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。