公开(公告)号：US20240230582A9

公开(公告)日：2024-07-11

申请号：US18489293

申请日：2023-10-18

申请人： NGK INSULATORS, LTD.

发明人： Yusuke WATANABE ,  Yohei GORO

IPC分类号： G01N27/409 ,  G01N27/30 ,  G01N27/406 ,  G01N27/41 ,  G01N27/419 ,  G01N33/00

CPC分类号： G01N27/409 ,  G01N27/301 ,  G01N27/4067 ,  G01N27/41 ,  G01N27/419 ,  G01N33/0037

摘要： A gas sensor includes: an element body which is internally provided with a measurement-object gas flow portion; a first pump cell including a first inner electrode disposed in the measurement-object gas flow portion; a second pump cell including a second inner electrode disposed in the measurement-object gas flow portion; a heater; a first impedance measurer configured to measure a first impedance by applying a voltage to the first inner electrode; a second impedance measurer configured to measure a second impedance by applying a voltage to the second inner electrode; and a control apparatus configured to perform a heater control process of controlling the heater so that the first impedance reaches a target value, and a correction process of correcting, based on the second impedance, a second pump current which flows through the second pump cell or a value derived based on the second pump current.

公开(公告)号：US20240133839A1

公开(公告)日：2024-04-25

申请号：US18489293

申请日：2023-10-17

申请人： NGK INSULATORS, LTD.

发明人： Yusuke WATANABE ,  Yohei GORO

IPC分类号： G01N27/409 ,  G01N27/30 ,  G01N27/406 ,  G01N27/41 ,  G01N27/419 ,  G01N33/00

CPC分类号： G01N27/409 ,  G01N27/301 ,  G01N27/4067 ,  G01N27/41 ,  G01N27/419 ,  G01N33/0037

摘要： A gas sensor includes: an element body which is internally provided with a measurement-object gas flow portion; a first pump cell including a first inner electrode disposed in the measurement-object gas flow portion; a second pump cell including a second inner electrode disposed in the measurement-object gas flow portion; a heater; a first impedance measurer configured to measure a first impedance by applying a voltage to the first inner electrode; a second impedance measurer configured to measure a second impedance by applying a voltage to the second inner electrode; and a control apparatus configured to perform a heater control process of controlling the heater so that the first impedance reaches a target value, and a correction process of correcting, based on the second impedance, a second pump current which flows through the second pump cell or a value derived based on the second pump current.

公开(公告)号：US20230349855A1

公开(公告)日：2023-11-02

申请号：US18185593

申请日：2023-03-17

申请人： NGK INSULATORS, LTD.

发明人： Yuichiro KONDO

IPC分类号： G01N27/416 ,  G01N27/409 ,  G01N27/407 ,  G01N27/419

CPC分类号： G01N27/4162 ,  G01N27/4073 ,  G01N27/409 ,  G01N27/419

摘要： A CO2 mass estimation system includes: an acquisition element acquiring detected values in accordance with concentrations of oxygen, H2O, and CO2 contained in an engine exhaust gas output from a gas sensor; a setting element setting an air-fuel ratio of a mixture; and a calculation element calculating the mass of CO2 contained in the exhaust gas, wherein the calculation element calculates the concentrations of oxygen, H2O, and CO2 contained in the exhaust gas based on the sensor detected values, acquires concentrations of oxygen and H2O in air and the air-fuel ratio, calculates a composition ratio of at least C atoms contained in fuel based on the concentrations in the exhaust gas, the concentrations in the air, and the air-fuel ratio, and estimates the mass of CO2 contained in the exhaust gas based on the composition ratio and the amount of injection of the fuel into the engine.

公开(公告)号：US11686700B2

公开(公告)日：2023-06-27

申请号：US16701185

申请日：2019-12-03

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe

IPC分类号： G01N27/407 ,  G01N27/419 ,  G01N27/30 ,  G01N27/41 ,  G01N27/409

CPC分类号： G01N27/4072 ,  G01N27/301 ,  G01N27/409 ,  G01N27/4073 ,  G01N27/4077 ,  G01N27/41 ,  G01N27/419

摘要： A gas sensor includes an element body having an oxygen ion conductive solid electrolyte layer and internally provided with a measurement-object gas flow section that introduces a measurement-object gas and allows the gas to flow; a measurement-object gas-side electrode disposed in a portion of the element body, the portion being exposed to the measurement-object gas; and a reference electrode disposed inside of the element body. Let A [μA] be a limiting current when oxygen is pumped from the surroundings of the measurement-object gas-side electrode to the surroundings of the reference electrode with the measurement-object gas introduction section, and B [μA] be a limiting current when oxygen is pumped from the surroundings of the reference electrode to the surroundings of the measurement-object gas-side electrode with the reference gas introduction section, then a ratio A/B is greater than or equal to 0.005.

公开(公告)号：US20230194467A1

公开(公告)日：2023-06-22

申请号：US18079027

申请日：2022-12-12

申请人： NGK INSULATORS, LTD.

发明人： Yusuke WATANABE ,  Daichi ICHIKAWA

IPC分类号： G01N27/419 ,  G01N27/407 ,  G01N27/409 ,  G01N27/41 ,  G01N33/00

CPC分类号： G01N27/419 ,  G01N27/4071 ,  G01N27/4074 ,  G01N27/409 ,  G01N27/41 ,  G01N33/0037

摘要： A gas sensor includes a sensor element and a control unit for controlling the sensor element. The sensor element includes a main pump cell, an auxiliary pump cell, a measurement pump cell, and a reference electrode, wherein, in the main pump cell, a repeatedly on-off controlled main pump current is applied so that an auxiliary pump current flowing through the auxiliary pump cell is at a predetermined target current value, and, in the auxiliary pump cell, the auxiliary pump current is applied so that an electromotive force between an inner auxiliary pump electrode and the reference electrode is at a predetermined target voltage value. The control unit includes: a control power supply for applying the repeatedly on-off controlled main pump current; and a setting part for setting the target voltage value based on an electric potential difference generated between the inner main pump electrode and the reference electrode.

公开(公告)号：US11668670B2

公开(公告)日：2023-06-06

申请号：US17143188

申请日：2021-01-07

申请人： NGK INSULATORS, LTD.

发明人： Daichi Ichikawa ,  Taku Okamoto

IPC分类号： G01N27/409 ,  G01N27/41 ,  G01N27/407 ,  G01N27/419

CPC分类号： G01N27/409 ,  G01N27/4073 ,  G01N27/41 ,  G01N27/419

摘要： A gas sensor includes a main pump cell, a storage unit that stores information about a zero point in a first correspondence relationship, where the first correspondence relationship is a linear correspondence relationship between the oxygen concentration in a measurement-object gas and the main pump current, an oxygen-concentration-detecting unit that detects the oxygen concentration in a measurement-object gas, based on a measured value p of the main pump current and the information about the zero point, and a measured-value-obtaining unit that performs a second control process and that obtains a measured value b1 at a measurement point B1 at which a known value of the oxygen concentration and the main pump current are relevant to each other with a measurement timing. The oxygen-concentration-detecting unit makes zero point correction such that a divergence of the zero point from the first correspondence relationship is corrected based on the measured value b1.

公开(公告)号：US11567034B2

公开(公告)日：2023-01-31

申请号：US17205189

申请日：2021-03-18

申请人： NGK INSULATORS, LTD.

发明人： Daichi Ichikawa ,  Yuichiro Kondo ,  Nobuhiko Mori

IPC分类号： G01N27/409 ,  F01N11/00 ,  F01N3/20 ,  G01N27/41 ,  G01N33/00 ,  G01N27/419

摘要： A first gas sensor having a first sensor element includes a first protective cover that protects the first sensor element, and a second gas sensor having a second sensor element includes a second protective cover that protects the second sensor element. The first protective cover is coated with an oxidation catalyst for one target component from among a plurality of target components, and the second protective cover is coated with an inert catalyst for the one target component.

公开(公告)号：US20220283115A1

公开(公告)日：2022-09-08

申请号：US17630209

申请日：2020-10-08

申请人： NGK SPARK PLUG CO., LTD.

发明人： Yuzo HIGUCHI ,  Yuji OI ,  Satoru TODA ,  Satoru ABE ,  Junichiro MITSUNO ,  Hidetoshi MAKINO

IPC分类号： G01N27/419 ,  G01R19/252 ,  G01M15/10

摘要： A sensor system (1, 1S) including a current DA converter (42) outputting a control current (Ip) of a sensor element (3S), a control unit (4C) generating a control current instruction value (Ipcmd) corresponding to magnitude of the control current and inputting this instruction value to the current DAC, an instruction value sequence generating unit (47) generating, instead of the control current instruction value, an inspection instruction value sequence (RChcmd) in which predetermined inspection current instruction values (Chcmd) inputted to the current DAC are arranged in order and by which failure of the current DAC can be detected, an inspection current detection unit (71) detecting an inspection current value (Ichv) of an inspection current (Ich) outputted from the current DAC, and a failure detection unit (8) detecting failure of the current DAC from an inspection current value sequence (RIchv) in which the inspection current values are arranged in order of detection.

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.

发明人： Kunihiko Nakagaki ,  Taku Okamoto ,  Osamu Nakasone ,  Nobukazu Ikoma

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.

公开(公告)号：US20220178869A1

公开(公告)日：2022-06-09

申请号：US17531870

申请日：2021-11-22

申请人： NGK INSULATORS, LTD.

发明人： Taku OKAMOTO ,  Soichiro YOSHIDA ,  Ryo HASHIKAWA

IPC分类号： G01N27/409 ,  G01N27/30 ,  G01N27/41 ,  G01N33/00 ,  G01N27/406 ,  G01N27/419

摘要： A gas sensor includes a sensor element including an element body, a measurement pump cell being configured to pump out oxygen from surroundings of an inner measurement electrode to surroundings of an outer measurement electrode, and a measurement voltage detection sensor cell that detects a measurement voltage between a reference electrode and the inner measurement electrode, and a pump cell controller that executes a normal time measurement pump control process of pumping out oxygen in the measurement chamber during a normal operation time of the sensor element so that the measurement voltage reaches a normal time target value, and executes a start-up time measurement pump control process of pumping out oxygen in the measurement chamber at a start-up time of the sensor element earlier than the normal operation time so that the measurement voltage reaches a start-up time target value higher than the normal time target value.