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公开(公告)号：US10352226B2
公开(公告)日：2019-07-16
申请号：US15538796
申请日：2015-12-21
Applicant: DENSO CORPORATION
Inventor： Kazuhiko Koike , Hironobu Shimokawa , Masayuki Tamura
Abstract: A particulate matter sensor detecting particulate matter in exhaust emissions is provided, which is resistant to having sensor surfaces buried by particulate matter residue. Detection electrodes are provided, with alternating polarity, laminated in a laminating direction, separated by insulation. Of the detection electrodes, first detection electrodes of one polarity and second detection electrodes of the other polarity are exposed perpendicular to the laminating direction. In the direction perpendicular to the laminating direction, the particulate matter sensor has target accumulating parts on which the particulate matter is accumulated. In the target accumulating parts, the thickness W1 of the first detection electrodes in the laminating direction is greater than the thickness W2 of the second detection electrodes in the laminating direction.
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公开(公告)号：US10794811B2
公开(公告)日：2020-10-06
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：US10557815B2
公开(公告)日：2020-02-11
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
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：US10422295B2
公开(公告)日：2019-09-24
申请号：US15740919
申请日：2016-06-30
Applicant: DENSO CORPORATION
Inventor： Masahiro Yamamoto , Manabu Yoshidome , Masayuki Tamura , Go Miyagawa
IPC: F02D41/22 , F01N3/02 , F01N9/00 , F01N11/00 , F01N13/00 , F01N3/023 , G01N15/06 , F01N3/021 , F02D41/14 , G01N15/00 , G01N3/00 , G01N15/08
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：US10648381B2
公开(公告)日：2020-05-12
申请号：US15769794
申请日：2016-10-21
Applicant: DENSO CORPORATION
Inventor： Masayuki Tamura , Takashi Araki , Masahiro Yamamoto , Go Miyagawa , Manabu Yoshidome , Masato Katsuno , Toshihiro Sakawa
Abstract: A particulate matter detecting device includes: an element unit on which particulate matter contained in exhaust gas from an internal combustion engine is deposited; a heater that heats the element unit; a detecting unit that detects the amount of particulate matter on the basis of electrical characteristics of the element unit; and a control unit that controls the operation of the heater. For a predetermined period that does not include a period in which the particulate matter is deposited on the element unit, the control unit operates the heater using a predetermined amount of control set in advance such that the temperature of the element unit is higher than the temperature of the exhaust gas and lower than a predetermined temperature at which the element unit is thermally degraded.
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Patent Agency Ranking
公开(公告)号：US10578518B2
公开(公告)日：2020-03-03
申请号：US15516163
申请日：2015-10-02
Applicant: DENSO CORPORATION
Inventor： Hironobu Shimokawa , Kazuhiko Koike , Kensuke Takizawa , Manabu Yoshidome , Masayuki Tamura
IPC: G01M15/10 , G01N15/02 , F02D41/14 , F02D41/02 , G01N15/06 , G01N1/22 , G01N35/00 , G01N27/04 , F01N3/021 , F01N11/00 , G01N15/08
Abstract: A control unit (6) estimates an output value of a PM sensor (S2) located at a downstream side of a DPF used as a reference filter, and detects whether the estimated output value exceeds a predetermined value (S3). When the estimated output value exceeds the predetermined value (YES in S3), the control unit detects an output value of the PM sensor (S4), and a heater heats the PM sensor (S5). The control unit detects an output value of the PM sensor (S6) after the PM sensor is heated, and calculates a change ratio of the output values of the PM sensor before and after heating (S7). The control unit estimates an average particle size of PM based on the calculated change ratio (S8), and detects whether the DPF has failed based on a comparison result of a corrected output value of the PM sensor with a threshold value.
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公开(公告)号：US10371615B2
公开(公告)日：2019-08-06
申请号：US15520206
申请日：2015-10-08
Applicant: DENSO CORPORATION
Inventor： Go Miyagawa , Masayuki Tamura
Abstract: A particulate matter detection sensor has an accumulation section for accumulating a part of particulate matter particles contained in exhaust gas emitted from an internal combustion engine, and a pair of a first detection electrode and a second detection electrode formed on the accumulation section. The second detection electrode is formed separated from the first detection electrode. The first detection electrode has projecting parts which project toward the second detection electrode. Because a separation between the first and second detection electrodes is locally reduced at the projecting parts, the projecting parts attract and accumulate more particulate matter, and this structure makes it possible to allow the particulate matter detection sensor to have improved detection sensitivity.
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公开(公告)号：US10352842B2
公开(公告)日：2019-07-16
申请号：US15524738
申请日：2015-09-08
Applicant: DENSO CORPORATION
Inventor： Kazuhiko Koike , Hironobu Shimokawa , Masayuki Tamura , Go Miyagawa , Tomotaka Mouri
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：US10337974B2
公开(公告)日：2019-07-02
申请号：US15569510
申请日：2016-04-12
Applicant: DENSO CORPORATION
Inventor： Tomotaka Mouri , Masayuki Tamura , Masahiro Yamamoto , Go Miyagawa , Hironobu Shimokawa , Kazuhiko Koike
Abstract: A particulate matter detection sensor has an element part for detecting an amount of PM contained in exhaust gas emitted from an internal combustion engine. A deposition part and at least a pair of detection electrodes are formed on an end surface of the element part. Some of particles of PM is deposited on the deposition part. The pair of detection electrodes are arranged on the deposition part. The particulate matter detection sensor changes its output electrical signal according to variation of electrical properties between the pair of the detection electrodes due to deposition of PM on the deposition part. A concave collection part is formed on the deposition part. The concave collection part has a concaved shape when viewed from the edge surface of the element part.
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公开(公告)号：US10208643B2
公开(公告)日：2019-02-19
申请号：US15319541
申请日：2015-06-12
Applicant: DENSO CORPORATION
Inventor： Go Miyagawa , Hirokatsu Imagawa , Masayuki Tamura
Abstract: A particulate matter detection apparatus includes a particulate matter quantity detection means, a temperature detection means that detects the temperature of exhaust gas, a control unit and a heating means. The particulate matter quantity detection means includes a particulate matter deposition portion that deposits thereon part of particulate matter contained in the exhaust gas emitted from an internal combustion engine and a pair of opposite electrodes arranged apart from each other on the particulate matter deposition portion. The control unit determines a deposition quantity of the particulate matter on the particulate matter deposition portion based on an electrical signal outputted by the particulate matter quantity detection means and receives information on the temperature of the exhaust gas detected by the temperature detection means. The control unit controls the heating means to heat the particulate matter deposition portion to 300° C.-800° C. during a cold start of the internal combustion engine.
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