WO2013073456A1 - Egr cooler diagnosis system - Google Patents
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- WO2013073456A1 WO2013073456A1 PCT/JP2012/079071 JP2012079071W WO2013073456A1 WO 2013073456 A1 WO2013073456 A1 WO 2013073456A1 JP 2012079071 W JP2012079071 W JP 2012079071W WO 2013073456 A1 WO2013073456 A1 WO 2013073456A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/33—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage controlling the temperature of the recirculated gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
- F02M26/25—Layout, e.g. schematics with coolers having bypasses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
- F02D2021/083—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine controlling exhaust gas recirculation electronically
Abstract
This EGR cooler diagnosis system, which diagnoses the cooling efficiency of the EGR cooler (11) of a diesel engine (1), is configured from: a cylinder intake pressure sensor (15) installed at an intake manifold (7); an intercooler exit temperature sensor (16) installed at the exit of an intercooler (6); an intaken-air-quantity sensor (17) installed at the vicinity of the intake opening (2) of an intake tube (3); and a processing means (21) and an EGR cooler exit temperature sensor installed at the exit of the EGR cooler (11). The processing means (21) calculates a diagnosis value (ΔT) using a group of formulae that use the measurement values of the abovementioned four sensors (15-18) and the like, and diagnoses the cooling efficiency of the EGR cooler (11) by comparing the diagnosis value (ΔT) with a predetermined value.
Description
本発明はEGRクーラー診断システムに関し、更に詳しくは、EGRクーラーの冷却効率を低コストで診断することができるEGRクーラー診断システムに関する。
The present invention relates to an EGR cooler diagnostic system, and more particularly to an EGR cooler diagnostic system that can diagnose the cooling efficiency of an EGR cooler at low cost.
ディーゼルエンジンの排気ガス中の窒素酸化物(NOx:Nitrogen Oxide)を低減することを目的として、排気ガスの一部を吸気に還流させることで、燃焼温度を低く抑えてNOxの生成を抑制する排気ガス再循環(EGR:Exhaust Gas Recirculation)が広く実用化されている(例えば、日本出願の特開2001-41110号公報を参照)。
Exhaust gas that lowers the combustion temperature and suppresses the generation of NOx by recirculating part of the exhaust gas to the intake air for the purpose of reducing nitrogen oxides (NOx: Nitrogen Oxide) in the exhaust gas of diesel engines Gas recirculation (EGR: Exhaust Gas Recirculation) has been widely put into practical use (for example, see Japanese Patent Application Laid-Open No. 2001-41110).
通常、EGRは、ディーゼルエンジンの排気管から吸気管へ接続するEGR通路に設けたEGR弁で、排気ガスの分流(EGRガス)量を調整することにより行われる。このとき、EGRガスをそのまま吸気側に循環させると、高温で膨張しているEGRガスがインテークマニホールドに供給されるので、吸気時に気筒内でEGRガスが占める割合が増加し、その分だけ空気量が減少してしまう。その結果、気筒内での燃焼状態が悪化して、排気ガス中の不純物が増加してしまうことになる。そのため、EGR通路の途中に水冷式のEGRクーラーを設置して、EGRガスを冷却して体積を減少させてから、インテークマニホールドに供給することが行われている。
Ordinarily, EGR is performed by adjusting the amount of exhaust gas diversion (EGR gas) with an EGR valve provided in an EGR passage connected from an exhaust pipe of a diesel engine to an intake pipe. At this time, if the EGR gas is circulated to the intake side as it is, the EGR gas expanded at a high temperature is supplied to the intake manifold, so that the ratio of the EGR gas in the cylinder at the time of intake increases, and the amount of air increases accordingly. Will decrease. As a result, the combustion state in the cylinder deteriorates and impurities in the exhaust gas increase. For this reason, a water-cooled EGR cooler is installed in the middle of the EGR passage, the EGR gas is cooled to reduce the volume, and then supplied to the intake manifold.
一方、EGRガスがEGRクーラーにおいて過度に冷却されると、エンジンの暖機が遅れたり、EGRガス中の水分が結露して気筒内での燃焼不良やエンジンの耐久性低下などを招くおそれがある。このようなことから、EGRクーラーの冷却効率を診断することが重要になっている。
On the other hand, if the EGR gas is excessively cooled in the EGR cooler, the warm-up of the engine may be delayed, or moisture in the EGR gas may condense, resulting in in-cylinder combustion failure or engine durability deterioration. . For this reason, it is important to diagnose the cooling efficiency of the EGR cooler.
従来より、EGRクーラーの冷却効率の診断は、EGRクーラーの出入口にそれぞれ温度センサを設置して、それらの測定値の偏差をモニタすることにより実施されている。しかし、このような方法では、新たに複数台の温度センサを追加することが必要となるため、製造コストの増加を招くという問題があった。また、EGRクーラーの温度センサの台数が複数になると、センサ間の位置関係や検出遅れなどに伴う補正が必要となるため、診断精度が低下するという問題もあった。
Conventionally, the diagnosis of the cooling efficiency of an EGR cooler has been carried out by installing temperature sensors at the entrances and exits of the EGR cooler and monitoring deviations in the measured values. However, in such a method, since it is necessary to newly add a plurality of temperature sensors, there is a problem in that the manufacturing cost is increased. In addition, when there are a plurality of temperature sensors in the EGR cooler, correction associated with the positional relationship between the sensors, detection delay, and the like is necessary, which causes a problem that diagnostic accuracy is lowered.
本発明の目的は、EGRクーラーの冷却効率を低コストでかつ精度良く診断することができるEGRクーラー診断システムを提供することにある。
An object of the present invention is to provide an EGR cooler diagnostic system that can accurately diagnose the cooling efficiency of an EGR cooler at low cost.
上記の目的を達成する本発明のEGRクーラー診断システムは、ディーゼルエンジンのEGRクーラーの冷却効率を診断するEGRクーラー診断システムであって、前記ディーゼルエンジンのインテークマニホールドに設置されたシリンダー吸気圧力センサと、前記インテークマニホールドに接続するインタークーラーの出口に設置されたインタークーラー出口温度センサと、前記インタークーラーに接続する吸気管の吸入口近傍に設置された吸入空気量センサと、EGRクーラーの出口に設置されたEGRクーラー出口温度センサと、それら4台のセンサの測定値を処理する処理手段とを備え、前記処理手段は、前記シリンダー吸気圧力センサの測定値P2、吸入空気量センサーの測定値m1、インタークーラー出口温度センサの測定値T1及びEGRクーラー出口温度センサの測定値T2を用いて以下の(1)~(5)式により診断値ΔTを算出し、前記診断値ΔTが所定値未満であるときに前記EGRクーラーの冷却効率が劣化していると診断することを特徴とするものである。
The EGR cooler diagnostic system of the present invention that achieves the above object is an EGR cooler diagnostic system that diagnoses the cooling efficiency of an EGR cooler of a diesel engine, and a cylinder intake pressure sensor installed in an intake manifold of the diesel engine, An intercooler outlet temperature sensor installed at the outlet of the intercooler connected to the intake manifold, an intake air amount sensor installed near the inlet of the intake pipe connected to the intercooler, and an EGR cooler installed at the outlet of the EGR cooler An outlet temperature sensor, and processing means for processing measured values of the four sensors, the processing means including a measured value P2 of the cylinder intake pressure sensor, a measured value m1 of the intake air amount sensor, an intercooler outlet temperature sensor Measured value T And the diagnosis value ΔT is calculated by the following formulas (1) to (5) using the measured value T2 of the EGR cooler outlet temperature sensor, and when the diagnosis value ΔT is less than a predetermined value, the cooling efficiency of the EGR cooler is It is characterized by diagnosing that it has deteriorated.
The EGR cooler diagnostic system of the present invention that achieves the above object is an EGR cooler diagnostic system that diagnoses the cooling efficiency of an EGR cooler of a diesel engine, and a cylinder intake pressure sensor installed in an intake manifold of the diesel engine, An intercooler outlet temperature sensor installed at the outlet of the intercooler connected to the intake manifold, an intake air amount sensor installed near the inlet of the intake pipe connected to the intercooler, and an EGR cooler installed at the outlet of the EGR cooler An outlet temperature sensor, and processing means for processing measured values of the four sensors, the processing means including a measured value P2 of the cylinder intake pressure sensor, a measured value m1 of the intake air amount sensor, an intercooler outlet temperature sensor Measured value T And the diagnosis value ΔT is calculated by the following formulas (1) to (5) using the measured value T2 of the EGR cooler outlet temperature sensor, and when the diagnosis value ΔT is less than a predetermined value, the cooling efficiency of the EGR cooler is It is characterized by diagnosing that it has deteriorated.
但し、T3:EGRクーラー入口温度計算値、T4:インテークマニホールド温度計算値、m2:EGRクーラー出口ガス質量流量計算値、m3:インテークマニホールドガス質量流量計算値、n:ディーゼルエンジンのシリンダー数、R:空気のガス定数、V:ディーゼルエンジンの排気量、η:体積効率、dT:燃焼によるガスの温度上昇をそれぞれ示す。
However, T3: EGR cooler inlet temperature calculation value, T4: Intake manifold temperature calculation value, m2: EGR cooler outlet gas mass flow rate calculation value, m3: Intake manifold gas mass flow rate calculation value, n: Number of cylinders of diesel engine, R: Gas constant of air, V: displacement of diesel engine, η: volumetric efficiency, dT: gas temperature increase due to combustion, respectively.
EGRクーラーの冷却効率を診断するための所定値としては150~200℃の範囲の値を用いることが望ましい。
It is desirable to use a value in the range of 150 to 200 ° C. as the predetermined value for diagnosing the cooling efficiency of the EGR cooler.
また、処理手段がEGRクーラーの冷却効率の診断結果を通知する通知手段を備えることで、車両の運転者などにEGRクーラーの冷却効率の劣化を早期かつ確実に伝達することができる。
Also, since the processing means includes a notification means for notifying the diagnosis result of the cooling efficiency of the EGR cooler, the deterioration of the cooling efficiency of the EGR cooler can be transmitted to the vehicle driver and the like early and reliably.
本発明のEGRクーラー診断システムは、一般の内燃機関に好適に用いられる。
The EGR cooler diagnostic system of the present invention is suitably used for general internal combustion engines.
本発明のEGRクーラー診断システムによれば、EGRクーラーの出口に新たに1台の温度センサを設置するだけでよいので、従来よりも温度センサの台数が少なくて済むため、EGRクーラーの冷却効率を低コスト診断することができる。また、温度センサが1台であるので、測定値の補正等が不要となるため診断精度を向上することができる。
According to the EGR cooler diagnostic system of the present invention, since only one temperature sensor needs to be installed at the outlet of the EGR cooler, the number of temperature sensors can be reduced as compared with the conventional one. A low-cost diagnosis can be made. In addition, since there is only one temperature sensor, it is not necessary to correct the measurement value, so that the diagnostic accuracy can be improved.
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。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
図1は、本発明の実施形態からなるEGRクーラー診断システムを示す。
FIG. 1 shows an EGR cooler diagnostic system according to an embodiment of the present invention.
このEGRクーラー診断システムが装備されるディーゼルエンジン1では、吸入口2から吸気管3内へ吸入された空気は、エアクリーナー4を通過してからターボチャージャー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4つの気筒8のそれぞれへ供給される。そして、各気筒8から燃焼ガスとなって排気管9へ排気されるが、その一部はインタークーラー6の下流側の吸気管3に接続するEGR通路10にEGRガスとなって分流する。EGR通路10には、水冷式のEGRクーラー11と、EGRガスの流量を調整するEGR弁12とが、排気管9側から順に配置されている。また、EGRクーラー11によるEGRガスの過冷却を防止するために、EGRクーラー11の出口と上流側の排気管9とを接続する排気戻し通路13が設けられている。EGR通路10に分流しなかった排気ガスは、ターボチャージャー5を回転駆動させた後に、排出口14から外部へ放出される。
In the diesel engine 1 equipped with this EGR cooler diagnostic system, the air drawn into the intake pipe 3 from the inlet 2 is compressed by the turbocharger 5 after passing through the air cleaner 4 and cooled by the intercooler 6. Thereafter, the gas is supplied to each of the four cylinders 8 via the intake manifold 7. Then, the combustion gas from each cylinder 8 is exhausted to the exhaust pipe 9, but a part of the combustion gas is diverted as EGR gas to the EGR passage 10 connected to the intake pipe 3 on the downstream side of the intercooler 6. In the EGR passage 10, a water-cooled EGR cooler 11 and an EGR valve 12 that adjusts the flow rate of EGR gas are arranged in this order from the exhaust pipe 9 side. In addition, in order to prevent the EGR gas from being overcooled by the EGR cooler 11, an exhaust return passage 13 that connects the outlet of the EGR cooler 11 and the upstream exhaust pipe 9 is provided. Exhaust gas that has not been diverted to the EGR passage 10 is discharged to the outside from the discharge port 14 after the turbocharger 5 is rotationally driven.
本発明のEGRクーラー診断システムは、インテークマニホールド7に設置されたシリンダー吸気圧力センサ15と、インタークーラー6の出口に設置されたインタークーラー出口温度センサ16と、エアクリーナー4とターボチャージャー5との間の吸気管3に設置された吸入空気量センサ17と、EGRクーラー11の出口に設置されたEGRクーラー出口温度センサ18と、それら4台のセンサ15~18及びECU(Engine Control Unit)19に、それぞれ信号線20a~20eを通じて接続する処理手段21とから構成されている。
The EGR cooler diagnostic system of the present invention includes a cylinder intake pressure sensor 15 installed in the intake manifold 7, an intercooler outlet temperature sensor 16 installed at the outlet of the intercooler 6, and intake air between the air cleaner 4 and the turbocharger 5. The intake air amount sensor 17 installed in the pipe 3, the EGR cooler outlet temperature sensor 18 installed at the outlet of the EGR cooler 11, the four sensors 15 to 18 and the ECU (Engine Control Unit) 19 respectively And processing means 21 connected through lines 20a to 20e.
シリンダー吸気圧力センサ15は、インテークマニホールド7内の空気の圧力を測定する。また、吸入空気量センサ17は、吸入口2から吸入された空気の質量流量を測定する。なお、シリンダー吸気圧力センサ15、インタークーラー出口温度センサ16及び吸入空気量センサ17は、ディーゼルエンジン1の運転状態を示す測定値をECU19に提供するために、従来から設置されているものである。
The cylinder intake pressure sensor 15 measures the pressure of air in the intake manifold 7. The intake air amount sensor 17 measures the mass flow rate of air sucked from the suction port 2. The cylinder intake pressure sensor 15, the intercooler outlet temperature sensor 16, and the intake air amount sensor 17 are conventionally installed in order to provide the ECU 19 with measured values indicating the operation state of the diesel engine 1.
処理手段21は、記憶部を備えたCPU(Central Processing Unit)から構成され、信号線20a~20dを通じて4台のセンサ15~18から測定値を取得する。なお、図1の例では、処理手段21とECU19とを別体にしているが、処理手段21の機能をECU19に持たせることで一体化するようにしてもよい。
The processing means 21 is composed of a CPU (Central Processing Unit) equipped with a storage unit, and acquires measurement values from the four sensors 15 to 18 through signal lines 20a to 20d. In the example of FIG. 1, the processing unit 21 and the ECU 19 are separated from each other, but the processing unit 21 may be integrated by providing the ECU 19 with the function of the processing unit 21.
このような構成を有するEGRクーラー診断システムの機能を、図2に示すフロー図を基に以下に説明する。
The function of the EGR cooler diagnostic system having such a configuration will be described below based on the flowchart shown in FIG.
処理手段21は、ディーゼルエンジン1の運転条件が成立しているか否かをECU19から送られる信号で確認(S10)する。なお、運転条件が成立する場合としては、基本的にはEGRクーラー11のオン時、つまり暖機後のアイドル運転時以外の状態などが例示される。
The processing means 21 confirms whether or not the operating condition of the diesel engine 1 is established by a signal sent from the ECU 19 (S10). As a case where the operating condition is satisfied, basically, a state other than the time when the EGR cooler 11 is turned on, that is, during the idling operation after warming up is exemplified.
次に、運転条件が成立している場合には、シリンダー吸気圧力センサ15の測定値P2、インタークーラー出口温度センサ16の測定値T1、吸入空気量センサー17の測定値m1及びEGRクーラー出口温度センサ18の測定値T2を取得する(S20)。それら取得した測定値P2、m1、T1、T2を用いて、以下に示す(1)~(5)式によりEGRクーラーの冷却効率の診断値ΔTを算出する(S30)。
Next, when the operating condition is satisfied, the measured value P2 of the cylinderintake pressure sensor 15, the measured value T1 of the intercooler outlet temperature sensor 16, the measured value m1 of the intake air amount sensor 17, and the EGR cooler outlet temperature sensor 18 The measured value T2 is acquired (S20). Using these acquired measured values P2, m1, T1, and T2, a diagnostic value ΔT of the cooling efficiency of the EGR cooler is calculated by the following equations (1) to (5) (S30).
Next, when the operating condition is satisfied, the measured value P2 of the cylinder
但し、T3はEGRクーラー11の入口温度の計算値を、T4はインテークマニホールド7の温度の計算値を、m2はEGRクーラー11の出口ガス質量流量の計算値を、m3はインテークマニホールド7のガス質量流量の計算値をそれぞれ示す。また、定数として、nはディーゼルエンジン1のシリンダー数(気筒8の数)を、Rは空気のガス定数を、Vはディーゼルエンジン1の排気量をそれぞれ示す。更に、ηは体積効率を、dTは燃焼によるガスの温度上昇をそれぞれ示すが、それらは機器の特性を表すマップデータから得ることができる。例えば、dTは、ディーゼルエンジン1の種類毎に設定された燃料噴射量とエンジン回転数とからなるマップデータから得ることができる。また、通常のηの値は70~100%となる。
However, T3 is the calculated value of the inlet temperature of the EGR cooler 11, T4 is the calculated value of the temperature of the intake manifold 7, m2 is the calculated value of the outlet gas mass flow rate of the EGR cooler 11, and m3 is the gas mass of the intake manifold 7. The calculated values of flow rate are shown respectively. As constants, n represents the number of cylinders of the diesel engine 1 (the number of cylinders 8), R represents the gas constant of air, and V represents the displacement of the diesel engine 1. Furthermore, η indicates volumetric efficiency, and dT indicates gas temperature increase due to combustion, which can be obtained from map data representing the characteristics of the equipment. For example, dT can be obtained from map data including a fuel injection amount set for each type of diesel engine 1 and an engine speed. The normal value of η is 70 to 100%.
そして、診断値ΔTと所定値とを比較して(S40)、診断値ΔTが所定値未満である場合には、EGRクーラー11の冷却効率が劣化していると診断し(S50)、反対に所定値以上の場合には、EGRクーラー11の冷却効率が正常であると診断する(S60)。
Then, the diagnosis value ΔT is compared with a predetermined value (S40), and if the diagnosis value ΔT is less than the predetermined value, it is diagnosed that the cooling efficiency of the EGR cooler 11 is deteriorated (S50), on the contrary. If it is equal to or greater than the predetermined value, it is diagnosed that the cooling efficiency of the EGR cooler 11 is normal (S60).
以上のように、新たにEGRクーラー11の出口に温度センサを1台設置するだけよいので、従来のように2台設置する場合に比べてEGRクーラー11の冷却効率を低コストで診断することができる。また、EGRクーラー11の温度センサが1台で済むので、測定値の補正等が不要となるため診断精度を向上することができる。
As described above, it is only necessary to newly install one temperature sensor at the outlet of the EGR cooler 11, so that the cooling efficiency of the EGR cooler 11 can be diagnosed at a lower cost compared to the case where two are installed as in the prior art. it can. In addition, since only one temperature sensor of the EGR cooler 11 is required, correction of the measurement value or the like is not necessary, and diagnostic accuracy can be improved.
EGRクーラー11の冷却効率の診断に用いる所定値は、ディーゼルエンジン1のサイズや性能により変化するが、一般的な大型車両を対象にした場合には、約150~200℃の範囲の値を用いることが望ましい。
The predetermined value used for diagnosing the cooling efficiency of the EGR cooler 11 varies depending on the size and performance of the diesel engine 1, but when a general large vehicle is targeted, a value in a range of about 150 to 200 ° C. is used. It is desirable.
図3は、本発明の実施形態からなるEGRクーラー診断システムを示す。
FIG. 3 shows an EGR cooler diagnostic system according to an embodiment of the present invention.
このEGRクーラー診断システムは、EGRクーラー11の冷却効率の診断結果を通知する通知手段22を、信号線20fを通じて処理手段21に接続したものである。通知手段22としては、ディーゼルエンジン1を搭載する車両の運転席などに設置されたモニタや警報器などが例示される。
In this EGR cooler diagnostic system, notification means 22 for notifying the diagnosis result of the cooling efficiency of the EGR cooler 11 is connected to the processing means 21 through a signal line 20f. Examples of the notification means 22 include a monitor and an alarm device installed in a driver's seat of a vehicle on which the diesel engine 1 is mounted.
このように通知手段22を設けることにより、EGRクーラー11の冷却効率の劣化を、車両の運転者などに早期かつ確実に伝達することができる。
By providing the notification means 22 in this way, the deterioration of the cooling efficiency of the EGR cooler 11 can be transmitted early and reliably to the driver of the vehicle.
本発明のEGRクーラー診断システムの用途は、上述したような車両のディーゼルエンジン1に限るものではなく、その他一般の内燃機関にも適用することができる。
The use of the EGR cooler diagnostic system of the present invention is not limited to the vehicle diesel engine 1 as described above, but can be applied to other general internal combustion engines.
1 ディーゼルエンジン
2 吸入口
3 吸気管
4 エアクリーナー
5 ターボチャージャー
6 インタークーラー
7 インテークマニホールド
8 気筒
9 排気管
10 EGR通路
11 EGRクーラー
12 EGR弁
13 排気戻し通路
14 排出口
15 シリンダ吸気圧力センサ
16 インタークーラー出口温度センサ
17 吸入空気量センサ
18 EGRクーラー出口温度センサ
19 ECU
20a~20f 信号線
21 処理手段
22 通知手段 DESCRIPTION OFSYMBOLS 1 Diesel engine 2 Intake port 3 Intake pipe 4 Air cleaner 5 Turbocharger 6 Intercooler 7 Intake manifold 8 Cylinder 9 Exhaust pipe 10 EGR passage 11 EGR cooler 12 EGR valve 13 Exhaust return passage 14 Outlet 15 Cylinder intake pressure sensor 16 Intercooler exit temperature Sensor 17 Intake air amount sensor 18 EGR cooler outlet temperature sensor 19 ECU
20a to20f Signal line 21 Processing means 22 Notification means
2 吸入口
3 吸気管
4 エアクリーナー
5 ターボチャージャー
6 インタークーラー
7 インテークマニホールド
8 気筒
9 排気管
10 EGR通路
11 EGRクーラー
12 EGR弁
13 排気戻し通路
14 排出口
15 シリンダ吸気圧力センサ
16 インタークーラー出口温度センサ
17 吸入空気量センサ
18 EGRクーラー出口温度センサ
19 ECU
20a~20f 信号線
21 処理手段
22 通知手段 DESCRIPTION OF
20a to
Claims (4)
- ディーゼルエンジンのEGRクーラーの冷却効率を診断するEGRクーラー診断システムであって、
前記ディーゼルエンジンのインテークマニホールドに設置されたシリンダー吸気圧力センサと、前記インテークマニホールドに接続するインタークーラーの出口に設置されたインタークーラー出口温度センサと、前記インタークーラーに接続する吸気管の吸入口近傍に設置された吸入空気量センサと、EGRクーラーの出口に設置されたEGRクーラー出口温度センサと、それら4台のセンサの測定値を処理する処理手段とを備え、
前記処理手段は、前記シリンダー吸気圧力センサの測定値P2、吸入空気量センサーの測定値m1、インタークーラー出口温度センサの測定値T1及びEGRクーラー出口温度センサの測定値T2を用いて以下の(1)~(5)式により診断値ΔTを算出し、
前記診断値ΔTが所定値未満であるときに前記EGRクーラーの冷却効率が劣化していると診断することを特徴とするEGRクーラー診断システム。
但し、T3:EGRクーラー入口温度計算値、T4:インテークマニホールド温度計算値、m2:EGRクーラー出口ガス質量流量計算値、m3:インテークマニホールドガス質量流量計算値、n:ディーゼルエンジンのシリンダー数、R:空気のガス定数、V:ディーゼルエンジンの排気量、η:体積効率、dT:燃焼によるガスの温度上昇をそれぞれ示す。 An EGR cooler diagnostic system for diagnosing the cooling efficiency of an EGR cooler of a diesel engine,
The cylinder intake pressure sensor installed in the intake manifold of the diesel engine, the intercooler outlet temperature sensor installed at the outlet of the intercooler connected to the intake manifold, and installed near the intake port of the intake pipe connected to the intercooler An intake air amount sensor, an EGR cooler outlet temperature sensor installed at the outlet of the EGR cooler, and processing means for processing measured values of these four sensors,
The processing means uses the measured value P2 of the cylinder intake pressure sensor, the measured value m1 of the intake air amount sensor, the measured value T1 of the intercooler outlet temperature sensor, and the measured value T2 of the EGR cooler outlet temperature sensor as follows (1) The diagnostic value ΔT is calculated by the formula (5),
An EGR cooler diagnosis system that diagnoses that the cooling efficiency of the EGR cooler is deteriorated when the diagnosis value ΔT is less than a predetermined value.
However, T3: EGR cooler inlet temperature calculation value, T4: intake manifold temperature calculation value, m2: EGR cooler outlet gas mass flow calculation value, m3: intake manifold gas mass flow calculation value, n: number of cylinders of diesel engine, R: The gas constant of air, V: displacement of the diesel engine, η: volumetric efficiency, dT: gas temperature increase due to combustion, respectively. - 前記所定値が150~200℃である請求項1に記載のEGRクーラー診断システム。 The EGR cooler diagnostic system according to claim 1, wherein the predetermined value is 150 to 200 ° C.
- 前記処理手段が前記EGRクーラーの冷却効率の診断結果を通知する通知手段を備える請求項1又は2に記載のEGRクーラー診断システム。 The EGR cooler diagnosis system according to claim 1 or 2, wherein the processing means includes notification means for notifying a diagnosis result of the cooling efficiency of the EGR cooler.
- 請求項1~3のいずれかに記載のEGRクーラー診断システムを搭載したことを特徴とする内燃機関。 An internal combustion engine equipped with the EGR cooler diagnostic system according to any one of claims 1 to 3.
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JP2003336549A (en) * | 2002-05-20 | 2003-11-28 | Denso Corp | Egr device for internal combustion engine |
JP2004211560A (en) * | 2002-12-27 | 2004-07-29 | Denso Corp | Control apparatus for internal combustion engine |
JP2008144609A (en) * | 2006-12-06 | 2008-06-26 | Isuzu Motors Ltd | Failure determining method of egr system and failure determining system of egr system |
JP2011038440A (en) * | 2009-08-07 | 2011-02-24 | Isuzu Motors Ltd | Egr device |
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CN114459765A (en) * | 2022-01-24 | 2022-05-10 | 东风汽车股份有限公司 | Method for monitoring cooling efficiency of radiator |
CN114459765B (en) * | 2022-01-24 | 2023-09-29 | 东风汽车股份有限公司 | Radiator cooling efficiency monitoring method |
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