公开(公告)号：US10569207B2

公开(公告)日：2020-02-25

申请号：US15542215

申请日：2016-01-05

Applicant: DENSO CORPORATION

Inventor： Hironori Niwa ,  Syusaku Yamamura ,  Mikio Ishihara ,  Takao Mishima ,  Shingo Nakata ,  Hiroaki Fujii ,  Kouta Yamakoshi ,  Akira Miyashita

IPC: B01D46/24 ,  F01N3/022 ,  B01D39/20

Abstract: An exhaust gas filter purifies exhaust gas containing particulate matter emitted from an engine. The filter has cell walls and cells surrounded by the cell walls. Through pores formed in the cell walls, adjacent cells are communicated. The cells have open cells opening along an axial direction of the filter, and plugged cells. An upstream end part of the plugged cell is plugged by a plug member. On a cross section perpendicular to the axial direction, a flow-passage sectional area of the plugged cells is larger than a flow-passage sectional area of the open cells. A total length of the filter is not less than a first standard value and is not more than a critical length Lm determined by respective predetermined equations.

公开(公告)号：US10302588B2

公开(公告)日：2019-05-28

申请号：US15417304

申请日：2017-01-27

Applicant: DENSO CORPORATION

Inventor： Mikiyasu Matsuoka ,  Shingo Nakata ,  Takao Mishima

IPC: G01N27/407 ,  G01N27/406 ,  F02D41/14 ,  F02D41/02 ,  F01N13/00 ,  F01N3/10

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：US10234418B2

公开(公告)日：2019-03-19

申请号：US15023435

申请日：2014-09-25

Applicant: DENSO CORPORATION

Inventor： Shingo Nakata ,  Mikiyasu Matsuoka ,  Yasuo Mukai

IPC: G01N27/417 ,  G01N27/416 ,  G01N27/407 ,  G01N33/00 ,  G01N27/406 ,  G01N27/409 ,  F02D41/12 ,  F02D41/14

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 conducts an abnormality diagnosis of an output response of the sensor element on the basis of a state of variation in an electromotive force output. Further, when the microcomputer conducts the abnormality diagnosis, the microcomputer restricts a supply of the constant current by the constant current circuit before conducting the abnormality diagnosis.

公开(公告)号：US10072542B2

公开(公告)日：2018-09-11

申请号：US15519943

申请日：2016-01-07

Applicant: DENSO CORPORATION

Inventor： Hiroaki Fujii ,  Shingo Nakata

IPC: F01N3/00 ,  F01N3/022 ,  F01N3/035 ,  F01N3/023 ,  F02M35/02 ,  F01N3/20

CPC classification number: F01N3/022 ,  F01N3/023 ,  F01N3/035 ,  F01N3/204 ,  F02D41/1466 ,  F02D41/22 ,  F02D41/222 ,  F02D2200/0812 ,  F02M35/02 ,  Y02T10/40

Abstract: An abnormality diagnosis device includes a partially-plugged filter, a pressure difference sensor, a PM sensor, a first estimation portion estimating a diagnosis amount of PM from the partially-plugged filter, according to a running condition of the internal combustion engine, a second estimation portion estimating the diagnosis amount of PM according to an output of the pressure difference sensor, a third estimation portion estimating the diagnosis amount of PM according to an output of the PM sensor, and an abnormality diagnosis portion distinctly determining an abnormality of the internal combustion engine, an abnormality of the partially-plugged filter, and an abnormality of the PM sensor by comparing the diagnosis amount of PM estimated by the first estimation portion, the diagnosis amount of PM estimated by the second estimation portion, and the diagnosis amount of PM estimated by the third estimation portion.

公开(公告)号：US08893473B2

公开(公告)日：2014-11-25

申请号：US13768634

申请日：2013-02-15

Applicant: Denso Corporation

Inventor： Shingo Nakata ,  Mikiyasu Matsuoka ,  Hiroki Nogami

IPC: F01N3/00 ,  F02D41/14 ,  F01N9/00

CPC classification number: F01N9/00 ,  F02D41/1441 ,  F02D41/1456 ,  F02D41/1476

Abstract: An emission control system for an engine includes an upstream sensor provided upstream of a catalyst in a flow direction of exhaust gas, a downstream sensor provided downstream of the catalyst to detect an air-fuel ratio so that the air-fuel ratio approaches a target air-fuel ratio in a sub feedback control, a constant current supply portion which changes an output characteristic of the downstream sensor by applying a constant current on a pair of electrodes thereof. A characteristic control portion controls the constant current supply portion in the sub feedback control to advance a timing of lean detection of the downstream sensor when the air-fuel ratio is richer than the target air-fuel ratio, and to advance a timing of rich detection of the downstream sensor when the air-fuel ratio is leaner than the target air-fuel ratio.

Abstract translation: 用于发动机的排放控制系统包括设置在排气流动方向上的催化剂上游的上游传感器，设置在催化剂下游的下游传感器，以检测空燃比使空燃比接近目标空气 - 反馈控制中的燃料比，恒定电流供应部分，其通过在其一对电极上施加恒定电流来改变下游传感器的输出特性。 当空燃比比目标空燃比更浓时，特征控制部分控制副反馈控制中的恒流供应部分，以提高下游传感器的稀薄检测时间，并且提前进行丰富检测的定时 当空燃比比目标空燃比更稀的时候，

公开(公告)号：US10392996B2

公开(公告)日：2019-08-27

申请号：US15547872

申请日：2016-01-21

Applicant: DENSO CORPORATION

Inventor： Shingo Nakata

IPC: F01N9/00 ,  F01N3/027 ,  F01N3/10 ,  F01N11/00 ,  F02D41/14 ,  F02D41/02 ,  F02D41/22

Abstract: A particulate detection device has an insulation part, electrodes, an adhesion amount calculation section, a heater and a controller. The insulation part is located in an exhaust passage of an internal combustion engine and has an adhesion surface to which exhaust particulates emitted from the internal combustion engine adhere. The adhesion amount calculation section calculates an adhesion amount of the exhaust particulates adhered to the insulation part based on an electrical resistance between two of the electrodes. The controller, in a normal control, controls an air/fuel ratio in the internal combustion engine to be a theoretical air/fuel ratio. The controller, in a regeneration control, controls the heater to increase a temperature of the insulation part and removes the exhaust particulates from the insulation part by burning the exhaust particulates, and controls the air/fuel ratio to be lean as compared to the theoretical air/fuel ratio.

公开(公告)号：US10247694B2

公开(公告)日：2019-04-02

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: G01N27/407 ,  G01N27/406 ,  F02D41/14 ,  F02D41/24 ,  G01N27/41 ,  F02D41/06 ,  F02D41/12

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.

公开(公告)号：US10180111B2

公开(公告)日：2019-01-15

申请号：US15023441

申请日：2014-09-25

Applicant: DENSO CORPORATION

Inventor： Takao Mishima ,  Mikiyasu Matsuoka ,  Shingo Nakata

IPC: G01N27/407 ,  F02D41/14 ,  G01N27/409 ,  F01N13/00 ,  G01N27/406 ,  G01N27/416 ,  G01N27/417 ,  F02D41/06 ,  F02D41/12

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.

公开(公告)号：US09890725B2

公开(公告)日：2018-02-13

申请号：US14896110

申请日：2014-05-16

Applicant: DENSO CORPORATION

Inventor： Mikiyasu Matsuoka ,  Shingo Nakata

IPC: G01N37/00 ,  F02D41/12 ,  F02D41/14 ,  F02D41/22 ,  G01N27/406 ,  G01M15/10 ,  G01N33/00

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).

公开(公告)号：US08899014B2

公开(公告)日：2014-12-02

申请号：US13752728

申请日：2013-01-29

Applicant: Denso Corporation

Inventor： Kosuke Nakano ,  Shingo Nakata ,  Mikiyasu Matsuoka

IPC: F01N3/00 ,  F01N3/10 ,  G01N7/00 ,  G01N33/497 ,  F02M63/02 ,  G01N27/26 ,  F01N11/00 ,  F02D41/14

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。 发光控制系统还包括：恒流供给部，其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;丰富方向控制部，其在加油停止控制之后执行丰富方向控制;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。