公开(公告)号：US11300532B2

公开(公告)日：2022-04-12

申请号：US16682078

申请日：2019-11-13

Applicant: DENSO CORPORATION

Inventor： Kota Yamakoshi ,  Shingo Nakata ,  Shusaku Yamamura

IPC: G01M15/10 ,  G01N27/04 ,  F01N13/00

Abstract: A particulate matter detection system detects a particulate matter in exhaust gas. The particulate matter detection system includes: a particulate matter detection sensor in which at least one detection portion is provided, the at least one detection portion including at least one pair of multiple electrodes and a deposition surface which is interposed between the pair of electrodes and which the particulate matter is deposited on; a capacitor connected to the at least one detection portion in series; a power supply configured to apply a direct voltage to a series body including the at least one detection portion and the capacitor; and a voltage measurement portion configured to measure a voltage of the capacitor.

公开(公告)号：US09981224B2

公开(公告)日：2018-05-29

申请号：US15553699

申请日：2016-02-12

Applicant: DENSO CORPORATION

Inventor： Shingo Nakata ,  Takao Mishima

IPC: F01N3/023 ,  B01D53/94 ,  B01D46/24 ,  B01J35/04 ,  F01N3/10 ,  F01N3/022

CPC classification number: B01D53/9454 ,  B01D39/20 ,  B01D46/2418 ,  B01D53/94 ,  B01D2279/30 ,  B01J35/04 ,  B01J37/0217 ,  F01N3/022 ,  F01N3/0222 ,  F01N3/023 ,  F01N3/035 ,  F01N3/101 ,  F01N3/24 ,  F01N3/28 ,  F01N2330/30 ,  F02D41/029 ,  F02D41/1446 ,  Y02T10/22

Abstract: An exhaust purification device purifies an exhaust gas exhausted from an internal combustion engine. The exhaust purification device has a three-way catalytic agent that is located in an exhaust passage of the internal combustion engine and a particulate filter that is located downstream of the three-way catalytic agent in the exhaust passage and that collects an exhaust particulate. The particulate filter is provided with cells that includes sealed-inlet cells of which upstream ends are sealed and through cells through which an upstream side and a downstream side of the particulate filter communicate with each other. The particulate filter is arranged at a location where a temperature of the exhaust gas reaching an upstream end of the particulate filter is higher than or equal to a combustion temperature of the exhaust particulate, when the three-way catalytic agent is in an active state and when the internal combustion engine is operated.

公开(公告)号：US09964513B2

公开(公告)日：2018-05-08

申请号：US14454792

申请日：2014-08-08

Applicant: DENSO CORPORATION

Inventor： Mikiyasu Matsuoka ,  Shingo Nakata ,  Takao Mishima

IPC: G01N27/26 ,  G01N27/407 ,  F02D41/14 ,  F02D41/02

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：US20150025778A1

公开(公告)日：2015-01-22

申请号：US14376243

申请日：2013-01-22

Applicant: DENSO CORPORATION

Inventor： Mikiyasu Matsuoka ,  Shingo Nakata

IPC: F02D41/30

CPC classification number: F02D41/30 ,  F02D41/1441 ,  F02D41/1454 ,  F02D2041/1431 ,  G01N27/4065

Abstract: A constant current is made to flow between sensor electrodes by a constant current circuit provided in the outside of the oxygen sensor, whereby the output characteristics of an oxygen sensor can be changed. Further, when a specified current-switching-permission condition is met, a value of current flowing between the sensor electrodes is switched and a direct current resistance value (internal resistance value) of the oxygen sensor is computed from a difference in the output of the oxygen sensor and a difference in the value of the current between before and after switching the value of the current flowing between the sensor electrodes. Then, at the time of a constant current supply in which the constant current is made to flow between the sensor electrodes, in other words, when the output characteristics of the oxygen sensor are changed, an amount of output-voltage-variation is found from a constant current value and a direct resistance value at that time. Then, the output of the oxygen sensor is corrected by the use of the amount of output-voltage-variation. In this way, an air-fuel ratio control based on the output of the oxygen sensor can be performed with high accuracy.

Abstract translation: 通过设置在氧传感器外部的恒流电路使恒定电流在传感器电极之间流动，从而可以改变氧传感器的输出特性。 此外，当满足指定的电流切换允许条件时，切换在传感器电极之间流动的电流值，并根据输出的差异计算氧传感器的直流电阻值（内部电阻值） 氧传感器和切换传感器电极之间的电流值之前和之后的电流值的差异。 然后，在使恒定电流在传感器电极之间流动的恒定电流供给时，换句话说，当氧传感器的输出特性发生变化时，发现输出电压变化量从 此时的恒定电流值和直流电阻值。 然后，通过使用输出电压变化量校正氧传感器的输出。 以这种方式，可以高精度地执行基于氧传感器的输出的空燃比控制。

公开(公告)号：US10287957B2

公开(公告)日：2019-05-14

申请号：US15552367

申请日：2016-03-23

Applicant: DENSO CORPORATION

Inventor： Shingo Nakata

IPC: F01N9/00 ,  F01N3/023 ,  F01N11/00 ,  F01N3/035

Abstract: An exhaust gas purification device includes: an actual pressure difference obtainer that acquires an actual pressure difference which is an actual measurement value of a pressure difference of a filter; a flow rate obtainer that acquires a flow rate of exhaust gas flowing into the filter; a calculation pressure difference calculator that calculates a calculation pressure difference which is a calculated value of the pressure difference of the filter in a normal state when the exhaust gas flows into the filter with the flow rate acquired by the flow rate obtainer; and an abnormality determiner that performs an abnormality determination of the filter based on a pressure difference variation ratio which is a ratio between a variation in the actual pressure difference and a variation in the calculation pressure difference in response to a variation in the flow rate of the exhaust gas.

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：US09052280B2

公开(公告)日：2015-06-09

申请号：US13761542

申请日：2013-02-07

Applicant: DENSO CORPORATION

Inventor： Hiroshi Katsurahara ,  Shingo Nakata ,  Mikiyasu Matsuoka

IPC: G01N27/407

CPC classification number: G01N27/407 ,  F01N11/007 ,  F01N2550/02 ,  F01N2560/025 ,  F01N2900/1402 ,  F02D41/0235 ,  F02D41/123 ,  F02D41/1441 ,  F02D41/1454 ,  F02D41/1474 ,  F02D41/1495 ,  Y02T10/47

Abstract: A deterioration diagnosis device, which performs a deterioration diagnosis of a catalyst, includes an exhaust-gas sensor provided downstream of the catalyst in a flow direction of exhaust gas such that an output value of the exhaust-gas sensor is used at least in the deterioration diagnosis. The deterioration diagnosis device further includes the constant current supply portion which applies a voltage to a sensor element of the exhaust-gas sensor to change an output characteristic of the exhaust-gas sensor, a response-time detection portion which detects a response time required for the output value of the exhaust-gas sensor to change from a rich threshold to a lean threshold, a response-time correction portion which controls the constant current supply portion to change the output characteristic of the exhaust-gas sensor so as to shorten the response time when the response time is longer than a predetermined reference time.

Abstract translation: 执行催化剂劣化诊断的劣化诊断装置包括排气传感器，其设置在排气的流动方向上的催化剂下游，使得废气传感器的输出值至少使用在劣化中 诊断。 劣化诊断装置还包括对排气传感器的传感器元件施加电压以改变排气传感器的输出特性的恒流供给部，响应时间检测部，其检测所需的响应时间 排气传感器的输出值从丰富阈值变化到稀薄阈值;响应时间校正部，其控制恒流供给部，改变排气传感器的输出特性，以缩短响应 当响应时间长于预定的参考时间时。

公开(公告)号：US20140373512A1

公开(公告)日：2014-12-25

申请号：US14376179

申请日：2013-01-22

Applicant: DENSO CORPORATION

Inventor： Masahiro Yokoi ,  Mikiyasu Matsuoka ,  Shingo Nakata

IPC: F01N11/00 ,  F01N3/20

CPC classification number: F01N11/007 ,  B01D53/30 ,  B01D53/94 ,  B01D53/9422 ,  B01D53/9431 ,  B01D53/9445 ,  B01D53/9477 ,  F01N3/00 ,  F01N3/08 ,  F01N3/0842 ,  F01N3/101 ,  F01N3/20 ,  F01N3/24 ,  F01N13/009 ,  F01N2560/025 ,  F02D41/0235 ,  F02D41/0275 ,  F02D41/1439 ,  F02D41/1454 ,  F02D41/1476 ,  G01N27/4065 ,  G01N27/409 ,  Y02T10/22

Abstract: In a system having an oxygen sensor arranged downstream of a NOx storage-reduction catalyst, a constant current is made to flow between sensor electrodes by a constant current circuit provided in the outside of the oxygen sensor, which makes it possible to change an output characteristic of the oxygen sensor. Further, during a lean combustion control of an engine, a sensing responsiveness to a lean component of the oxygen sensor is improved. In this way, when NOx (lean component) is emitted to the downstream of the catalyst, the NOx can be quickly sensed by the oxygen sensor. Meanwhile, during a rich combustion control of the engine, the sensing responsiveness to a rich component of the oxygen sensor is improved. In this way, when HC and CO (rich components) are emitted to the downstream of the catalyst, the HC and the CO can be quickly sensed by the oxygen sensor.

Abstract translation: 在具有设置在NOx储存还原催化剂下游的氧传感器的系统中，通过设置在氧传感器外部的恒流电路使恒定电流在传感器电极之间流动，这使得可以改变输出特性 的氧传感器。 此外，在发动机的稀燃控制期间，提高了对氧传感器的稀薄成分的感测响应性。 以这种方式，当向催化剂的下游排放NO x（贫组分）时，可通过氧传感器快速地感测NOx。 同时，在发动机的丰富的燃烧控制中，提高了对氧传感器的丰富部件的感测响应性。 以这种方式，当HC和CO（富成分）被排放到催化剂的下游时，可以通过氧传感器快速地感测HC和CO。

公开(公告)号：US08756914B2

公开(公告)日：2014-06-24

申请号：US13752791

申请日：2013-01-29

Applicant: Denso Corporation

Inventor： Kosuke Nakano ,  Shingo Nakata ,  Mikiyasu Matsuoka

IPC: F01N3/00

CPC classification number: F01N9/005 ,  F02D41/1441 ,  F02D41/1454 ,  F02D2041/1431

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 catalytic-state determination portion which determines a rich/lean state of the catalyst, a rich direction control portion which performs and terminates a rich direction control depending on the rich/lean state of the catalyst, a lean direction control portion which performs a lean direction control after the rich direction control, and a characteristic control portion which performs a lean responsiveness control at least during the lean direction control.

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，确定催化剂的富/贫状态的催化态判定部，富 方向控制部分，其根据催化剂的浓/贫状态执行和终止丰富方向控制;在丰富方向控制之后进行瘦方向控制的瘦方向控制部分，以及执行精益响应控制的特性控制部分 至少在倾向控制期间。