WO2024004082A1 - Determination device and determination method - Google Patents

Determination device and determination method Download PDF

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Publication number
WO2024004082A1
WO2024004082A1 PCT/JP2022/025981 JP2022025981W WO2024004082A1 WO 2024004082 A1 WO2024004082 A1 WO 2024004082A1 JP 2022025981 W JP2022025981 W JP 2022025981W WO 2024004082 A1 WO2024004082 A1 WO 2024004082A1
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Prior art keywords
exhaust gas
differential pressure
particulate matter
amount
less
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PCT/JP2022/025981
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French (fr)
Japanese (ja)
Inventor
芽 松尾
幸久 筧
俊央 松本
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いすゞ自動車株式会社
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Priority to PCT/JP2022/025981 priority Critical patent/WO2024004082A1/en
Publication of WO2024004082A1 publication Critical patent/WO2024004082A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present disclosure relates to a determination device and a determination method used in an exhaust gas purification system.
  • an exhaust gas purification system also referred to as an after-treatment system
  • this exhaust gas purification system is provided with a member (a catalyst or a filter; hereinafter referred to as an exhaust gas purification member) for purifying exhaust gas and a sensor.
  • Patent Document 1 discloses an exhaust gas purification system in which an oxidation catalyst, a particulate matter collection filter, and a selective reduction catalyst are provided in the exhaust pipe in order from the upstream side in the flow direction of exhaust gas. Further, this exhaust gas purification system is provided with a differential pressure sensor that detects the difference between the exhaust pressure on the upstream side and the exhaust pressure on the downstream side of the particulate filter in the exhaust pipe.
  • differential pressure sensor may fail or the exhaust gas purification member may be manually removed from the exhaust pipe.
  • An object of one aspect of the present disclosure is to provide a determination device and a determination method that allow a user to recognize failure of a differential pressure sensor or removal of an exhaust gas purification member.
  • a determination device detects a differential pressure between an exhaust gas purification member provided in an exhaust pipe through which exhaust gas discharged from an engine flows, and an upstream side and a downstream side of the exhaust gas purification member in the exhaust pipe.
  • a determination device for use in an exhaust gas purification system comprising: a differential pressure sensor that detects the differential pressure; and a particulate matter sensor that detects the amount of particulate matter in the exhaust gas flowing downstream of the exhaust gas purification member.
  • an input unit that acquires differential pressure information indicating the amount of particulate matter and particulate matter amount information indicating the amount of particulate matter; and determining whether the differential pressure is less than a first threshold value; a determination unit that determines whether the amount of particulate matter is less than a second threshold if the amount of particulate matter is less than one threshold; In one case, it is determined that the differential pressure sensor is malfunctioning, and if the amount of particulate matter is not less than the second threshold, it is determined that the exhaust gas purification member is removed from the exhaust pipe.
  • a determination method detects a differential pressure between an exhaust gas purification member provided in an exhaust pipe through which exhaust gas discharged from an engine flows, and an upstream side and a downstream side of the exhaust gas purification member in the exhaust pipe.
  • a determination method used in an exhaust gas purification system comprising: a differential pressure sensor that detects the amount of particulate matter in the exhaust gas flowing downstream of the exhaust gas purification member; a step of acquiring differential pressure information indicating the amount of particulate matter and particulate matter amount information indicating the amount of particulate matter; a step of determining whether the differential pressure is less than a first threshold; If the amount of particulate matter is less than a first threshold, determining whether the amount of particulate matter is less than a second threshold; and if the amount of particulate matter is less than the second threshold, the differential pressure sensor is malfunctioning; If it is determined that the particulate matter amount is not less than the second threshold value, determining that the exhaust gas purifying member is removed from the exhaust pipe.
  • a user can recognize failure of the differential pressure sensor or removal of the exhaust gas purification member.
  • FIG. 1 is a schematic diagram showing an example of the configuration of an exhaust gas purification system according to an embodiment of the present disclosure.
  • FIG. 2 is a block diagram illustrating an example of the configuration of a determination device according to an embodiment of the present disclosure.
  • FIG. 3 is a flowchart illustrating an example of the operation of the determination device according to the embodiment of the present disclosure.
  • FIG. 1 is a schematic diagram showing an example of an exhaust gas purification system 10.
  • the exhaust gas purification system 10 includes an exhaust pipe 1, DOC (Diesel Oxidation Catalyst) 2, DPF (Diesel Particulate Filter) 3, SCR (Selective Catalytic Reduction) 4, ASC (Ammonia Slip Catalyst) 5, It has a pressure sensor 6, a PM (Particulate Matter) sensor 7, and a determination device 100.
  • DOC Diesel Oxidation Catalyst
  • DPF Diesel Particulate Filter
  • SCR Selective Catalytic Reduction
  • ASC Ammonia Slip Catalyst
  • It has a pressure sensor 6, a PM (Particulate Matter) sensor 7, and a determination device 100.
  • each arrow shown inside the exhaust pipe 1 indicates the flow direction of exhaust gas.
  • the engine is a diesel engine
  • the present invention is not limited to this, and other types of engines (for example, gasoline engines) may be used.
  • the engine may be mounted on a moving body (for example, an automobile, a ship, a construction machine, an industrial machine, etc.), or may be a stationary engine.
  • a DOC 2, DPF 3, SCR 4, and ASC 5 are provided in order from the upstream side in the flow direction of exhaust gas.
  • DOC2 is a catalyst that oxidizes nitrogen monoxide and hydrocarbons in exhaust gas.
  • the DPF 3 is a filter that collects and removes particulate matter in exhaust gas.
  • DPF3 corresponds to an example of a "particulate matter collection filter.”
  • SCR4 is a catalyst that reduces NOx in exhaust gas to nitrogen using ammonia generated from urea water.
  • Urea water is injected into the exhaust pipe 1 by a urea water injection device (not shown).
  • ASC5 is a catalyst that oxidizes and decomposes ammonia that could not be consumed by SCR4.
  • DOC 2, DPF 3, SCR 4, and ASC 5 shown in FIG. 1 may be housed in a case that is detachable from the exhaust pipe 1.
  • the type and number of exhaust gas purifying members provided in the exhaust pipe 1 are not limited to those shown in FIG. 1.
  • the type of exhaust gas purification member is determined depending on the type of engine.
  • the differential pressure sensor 6 and the PM sensor 7 are electrically connected to the determination device 100.
  • the differential pressure sensor 6 detects the difference (hereinafter also simply referred to as "differential pressure") between the upstream exhaust pressure and the downstream exhaust pressure of the DPF 3 in the exhaust pipe 1 at any time. differential pressure information indicating the pressure) is output to the determination device 100.
  • the upstream exhaust pressure of the DPF 3 detected by the differential pressure sensor 6 may be the exhaust pressure between the DOC 2 and the DPF 3, or the exhaust pressure upstream of the DOC 2.
  • the PM sensor 7 detects the amount of particulate matter in the exhaust gas flowing downstream of the DPF 3 (here, the downstream side of the ASC 5) at any time, and detects particulate matter indicating the amount of particulate matter (hereinafter referred to as the detected PM amount).
  • the substance amount information is output to the determination device 100.
  • the PM sensor 7 is provided downstream of the ASC 5.
  • the present invention is not limited to this, and the PM sensor 7 may be provided downstream of the DPF 3 and upstream of the SCR 4. Alternatively, it may be provided downstream of the SCR 4 and upstream of the ASC 5. That is, the PM sensor 7 only needs to be provided downstream of the DPF 3.
  • the differential pressure sensor 6 detects the difference between the upstream exhaust pressure and the downstream exhaust pressure of the DPF 3, and the PM sensor 7 detects the amount of PM in the exhaust gas flowing downstream of the DPF 3.
  • the differential pressure sensor 6 detects the difference between the upstream exhaust pressure and the downstream exhaust pressure of the exhaust gas purification member other than the DPF 3, and the PM sensor 7 detects the amount of PM in the exhaust gas flowing downstream of the exhaust gas purification member. may be detected.
  • FIG. 2 is a block diagram showing a configuration example of the determination device 100.
  • the determination device 100 includes, as hardware, a CPU (Central Processing Unit), a ROM (Read Only Memory) that stores a computer program, a RAM (Random Access Memory) that is a working memory, etc. .
  • a CPU Central Processing Unit
  • ROM Read Only Memory
  • RAM Random Access Memory
  • Each function of the determination device 100 described below is realized by the CPU executing a computer program read from the ROM in the RAM.
  • the determination device 100 may be realized by, for example, an ECU (Electronic Control Unit).
  • the determination device 100 includes an input section 110, a determination section 120, and an output section 130.
  • the input unit 110 acquires differential pressure information from the differential pressure sensor 6.
  • the input unit 110 acquires particulate matter amount information from the PM sensor 7.
  • the determination unit 120 determines whether the detected differential pressure indicated by the differential pressure information is less than a predetermined differential pressure (hereinafter referred to as a set differential pressure; an example of a first threshold value).
  • the set differential pressure is a differential pressure determined according to the engine speed.
  • the determination unit 120 determines that the detected PM amount indicated in the particulate matter amount information is less than a predetermined PM amount (hereinafter referred to as set PM amount; an example of a second threshold value). Determine whether or not.
  • set PM amount an example of a second threshold value
  • the determination unit 120 determines that the differential pressure sensor 6 is malfunctioning.
  • the determination unit 120 determines that the DPF 3 is removed from the exhaust pipe 1.
  • set differential pressure and the set PM amount are determined in advance based on, for example, simulation results or evaluation using actual equipment (for example, the engine and the exhaust gas purification system 10).
  • the output unit 130 outputs determination result information indicating the determination result by the determination unit 120 (either failure of the differential pressure sensor 6 or removal of the DPF 3) to a predetermined device (not shown). Then, the predetermined device notifies the determination result information.
  • the predetermined device when the exhaust gas purification system 10 is mounted on a moving body, the predetermined device may be a notification device (for example, a lamp, a display, a speaker, etc.) mounted on the moving body, or a notification device installed outside the moving body.
  • computer for example, server, etc.
  • the determination result information output to a display or a computer may be information indicating a code consisting of a combination of numbers or alphabets.
  • the configuration of the determination device 100 has been described above.
  • FIG. 3 is a flowchart showing an example of the operation of the determination device 100.
  • the flow shown in FIG. 3 is started, for example, after starting the engine.
  • the input unit 110 acquires differential pressure information and particulate matter amount information (step S1).
  • the determination unit 120 determines whether the detected differential pressure indicated by the differential pressure information is less than the set differential pressure (step S2).
  • step S2 NO
  • the flow ends. In this case, the flow starts again from step S1.
  • step S3 determines whether the detected PM amount indicated in the particulate matter amount information is less than the set PM amount.
  • step S4 determines that the differential pressure sensor 6 is malfunctioning.
  • step S5 determines that the DPF 3 is removed from the exhaust pipe 1 (step S5).
  • the output unit 130 outputs the determination result information to a predetermined device (step S6). Thereafter, the predetermined device notifies the determination result information. Thereby, either a failure of the differential pressure sensor 6 or removal of the DPF 3 is notified.
  • the determination device 100 determines whether the detected PM amount is less than the set PM amount, and If the amount is less than the set PM amount, it is determined that the differential pressure sensor 6 is malfunctioning, and if the detected PM amount is not less than the set PM amount, it is determined that the DPF 3 is removed from the exhaust pipe 1.
  • the flow shown in FIG. (Example of the third threshold value) or more may be started.
  • the input unit 110 acquires information indicating the detected exhaust pressure from the differential pressure sensor 6, and then, when the determination unit 120 determines that the detected exhaust pressure is equal to or higher than the set exhaust pressure, The flow shown in FIG. 3 may be initiated.
  • the detected exhaust pressure may be detected by an exhaust pressure sensor (not shown) provided separately from the differential pressure sensor 6.
  • the above-mentioned set exhaust pressure is an exhaust pressure determined according to the engine rotation speed.
  • the set exhaust pressure is determined in advance based on, for example, simulation results or evaluation using actual equipment (eg, engine and exhaust gas purification system 10).
  • the determination device and method of the present disclosure are useful for determining whether an exhaust gas purification member has been removed or a sensor has failed in an exhaust gas purification system.

Abstract

A determination device and a determination method of the present invention allow a user to recognize the malfunction of a pressure differential sensor or the removal of an exhaust gas purifier component. The determination device includes: an input unit for acquiring pressure differential information indicating the pressure differential between the upstream and the downstream of an exhaust gas purifier component in an exhaust pipe, and acquiring particulate matter amount information indicating the amount of particulate matter in the exhaust gas flowing on the downstream side of the exhaust gas purifier component; and a determination unit for determining whether the pressure differential is less than a first threshold, and if the pressure differential is less than the first threshold, determining whether the amount of particulate matter is less than a second threshold. The determination unit determines that the pressure differential sensor is malfunctioning if the amount of particulate matter is less than the second threshold, and determines that the exhaust gas purifier component has been removed from the exhaust pipe if the amount of particulate matter is not less than the second threshold.

Description

判定装置および判定方法Judgment device and method
　本開示は、排ガス浄化システムで用いられる判定装置および判定方法に関する。 The present disclosure relates to a determination device and a determination method used in an exhaust gas purification system.
　従来、エンジンから排出された排ガスを浄化する構造（以下、排ガス浄化システムという。後処理システムといってもよい）が知られている。また、この排ガス浄化システムでは、排ガスを浄化するための部材（触媒またはフィルタ。以下、排ガス浄化部材という）や、センサが設けられることが知られている。 Conventionally, a structure for purifying exhaust gas emitted from an engine (hereinafter referred to as an exhaust gas purification system, also referred to as an after-treatment system) is known. Further, it is known that this exhaust gas purification system is provided with a member (a catalyst or a filter; hereinafter referred to as an exhaust gas purification member) for purifying exhaust gas and a sensor.
　例えば特許文献１には、排気管内において、排ガスの流れ方向の上流側から順に、酸化触媒、粒子状物質捕集フィルタ、選択還元型触媒が設けられた排ガス浄化システムが開示されている。また、この排ガス浄化システムでは、排気管内における微粒子捕集フィルタの上流側の排圧と下流側の排圧との差を検知する差圧センサが設けられている。 For example, Patent Document 1 discloses an exhaust gas purification system in which an oxidation catalyst, a particulate matter collection filter, and a selective reduction catalyst are provided in the exhaust pipe in order from the upstream side in the flow direction of exhaust gas. Further, this exhaust gas purification system is provided with a differential pressure sensor that detects the difference between the exhaust pressure on the upstream side and the exhaust pressure on the downstream side of the particulate filter in the exhaust pipe.
日本国特開２０２１－５０６５０号公報Japanese Patent Application Publication No. 2021-50650
　従来の排ガス浄化システムでは、差圧センサが故障したり、人手によって排ガス浄化部材が排気管から取り外されたりすることが想定される。 In conventional exhaust gas purification systems, it is assumed that the differential pressure sensor may fail or the exhaust gas purification member may be manually removed from the exhaust pipe.
　本開示の一態様の目的は、ユーザが差圧センサの故障または排ガス浄化部材の取り外しを認識することができる判定装置および判定方法を提供することである。 An object of one aspect of the present disclosure is to provide a determination device and a determination method that allow a user to recognize failure of a differential pressure sensor or removal of an exhaust gas purification member.
　本開示の一態様に係る判定装置は、エンジンから排出された排ガスが流れる排気管内に設けられた排ガス浄化部材と、前記排気管内における前記排ガス浄化部材の上流側と下流側との差圧を検知する差圧センサと、前記排ガス浄化部材の下流側を流れる前記排ガス中の粒子状物質量を検知する粒子状物質センサと、を備えた排ガス浄化システムで用いられる判定装置であって、前記差圧を示す差圧情報と、前記粒子状物質量を示す粒子状物質量情報とを取得する入力部と、前記差圧が第１閾値未満であるか否かを判定し、前記差圧が前記第１閾値未満である場合、前記粒子状物質量が第２閾値未満であるか否かを判定する判定部と、を有し、前記判定部は、前記粒子状物質量が前記第２閾値未満である場合、前記差圧センサが故障していると判定し、前記粒子状物質量が前記第２閾値未満ではない場合、前記排ガス浄化部材が前記排気管から取り外されていると判定する。 A determination device according to an aspect of the present disclosure detects a differential pressure between an exhaust gas purification member provided in an exhaust pipe through which exhaust gas discharged from an engine flows, and an upstream side and a downstream side of the exhaust gas purification member in the exhaust pipe. A determination device for use in an exhaust gas purification system, comprising: a differential pressure sensor that detects the differential pressure; and a particulate matter sensor that detects the amount of particulate matter in the exhaust gas flowing downstream of the exhaust gas purification member. an input unit that acquires differential pressure information indicating the amount of particulate matter and particulate matter amount information indicating the amount of particulate matter; and determining whether the differential pressure is less than a first threshold value; a determination unit that determines whether the amount of particulate matter is less than a second threshold if the amount of particulate matter is less than one threshold; In one case, it is determined that the differential pressure sensor is malfunctioning, and if the amount of particulate matter is not less than the second threshold, it is determined that the exhaust gas purification member is removed from the exhaust pipe.
　本開示の一態様に係る判定方法は、エンジンから排出された排ガスが流れる排気管内に設けられた排ガス浄化部材と、前記排気管内における前記排ガス浄化部材の上流側と下流側との差圧を検知する差圧センサと、前記排ガス浄化部材の下流側を流れる前記排ガス中の粒子状物質量を検知する粒子状物質センサと、を備えた排ガス浄化システムで用いられる判定方法であって、前記差圧を示す差圧情報と、前記粒子状物質量を示す粒子状物質量情報とを取得するステップと、前記差圧が第１閾値未満であるか否かを判定するステップと、前記差圧が前記第１閾値未満である場合、前記粒子状物質量が第２閾値未満であるか否かを判定するステップと、前記粒子状物質量が前記第２閾値未満である場合、前記差圧センサが故障していると判定し、前記粒子状物質量が前記第２閾値未満ではない場合、前記排ガス浄化部材が前記排気管から取り外されていると判定するステップと、を有する。 A determination method according to an aspect of the present disclosure detects a differential pressure between an exhaust gas purification member provided in an exhaust pipe through which exhaust gas discharged from an engine flows, and an upstream side and a downstream side of the exhaust gas purification member in the exhaust pipe. A determination method used in an exhaust gas purification system comprising: a differential pressure sensor that detects the amount of particulate matter in the exhaust gas flowing downstream of the exhaust gas purification member; a step of acquiring differential pressure information indicating the amount of particulate matter and particulate matter amount information indicating the amount of particulate matter; a step of determining whether the differential pressure is less than a first threshold; If the amount of particulate matter is less than a first threshold, determining whether the amount of particulate matter is less than a second threshold; and if the amount of particulate matter is less than the second threshold, the differential pressure sensor is malfunctioning; If it is determined that the particulate matter amount is not less than the second threshold value, determining that the exhaust gas purifying member is removed from the exhaust pipe.
　本開示によれば、ユーザが差圧センサの故障または排ガス浄化部材の取り外しを認識することができる。 According to the present disclosure, a user can recognize failure of the differential pressure sensor or removal of the exhaust gas purification member.
図１は、本開示の実施の形態に係る排ガス浄化システムの構成の一例を示す模式図である。FIG. 1 is a schematic diagram showing an example of the configuration of an exhaust gas purification system according to an embodiment of the present disclosure. 図２は、本開示の実施の形態に係る判定装置の構成の一例を示すブロック図である。FIG. 2 is a block diagram illustrating an example of the configuration of a determination device according to an embodiment of the present disclosure. 図３は、本開示の実施の形態に係る判定装置の動作の一例を示すフローチャートである。FIG. 3 is a flowchart illustrating an example of the operation of the determination device according to the embodiment of the present disclosure.
　以下、本開示の実施の形態について、図面を参照しながら説明する。 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
　まず、本実施の形態に係る排ガス浄化システム１０の構成について、図１を用いて説明する。図１は、排ガス浄化システム１０の一例を示す模式図である。 First, the configuration of the exhaust gas purification system 10 according to the present embodiment will be explained using FIG. 1. FIG. 1 is a schematic diagram showing an example of an exhaust gas purification system 10.
　図１に示すように、排ガス浄化システム１０は、排気管１、ＤＯＣ（Diesel Oxidation Catalyst）２、ＤＰＦ（Diesel Particulate Filter）３、ＳＣＲ（Selective Catalytic Reduction）４、ＡＳＣ（Ammonia Slip Catalyst）５、差圧センサ６、ＰＭ（Particulate Matter)センサ７、判定装置１００を有する。 As shown in FIG. 1, the exhaust gas purification system 10 includes an exhaust pipe 1, DOC (Diesel Oxidation Catalyst) 2, DPF (Diesel Particulate Filter) 3, SCR (Selective Catalytic Reduction) 4, ASC (Ammonia Slip Catalyst) 5, It has a pressure sensor 6, a PM (Particulate Matter) sensor 7, and a determination device 100.
　排気管１内には、ディーゼルエンジン（図示略）から排出された排ガスが流れる。図１において、排気管１内に示す各矢印は、排ガスの流れ方向を示している。 In the exhaust pipe 1, exhaust gas discharged from a diesel engine (not shown) flows. In FIG. 1, each arrow shown inside the exhaust pipe 1 indicates the flow direction of exhaust gas.
　なお、本実施の形態では、エンジンがディーゼルエンジンである場合を例に挙げて説明するが、これに限定されず、他の種類のエンジン（例えば、ガソリンエンジン）であってもよい。また、エンジンは、移動体（例えば、自動車、船舶、建設機械、または産業機械等）に搭載されるものであってもよいし、定置式のものであってもよい。 Note that in this embodiment, the case where the engine is a diesel engine will be described as an example, but the present invention is not limited to this, and other types of engines (for example, gasoline engines) may be used. Further, the engine may be mounted on a moving body (for example, an automobile, a ship, a construction machine, an industrial machine, etc.), or may be a stationary engine.
　排気管１内には、排ガスの流れ方向の上流側から順に、ＤＯＣ２、ＤＰＦ３、ＳＣＲ４、ＡＳＣ５（いずれも排ガス浄化部材の一例）が設けられている。 Inside the exhaust pipe 1, a DOC 2, DPF 3, SCR 4, and ASC 5 (all examples of exhaust gas purification members) are provided in order from the upstream side in the flow direction of exhaust gas.
　ＤＯＣ２は、排ガス中の一酸化窒素や炭化水素を酸化させる触媒である。 DOC2 is a catalyst that oxidizes nitrogen monoxide and hydrocarbons in exhaust gas.
　ＤＰＦ３は、排ガス中の粒子状物質を捕集して取り除くフィルタである。ＤＰＦ３は「粒子状物質捕集フィルタ」の一例に相当する。 The DPF 3 is a filter that collects and removes particulate matter in exhaust gas. DPF3 corresponds to an example of a "particulate matter collection filter."
　ＳＣＲ４は、尿素水から発生したアンモニアにより、排ガス中のＮＯｘを窒素に還元する触媒である。尿素水は、尿素水噴射装置（図示略）により排気管１内に噴射される。 SCR4 is a catalyst that reduces NOx in exhaust gas to nitrogen using ammonia generated from urea water. Urea water is injected into the exhaust pipe 1 by a urea water injection device (not shown).
　ＡＳＣ５は、ＳＣＲ４で消費しきれなかったアンモニアを酸化、分解する触媒である。 ASC5 is a catalyst that oxidizes and decomposes ammonia that could not be consumed by SCR4.
　なお、図１に示したＤＯＣ２、ＤＰＦ３、ＳＣＲ４、ＡＳＣ５は、排気管１に対して着脱可能なケースに収容されてもよい。 Note that the DOC 2, DPF 3, SCR 4, and ASC 5 shown in FIG. 1 may be housed in a case that is detachable from the exhaust pipe 1.
　また、排気管１内に設けられる排ガス浄化部材の種類および数は、図１に示すものに限定されない。特に、排ガス浄化部材の種類は、エンジンの種類に応じて決定されるものとする。 Further, the type and number of exhaust gas purifying members provided in the exhaust pipe 1 are not limited to those shown in FIG. 1. In particular, the type of exhaust gas purification member is determined depending on the type of engine.
　差圧センサ６およびＰＭセンサ７は、判定装置１００と電気的に接続されている。 The differential pressure sensor 6 and the PM sensor 7 are electrically connected to the determination device 100.
　差圧センサ６は、随時、排気管１内におけるＤＰＦ３の上流側排圧と下流側排圧との差（以下、単に「差圧」ともいう）を検知し、その差圧（以下、検知差圧という）を示す差圧情報を判定装置１００へ出力する。 The differential pressure sensor 6 detects the difference (hereinafter also simply referred to as "differential pressure") between the upstream exhaust pressure and the downstream exhaust pressure of the DPF 3 in the exhaust pipe 1 at any time. differential pressure information indicating the pressure) is output to the determination device 100.
　なお、差圧センサ６によって検知されるＤＰＦ３の上流側排圧は、ＤＯＣ２とＤＰＦ３との間の排圧でもよいし、ＤＯＣ２の上流側の排圧でもよい。 Note that the upstream exhaust pressure of the DPF 3 detected by the differential pressure sensor 6 may be the exhaust pressure between the DOC 2 and the DPF 3, or the exhaust pressure upstream of the DOC 2.
　ＰＭセンサ７は、随時、ＤＰＦ３の下流側（ここでは、ＡＳＣ５の下流側）を流れる排ガス中の粒子状物質量を検知し、その粒子状物質量（以下、検知ＰＭ量という）を示す粒子状物質量情報を判定装置１００へ出力する。 The PM sensor 7 detects the amount of particulate matter in the exhaust gas flowing downstream of the DPF 3 (here, the downstream side of the ASC 5) at any time, and detects particulate matter indicating the amount of particulate matter (hereinafter referred to as the detected PM amount). The substance amount information is output to the determination device 100.
　なお、本実施の形態では、ＰＭセンサ７が、ＡＳＣ５の下流側に設けられる場合を例に挙げて説明したが、これに限定されず、ＤＰＦ３の下流側かつＳＣＲ４の上流側に設けられてもよいし、ＳＣＲ４の下流側かつＡＳＣ５の上流側に設けられてもよい。すなわち、ＰＭセンサ７は、ＤＰＦ３の下流側に設けられればよい。 In this embodiment, the PM sensor 7 is provided downstream of the ASC 5. However, the present invention is not limited to this, and the PM sensor 7 may be provided downstream of the DPF 3 and upstream of the SCR 4. Alternatively, it may be provided downstream of the SCR 4 and upstream of the ASC 5. That is, the PM sensor 7 only needs to be provided downstream of the DPF 3.
　また、本実施の形態では、差圧センサ６がＤＰＦ３の上流側排圧と下流側排圧との差を検知し、ＰＭセンサ７がＤＰＦ３の下流側を流れる排ガス中のＰＭ量を検知する場合を例に挙げて説明したが、これに限定されない。すなわち、差圧センサ６は、ＤＰＦ３以外の排ガス浄化部材の上流側排圧と下流側排圧との差を検知し、ＰＭセンサ７は、その排ガス浄化部材の下流側を流れる排ガス中のＰＭ量を検知してもよい。 In the present embodiment, the differential pressure sensor 6 detects the difference between the upstream exhaust pressure and the downstream exhaust pressure of the DPF 3, and the PM sensor 7 detects the amount of PM in the exhaust gas flowing downstream of the DPF 3. Although the explanation has been given using an example, the present invention is not limited to this. That is, the differential pressure sensor 6 detects the difference between the upstream exhaust pressure and the downstream exhaust pressure of the exhaust gas purification member other than the DPF 3, and the PM sensor 7 detects the amount of PM in the exhaust gas flowing downstream of the exhaust gas purification member. may be detected.
　判定装置１００の詳細については、後述する。 Details of the determination device 100 will be described later.
　以上、排ガス浄化システム１０の構成について説明した。 The configuration of the exhaust gas purification system 10 has been described above.
　次に、本実施の形態に係る判定装置１００の構成について、図２を用いて説明する。図２は、判定装置１００の構成例を示すブロック図である。 Next, the configuration of the determination device 100 according to this embodiment will be described using FIG. 2. FIG. 2 is a block diagram showing a configuration example of the determination device 100.
　図示は省略するが、判定装置１００は、ハードウェアとして、例えば、ＣＰＵ（Central Processing Unit）、コンピュータプログラムを格納したＲＯＭ（Read Only Memory）、作業用メモリであるＲＡＭ（Random Access Memory）等を有する。以下に説明する判定装置１００の各機能は、ＣＰＵがＲＯＭから読み出したコンピュータプログラムをＲＡＭにて実行することにより実現される。判定装置１００は、例えば、ＥＣＵ（Electronic Control Unit）によって実現されてもよい。 Although not shown, the determination device 100 includes, as hardware, a CPU (Central Processing Unit), a ROM (Read Only Memory) that stores a computer program, a RAM (Random Access Memory) that is a working memory, etc. . Each function of the determination device 100 described below is realized by the CPU executing a computer program read from the ROM in the RAM. The determination device 100 may be realized by, for example, an ECU (Electronic Control Unit).
　図２に示すように、判定装置１００は、入力部１１０、判定部１２０、出力部１３０を有する。 As shown in FIG. 2, the determination device 100 includes an input section 110, a determination section 120, and an output section 130.
　入力部１１０は、差圧センサ６から差圧情報を取得する。 The input unit 110 acquires differential pressure information from the differential pressure sensor 6.
　また、入力部１１０は、ＰＭセンサ７から粒子状物質量情報を取得する。 Additionally, the input unit 110 acquires particulate matter amount information from the PM sensor 7.
　判定部１２０は、差圧情報に示される検知差圧が、予め定められた差圧（以下、設定差圧という。第１閾値の一例）未満であるか否かを判定する。設定差圧は、エンジンの回転数に応じて定められた差圧である。 The determination unit 120 determines whether the detected differential pressure indicated by the differential pressure information is less than a predetermined differential pressure (hereinafter referred to as a set differential pressure; an example of a first threshold value). The set differential pressure is a differential pressure determined according to the engine speed.
　検知差圧が設定差圧未満である場合、判定部１２０は、粒子状物質量情報に示される検知ＰＭ量が予め定められたＰＭ量（以下、設定ＰＭ量という。第２閾値の一例）未満であるか否かを判定する。 When the detected differential pressure is less than the set differential pressure, the determination unit 120 determines that the detected PM amount indicated in the particulate matter amount information is less than a predetermined PM amount (hereinafter referred to as set PM amount; an example of a second threshold value). Determine whether or not.
　検知ＰＭ量が設定ＰＭ量未満である場合、判定部１２０は、差圧センサ６が故障していると判定する。 If the detected PM amount is less than the set PM amount, the determination unit 120 determines that the differential pressure sensor 6 is malfunctioning.
　一方、検知ＰＭ量が設定ＰＭ量未満ではない場合、判定部１２０は、ＤＰＦ３が排気管１から取り外されていると判定する。 On the other hand, if the detected PM amount is not less than the set PM amount, the determination unit 120 determines that the DPF 3 is removed from the exhaust pipe 1.
　なお、設定差圧および設定ＰＭ量は、例えば、シミュレーションの結果、または、実機（例えば、エンジンおよび排ガス浄化システム１０）による評価等に基づいて、予め定められる。 Note that the set differential pressure and the set PM amount are determined in advance based on, for example, simulation results or evaluation using actual equipment (for example, the engine and the exhaust gas purification system 10).
　出力部１３０は、判定部１２０による判定結果（差圧センサ６の故障、または、ＤＰＦ３の取り外しのいずれか）を示す判定結果情報を、所定装置（図示略）へ出力する。そして、所定装置は、判定結果情報の報知を行う。 The output unit 130 outputs determination result information indicating the determination result by the determination unit 120 (either failure of the differential pressure sensor 6 or removal of the DPF 3) to a predetermined device (not shown). Then, the predetermined device notifies the determination result information.
　例えば、排ガス浄化システム１０が移動体に搭載されている場合、所定装置としては、その移動体に搭載された報知デバイス（例えば、ランプ、ディスプレイ、スピーカ等）、または、移動体の外部に設置されたコンピュータ（例えば、サーバ等）が挙げられる。また、例えば、ディスプレイやコンピュータに出力される判定結果情報は、数字やアルファベットの組み合わせからなるコードを示す情報であってもよい。 For example, when the exhaust gas purification system 10 is mounted on a moving body, the predetermined device may be a notification device (for example, a lamp, a display, a speaker, etc.) mounted on the moving body, or a notification device installed outside the moving body. computer (for example, server, etc.). Further, for example, the determination result information output to a display or a computer may be information indicating a code consisting of a combination of numbers or alphabets.
　以上、判定装置１００の構成について説明した。 The configuration of the determination device 100 has been described above.
　次に、判定装置１００の動作について、図３を用いて説明する。図３は、判定装置１００の動作例を示すフローチャートである。図３に示すフローは、例えば、エンジンの始動後に開始される。 Next, the operation of the determination device 100 will be explained using FIG. 3. FIG. 3 is a flowchart showing an example of the operation of the determination device 100. The flow shown in FIG. 3 is started, for example, after starting the engine.
　まず、入力部１１０は、差圧情報および粒子状物質量情報を取得する（ステップＳ１）。 First, the input unit 110 acquires differential pressure information and particulate matter amount information (step S1).
　次に、判定部１２０は、差圧情報に示される検知差圧が設定差圧未満であるか否かを判定する（ステップＳ２）。 Next, the determination unit 120 determines whether the detected differential pressure indicated by the differential pressure information is less than the set differential pressure (step S2).
　検知差圧が設定差圧未満ではない場合（ステップＳ２：ＮＯ）、フローは終了する。この場合、再度、フローは、ステップＳ１から開始される。 If the detected differential pressure is not less than the set differential pressure (step S2: NO), the flow ends. In this case, the flow starts again from step S1.
　一方、検知差圧が設定差圧未満である場合（ステップＳ２：ＹＥＳ）、判定部１２０は、粒子状物質量情報に示される検知ＰＭ量が設定ＰＭ量未満であるか否かを判定する（ステップＳ３）。 On the other hand, if the detected differential pressure is less than the set differential pressure (step S2: YES), the determination unit 120 determines whether the detected PM amount indicated in the particulate matter amount information is less than the set PM amount ( Step S3).
　検知ＰＭ量が設定ＰＭ量未満である場合（ステップＳ３：ＹＥＳ）、判定部１２０は、差圧センサ６が故障していると判定する（ステップＳ４）。 If the detected PM amount is less than the set PM amount (step S3: YES), the determination unit 120 determines that the differential pressure sensor 6 is malfunctioning (step S4).
　一方、検知ＰＭ量が設定ＰＭ量未満ではない場合（ステップＳ３：ＮＯ）、判定部１２０は、排気管１からＤＰＦ３が取り外されていると判定する（ステップＳ５）。 On the other hand, if the detected PM amount is not less than the set PM amount (step S3: NO), the determination unit 120 determines that the DPF 3 is removed from the exhaust pipe 1 (step S5).
　次に、出力部１３０は、判定結果情報を所定装置へ出力する（ステップＳ６）。その後、所定装置は、判定結果情報の報知を行う。これにより、差圧センサ６の故障、または、ＤＰＦ３の取り外しのいずれかが報知される。 Next, the output unit 130 outputs the determination result information to a predetermined device (step S6). Thereafter, the predetermined device notifies the determination result information. Thereby, either a failure of the differential pressure sensor 6 or removal of the DPF 3 is notified.
　以上、判定装置１００の動作について説明した。 The operation of the determination device 100 has been described above.
　ここまで詳述したように、本実施の形態の判定装置１００は、検知差圧が設定差圧未満である場合に、検知ＰＭ量が設定ＰＭ量未満であるか否かを判定し、検知ＰＭ量が設定ＰＭ量未満である場合、差圧センサ６が故障していると判定し、検知ＰＭ量が設定ＰＭ量未満ではない場合、ＤＰＦ３が排気管１から取り外されていると判定することを特徴とする。これにより、ユーザが差圧センサの故障または排ガス浄化部材の取り外しを認識することができる。 As described in detail so far, when the detected differential pressure is less than the set differential pressure, the determination device 100 determines whether the detected PM amount is less than the set PM amount, and If the amount is less than the set PM amount, it is determined that the differential pressure sensor 6 is malfunctioning, and if the detected PM amount is not less than the set PM amount, it is determined that the DPF 3 is removed from the exhaust pipe 1. Features. This allows the user to recognize failure of the differential pressure sensor or removal of the exhaust gas purification member.
　なお、本開示は、上記実施の形態の説明に限定されず、その趣旨を逸脱しない範囲において種々の変形が可能である。 Note that the present disclosure is not limited to the description of the above embodiments, and various modifications can be made without departing from the spirit thereof.
　例えば、実施の形態において、図３に示すフローは、排気管１内におけるＤＰＦ３の上流側で検知された排圧（以下、検知排圧という）が予め定められた排圧（以下、設定排圧という。第３閾値の一例）以上である場合に開始されてもよい。 For example, in the embodiment, the flow shown in FIG. (Example of the third threshold value) or more may be started.
　具体的には、まず、入力部１１０が検知排圧を示す情報を差圧センサ６から取得し、次に、判定部１２０が、検知排圧が設定排圧以上であると判定した場合に、図３に示すフローが開始されてもよい。なお、検知排圧は、差圧センサ６とは別に設けられた排圧センサ（図示略）によって検知されてもよい。 Specifically, first, the input unit 110 acquires information indicating the detected exhaust pressure from the differential pressure sensor 6, and then, when the determination unit 120 determines that the detected exhaust pressure is equal to or higher than the set exhaust pressure, The flow shown in FIG. 3 may be initiated. Note that the detected exhaust pressure may be detected by an exhaust pressure sensor (not shown) provided separately from the differential pressure sensor 6.
　なお、上記設定排圧は、エンジンの回転数に応じて定められた排圧である。設定排圧は、例えば、シミュレーションの結果、または、実機（例えば、エンジンおよび排ガス浄化システム１０）による評価等に基づいて、予め定められる。 Note that the above-mentioned set exhaust pressure is an exhaust pressure determined according to the engine rotation speed. The set exhaust pressure is determined in advance based on, for example, simulation results or evaluation using actual equipment (eg, engine and exhaust gas purification system 10).
　本開示の判定装置および判定方法は、排ガス浄化システムにおける排ガス浄化部材の取り外しの発生またはセンサの故障の発生の判定に有用である。 The determination device and method of the present disclosure are useful for determining whether an exhaust gas purification member has been removed or a sensor has failed in an exhaust gas purification system.
　１　排気管
　２　ＤＯＣ
　３　ＤＰＦ
　４　ＳＣＲ
　５　ＡＳＣ
　６　差圧センサ
　７　ＰＭセンサ
　１０　排ガス浄化システム
　１００　判定装置
　１１０　入力部
　１２０　判定部
　１３０　出力部 1 Exhaust pipe 2 DOC
3DPF
4 SCR
5.ASC
6 differential pressure sensor 7 PM sensor 10 exhaust gas purification system 100 determination device 110 input section 120 determination section 130 output section

Claims (5)

  1. 　エンジンから排出された排ガスが流れる排気管内に設けられた排ガス浄化部材と、前記排気管内における前記排ガス浄化部材の上流側と下流側との差圧を検知する差圧センサと、前記排ガス浄化部材の下流側を流れる前記排ガス中の粒子状物質量を検知する粒子状物質センサと、を備えた排ガス浄化システムで用いられる判定装置であって、
    　前記差圧を示す差圧情報と、前記粒子状物質量を示す粒子状物質量情報とを取得する入力部と、
    　前記差圧が第１閾値未満であるか否かを判定し、前記差圧が前記第１閾値未満である場合、前記粒子状物質量が第２閾値未満であるか否かを判定する判定部と、を有し、
    　前記判定部は、
    　前記粒子状物質量が前記第２閾値未満である場合、前記差圧センサが故障していると判定し、前記粒子状物質量が前記第２閾値未満ではない場合、前記排ガス浄化部材が前記排気管から取り外されていると判定する、
    　判定装置。     an exhaust gas purification member provided in an exhaust pipe through which exhaust gas discharged from the engine flows; a differential pressure sensor that detects a differential pressure between an upstream side and a downstream side of the exhaust gas purification member in the exhaust pipe; A determination device used in an exhaust gas purification system, comprising a particulate matter sensor that detects the amount of particulate matter in the exhaust gas flowing downstream,
    an input unit that acquires differential pressure information indicating the differential pressure and particulate matter amount information indicating the particulate matter amount;
    a determination unit that determines whether the differential pressure is less than a first threshold, and if the differential pressure is less than the first threshold, determines whether the amount of particulate matter is less than a second threshold; and,
    The determination unit includes:
    If the amount of particulate matter is less than the second threshold, it is determined that the differential pressure sensor is malfunctioning, and if the amount of particulate matter is not less than the second threshold, the exhaust gas purification member determine that it has been removed from the pipe,
    Judgment device.
  2. 　前記判定部は、
    　前記排気管内における前記排ガス浄化部材の上流側の排圧が第３閾値以上である場合、前記差圧が前記第１閾値未満であるか否かを判定する、
    　請求項１に記載の判定装置。     The determination unit includes:
    If the exhaust pressure upstream of the exhaust gas purification member in the exhaust pipe is equal to or higher than a third threshold, determining whether the differential pressure is less than the first threshold;
    The determination device according to claim 1.
  3. 　前記差圧センサの故障、または、前記排ガス浄化部材の取り外しのいずれかを示す情報を、所定装置へ出力する出力部をさらに有する、
    　請求項１に記載の判定装置。     further comprising an output unit that outputs information indicating either a failure of the differential pressure sensor or removal of the exhaust gas purification member to a predetermined device;
    The determination device according to claim 1.
  4. 　前記排ガス浄化部材は、
    　前記排ガス中の粒子状物質を捕集するフィルタである、
    　請求項１に記載の判定装置。     The exhaust gas purification member is
    A filter that collects particulate matter in the exhaust gas,
    The determination device according to claim 1.
  5. 　エンジンから排出された排ガスが流れる排気管内に設けられた排ガス浄化部材と、前記排気管内における前記排ガス浄化部材の上流側と下流側との差圧を検知する差圧センサと、前記排ガス浄化部材の下流側を流れる前記排ガス中の粒子状物質量を検知する粒子状物質センサと、を備えた排ガス浄化システムで用いられる判定方法であって、
    　前記差圧を示す差圧情報と、前記粒子状物質量を示す粒子状物質量情報とを取得するステップと、
    　前記差圧が第１閾値未満であるか否かを判定するステップと、
    　前記差圧が前記第１閾値未満である場合、前記粒子状物質量が第２閾値未満であるか否かを判定するステップと、
    　前記粒子状物質量が前記第２閾値未満である場合、前記差圧センサが故障していると判定し、前記粒子状物質量が前記第２閾値未満ではない場合、前記排ガス浄化部材が前記排気管から取り外されていると判定するステップと、を有する、
    　判定方法。     an exhaust gas purification member provided in an exhaust pipe through which exhaust gas discharged from the engine flows; a differential pressure sensor that detects a differential pressure between an upstream side and a downstream side of the exhaust gas purification member in the exhaust pipe; A determination method used in an exhaust gas purification system comprising: a particulate matter sensor that detects the amount of particulate matter in the exhaust gas flowing downstream,
    acquiring differential pressure information indicating the differential pressure and particulate matter amount information indicating the amount of particulate matter;
    determining whether the differential pressure is less than a first threshold;
    If the differential pressure is less than the first threshold, determining whether the amount of particulate matter is less than a second threshold;
    If the amount of particulate matter is less than the second threshold, it is determined that the differential pressure sensor is malfunctioning, and if the amount of particulate matter is not less than the second threshold, the exhaust gas purification member and determining that the tube is removed from the tube.
    Judgment method.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008215535A (en) * 2007-03-06 2008-09-18 Toyota Motor Corp Controller of diesel vehicle
WO2015093603A1 (en) * 2013-12-19 2015-06-25 トヨタ自動車株式会社 Exhaust gas purification system for internal combustion engine
JP2016196835A (en) * 2015-04-02 2016-11-24 トヨタ自動車株式会社 Abnormality diagnostic device for particulate filter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008215535A (en) * 2007-03-06 2008-09-18 Toyota Motor Corp Controller of diesel vehicle
WO2015093603A1 (en) * 2013-12-19 2015-06-25 トヨタ自動車株式会社 Exhaust gas purification system for internal combustion engine
JP2016196835A (en) * 2015-04-02 2016-11-24 トヨタ自動車株式会社 Abnormality diagnostic device for particulate filter

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