公开(公告)号：US11035283B2

公开(公告)日：2021-06-15

申请号：US16832433

申请日：2020-03-27

Applicant: DENSO CORPORATION

Inventor： Yuki Murayama ,  Ryozo Kayama ,  Yusuke Todo ,  Manabu Yoshidome

IPC: F01N11/00 ,  C25B1/04 ,  G01N27/40 ,  G01N27/41 ,  G01N27/406

Abstract: A microcomputer includes a voltage application unit that selectively applies a normal voltage and a removal voltage higher than the normal voltage to a first cell of the exhaust gas sensor. The first cell is configured to remove, based on the removal voltage, oxygen in an exhaust gas from an internal combustion engine. The microcomputer includes an element temperature measurement unit that measures an element temperature parameter indicative of a temperature of the first cell. The microcomputer includes a termination determination unit that determines, based on the element temperature parameter, a termination time of terminating the application of the removal voltage to the first cell by the voltage application unit.

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

IPC: F01N3/023 ,  G01N27/04 ,  G01N15/06 ,  F01N3/00 ,  F02D41/14

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：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.

公开(公告)号：US11092099B2

公开(公告)日：2021-08-17

申请号：US16832521

申请日：2020-03-27

Applicant: DENSO CORPORATION

Inventor： Yuki Murayama ,  Ryozo Kayama ,  Yusuke Todo ,  Manabu Yoshidome

IPC: F02D41/14 ,  F01N11/00 ,  G01N27/41 ,  G01M15/10

Abstract: It is to determine whether a temperature rise condition of a first cell or a second cell is satisfied based on whether a first parameter has exceeded a predetermined first threshold or a second parameter has exceeded a predetermined second threshold. After satisfaction of the temperature rise condition, it is to determine that an exhaust gas sensor is in an active state upon determination that a corresponding time condition is satisfied.

公开(公告)号：US09863301B2

公开(公告)日：2018-01-09

申请号：US14607666

申请日：2015-01-28

Applicant: DENSO CORPORATION

Inventor： Manabu Yoshidome ,  Masato Katsuno

IPC: F01N11/00

CPC classification number: F01N11/00 ,  F01N2550/04 ,  F01N2560/05 ,  F01N2900/1606 ,  Y02T10/47

Abstract: A filter fault detection apparatus for a filter mounted on an exhaust passage of an internal combustion engine for collecting particulate matter includes a sensor mounted on the exhaust passage downstream of the filter. The sensor includes an insulative sensor element formed with a pair of electrodes on which particulate matter is collected, the sensor generating a sensor output corresponding to an amount of particulate matter collected on the sensor element when the electrodes become electrically conductive therebetween, causing the sensor output to rise. The apparatus further includes an acquiring unit that acquires, as an output variation, a temporal variation of the sensor output after rise of the sensor output, and a fault determination unit that performs a fault detection process for detecting presence of a fault in the filter based on the output variation of the sensor output to determine whether the filter is normal or faulty.

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

IPC: G01N15/06 ,  F01N11/00 ,  F01N3/023 ,  F01N13/00

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.

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.