to suppress the catalytic activity of the noble metal having the catalytic activity from being exhibited to the specific gas. The inner auxiliary pump electrode contains a noble metal having the catalytic activity suppression ability.
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公开(公告)号：US11060996B2
公开(公告)日：2021-07-13
申请号：US16228827
申请日：2018-12-21
申请人： NGK INSULATORS, LTD.
发明人： Kunihiko Nakagaki , Dietmar Schmitt
IPC分类号： G01N27/407 , G01N27/416 , G01N33/00 , G01N27/409 , G01N27/417
摘要： A gas sensor, and a method for measuring the concentrations of a plurality of target components in a gas to be measured are disclosed. The gas sensor is provided with: an oxygen concentration control means for controlling the oxygen concentration in an oxygen concentration adjustment chamber; a temperature control means for controlling the temperature of a sensor element; a condition setting means which sets the oxygen concentration of the oxygen concentration adjustment chamber and/or the temperature of the sensor element to conditions corresponding to the types of target components in the introduced gas to be measured; and a concentration calculation means which calculates the concentrations of the different target components on the basis of the respective sensor outputs obtained under the plurality of conditions corresponding to the types of target components.
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公开(公告)号：US11054381B2
公开(公告)日：2021-07-06
申请号：US16438524
申请日：2019-06-12
申请人： NGK INSULATORS, LTD.
IPC分类号： G01N27/406 , F01N11/00 , G01N27/41 , G01N27/416 , G01N27/409 , F01N3/20
摘要： 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.
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公开(公告)号：US11293894B2
公开(公告)日：2022-04-05
申请号：US16438530
申请日：2019-06-12
申请人： NGK INSULATORS, LTD.
发明人： Kunihiko Nakagaki , Taku Okamoto , Nobukazu Ikoma
IPC分类号： G01N27/41 , G01N27/407
摘要： A gas sensor includes a structural body made up from a solid electrolyte that exhibits oxygen ion conductivity, a gas introduction port formed in the structural body, a preliminary chamber communicating with the gas introduction port and equipped with a preliminary pump electrode, a main chamber communicating with the preliminary chamber and equipped with a main pump electrode, and a measurement chamber communicating with the main chamber and equipped with a measurement electrode. In the gas sensor, at least a surface of the preliminary pump electrode is made of a material which exhibits a low activity with respect to a reaction between ammonia and oxygen.
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公开(公告)号：US10830119B2
公开(公告)日：2020-11-10
申请号：US16226688
申请日：2018-12-20
申请人： NGK INSULATORS, LTD.
发明人： Kunihiko Nakagaki
摘要： An exhaust gas purification system and an exhaust gas purification method are disclosed. The exhaust gas purification system is provided with: an injector for injecting urea water, said injector being installed between a combustion device and a selective catalytic reduction (SCR) catalyst; a first gas sensor which is installed downstream of the SCR catalyst, and which detects the NO concentration and the NH3 concentration in exhaust gas outputted from the SCR catalyst; and an opening amount control means for controlling the opening amount of the injector for injecting urea water.
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