公开(公告)号：US09845719B2

公开(公告)日：2017-12-19

申请号：US14910781

申请日：2014-07-31

Applicant: DENSO CORPORATION

Inventor： Mikiyasu Matsuoka ,  Yasuo Mukai ,  Shingo Nakata ,  Yuji Yamada

IPC: F01N11/00 ,  G01N27/406 ,  F01N13/00 ,  G01M15/10 ,  G01N33/00 ,  G01N27/409 ,  G01N27/26

CPC classification number: F01N11/007 ,  F01N11/002 ,  F01N13/008 ,  F01N2550/02 ,  G01M15/102 ,  G01N27/26 ,  G01N27/4065 ,  G01N27/409 ,  G01N33/007

Abstract: An O2 sensor has a sensor element, which includes a solid electrolyte layer and a pair of electrodes, while the solid electrolyte layer is interposed between the electrodes. The O2 sensor outputs an electromotive force signal in response to an air-to-fuel ratio of exhaust gas of an engine, which serves as a sensing subject. A constant current circuit, which induces a flow of a predetermined constant electric current between the pair of electrodes of a sensor element, and a current sensing arrangement, which senses a current value of an actual electric current that is conducted through the sensor element, are provided. A microcomputer determines whether an abnormality of the constant current circuit is present based on the current value of the electric current, which is sensed with the current sensing arrangement, in a case where the constant current is induced by the constant current circuit.

公开(公告)号：US09594049B2

公开(公告)日：2017-03-14

申请号：US14455089

申请日：2014-08-08

Applicant: DENSO CORPORATION

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

IPC: G01N27/407 ,  F01N11/00 ,  G01N27/406 ,  F02D41/14 ,  F01N3/10

CPC classification number: G01N27/407 ,  F01N3/101 ,  F01N11/007 ,  F01N2560/025 ,  F01N2560/14 ,  F01N2900/0416 ,  F01N2900/1402 ,  F01N2900/1621 ,  F02D41/1454 ,  F02D41/1495 ,  G01N27/4065 ,  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. A voltage circuit is installed in an electric path, which connects between the exhaust side electrode and a ground, to increase an electric potential of the exhaust side electrode by a predetermined amount relative to an electric potential at an output side of the constant current circuit, from which the electric current flows out of the constant current circuit.

Abstract translation: O2传感器具有传感器元件，其包括固体电解质层和一对电极。 固体电解质层保持在包括大气侧电极和排气侧电极的电极之间。 恒流电路安装在连接在大气侧电极和地之间的电路中，以通过固体电解质层引起电极之间的预定恒定电流的流动。 电压电路安装在连接在排气侧电极和地之间的电路中，相对于恒流电路的输出侧的电位使排气侧电极的电位增加预定量， 电流从恒流电流流出。

公开(公告)号：US10048240B2

公开(公告)日：2018-08-14

申请号：US14849910

申请日：2015-09-10

Applicant: DENSO CORPORATION

Inventor： Satoshi Nishimoto ,  Masafumi Umeno ,  Yuji Yamada

IPC: G01N33/00 ,  G01N27/02 ,  G01N27/04

Abstract: A control apparatus that controls a gas concentration sensor includes a sweep circuit, a current detection resistor, and a calculation portion. The sweep circuit supplies the gas concentration sensor with a sweep current. The calculation portion calculates impedance of the gas concentration sensor. The gas concentration sensor and the current detection resistor are sequentially connected in series along a direction from the sweep circuit to a reference voltage. The sweep circuit has a constant voltage circuit and a reference resistor. An increasing and decreasing tendency of a manufacturing variation of the reference resistor and an increasing and decreasing tendency of a manufacturing variation of the current detection resistor are identical. The calculation portion divides a product of a resistance value of the current detection resistor and a time variation of applied voltage to the gas concentration sensor by a time variation of applied voltage to the current detection resistor.

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.