公开(公告)号：US20190391108A1

公开(公告)日：2019-12-26

申请号：US16448092

申请日：2019-06-21

Applicant: DENSO CORPORATION

Inventor： Hao WU ,  Shota HAGINO ,  Hiroki ICHIKAWA

IPC: G01N27/406 ,  G01N27/49 ,  G01N27/407

Abstract: A nitrous oxide concentration detector includes a control unit. In the control unit, a first control section controls a voltage application section and a heater to achieve a first state in which nitric oxide undergoes electrolysis and nitrous oxide does not undergo electrolysis. A second control section controls the voltage application section and the heater to achieve a second state in which nitric oxide and nitrous oxide undergo electrolysis. An estimation section estimates an estimated current that flows between a first electrode and a second electrode due to electrolysis of nitric oxide in the second state based on a first current detected by a current detector in the first state. A calculation section calculates a nitrous oxide concentration based on a third current obtained by subtracting the estimated current estimated by the estimation section from a second current detected by the current detector in the second state.

公开(公告)号：US20190391109A1

公开(公告)日：2019-12-26

申请号：US16451285

申请日：2019-06-25

Applicant: DENSO CORPORATION

Inventor： Shota HAGINO ,  Masatoshi IKEDA ,  Makoto ITO ,  Zhenzhou SU ,  Hao WU ,  Takashi HIRAYAMA ,  Daisuke KAWAI ,  Satoshi NAKAMURA

IPC: G01N27/407 ,  G01N27/409

Abstract: A gas sensor is equipped with a sensor device made of a stack of a solid electrolyte body, a sensor electrode, a reference electrode, a first insulator, a second insulator, a gas chamber, a reference gas duct, a heater, and a heat transfer member. The heater has a heating element at least partially overlapping the sensor electrode and the reference electrode. The heat transfer member is made of a dense metallic oxide material which blocks passage of measurement gas therethrough. The heat transfer member is held between the sensor electrode and the first insulator in which the heater is embedded within the gas chamber and works to facilitate transfer of thermal energy, as generated by the heater, to the solid electrolyte body, the sensor electrode, and the reference electrode. This results in enhanced thermal conductivity of the sensor device and achieves quick activation of the sensor device.