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公开(公告)号：US20180313739A1
公开(公告)日：2018-11-01
申请号：US15769797
申请日：2016-10-20
Applicant: DENSO CORPORATION
Inventor： Go MIYAGAWA , Masayuki TAMURA , Masahiro YAMAMOTO , Takashi ARAKI , Toshihiro SAKAWA , Masato KATSUNO , Manabu YOSHIDOME
Abstract: An apparatus which detects particulate matter is provided. This apparatus estimates a volume of water inside an exhaust passage using estimation sections. When an estimated volume of water is larger than a water drainage threshold, an element portion is heated using a heater by the first temperature range controller, in a temperature range which resists water-induced cracking independent of a volume of water droplets. If the estimated volume of water is less than a water drainage threshold, the water drainage determination section determines that the water drainage of the exhaust passage is completed. Additionally, if it is estimated that the water drainage is completed, the element portion is heated by a second temperature controller at temperature lower than a starting temperature of combustion of particulate matter and in order to repel water adhered onto the element portion in a water-repellent temperature range for a predetermined period.
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公开(公告)号：US20190293541A1
公开(公告)日：2019-09-26
申请号：US16439983
申请日：2019-06-13
Applicant: DENSO CORPORATION
Inventor： Kazuhiko KOIKE , Go MIYAGAWA
Abstract: A particulate matter detection apparatus includes a sensor unit and a sensor control unit. The sensor unit outputs a single based on an amount of particulate matter. The sensor control unit detects a particle count of the particulate matter. The sensor control unit applies a first voltage to a pair of electrodes and electrostatically collects the particulate matter. After changing the applied voltage to a second voltage that differs from the first voltage in a state in which the sensor output at the first voltage has reached a threshold, the sensor control unit detects a resistance value between the pair of electrodes, and calculates the particle count using an average particle diameter of the particulate matter that is estimated from the resistance value and a mass of the particulate matter that is estimated from the sensor output.
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公开(公告)号：US20180195933A1
公开(公告)日：2018-07-12
申请号：US15740507
申请日：2016-06-08
Applicant: DENSO CORPORATION
Inventor： Go MIYAGAWA , Kouji ANDOH , Masayuki TAMURA , Hirokatsu IMAGAWA , Takao MISHIMA , Hideki YAMADA , Masahiro YAMAMOTO
CPC classification number: G01M15/102 , F01N11/002 , G01M15/10 , G01N15/0606 , G01N15/0656 , G01N27/04 , G01N2015/0046
Abstract: A particulate matter sensor and a particulate matter sensing system using such a sensor are provided which are capable of being produced at decreased cost and accurately measuring the temperature of a heater. The particulate matter sensor includes a deposition portion on which particulate matter contained in exhaust gas is accumulated, a pair of electrodes which are disposed on the deposition portion and separate from each other, a heater which heats the deposition portion, and a pair of heater leads which form a path through which electrical current is delivered to the heater. A sensing line is connected to at least one of the heater leads to measure a resistance of the heater lead.
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公开(公告)号：US20170322134A1
公开(公告)日：2017-11-09
申请号：US15524738
申请日：2015-09-08
Applicant: DENSO CORPORATION
Inventor： Kazuhiko KOIKE , Hironobu SHIMOKAWA , Masayuki TAMURA , Go MIYAGAWA , Tomotaka MOURI
CPC classification number: G01N15/06 , G01B7/34 , G01M15/102 , G01N15/0606 , G01N15/0656 , G01N27/04 , G01N2015/0046
Abstract: A particulate matter detection element 1 includes paired detection electrodes 12 for detecting particulate matter contained in exhaust gas discharged from an internal combustion engine, and insulating member 13 made of electrically insulating material. In the particulate matter detection element 1, at least part of the paired detection electrodes 12 is exposed from the insulating member 13 in the direction perpendicular to the lamination direction of the paired detection electrodes 1, to cause part of the particulate matter to deposit thereon. The surface roughness of at least the insulating member disposed between the paired detection electrodes is between 0.8 μm and 8.0 μm in 10-point average roughness.
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公开(公告)号：US20180306087A1
公开(公告)日：2018-10-25
申请号：US15769801
申请日：2016-10-21
Applicant: DENSO CORPORATION
Inventor： Takashi ARAKI , Masayuki TAMURA , Masahiro YAMAMOTO , Go MIYAGAWA , Toshihiro SAKAWA , Masato KATSUNO , Manabu YOSHIDOME
CPC classification number: F01N11/00 , F01N3/00 , F01N3/023 , F01N3/18 , F01N9/002 , F01N2550/04 , F01N2900/14 , F01N2900/1602 , F01N2900/1606
Abstract: A particulate matter detection apparatus is provided with an element portion onto which PM contained in exhaust gas of an engine adheres thereto. A heater which heats the element portion, a quantity detecting portion which detects a quantity of the PM based on electrical properties of the element portion and a temperature detecting portion which detects a temperature of the element portion. The apparatus is further provided with a first and second temperature controller. The first temperature controller heats the element portion using a heater in a first period, which excludes a period in which PM adheres to the element portion based on a detected temperature of the element portion. The element portion is heated in a first temperature range to combust soluble organic fractions contained in the PM and resist melting of ash components contained in the PM. The first period excludes a period in which PM adheres to the element portion. The second temperature controller heats the element portion in the second temperature range, which is higher than the first temperature range using the heater, such that ash is combusted, based on a detected temperature of the element portion.
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Patent Agency Ranking
公开(公告)号：US20180266936A1
公开(公告)日：2018-09-20
申请号：US15759947
申请日：2016-09-14
Applicant: DENSO CORPORATION
Inventor： Masahiro YAMAMOTO , Masayuki TAMURA , Go MIYAGAWA , Toru KATAFUCHI , Takehito KIMATA , Yuto TAMEI
CPC classification number: G01N15/1031 , G01N15/0606 , G01N15/0656 , G01N27/045 , G01N2015/0046
Abstract: A sensor element which has a pair of positive and negative detection electrodes disposed on a surface of an insulation body as a detecting portion and a cover body configured to cover an opening of a cylindrical housing. The cover body is provided with gas inlet and outlet holes via which the measuring gas is introduced and discharged. The pair of detection electrodes have a plurality of wire electrodes. The wire electrodes electrically connected to the positive electrode and the wire electrodes electrically connected to the negative electrode are alternately arranged in parallel. Any one of a first insulation layer which is a narrow electrode interval Dn and a second insulation layer which is a wide electrode interval Dw, arranged between adjacent wire electrodes, and the first insulation layer arranged in a center part of the detecting portion.
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公开(公告)号：US20180187623A1
公开(公告)日：2018-07-05
申请号：US15740919
申请日：2016-06-30
Applicant: DENSO CORPORATION
Inventor： Masahiro YAMAMOTO , Manabu YOSHIDOME , Masayuki TAMURA , Go MIYAGAWA
Abstract: A filter malfunction determination apparatus includes a calculator that calculates, upon determination that a rapid output increase has occurred, an amount of change of a parameter value output from a sensor before and after the rapid output increase. The calculator calculates, based on the calculated amount of change, a correction value for correcting at least one of the parameter value output from the sensor and a malfunction determination threshold. The filter malfunction determination apparatus includes an offset corrector configured to perform, based on the correction value, offset correction of at least one of the parameter value output from the sensor and the malfunction determination threshold after determination that the rapid output increase has occurred.
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公开(公告)号：US20230176005A1
公开(公告)日：2023-06-08
申请号：US18161449
申请日：2023-01-30
Applicant: DENSO CORPORATION
Inventor： Go MIYAGAWA , Kazuki YAGI , Kei SUGIURA
IPC: G01N27/406 , G01N27/409 , G01N27/419
CPC classification number: G01N27/4067 , G01N27/409 , G01N27/419 , G01N27/41
Abstract: The sensor control unit is used for a gas sensor disposed in an exhaust pipe in an engine as an internal combustion engine of a vehicle. The gas sensor includes a sensor cell having an exhaust gas electrode, an atmosphere side electrode and a solid electrolyte, and a heater that heats the sensor cell. The sensor control unit includes a heater control unit that controls a heater to heat a sensor cell. The heater control unit heats the sensor cell to be at an operation control temperature during the combustion operation of the engine and heats the sensor cell to be at an operation stop control temperature which is higher than the operation control temperature.
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公开(公告)号：US20190032588A1
公开(公告)日：2019-01-31
申请号：US16070894
申请日：2017-01-18
Applicant: DENSO CORPORATION
Inventor： Masahiro YAMAMOTO , Masayuki TAMURA , Takashi ARAKI , Go MIYAGAWA , Manabu YOSHIDOME , Masato KATSUNO , Toshihiro SAKAWA
Abstract: After an engine is started, an ECU performs first regeneration processing of a PM sensor through heating by a heater and, after the first regeneration processing, applies a voltage continuously to detection electrodes for a predetermined voltage application period. The ECU causes PM to adhere to an insulating substrate due to the voltage application and, at a time point after the predetermined time period has elapsed, determines the amount of PM that is adhering to the insulating substrate. When a predetermined condition is satisfied outside the voltage application period, the ECU determines whether the amount of adhering PM on the insulating substrate is equal to or greater than an excess determination threshold value. If the amount of adhering PM is determined to be equal to or greater than the excess determination threshold value, the ECU performs second regeneration processing of the PM sensor, through heating by the heater.
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10.发明申请公开(公告)号：US20190017918A1
公开(公告)日：2019-01-17
申请号：US16028610
申请日：2018-07-06
Applicant: DENSO CORPORATION
Inventor： Kensuke TAKIZAWA , Kazuhiko KOIKE , Go MIYAGAWA
Abstract: A failure detection device has a PM filter, a PM detection sensor having a sensor element arranged at a downstream of the PM filter, an ECU and a PM detection sensor control part. The sensor element detects an amount of PM in exhaust gas, and generates a sensor signal corresponding to the detected PM amount. A load detection part in the ECU detects an engine load. A judgment execution determination part in the control part compares the detected engine load with a threshold value, and determines whether a PM filter failure detection should be performed based on the comparison result. A failure judgment part compares the sensor signal with a failure judgment threshold value when the determination part decides that it is necessary to perform the failure detection of the PM filter, and determines that the PM filter failure has occurred based on the latter comparison result.
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