JP2016098755A - Engine oil deterioration determination method - Google Patents

Engine oil deterioration determination method Download PDF

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JP2016098755A
JP2016098755A JP2014237647A JP2014237647A JP2016098755A JP 2016098755 A JP2016098755 A JP 2016098755A JP 2014237647 A JP2014237647 A JP 2014237647A JP 2014237647 A JP2014237647 A JP 2014237647A JP 2016098755 A JP2016098755 A JP 2016098755A
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engine oil
turbocharger
engine
flow rate
determination method
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義久 岸本
Yoshihisa Kishimoto
義久 岸本
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Isuzu Motors Ltd
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Isuzu Motors Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an engine oil deterioration determination method with higher determination accuracy than ever before.SOLUTION: An engine oil deterioration determination method determines deterioration of engine oil through the steps to: acquire a flow rate of air sent to a turbocharger 4 with a flow rate sensor 20 installed in an intake passage 2 of a diesel engine; calculate a suction pressure ratio of the turbocharger 4 with an intake pressure sensor 21 installed in the intake passage 2 and an exhaust pressure sensor 22 installed in an exhaust passage 13; obtain a rotation speed of a rotary shaft 14 with a rotation sensor 23 installed on the turbocharger 4; and determine whether or not engine oil 19 is deteriorated on the basis of a predetermined map data showing a relation of viscosity of the engine oil 19 with the flow rate of the air, the suction pressure ratio and the rotation speed.SELECTED DRAWING: Figure 1

Description

本発明はエンジンオイルの劣化判定方法に関し、更に詳しくは、従来よりも判定精度を向上したエンジンオイルの劣化判定方法に関する。   The present invention relates to a method for determining deterioration of engine oil, and more particularly, to a method for determining deterioration of engine oil with improved determination accuracy compared to the conventional art.

通常のエンジンにおいては、ピストンやクランク軸などの摺動部品の摩耗及び焼き付け防止のため、潤滑油であるエンジンオイルが循環供給されている。このエンジンオイルは、酸化や熱により経時的に劣化して粘度が低下するため、潤滑・冷却性能の低下を招くことになる。そのため、車両が所定の走行距離に達したときには、エンジンオイルが劣化したと判定して、エンジンオイルの交換が行われる。   In an ordinary engine, engine oil, which is a lubricating oil, is circulated and supplied to prevent wear and seizure of sliding parts such as pistons and crankshafts. This engine oil deteriorates over time due to oxidation and heat, resulting in a decrease in viscosity, leading to a decrease in lubrication / cooling performance. Therefore, when the vehicle reaches a predetermined travel distance, it is determined that the engine oil has deteriorated, and the engine oil is replaced.

しかしながら、この劣化判定の指標である走行距離には、安全性等の観点から一定の裕度が設定されているため、エンジンオイルが無駄に消費されることになって、メンテナンスに係るコストが増加してしまうという問題がある。   However, since a certain margin is set for the travel distance, which is an indicator of this deterioration determination, from the viewpoint of safety and the like, the engine oil is wasted and the cost for maintenance increases. There is a problem of end up.

このような問題を解決するために、ディーゼルエンジンにおける煤の発生量に基づいて、エンジンオイルの劣化を判定する劣化判定方法が提案されている（例えば、特許文献１を参照）。   In order to solve such a problem, a deterioration determination method for determining deterioration of engine oil based on the amount of soot generated in a diesel engine has been proposed (see, for example, Patent Document 1).

しかしながら、上記の劣化判定方法では、煤の発生量を燃料噴射時期に基づいて算出しているため、判定精度を向上することが困難であるという問題がある。   However, the above-described deterioration determination method has a problem that it is difficult to improve the determination accuracy because the amount of soot generated is calculated based on the fuel injection timing.

特開２００２−２７６３２７号公報JP 2002-276327 A

本発明の目的は、従来よりも判定精度を向上したエンジンオイルの劣化判定方法を提供することにある。   An object of the present invention is to provide a method for determining deterioration of engine oil, which has improved determination accuracy as compared with the prior art.

上記の目的を達成する本発明のエンジンオイルの劣化判定方法は、ターボチャージャーを備えたエンジンにおけるエンジンオイルの劣化判定方法であって、前記ターボチャージャーへの空気流量を求めるステップと、前記ターボチャージャーの吸入圧力比を求めるステップと、前記ターボチャージャーの回転軸の回数数を求めるステップと、前記空気流量、吸入圧力及び回転数と前記エンジンオイルの粘性との関係を示す予め設定されたマップデータに基づいて該エンジンオイルの劣化の有無を判定するステップと、からなることを特徴とするものである。   An engine oil deterioration determination method of the present invention that achieves the above object is a method for determining deterioration of engine oil in an engine equipped with a turbocharger, comprising: obtaining an air flow rate to the turbocharger; Based on preset map data indicating the relationship between the step of obtaining the suction pressure ratio, the step of obtaining the number of rotations of the rotating shaft of the turbocharger, and the viscosity of the engine oil and the air flow rate, the suction pressure and the number of revolutions. And determining whether or not the engine oil has deteriorated.

本発明のエンジンオイルの劣化判定方法によれば、ターボチャージャーにおける空気流量、吸入圧力比及び回転軸の回転数と、エンジンオイルの粘性との関係を示す予め設定されたマップデータに基づいて劣化を有無を判定するようにしたので、従来よりも判定精度を向上したエンジンオイルの劣化判定方法を提供することができる。   According to the engine oil deterioration determination method of the present invention, deterioration is performed based on preset map data indicating the relationship between the air flow rate in the turbocharger, the suction pressure ratio and the rotational speed of the rotating shaft, and the viscosity of the engine oil. Since the presence / absence is determined, it is possible to provide an engine oil deterioration determination method with improved determination accuracy compared to the conventional method.

本発明の実施形態からなるエンジンオイルの劣化判定方法を適用するエンジンの構成図である。1 is a configuration diagram of an engine to which an engine oil deterioration determination method according to an embodiment of the present invention is applied. マップデータの例を示すグラフである。It is a graph which shows the example of map data.

以下に、本発明の実施の形態について、図面を参照して説明する。図１は、本発明の実施形態からなるエンジンオイルの劣化判定方法を行うディーゼルエンジンの構成図を示す。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a diesel engine that performs an engine oil deterioration determination method according to an embodiment of the present invention.

このディーゼルエンジンにおいては、吸入口１から吸気通路２へ吸入された空気Ａは、エアクリーナー３を通過してからターボチャージャー４のコンプレッサー５により圧縮され、インタークーラー６で冷却された後にインテークマニホールド７を経て、吸入空気８としてエンジン本体９に供給される。   In this diesel engine, the air A drawn into the intake passage 2 from the inlet 1 is compressed by the compressor 5 of the turbocharger 4 after passing through the air cleaner 3, cooled by the intercooler 6, and then taken into the intake manifold 7. Then, the intake air 8 is supplied to the engine body 9.

エンジン本体９に供給された吸入空気８は、複数の気筒１０内において噴射燃料と混合・燃焼した後に、燃焼ガス１１となってエキゾーストマニホールド１２から排気通路１３へ排気される。   The intake air 8 supplied to the engine body 9 is mixed and burned with the injected fuel in the plurality of cylinders 10, and then becomes combustion gas 11 and is exhausted from the exhaust manifold 12 to the exhaust passage 13.

排気通路１３へ排気された燃焼ガス１１は、コンプレッサー５と回転軸１４により同軸となっているタービン１５を回転駆動させた後に、図示しない排ガス浄化装置で浄化されてから、排出口１６から排ガスＧとなって大気中へ放出される。   The combustion gas 11 exhausted into the exhaust passage 13 is purified by an exhaust gas purification device (not shown) after rotating the turbine 15 that is coaxial with the compressor 5 and the rotary shaft 14, and then the exhaust gas G from the exhaust port 16. And released into the atmosphere.

ターボチャージャー４においてコンプレッサー５とタービン１５とを接続する回転軸１４の軸受１７には、エンジン本体９から延びる潤滑回路１８を通じて、エンジンオイル１９が循環供給されている。なお、図１では、エンジンオイル１９は、図示しないオイルポンプにより、反時計回りに強制循環している。   In the turbocharger 4, engine oil 19 is circulated and supplied to a bearing 17 of the rotary shaft 14 that connects the compressor 5 and the turbine 15 through a lubrication circuit 18 extending from the engine body 9. In FIG. 1, the engine oil 19 is forcibly circulated counterclockwise by an oil pump (not shown).

また、ターボチャージャー４の入口側の吸気通路２には、空気流量を測定する流量センサ２０と、ターボチャージャー４の吸入圧力を測定する吸気圧力センサ２１とが設置されている。また、ターボチャージャー４の出口側の排気通路１３には、ターボチャージャー４の吐出圧力を測定する排気圧力センサ２２が設置されている。更に、ターボチャージャー４には、回転軸１４の回転数を測定する回転センサ２３が取り付けられている。   A flow rate sensor 20 that measures the air flow rate and an intake pressure sensor 21 that measures the intake pressure of the turbocharger 4 are installed in the intake passage 2 on the inlet side of the turbocharger 4. An exhaust pressure sensor 22 that measures the discharge pressure of the turbocharger 4 is installed in the exhaust passage 13 on the outlet side of the turbocharger 4. Further, the turbocharger 4 is provided with a rotation sensor 23 for measuring the rotation speed of the rotating shaft 14.

これらの流量センサ２０、吸気圧力センサ２１、排気圧力センサ２２及び回転センサ２３は、ＥＣＵ２４に信号線（一点鎖線で示す）を通じて接続している。   The flow sensor 20, the intake pressure sensor 21, the exhaust pressure sensor 22, and the rotation sensor 23 are connected to the ECU 24 through a signal line (indicated by a one-dot chain line).

このようなディーゼルエンジンにおけるエンジンオイルの劣化判定方法を、ＥＣＵ２４の機能として以下に説明する。   A method for determining deterioration of engine oil in such a diesel engine will be described below as a function of the ECU 24.

ＥＣＵ２４は、流量センサ２０の信号値から、コンプレッサー５から流入する空気流量を求める。次に、吸気圧力センサ２１及び排気圧力センサ２２のそれぞれの信号値に基づいて、ターボチャージャー４における吸入圧力に対する吐出圧力の比である吸入圧力比を算出する。次に、回転センサ２３の信号値から、回転軸１４の回転数を求める。   The ECU 24 obtains the air flow rate flowing from the compressor 5 from the signal value of the flow rate sensor 20. Next, an intake pressure ratio, which is a ratio of the discharge pressure to the intake pressure in the turbocharger 4, is calculated based on the signal values of the intake pressure sensor 21 and the exhaust pressure sensor 22. Next, from the signal value of the rotation sensor 23, the number of rotations of the rotating shaft 14 is obtained.

そして、ＥＣＵ２４は、空気流量、吸入圧力比及び回転数と、エンジンオイル１９の粘性との関係を示すマップデータに基づいて、エンジンオイル１９の劣化の有無を判定する。   Then, the ECU 24 determines whether or not the engine oil 19 has deteriorated based on map data indicating the relationship between the air flow rate, the suction pressure ratio and the rotation speed, and the viscosity of the engine oil 19.

このマップデータの例を図２に示す。この図２における斜線を施した部分が、エンジンオイル１９において粘性の低下による劣化が生じたと判定する領域である。   An example of this map data is shown in FIG. The hatched portion in FIG. 2 is a region where it is determined that the engine oil 19 has deteriorated due to a decrease in viscosity.

このようにエンジンオイル１９の劣化を判定するようにしたので、従来よりも判定精度を向上することができる。   Since the deterioration of the engine oil 19 is determined in this way, the determination accuracy can be improved as compared with the conventional case.

２ 吸気通路
４ ターボチャージャー
５ コンプレッサ
９ エンジン本体
１３ 排気通路
１４ 回転軸
１５ タービン
１７ 軸受
１８ 潤滑回路
１９ エンジンオイル
２０ 流量センサ
２１ 吸気圧力センサ
２２ 排気圧力センサ
２３ 回転センサ
２４ ＥＣＵ 2 Intake passage 4 Turbocharger 5 Compressor 9 Engine body 13 Exhaust passage 14 Rotating shaft 15 Turbine 17 Bearing 18 Lubrication circuit 19 Engine oil 20 Flow rate sensor 21 Intake pressure sensor 22 Exhaust pressure sensor 23 Rotation sensor 24 ECU

Claims (2)

ターボチャージャーを備えたエンジンにおけるエンジンオイルの劣化判定方法であって、
前記ターボチャージャーへの空気流量を求めるステップと、前記ターボチャージャーの吸入圧力比を求めるステップと、前記ターボチャージャーの回転軸の回数数を求めるステップと、前記空気流量、吸入圧力及び回転数と前記エンジンオイルの粘性との関係を示す予め設定されたマップデータに基づいて該エンジンオイルの劣化の有無を判定するステップと、からなることを特徴とするエンジンオイルの劣化判定方法。 A method for judging deterioration of engine oil in an engine equipped with a turbocharger,
A step of obtaining an air flow rate to the turbocharger, a step of obtaining a suction pressure ratio of the turbocharger, a step of obtaining the number of rotations of the turbocharger, the air flow rate, the suction pressure and the rotational speed, and the engine And determining whether or not the engine oil has deteriorated based on preset map data indicating the relationship with the viscosity of the oil. 前記エンジンがディーゼルエンジンである請求項１に記載のエンジンオイルの劣化判定方法。   The engine oil deterioration determination method according to claim 1, wherein the engine is a diesel engine.
JP2014237647A 2014-11-25 2014-11-25 Engine oil deterioration determination method Pending JP2016098755A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112798469A (en) * 2021-01-19 2021-05-14 潍柴动力股份有限公司 Engine oil viscosity detection method and engine

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JP2004257315A (en) * 2003-02-26 2004-09-16 Toyota Motor Corp Status detector of internal combustion engine
US20080236266A1 (en) * 2007-03-02 2008-10-02 Detroit Diesel Corporation Method of diagnosing turbochargers for internal combustion engines
JP2009203916A (en) * 2008-02-28 2009-09-10 Honda Motor Co Ltd Apparatus for determining degradation of oil
JP2010084709A (en) * 2008-10-01 2010-04-15 Toyota Motor Corp Oil degradation determining device for internal combustion engine
JP2013019319A (en) * 2011-07-11 2013-01-31 Toyota Motor Corp Failure determining device for turbocharger

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003328841A (en) * 2002-05-15 2003-11-19 Caterpillar Inc Diagnostic system for turbocharged engine
JP2004257315A (en) * 2003-02-26 2004-09-16 Toyota Motor Corp Status detector of internal combustion engine
US20080236266A1 (en) * 2007-03-02 2008-10-02 Detroit Diesel Corporation Method of diagnosing turbochargers for internal combustion engines
JP2009203916A (en) * 2008-02-28 2009-09-10 Honda Motor Co Ltd Apparatus for determining degradation of oil
JP2010084709A (en) * 2008-10-01 2010-04-15 Toyota Motor Corp Oil degradation determining device for internal combustion engine
JP2013019319A (en) * 2011-07-11 2013-01-31 Toyota Motor Corp Failure determining device for turbocharger

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112798469A (en) * 2021-01-19 2021-05-14 潍柴动力股份有限公司 Engine oil viscosity detection method and engine
CN112798469B (en) * 2021-01-19 2023-05-23 潍柴动力股份有限公司 Engine oil viscosity detection method and engine

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