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

IPC: F02D41/14 ,  G01N15/06 ,  F01N11/00

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.

公开(公告)号：US20180266934A1

公开(公告)日：2018-09-20

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

IPC: G01N15/06 ,  G01M15/10

CPC classification number: G01N15/0656 ,  G01M15/102 ,  G01N15/0606 ,  G01N2015/0046

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.

公开(公告)号：US20180159304A1

公开(公告)日：2018-06-07

申请号：US15828927

申请日：2017-12-01

Applicant: DENSO CORPORATION

Inventor： Masayuki TAMURA ,  Yuji KAJI ,  Yoshinori DOI ,  Shinya TANAKA ,  Atsushi YOSHIDA

IPC: H01T13/32 ,  H01T21/02 ,  B32B15/01 ,  H01T13/39

CPC classification number: H01T13/32 ,  B32B15/01 ,  H01T13/39 ,  H01T21/02

Abstract: A pipe material used as a discharge electrode of a spark plug for an internal combustion engine comprises an outer layer made of a Ni-based alloy, an inner layer made of a Pt-based alloy provided inside the outer layer, and an intermediate layer provided between the outer layer and the inner layer.

公开(公告)号：US20170307501A1

公开(公告)日：2017-10-26

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: G01N15/08 ,  F01N11/00 ,  G01N27/04 ,  G01N15/02 ,  G01M15/10 ,  F01N3/021

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.

公开(公告)号：US20180313243A1

公开(公告)日：2018-11-01

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

IPC: F01N3/023 ,  G01N15/06 ,  G01N27/04 ,  F02D41/14

CPC classification number: F01N3/00 ,  F01N3/023 ,  G01N15/06 ,  G01N27/04

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.

公开(公告)号：US20170315042A1

公开(公告)日：2017-11-02

申请号：US15520206

申请日：2015-10-08

Applicant: DENSO CORPORATION

Inventor： Go MIYAGAWA ,  Masayuki TAMURA

IPC: G01N15/06 ,  G01N27/04 ,  F02D41/14 ,  G01N15/00 ,  F01N11/00

CPC classification number: G01N15/0618 ,  F01N11/00 ,  F01N2550/04 ,  F01N2560/05 ,  F02D41/1444 ,  G01N15/06 ,  G01N15/0656 ,  G01N27/04 ,  G01N2015/0046 ,  Y02T10/47

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.

公开(公告)号：US20170122179A1

公开(公告)日：2017-05-04

申请号：US15319541

申请日：2015-06-12

Applicant: DENSO CORPORATION

Inventor： Go MIYAGAWA ,  Hirokatsu IMAGAWA ,  Masayuki TAMURA

IPC: F01N11/00 ,  F01N3/021 ,  G01N27/04

CPC classification number: F01N11/002 ,  F01N3/021 ,  F01N2330/06 ,  F01N2560/05 ,  F01N2560/06 ,  F01N2900/1404 ,  F02D41/061 ,  F02D41/064 ,  F02D41/1446 ,  F02D41/1466 ,  F02D41/1494 ,  F02D41/222 ,  G01N15/0606 ,  G01N15/0656 ,  G01N27/04 ,  G01N2015/0046 ,  Y02T10/40

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.