公开(公告)号：US20170138890A1

公开(公告)日：2017-05-18

申请号：US15417304

申请日：2017-01-27

Applicant: DENSO CORPORATION

Inventor： Mikiyasu MATSUOKA ,  Shingo NAKATA ,  Takao MISHIMA

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

CPC classification number: G01N27/407 ,  F01N3/101 ,  F01N13/008 ,  F01N2560/02 ,  F01N2900/1621 ,  F02D41/0235 ,  F02D41/1441 ,  F02D41/1454 ,  F02D41/1456 ,  F02D41/1476 ,  F02D41/1495 ,  F02D2250/36

Abstract: A catalytic conversion characteristic of a catalyst, which indicates a relationship between an air-to-fuel ratio and a catalytic conversion efficiency of the catalyst, includes a second air-to-fuel ratio point, which is a point of starting an outflow of NOx from the catalyst and is located on a rich side of a first air-to-fuel ratio point that forms an equilibrium point for a rich component and oxygen. A constant current circuit, which induces a flow of an electric current from an exhaust side electrode to an atmosphere side electrode through a solid electrolyte layer in a sensor element, is connected to the sensor element. A microcomputer controls a current value of the electric current, which is induced by the constant current circuit, based on a difference between the first air-to-fuel ratio point and the second air-to-fuel ratio point at the catalyst.

公开(公告)号：US20160230686A1

公开(公告)日：2016-08-11

申请号：US15023441

申请日：2014-09-25

Applicant: DENSO CORPORATION

Inventor： Takao MISHIMA ,  Mikiyasu MATSUOKA ,  Shingo NAKATA

IPC: F02D41/14 ,  F01N13/00 ,  G01N27/406 ,  G01N27/409 ,  G01N27/416 ,  G01N27/417

CPC classification number: F02D41/1455 ,  F01N13/008 ,  F02D41/064 ,  F02D41/123 ,  F02D41/1454 ,  F02D41/1494 ,  G01N27/4065 ,  G01N27/407 ,  G01N27/409 ,  G01N27/4161 ,  G01N27/4175

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 a resistance value (element resistance) of the sensor element, and performs a restriction on 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。 微计算机计算传感器元件的电阻值（元件电阻），并根据元件电阻对恒流电路提供的恒定电流进行限制。

公开(公告)号：US20160123262A1

公开(公告)日：2016-05-05

申请号：US14896110

申请日：2014-05-16

Applicant: DENSO CORPORATION

Inventor： Mikiyasu MATSUOKA ,  Shingo NAKATA

IPC: F02D41/12 ,  G01N33/00 ,  G01M15/10 ,  F02D41/14

CPC classification number: F02D41/123 ,  F02D41/1456 ,  F02D41/1495 ,  F02D41/1496 ,  F02D41/222 ,  G01M15/104 ,  G01N27/4065 ,  G01N33/007

Abstract: A constant current circuit is controlled to stop a constant current Ics (Ics=0) flowing between sensor electrodes of an oxygen sensor, in a period before the oxygen sensor becomes active, during a fuel cut of an engine, and after the engine stops. When an abnormality (for example, a failure) occurs in the constant current circuit, a sensor output equivalent to an output of the oxygen sensor of when the constant current circuit is controlled to stop the constant current Ics is different from a normal sensor output. An abnormality diagnosis is executed to determine a presence or absence of the abnormality in the constant current circuit depending on whether the output of the oxygen sensor is out of a predetermined normal range, in a period before the oxygen sensor becomes active, during a fuel cut of an engine, and after the engine stops (when the constant current circuit is controlled to stop the constant current Ics).

Abstract translation: 控制恒流电路以在发动机的燃料切断期间和发动机停止之后，在氧传感器变为活动之前的时段期间停止在氧传感器的传感器电极之间流动的恒定电流Ics（Ics = 0）。 当在恒流电路中出现异常（例如故障）时，与恒定电流电路被控制以停止恒定电流Ics时相当于氧传感器的输出的传感器输出与正常的传感器输出不同。 执行异常诊断以根据氧传感器的输出在氧传感器变为活动之前的时段期间在氧气传感器的输出是否在预定的正常范围内，在燃料切断期间确定恒流电路中是否存在异常 发动机停止后（当恒流电路被控制以停止恒定电流Ics时）。

公开(公告)号：US20130192210A1

公开(公告)日：2013-08-01

申请号：US13752728

申请日：2013-01-29

Applicant: DENSO CORPORATION

Inventor： Kosuke NAKANO ,  Shingo NAKATA ,  Mikiyasu MATSUOKA

IPC: F01N11/00

CPC classification number: F01N11/00 ,  F02D41/1439 ,  F02D41/1455 ,  F02D41/1456 ,  F02D41/1475

Abstract: An emission control system for an engine includes a catalyst and an exhaust-gas sensor provided downstream of the catalyst in a flow direction of exhaust gas. The exhaust-gas sensor includes a sensor element that includes a pair of electrodes and a solid electrolyte body located between the electrodes. The emission control system further includes a constant current supply portion that changes an output characteristic of the exhaust-gas sensor by applying a constant current between the electrodes, a rich direction control portion that performs a rich direction control after a fuelling-stop control, and a characteristic control portion that performs a rich responsiveness control during the rich direction control. In the rich direction control, an air-fuel ratio of the exhaust gas is made to be richer. In the rich responsiveness control, the constant current supply portion increases a detection responsiveness of the exhaust-gas sensor with respect to rich gas.

Abstract translation: 发动机的排放控制系统包括催化剂和排气传感器，其设置在排气的流动方向上的催化剂下游。 排气传感器包括传感器元件，其包括一对电极和位于电极之间的固体电解质体。 排放控制系统还包括通过在电极之间施加恒定电流来改变排气传感器的输出特性的恒定电流供给部，在加油停止控制之后执行丰富方向控制的丰富方向控制部，以及 特征控制部分，在丰富方向控制期间执行丰富的响应性控制。 在丰富的方向控制下，使排气的空燃比更加丰富。 在丰富的响应性控制中，恒流供应部分增加废气传感器相对于富气的检测响应性。