公开(公告)号：US20240192160A1

公开(公告)日：2024-06-13

申请号：US18414696

申请日：2024-01-17

申请人： NGK INSULATORS, LTD.

发明人： Daichi ICHIKAWA ,  Taku OKAMOTO

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

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

摘要： 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.

公开(公告)号：US11946897B2

公开(公告)日：2024-04-02

申请号：US15766485

申请日：2016-09-28

申请人： DENSO CORPORATION

发明人： Yoshihide Segawa ,  Junta Zushi

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

CPC分类号： G01N27/41 ,  G01N27/4073 ,  G01N27/4075 ,  G01N27/4076 ,  G01N27/4077 ,  G01N27/409

摘要： A gas sensor is provided which has improved responsiveness and is capable of improving accuracy in measurement of an imbalance between cylinders. The gas sensor includes a solid electrolyte having oxygen ion conductivity, a measurement electrode mounted on one principal surface of the solid electrolyte and is exposed to measurement gas, and a reference electrode mounted on the other principal surface of the solid electrolyte and exposed to reference gas A. Interface capacitance between crystal particles constituting the solid electrolyte is not more than 150 μF. Interface resistance between the crystal particles constituting the solid electrolyte and each of the measurement electrode and the reference electrode is not more than 80 Ω. The measurement electrode has a film thickness t1 of 2 to 8 μm.

公开(公告)号：US11899002B2

公开(公告)日：2024-02-13

申请号：US17208060

申请日：2021-03-22

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Takayuki Sekiya

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

CPC分类号： G01N33/0037 ,  G01N27/409 ,  G01N27/4073 ,  G01N27/41 ,  G01N27/419

摘要： A limiting-current type gas sensor including a sensor element including a base part made of an oxygen-ion conductive solid electrolyte and measuring concentration of NOx in a measurement gas includes: a pump cell including a first electrode disposed to be capable of being in contact with a gas introduced into the element and a second electrode disposed so that a part made of the solid electrolyte is located between the first electrode and the second electrode; and a pumping diagnostic part to determine whether an inter-electrode electric field produced in the part made of the solid electrolyte through application of a predetermined pump voltage between the electrodes exceeds a first threshold, and, when the inter-electrode electric field exceeds the first threshold, the predetermined pump voltage is reduced so that the inter-electrode electric field falls below the first threshold.

公开(公告)号：US11852607B2

公开(公告)日：2023-12-26

申请号：US17205633

申请日：2021-03-18

申请人： NGK INSULATORS, LTD.

发明人： Yusuke Watanabe ,  Shotaro Niizuma

IPC分类号： G01N27/04 ,  G01N27/406 ,  G01N27/41 ,  G01N33/00

CPC分类号： G01N27/41 ,  G01N27/4062 ,  G01N33/0037

摘要： A sensor element includes a first pump cell including a first pump electrode and a first reference electrode, a first pump circuit including the first pump cell and a first reference electrode lead, a second pump cell including a second pump electrode and a second reference electrode and a second pump circuit including the second pump cell and a second pump electrode. A resistance value R2 of the second pump circuit is higher than a resistance value R1 of the first pump circuit, and a porosity P2 of the second reference electrode lead is higher than a porosity P1 of the first reference electrode lead.

公开(公告)号：US11782018B2

公开(公告)日：2023-10-10

申请号：US16079119

申请日：2016-12-14

申请人： DENSO CORPORATION

发明人： Masatoshi Ikeda ,  Makoto Ito

IPC分类号： G01N27/41 ,  G01N27/407 ,  G01N27/416 ,  G01N27/409 ,  G01N27/30

CPC分类号： G01N27/41 ,  G01N27/30 ,  G01N27/409 ,  G01N27/4075 ,  G01N27/416

摘要： A gas sensor element includes a solid electrolyte plate, and a measurement electrode and a reference electrode provided on surfaces of the solid electrolyte plate. In a section plane of the reference electrode along a thickness direction, noble metal regions, solid electrolyte regions, mixed regions, and void spaces are present. When a ratio of an area B of the mixed regions in the section plane with respect to an area A of the reference electrode in the section plane is a mixed region ratio B/A, and a ratio of an area C of the void spaces in the section plane with respect to the area A of the reference electrode in the section plane is a void space ratio C/A, a parameter value as a product of the mixed region ratio B/A and the void space ratio C/A falls within a range of 0.001 to 0.01.

公开(公告)号：US20230314366A1

公开(公告)日：2023-10-05

申请号：US18187049

申请日：2023-03-21

申请人： NGK INSULATORS, LTD.

发明人： Yuichiro KONDO ,  Osamu NAKASONE ,  Yusuke WATANABE

IPC分类号： G01N27/41 ,  G01M15/10 ,  G01N27/409 ,  G01N27/27

CPC分类号： G01N27/41 ,  G01M15/102 ,  G01N27/409 ,  G01N27/27

摘要： A sub adjustment pump cell pumps out oxygen from a measurement gas introduced into a sub adjustment chamber to the extent that H2O and CO2 contained in the measurement gas are not decomposed, a first pump cell pumps out oxygen from a first chamber so that substantially all of H2O and CO2 contained in the measurement gas introduced from the sub adjustment chamber into the first chamber are decomposed, concentrations of H2O and CO2 are identified from a pump-in current when H2 and CO generated by decomposition are oxidized in the second chamber and the third chamber, and a concentration of oxygen contained in the measurement gas is identified based on a magnitude of a current flowing between a sub adjustment inner electrode and an outer electrode at the time when the sub adjustment pump cell pumps out oxygen from the sub adjustment chamber.

公开(公告)号：US20190186325A1

公开(公告)日：2019-06-20

申请号：US16152540

申请日：2018-10-05

申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

发明人： Kazuhisa Matsuda ,  Kazuhiro Wakao ,  Keiichiro Aoki

IPC分类号： F01N11/00 ,  G01N27/406 ,  G01N27/41 ,  G01N27/407 ,  G01N27/409

CPC分类号： F01N11/00 ,  F01N2560/025 ,  F01N2560/026 ,  F01N2560/027 ,  G01N27/4065 ,  G01N27/4072 ,  G01N27/409 ,  G01N27/41

摘要： A SOx concentration acquiring apparatus of the invention comprises a sensor cell, a diffusion-limited layer, and an interior space. The sensor cell is formed by a solid electrolyte layer and sensor electrodes provided on opposite surfaces of the solid electrolyte layer, respectively. The interior space is defined by the solid electrolyte layer and the diffusion-limited layer such that an exhaust gas of an internal combustion engine flows into the interior space through the diffusion-limited layer. The apparatus executes a first voltage control for increasing and decreasing a voltage applied to the sensor cell and then, a second voltage control for increasing and decreasing the voltage. The apparatus acquires a current flowing through the sensor cell while the apparatus decreases the voltage in the second voltage control and acquire a SOx concentration of the exhaust gas on the basis of the acquired current.

公开(公告)号：US20180252673A1

公开(公告)日：2018-09-06

申请号：US15448012

申请日：2017-03-02

申请人： DELPHI TECHNOLOGIES IP LIMITED

发明人： Da Yu Wang ,  David M. Racine ,  Sheng Yao

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

CPC分类号： G01N27/41 ,  G01N27/4067 ,  G01N27/4073 ,  G01N27/4075 ,  G01N27/419

摘要： A sensor system includes a common gas chamber and a reference gas chamber that respectively receive an exhaust gas and a reference gas. A Nernst cell is exposed to the common gas chamber and the reference air chamber and provides a reference signal indicative of an oxygen difference between the common gas chamber and the reference gas chamber. An oxygen electrochemical pump cell is exposed to the common gas chamber to provide an oxygen signal indicative of an oxygen-only concentration. A gas electrochemical cell is exposed to the common gas chamber and the reference gas chamber and provides a gas signal indicative of a gas concentration. A processor includes a pulsation module that provides a positive and a negative excitation voltage to the gas electrochemical cell for a duration and that are each followed by a decay curve indicative of the gas concentration.

公开(公告)号：US20180252672A1

公开(公告)日：2018-09-06

申请号：US15447977

申请日：2017-03-02

申请人： DELPHI TECHNOLOGIES IP LIMITED

发明人： Da Yu Wang ,  David M. Racine ,  Sheng Yao

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

CPC分类号： G01N27/41 ,  G01N27/4067 ,  G01N27/4073 ,  G01N27/4074 ,  G01N27/4075 ,  G01N27/417

摘要： A sensor system includes a common gas chamber and a reference gas chamber respectively configured to receive an exhaust gas and a reference gas. A Nernst cell is exposed to the common gas chamber and the reference air chamber. The Nernst cell provides a reference signal indicative of an oxygen difference between the common gas chamber and the reference air chamber. An oxygen electrochemical pump cell is exposed to the common gas chamber and exhaust gas and provides an oxygen signal indicative of an oxygen only concentration. A NOx electrochemical cell is exposed to the common gas chamber and provides a NOx signal indicative of a NOx concentration. A processor is in communication with the Nernst cell, the oxygen-only electrochemical pump cell and NOx electrochemical cells. The processor outputs oxygen and NOx signals and provide a NOx concentration and oxygen concentration of the exhaust.

公开(公告)号：US20180217089A1

公开(公告)日：2018-08-02

申请号：US15886052

申请日：2018-02-01

申请人： DENSO CORPORATION

发明人： Yasutaka KAMIYA ,  Yoshihide SEGAWA ,  Hirokazu YAMADA

IPC分类号： G01N27/407 ,  F01N13/00 ,  G01N33/00 ,  G01M15/10 ,  G01N27/406 ,  G01N27/41

CPC分类号： G01N27/4078 ,  F01N13/008 ,  F01N2560/025 ,  G01M15/104 ,  G01N27/4067 ,  G01N27/4071 ,  G01N27/409 ,  G01N27/41 ,  G01N33/0037 ,  Y02A50/245

摘要： A gas sensor is provided with a sensor element having a detecting portion; an insulator supporting the sensor element in a state where the detecting portion is protruded therefrom, the sensor element being inserted through the insulator; a housing supporting the insulator; an inner cover covering the detecting portion; and an outer cover covering the inner cover.An inner flange portion of the inner cover and an outer flange portion of the outer cover are supported between the insulator and the housing. A protrusion is formed on a corner portion facing the insulator, the protrusion contacting with the insulator. An end face of the outer flange portion is positioned radially closer to an outer side with respect to a radial direction, than a position of an end face of the inner flange portion.