公开(公告)号：US20160209352A1

公开(公告)日：2016-07-21

申请号：US15023446

申请日：2014-09-25

Applicant: DENSO CORPORATION

Inventor： Takao MISHIMA ,  Shingo NAKATA ,  Mikiyasu MATSUOKA ,  Tomoo KAWASE ,  Yuuji YAMADA

IPC: G01N27/406 ,  G01N27/41 ,  G01N27/407

CPC classification number: G01N27/4065 ,  F02D41/064 ,  F02D41/123 ,  F02D41/1456 ,  F02D41/1494 ,  F02D41/2432 ,  F02D41/2474 ,  G01N27/4067 ,  G01N27/4071 ,  G01N27/41

Abstract: An O2 sensor includes a sensor element using a solid electrolyte layer and a pair of electrodes placed at a position to interpose the solid electrolyte layer, detects an exhaust gas from an internal combustion engine as an object of a detection, and outputs an electromotive force signal depending on an air-fuel ratio of the exhaust gas. The sensor element is connected with a constant current circuit supplying a constant current that is prescribed. A microcomputer calculates an element resistance, determines whether the air-fuel ratio is at least rich, lean, or stoichiometric, on the basis of a comparison between an electromotive force output of the electrogenic cell and a prescribed threshold. Further, the microcomputer controls the constant current supplied by the constant current circuit on the basis of the element resistance.

Abstract translation: O2传感器包括使用固体电解质层的传感器元件和置于固体电解质层的位置的一对电极，检测作为检测对象的来自内燃机的废气，并输出电动势信号 取决于废气的空燃比。 传感器元件与提供规定的恒定电流的恒流电路连接。 微计算机基于电致电池的电动势输出与规定的阈值之间的比较来计算元件电阻，确定空燃比是否至少为浓，稀，或化学计量。 此外，微计算机基于元件电阻来控制由恒流电路提供的恒定电流。

公开(公告)号：US20180340909A1

公开(公告)日：2018-11-29

申请号：US15988329

申请日：2018-05-24

Applicant: DENSO CORPORATION

Inventor： Tadakatsu KOYABU ,  Tomoo KAWASE ,  Yuki MURAYAMA ,  Ryozo KAYAMA ,  Akari HASEGAWA ,  Shoki SHIMIZU

IPC: G01N27/416 ,  G01M15/10 ,  F01N11/00 ,  G01N27/406 ,  G01N27/407 ,  G01N27/41 ,  G01N27/419 ,  G01N27/409 ,  G01N27/417

Abstract: In a gas sensor, a pump cell adjusts a concentration of oxygen in a gas chamber based of a pump cell supply voltage. A sensor cell detects a concentration of a specific gas in a detection target gas after the pump cell has adjusted the concentration of oxygen. In a sensor control unit, a voltage switching part adjusts the pump cell supply voltage to be supplied to the pump cell. A pump cell output control part adjusts a variation range of a pump cell output current of the pump cell before and after a voltage switching process of the pump cell supply voltage to be within a predetermined variation range. A deteriorated state detection part detects a deteriorated state ratio of the sensor cell based on variation of an output current of the sensor cell due to the voltage switching process performed by the voltage switching part.

公开(公告)号：US20210363910A1

公开(公告)日：2021-11-25

申请号：US17392774

申请日：2021-08-03

Applicant: DENSO CORPORATION

Inventor： Mikiyasu MATSUOKA ,  Tomoo KAWASE ,  Toshiyuki ISHII

IPC: F01N11/00 ,  F01N9/00

Abstract: A particulate matter sensor includes a sensor element that includes a measurement member and a heater. An anomaly determiner performs determination that there is a break fault in a signal path of the measurement signal in response to both
(1) A first determiner, which determines whether a first measurement value of the measurement signal is higher than or equal to a predetermined normal determination threshold while the measurement voltage is applied between the measurement electrodes and the temperature of the measurement member is controlled at a first determination temperature, making a negative determination
(2) A second determiner performing negative determination while the measurement voltage is applied between the measurement electrodes and the temperature of the measurement member is controlled within a predetermined temperature range that is higher than the first determination temperature and lower than a second determination temperature, making a negative determination