JP2010013959A - Diagnosis method of particulate filter - Google Patents
Diagnosis method of particulate filter Download PDFInfo
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- JP2010013959A JP2010013959A JP2008172880A JP2008172880A JP2010013959A JP 2010013959 A JP2010013959 A JP 2010013959A JP 2008172880 A JP2008172880 A JP 2008172880A JP 2008172880 A JP2008172880 A JP 2008172880A JP 2010013959 A JP2010013959 A JP 2010013959A
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Abstract
Description
本発明は、パティキュレートフィルタを備えた内燃機関の排気浄化装置に設置される、圧力センサ装置によるパティキュレートフィルタの異常診断に関する。 The present invention relates to abnormality diagnosis of a particulate filter by a pressure sensor device installed in an exhaust purification device of an internal combustion engine provided with the particulate filter.
ディーゼルエンジンの内燃機関では、内燃機関本体から排出される排ガス中に含まれる排気微粒子（以下、ＰＭという）が問題となっており、ＰＭを捕集するディーゼルパティキュレートフィルタ（以下、ＤＰＦという）の搭載義務付けが欧州中心に進んでいる。 In an internal combustion engine of a diesel engine, exhaust particulates (hereinafter referred to as PM) contained in exhaust gas discharged from the internal combustion engine main body has become a problem, and a diesel particulate filter (hereinafter referred to as DPF) that collects PM is a problem. Installation requirements are progressing mainly in Europe.
ＤＰＦにおいて目詰まりや破損などで異常が生じると、ＤＰＦ前後の差圧が正常な場合と比べて変化するため、これを利用してＤＰＦの異常を検出する。例えば、ＤＰＦ前後の差圧が定常時より上回った場合はＤＰＦの目詰まりと判断する。 When an abnormality occurs due to clogging or breakage in the DPF, the differential pressure before and after the DPF changes compared to the normal case, and this is used to detect an abnormality of the DPF. For example, if the differential pressure before and after the DPF exceeds the steady state, it is determined that the DPF is clogged.
上記ＤＰＦは、捕集したＰＭを燃焼させるため高温となるため、異常検出用の圧力センサ装置を直接ＤＰＦに設置できない。そのため、従来の構造としてＤＰＦから配管もしくはホースを備えることで圧力センサ装置へ圧力を伝播させる。そのため、低温環境下では上記配管及びホース内にＤＰＦから排出される水分，結露による水分などで配管及びホース内が氷結し圧力伝播しなくなる問題が生じる。この場合、ＤＰＦ前後の差圧では異常が診断できない可能性がある。 Since the DPF has a high temperature for burning the collected PM, a pressure sensor device for detecting an abnormality cannot be directly installed in the DPF. Therefore, pressure is propagated to the pressure sensor device by providing a pipe or hose from the DPF as a conventional structure. Therefore, in a low-temperature environment, there arises a problem that the pressure inside the pipe and the hose is frozen due to moisture discharged from the DPF in the pipe and the hose, moisture due to condensation, and the like, and the pressure does not propagate. In this case, there is a possibility that an abnormality cannot be diagnosed by the differential pressure before and after the DPF.
前記ＤＰＦと圧力センサ装置を圧力導入配管及びホースの異常検出においては、ＤＰＦ前後の差圧の変化では正確な異常診断ができない。 In detecting the abnormality of the pressure introduction pipe and the hose of the DPF and the pressure sensor device, an accurate abnormality diagnosis cannot be performed by a change in the differential pressure before and after the DPF.
本発明は、前記ＤＰＦの前詰まりや破損，圧力導入配管及びホースの氷結といった異常を診断することを目的とする。 An object of the present invention is to diagnose abnormalities such as pre-clogging or breakage of the DPF, icing of the pressure introduction pipe and the hose.
上記目的を達する為に、本発明では内燃機関本体から排出される排ガス中のＰＭを捕集ＤＰＦ及びＤＰＦと圧力センサ装置をつなぐ圧力導入配管もしくはホースの異常診断すべく、ＤＰＦ前後の差圧及びＤＰＦの前後それぞれの絶対圧を検出可能な圧力センサ装置を設置し、第１の段階としてＤＰＦ前後の差圧に基づき、ＤＰＦの目詰まり及び破損を診断し、第２の段階としてＤＰＦ前後のそれぞれの絶対圧値に基づき、圧力導入配管及びホースの目詰まりと診断する。 In order to achieve the above object, the present invention collects PM in exhaust gas discharged from the internal combustion engine main body, collects the DPF and the pressure difference between the front and rear of the DPF and the hose to diagnose the abnormality of the pressure introduction pipe or hose connecting the DPF and the pressure sensor device. A pressure sensor device capable of detecting the absolute pressure before and after the DPF is installed, and clogging and breakage of the DPF are diagnosed based on the differential pressure before and after the DPF as the first stage, and each before and after the DPF as the second stage. Diagnose clogging of pressure introduction pipe and hose based on absolute pressure value.
従来の差圧変化のみの診断では、ＤＰＦの前後どちらかの圧力導入配管及びホースの目詰まりが発生しても、差圧変化が発生し異常診断できない。一方、ＤＰＦの前後の絶対圧値が所定値と異なり且つ一定の圧力から変化しない場合に、圧力導入配管及びホースの目詰まりと診断することができる。 In the conventional diagnosis of only the differential pressure change, even if the pressure introduction pipe or the hose before or after the DPF is clogged, the differential pressure change occurs and the abnormality cannot be diagnosed. On the other hand, when the absolute pressure value before and after the DPF is different from the predetermined value and does not change from a constant pressure, it can be diagnosed that the pressure introduction pipe and the hose are clogged.
本発明によれば、圧力センサ装置の出力を基に、ＤＰＦ及び配管，ホースの異常を正確に診断することができる。 According to the present invention, it is possible to accurately diagnose abnormality of the DPF, the piping, and the hose based on the output of the pressure sensor device.
且つ、差圧及び絶対圧それぞれ出力可能な圧力センサ装置を備えることで安価で信頼性の高かい異常診断ができる。 In addition, by providing a pressure sensor device that can output differential pressure and absolute pressure, an inexpensive and highly reliable abnormality diagnosis can be performed.
以下に実施例について説明する。 Examples will be described below.
以下図１，図２を用いて、本発明の一実施形態，構成について説明する。 An embodiment and configuration of the present invention will be described below with reference to FIGS.
図１は本発明の圧力センサ装置を設けた内燃機関であるディーゼルエンジンの全体構成を示す。 FIG. 1 shows the overall configuration of a diesel engine which is an internal combustion engine provided with the pressure sensor device of the present invention.
内燃機関１の排気ポートに連なる排気通路２にはターボチャージャ３及びＤＰＦ４が設けられている。圧力センサ装置５は、ＤＰＦ４よりも上流側の排気通路６と連通する圧力導入管７とＤＰＦ４よりも下流側で排気通路６と連通する圧力導入管８との間に介設され、ＤＰＦ４の前後の差圧及びＤＰＦ４前後の絶対圧に応じた信号を出力し、ＥＣＵ９へ入力される。
A turbocharger 3 and a DPF 4 are provided in the
また吸入通路１０にはエアフローセンサ１１が設置されてあり、吸入空気量を検出する。吸入通路には、インタークーラー１２と吸気絞り弁１３が備えられており、インテークマニホールド１４に連通している。
An
さらに、排気通路２から排気再循環通路１５が連通され、ＥＧＲクーラー１６及び排気再循環通路絞り弁１７を備えている。
Further, an exhaust
ＥＣＵ９には、前記センサ類５，１１の出力信号や図示しない各種センサ類の出力信号が入力され、各部の状態が知らされるようになっている。
An output signal from the
図２は本発明に用いる圧力センサ装置の制御構成を示す。 FIG. 2 shows a control configuration of the pressure sensor device used in the present invention.
本実施例のＤＰＦ４の診断制御に用いる圧力センサ装置５は、ＤＰＦ４の上流側圧力を検出する素子１８とＤＰＦ４の下流側圧力を検出する素子１９と２つの検出された圧力信号より差圧を演算する回路２０より構成されている。
The
圧力センサ装置の出力は、ＤＰＦ４上流側の絶対圧及びＤＰＦ４の下流側の絶対圧と前記絶対圧を用いて演算されたＤＰＦ４前後の差圧がＥＣＵへ送られる。 As the output of the pressure sensor device, the absolute pressure on the upstream side of the DPF 4 and the absolute pressure on the downstream side of the DPF 4 and the differential pressure before and after the DPF 4 calculated using the absolute pressure are sent to the ECU.
特に内燃機関エンジンの排気ガスの圧力を測定する圧力センサ装置に関する。 In particular, the present invention relates to a pressure sensor device that measures the pressure of exhaust gas of an internal combustion engine.
１ 内燃機関
２，６ 排気通路
３ ターボチャージャ
４ ＤＰＦ
５ 圧力センサ装置
７ ＤＰＦ上流側圧力導入管
８ ＤＰＦ下流側圧力導入管
９ ＥＣＵ
１０ 吸気通路
１１ エアフローセンサ
１２ インタークーラー
１３ 吸気絞り弁
１４ インテークマニホールド
１５ 排気再循環通路
１６ ＥＧＲクーラー
1
5
10 Intake Passage 11
Claims (2)
検出された上流および下流の圧力に基づいて、パティキュレートフィルタの異常を検出するパティキュレートフィルタの診断方法。 The pressure upstream and downstream of the particulate filter that collects exhaust particulates installed in the exhaust system of the diesel engine is detected via a pressure introduction pipe or hose,
A particulate filter diagnosis method for detecting an abnormality of a particulate filter based on detected upstream and downstream pressures.
検出された上流および下流の圧力が前記ディーゼル機関の運転状態に関係なく一定値となった場合に、前記圧力導入配管またはホースに異常があると診断することを特徴とするパティキュレートフィルタの診断方法。 In claim 1,
A diagnostic method for a particulate filter, wherein when the detected upstream and downstream pressures become a constant value regardless of the operation state of the diesel engine, the pressure introduction pipe or the hose is diagnosed as having an abnormality. .
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| Application Number | Priority Date | Filing Date | Title |
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| JP2008172880A JP2010013959A (en) | 2008-07-02 | 2008-07-02 | Diagnosis method of particulate filter |
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| JP2008172880A JP2010013959A (en) | 2008-07-02 | 2008-07-02 | Diagnosis method of particulate filter |
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| JP2010013959A true JP2010013959A (en) | 2010-01-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011191278A (en) * | 2010-03-17 | 2011-09-29 | Hitachi Automotive Systems Ltd | Pressure sensor |
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2008
- 2008-07-02 JP JP2008172880A patent/JP2010013959A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011191278A (en) * | 2010-03-17 | 2011-09-29 | Hitachi Automotive Systems Ltd | Pressure sensor |
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