公开(公告)号：US11428663B2

公开(公告)日：2022-08-30

申请号：US16692339

申请日：2019-11-22

Applicant: DENSO CORPORATION

Inventor： Tadakatsu Koyabu ,  Yuki Murayama ,  Ryozo Kayama ,  Akari Hasegawa ,  Yusuke Kawamoto

IPC: G01N27/416 ,  G01N27/407

Abstract: Each of SCUs to includes: a voltage switching unit that performs a first voltage switching to increase an oxygen concentration in a gas chamber and a second voltage switching to decrease the oxygen concentration in the gas chamber after the execution of the first voltage switching; an output change calculation unit that calculates an output change parameter indicating a change in output of the sensor cell according to the voltage switching; a concentration difference calculation unit that calculates a concentration difference parameter indicating a concentration difference in the oxygen concentration or in the concentration of the specific gas in the detection target gas between before the first voltage switching and after the second voltage switching; and a deterioration determination unit that determines a deterioration state of the sensor cell based on the output change parameter and the concentration difference parameter.

公开(公告)号：US12140561B2

公开(公告)日：2024-11-12

申请号：US17389527

申请日：2021-07-30

Applicant: DENSO CORPORATION

Inventor： Tadakatsu Koyabu ,  Yu Murata ,  Yusuke Kawamoto ,  Tomonori Ezaki

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

Abstract: A gas sensor includes a measurement chamber, a reference gas chamber, a first cell, and a second cell. The first cell includes a first electrode in the measurement chamber and a second electrode in the reference gas chamber. The second cell includes a third electrode in the measurement chamber and a fourth electrode in the reference gas chamber. A gas sensor detects a first current that flows between the first electrode and the second electrode, detects a second current that flows between the third electrode and the fourth electrode, calculates a concentration of a specific gas component based on a detected value of the second current, estimates a change amount of oxygen concentration in the reference gas chamber based on a detected value of the first current, and corrects the detected value of the second current based on an estimated value of the change amount of the oxygen concentration.

公开(公告)号：US12181439B2

公开(公告)日：2024-12-31

申请号：US17389966

申请日：2021-07-30

Applicant: DENSO CORPORATION

Inventor： Kazunari Azuma ,  Yusuke Kawamoto

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

Abstract: A gas sensor includes a measurement chamber, a reference gas chamber, a first cell that includes a first electrode in the measurement chamber and a second electrode in the reference gas chamber, and a second cell that includes a third electrode in the measurement chamber and a fourth electrode in the reference gas chamber. The gas sensor detects a first current that flows through the first cell, detects a second current that flows through the second cell, calculates a concentration of a specific gas component based on a detected value of the second current, determines whether a change has occurred in an oxygen concentration in the reference gas chamber based on a detected value of the first current, and corrects the detected value of the second current when the gas sensor determines that a change has occurred in the oxygen concentration in the reference gas chamber.

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.