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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：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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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
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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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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