公开(公告)号：US11249043B2

公开(公告)日：2022-02-15

申请号：US15388181

申请日：2016-12-22

Applicant: DENSO CORPORATION

Inventor： Yusuke Kawamoto ,  Toru Katafuchi ,  Takehito Kimata ,  Ryozo Kayama

IPC: G01N27/406 ,  G01N27/416 ,  G01N27/407

Abstract: An SCU as a control device for the gas sensor (first and second NOx sensors) includes an applied voltage switching unit for switching an applied voltage of a pump cell when a deterioration detecting function is performed, and a deterioration rate calculation unit for calculating a deterioration rate of a sensor cell based on a slope during a transient change in an output of the sensor cell according to a switching of the applied voltage by the applied voltage switching unit.

公开(公告)号：US10113992B2

公开(公告)日：2018-10-30

申请号：US15947037

申请日：2018-04-06

Applicant: DENSO CORPORATION

Inventor： Yuusuke Toudou ,  Takehito Kimata ,  Toru Katafuchi

IPC: G01N27/407 ,  G01N27/417 ,  G01N27/419

Abstract: A gas concentration measuring apparatus is provided which works to calculate the concentration of a given gas component with enhanced accuracy. The gas concentration measuring apparatus 1 includes, a gas sensor 10 and a calculating portion 11. The gas sensor 10 is equipped with a pump cell 3, a monitor cell 4, and a sensor cell 5. The calculating portion 11 subtracts a monitor cell current Im that is a current flowing through the monitor cell 4 from a sensor cell current Is that is a current flowing through the sensor cell 5 to calculate the concentration of the given gas component in gas g. When calculating the concentration of the given gas component, the calculating portion 11 performs a correction operation to bring a value of the monitor cell current Im close to a value of an oxygen dependent current Iso that is a component of the sensor cell current Is which arises from the concentration of oxygen.

公开(公告)号：US10557815B2

公开(公告)日：2020-02-11

申请号：US15759947

申请日：2016-09-14

Applicant: DENSO CORPORATION

Inventor： Masahiro Yamamoto ,  Masayuki Tamura ,  Go Miyagawa ,  Toru Katafuchi ,  Takehito Kimata ,  Yuto Tamei

IPC: G01N27/407 ,  G01N27/04 ,  G01N15/10 ,  G01N27/12 ,  G01N15/06 ,  G01M15/10 ,  G01N15/00

Abstract: A sensor element which has a pair of positive and negative detection electrodes disposed on a surface of an insulation body as a detecting portion and a cover body configured to cover an opening of a cylindrical housing. The cover body is provided with gas inlet and outlet holes via which the measuring gas is introduced and discharged. The pair of detection electrodes have a plurality of wire electrodes. The wire electrodes electrically connected to the positive electrode and the wire electrodes electrically connected to the negative electrode are alternately arranged in parallel. Any one of a first insulation layer which is a narrow electrode interval Dn and a second insulation layer which is a wide electrode interval Dw, arranged between adjacent wire electrodes, and the first insulation layer arranged in a center part of the detecting portion.

公开(公告)号：US10073053B2

公开(公告)日：2018-09-11

申请号：US14914370

申请日：2014-08-29

Applicant: DENSO CORPORATION

Inventor： Yuusuke Toudou ,  Takehito Kimata ,  Toru Katafuchi

IPC: G01N27/417 ,  G01N27/419 ,  G01N27/407

CPC classification number: G01N27/4175 ,  G01N27/407 ,  G01N27/419

Abstract: A gas concentration measuring apparatus is provided which works to calculate the concentration of a given gas component with enhanced accuracy. The gas concentration measuring apparatus 1 includes, a gas sensor 10 and a calculating portion 11. The gas sensor 10 is equipped with a pump cell 3, a monitor cell 4, and a sensor cell 5. The calculating portion 11 subtracts a monitor cell current Im that is a current flowing through the monitor cell 4 from a sensor cell current Is that is a current flowing through the sensor cell 5 to calculate the concentration of the given gas component in gas g. When calculating the concentration of the given gas component, the calculating portion 11 performs a correction operation to bring a value of the monitor cell current Im close to a value of an oxygen dependent current Iso that is a component of the sensor cell current Is which arises from the concentration of oxygen.