公开(公告)号：US09664640B2

公开(公告)日：2017-05-30

申请号：US14454769

申请日：2014-08-08

Applicant: DENSO CORPORATION

Inventor： Yuji Yamada ,  Mikiyasu Matsuoka ,  Kenichi Ono ,  Takamasa Oguri ,  Takao Mishima

IPC: G01N27/407 ,  F01N11/00 ,  F01N3/10 ,  F01N13/00

CPC classification number: G01N27/407 ,  F01N3/101 ,  F01N11/00 ,  F01N13/0093 ,  F01N2550/00 ,  F01N2560/025 ,  F01N2570/14 ,  Y02T10/22 ,  Y02T10/47

Abstract: An O2 sensor has a sensor element, which includes a solid electrolyte layer and a pair of electrodes. The solid electrolyte layer is held between the electrodes, which includes an atmosphere side electrode and an exhaust side electrode. A constant current circuit is installed in an electric path, which connects between the atmosphere side electrode and a ground, to induce a flow of a predetermined constant electric current between the electrodes through the solid electrolyte layer. When the sensor element generates an electromotive force, the constant current circuit conducts an electric current, which is generated while using the electromotive force of the sensor element as an electric power source, to induce the flow of the predetermined constant electric current between the electrodes in an electromotive force range, which is equal to or larger than an electromotive force of the sensor element generated at a stoichiometric air-to-fuel ratio.

公开(公告)号：US09816961B2

公开(公告)日：2017-11-14

申请号：US14455051

申请日：2014-08-08

Applicant: DENSO CORPORATION

Inventor： Yuji Yamada ,  Mikiyasu Matsuoka ,  Kenichi Ono ,  Takamasa Oguri ,  Takao Mishima

IPC: G01N27/409 ,  F01N3/10 ,  F01N11/00

CPC classification number: G01N27/409 ,  F01N3/101 ,  F01N11/007 ,  F01N2900/1402 ,  Y02T10/22

Abstract: An O2 sensor has a sensor element, which includes a solid electrolyte layer and a pair of electrodes. The solid electrolyte layer is held between the electrodes. The electrodes include an atmosphere side electrode, which becomes a positive side at a time of outputting an electromotive force from the sensor element, and an exhaust side electrode, which becomes a negative side at the time of outputting the electromotive force from the sensor element. A resistor is provided in an electric path that connects between the atmosphere side electrode and a ground. When the sensor element generates the electromotive force, the resistor conducts an electric current, which is generated while using the electromotive force as an electric power source, to induce a change in an output characteristic of the O2 sensor.