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WO2013073457A1 - Intercooler diagnosis system - Google Patents

Intercooler diagnosis system Download PDF

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Publication number
WO2013073457A1
WO2013073457A1 PCT/JP2012/079072 JP2012079072W WO2013073457A1 WO 2013073457 A1 WO2013073457 A1 WO 2013073457A1 JP 2012079072 W JP2012079072 W JP 2012079072W WO 2013073457 A1 WO2013073457 A1 WO 2013073457A1
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WO
WIPO (PCT)
Prior art keywords
intercooler
intake
cooling efficiency
temperature sensor
pressure sensor
Prior art date
Application number
PCT/JP2012/079072
Other languages
French (fr)
Japanese (ja)
Inventor
英和 藤江
哲史 塙
Original Assignee
いすゞ自動車株式会社
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Publication date
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Publication of WO2013073457A1 publication Critical patent/WO2013073457A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • 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
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0406—Intake manifold pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0414—Air temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
    • F02D2200/703—Atmospheric pressure
    • 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
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to an intercooler diagnostic system, and more particularly to an intercooler diagnostic system that can diagnose the cooling efficiency of the intercooler at low cost.
  • the intercooler is required not only to increase the output of the diesel engine described above, but also to have high cooling efficiency not only from legal requirements that stipulate that energy saving should be promoted by using an appropriate heat exchanger. It has been. Therefore, it is important to diagnose the cooling efficiency of the intercooler.
  • diagnosis of the cooling efficiency of the intercooler has been carried out by installing temperature sensors at the entrance and exit of the intercooler and comparing the difference between the measured values with the temperature rise in the turbocharger.
  • temperature sensors since it is necessary to newly add a plurality of temperature sensors, there is a problem in that the manufacturing cost is increased.
  • An object of the present invention is to provide an intercooler diagnostic system that can diagnose the cooling efficiency of an intercooler at low cost.
  • An intercooler diagnostic system of the present invention that achieves the above object is an intercooler diagnostic system for diagnosing the cooling efficiency of a diesel engine intercooler, and includes a cylinder intake pressure sensor and an intake manifold temperature sensor installed in an intake manifold of the diesel engine.
  • An intake air temperature sensor installed in the vicinity of the intake port of the intake pipe connected to the intake manifold, an atmospheric pressure sensor for measuring the atmospheric pressure, and an EGR valve for processing the measured values of these sensors and opening and closing the EGR passage
  • processing means for controlling, after the EGR valve is closed, the processing means measures the measured value P2 of the cylinder intake pressure sensor, the measured value T4 of the intake manifold temperature sensor, the measured value T1 of the intake temperature sensor, and the atmospheric pressure sensor.
  • the cooling efficiency ⁇ c of the intercooler is calculated by the following formulas (1) to (3), and it is diagnosed that the cooling efficiency of the intercooler is deteriorated when the cooling efficiency ⁇ c is less than a predetermined value. Is.
  • T3 Intercooler outlet temperature calculation value
  • ⁇ specific heat ratio
  • ⁇ compressor efficiency
  • the processing means includes notification means for notifying the diagnosis result of the cooling efficiency of the intercooler, the deterioration of the cooling efficiency of the intercooler can be transmitted to the driver of the vehicle at an early stage and with certainty.
  • the intercooler diagnostic system of the present invention is suitably used for general internal combustion engines.
  • the intercooler diagnostic system of the present invention it is only necessary to use a conventional sensor without newly installing a temperature sensor at the entrance / exit of the intercooler, so that the cooling efficiency of the intercooler can be diagnosed at low cost.
  • FIG. 1 is a configuration diagram of an intercooler diagnostic system according to an embodiment of the present invention.
  • FIG. 2 is a flowchart showing the processing contents of the processing means.
  • FIG. 3 is a configuration diagram of an intercooler diagnostic system according to another embodiment of the present invention.
  • FIG. 1 shows an intercooler diagnostic system according to an embodiment of the present invention.
  • 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. It 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.
  • 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.
  • 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.
  • the intercooler diagnostic system of the present invention includes a cylinder intake pressure sensor 15 and an intake manifold temperature sensor 16 installed in the intake manifold 7, and an intake air temperature sensor 17 installed in the intake pipe 3 between the air cleaner 4 and the turbocharger 5. And an atmospheric pressure sensor 18 for measuring the atmospheric pressure, and processing means 21 connected to the four sensors 15 to 18, the EGR valve 12 and the ECU (Engine Control Unit) 19 through signal lines 20a to 20f, respectively. Has been.
  • the cylinder intake pressure sensor 15 and the intake manifold temperature sensor 16 measure the pressure and temperature of the air in the intake manifold 7, respectively.
  • the intake air temperature sensor 17 measures the temperature of the air that is drawn from the intake port 2 and supplied to the turbocharger 5.
  • the atmospheric pressure sensor 18 is installed in the vicinity of the diesel engine 1 and measures the atmospheric pressure around the diesel engine 1. These four sensors 15 to 18 are conventionally installed in order to provide the ECU 19 with measured values indicating the operating state of the diesel engine 1.
  • the processing means 21 is composed of a CPU (Central Processing Unit) equipped with a storage unit, acquires measurement values from the four sensors 15 to 18 through the signal lines 20a to 20d, and opens the EGR valve 12 through the signal line 20e. Control the degree.
  • 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.
  • the processing means 21 closes the EGR valve 12 and turns off the function of the EGR cooler 11 (S20). Then, the measured value P2 of the cylinder intake pressure sensor 15, the measured value T4 of the intake manifold temperature sensor 16, the measured value T1 of the intake air temperature sensor 17, and the measured value P1 of the atmospheric pressure sensor 18 are acquired (S30).
  • T3 Intercooler outlet temperature calculation value
  • ⁇ specific heat ratio
  • ⁇ compressor efficiency
  • the cooling efficiency ⁇ c of the intercooler 6 is compared with a predetermined value (S60). If the cooling efficiency ⁇ c is less than the predetermined value, the cooling of the intercooler 6 is performed. It is diagnosed that the efficiency is deteriorated (S70), and conversely, if it is equal to or greater than the predetermined value, it is diagnosed that the cooling efficiency of the intercooler 6 is normal (S80). In addition, as a case where diagnostic conditions are materialized, the case where the vehicle speed of the vehicle carrying the diesel engine 1 is 20 km / h or more is illustrated.
  • the cooling efficiency ⁇ c of the intercooler 6 can be diagnosed at low cost. Further, since the conventional sensors 15 to 18 are used as they are, it is easy to attach the intercooler diagnostic system to the existing diesel engine 1.
  • the predetermined value used for diagnosing the cooling efficiency ⁇ c of the intercooler 6 varies depending on the size and performance of the diesel engine 1, but in the case of a general large vehicle, a value in the range of about 60 to 70% is used. It is desirable.
  • FIG. 3 shows an intercooler diagnostic system according to an embodiment of the present invention.
  • the notification means 22 for notifying the diagnosis result of the cooling efficiency ⁇ c of the intercooler 6 is connected to the processing means 21 through a signal line 20g.
  • 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.
  • the notification means 22 By providing the notification means 22 in this way, the deterioration of the cooling efficiency ⁇ c of the intercooler 6 can be transmitted early and reliably to the driver of the vehicle.
  • intercooler 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.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

This intercooler diagnosis system, which diagnoses the cooling efficiency of the intercooler (11) of a diesel engine (1), is configured from: an intake manifold temperature sensor (16) and a cylinder intake pressure sensor (15) installed at an intake manifold (7); an intake temperature sensor (17) installed at the vicinity of the intake opening (2) of an intake tube (3); an atmospheric pressure sensor (18) that measures atmospheric pressure; and a processing means (21). After closing the EGR valve (12), the processing means (21) calculates the cooling efficiency (ηc) of the intercooler (11) using a group of formulae that use the values measured by the abovementioned four sensors (15-18) and the like, and diagnoses the cooling efficiency (ηc) of the intercooler (11) by comparing the cooling efficiency (ηc) to a predetermined value.

Description

インタークーラー診断システムIntercooler diagnostic system
　本発明はインタークーラー診断システムに関し、更に詳しくは、インター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インタークーラー診断システムに関する。 The present invention relates to an intercooler diagnostic system, and more particularly to an intercooler diagnostic system that can diagnose the cooling efficiency of the intercooler at low cost.
　ディーゼルエンジンの出力増加を目的として、ターボチャージャーにより吸入空気量を増加させるとともに、そのターボチャージャーで圧縮された吸入空気をインタークーラーで冷却して吸入空気密度を高める機構が広く実用化されている（例えば、日本出願の特開２０１１－１８７７号公報を参照）。 For the purpose of increasing the output of a diesel engine, a mechanism for increasing the intake air density by increasing the intake air amount by a turbocharger and cooling the intake air compressed by the turbocharger by an intercooler has been widely put into practical use (for example, And Japanese Patent Application Laid-Open No. 2011-1877).
　この機構においてインタークーラーは、上述したディーゼルエンジンの出力増加のためだけでなく、適切な熱交換器の使用により省エネルギー化を進めることを規定した法律上の要請からも、高い冷却効率を有することが求められている。そのため、インター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。 In this mechanism, the intercooler is required not only to increase the output of the diesel engine described above, but also to have high cooling efficiency not only from legal requirements that stipulate that energy saving should be promoted by using an appropriate heat exchanger. It has been. Therefore, it is important to diagnose the cooling efficiency of the intercooler.
　従来より、インタークーラーの冷却効率の診断は、インタークーラーの出入口にそれぞれ温度センサを設置して、それらの測定値の差とターボチャージャーにおける温度上昇分とを比較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。 Conventionally, diagnosis of the cooling efficiency of the intercooler has been carried out by installing temperature sensors at the entrance and exit of the intercooler and comparing the difference between the measured values with the temperature rise in the turbocharger. 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.
日本出願の特開２０１１－１８７７号公報Japanese Patent Application Laid-Open No. 2011-1877
　本発明の目的は、インター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インター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 intercooler diagnostic system that can diagnose the cooling efficiency of an intercooler at low cost.
　上記の目的を達成する本発明のインタークーラー診断システムは、ディーゼルエンジンのインタークーラーの冷却効率を診断するインタークーラー診断システムであって、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及びインテークマニホールド温度センサと、そのインテークマニホールドに接続する吸気管の吸入口近傍に設置された吸気温度センサと、大気圧を測定する大気圧センサと、それらのセンサの測定値を処理しかつＥＧＲ通路を開閉するＥＧＲ弁を制御する処理手段とを備え、前記処理手段は、前記ＥＧＲ弁を閉止した後に、シリンダー吸気圧力センサの測定値Ｐ２、インテークマニホールド温度センサの測定値Ｔ４、吸気温度センサの測定値Ｔ１及び大気圧センサの測定値Ｐ１を用いて以下の（１）～（３）式によりインタークーラーの冷却効率ηcを算出し、前記冷却効率ηcが所定値未満であるときに前記インター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。
Figure JPOXMLDOC01-appb-I000002
An intercooler diagnostic system of the present invention that achieves the above object is an intercooler diagnostic system for diagnosing the cooling efficiency of a diesel engine intercooler, and includes a cylinder intake pressure sensor and an intake manifold temperature sensor installed in an intake manifold of the diesel engine. An intake air temperature sensor installed in the vicinity of the intake port of the intake pipe connected to the intake manifold, an atmospheric pressure sensor for measuring the atmospheric pressure, and an EGR valve for processing the measured values of these sensors and opening and closing the EGR passage And processing means for controlling, after the EGR valve is closed, the processing means measures the measured value P2 of the cylinder intake pressure sensor, the measured value T4 of the intake manifold temperature sensor, the measured value T1 of the intake temperature sensor, and the atmospheric pressure sensor. Using the measured value P1 The cooling efficiency ηc of the intercooler is calculated by the following formulas (1) to (3), and it is diagnosed that the cooling efficiency of the intercooler is deteriorated when the cooling efficiency ηc is less than a predetermined value. Is.
Figure JPOXMLDOC01-appb-I000002
　但し、Ｔ３：インタークーラー出口温度計算値、κ：比熱比、η：コンプレッサ効率をそれぞれ示す。 However, T3: Intercooler outlet temperature calculation value, κ: specific heat ratio, η: compressor efficiency, respectively.
　インタークーラーの冷却効率を診断するための所定値としては６０～７０％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 60 to 70% as the predetermined value for diagnosing the cooling efficiency of the intercooler.
　また、処理手段がインター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インター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。 In addition, since the processing means includes notification means for notifying the diagnosis result of the cooling efficiency of the intercooler, the deterioration of the cooling efficiency of the intercooler can be transmitted to the driver of the vehicle at an early stage and with certainty.
　本発明のインター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 intercooler diagnostic system of the present invention is suitably used for general internal combustion engines.
　本発明のインタークーラー診断システムによれば、インタークーラーの出入口に新たに温度センサを設置することなく、従来のセンサを用いるだけでよいため、インター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。 According to the intercooler diagnostic system of the present invention, it is only necessary to use a conventional sensor without newly installing a temperature sensor at the entrance / exit of the intercooler, so that the cooling efficiency of the intercooler can be diagnosed at low cost.
図１は、本発明の実施形態からなるインタークーラー診断システムの構成図である。FIG. 1 is a configuration diagram of an intercooler diagnostic system according to an embodiment of the present invention. 図２は、処理手段の処理内容を示すフロー図である。FIG. 2 is a flowchart showing the processing contents of the processing means. 図３は、本発明の別の実施形態からなるインタークーラー診断システムの構成図である。FIG. 3 is a configuration diagram of an intercooler diagnostic system according to another embodiment of the present invention.
　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インタークーラー診断システムを示す。 FIG. 1 shows an intercooler diagnostic system according to an embodiment of the present invention.
　このインター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のそれぞれに供給される。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 intercooler 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. It 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.
　本発明のインター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及びインテークマニホールド温度センサ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に設置された吸気温度センサ１７と、大気圧を測定する大気圧センサ１８と、それら４台のセンサ１５～１８、ＥＧＲ弁１２及びＥＣＵ（Engine Control Unit）１９に、それぞれ信号線２０ａ～２０ｆを通じて接続する処理手段２１とから構成されている。 The intercooler diagnostic system of the present invention includes a cylinder intake pressure sensor 15 and an intake manifold temperature sensor 16 installed in the intake manifold 7, and an intake air temperature sensor 17 installed in the intake pipe 3 between the air cleaner 4 and the turbocharger 5. And an atmospheric pressure sensor 18 for measuring the atmospheric pressure, and processing means 21 connected to the four sensors 15 to 18, the EGR valve 12 and the ECU (Engine Control Unit) 19 through signal lines 20a to 20f, respectively. Has been.
　シリンダー吸気圧力センサ１５及びインテークマニホールド温度センサ１６は、インテークマニホールド７内の空気の圧力及び温度をそれぞれ測定するものである。吸気温度センサ１７は、吸入口２から吸入されてターボチャージャー５に供給される空気の温度を測定する。また、大気圧センサ１８は、ディーゼルエンジン１の近傍に設置され、ディーゼルエンジン１の周囲の大気圧を測定する。これら４台のセンサ１５～１８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 and the intake manifold temperature sensor 16 measure the pressure and temperature of the air in the intake manifold 7, respectively. The intake air temperature sensor 17 measures the temperature of the air that is drawn from the intake port 2 and supplied to the turbocharger 5. The atmospheric pressure sensor 18 is installed in the vicinity of the diesel engine 1 and measures the atmospheric pressure around the diesel engine 1. These four sensors 15 to 18 are conventionally installed in order to provide the ECU 19 with measured values indicating the operating 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とともに、信号線２０ｅを通じてＥＧＲ弁１２の開度を制御する。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, acquires measurement values from the four sensors 15 to 18 through the signal lines 20a to 20d, and opens the EGR valve 12 through the signal line 20e. Control the degree. 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インター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 intercooler diagnostic system having such a configuration will be described below based on the flowchart shown in FIG.
　処理手段２１は、対象となる運転サイクルにおいてインタークーラー６の冷却効率の診断が終了していない場合（Ｓ１０）には、ＥＧＲ弁１２を閉止してＥＧＲクーラー１１の機能をオフにする（Ｓ２０）。そして、シリンダー吸気圧力センサ１５の測定値Ｐ２、インテークマニホールド温度センサ１６の測定値Ｔ４、吸気温度センサ１７の測定値Ｔ１及び大気圧センサ１８の測定値Ｐ１を取得する（Ｓ３０）。 When the diagnosis of the cooling efficiency of the intercooler 6 is not completed in the target operation cycle (S10), the processing means 21 closes the EGR valve 12 and turns off the function of the EGR cooler 11 (S20). Then, the measured value P2 of the cylinder intake pressure sensor 15, the measured value T4 of the intake manifold temperature sensor 16, the measured value T1 of the intake air temperature sensor 17, and the measured value P1 of the atmospheric pressure sensor 18 are acquired (S30).
　次に、それら取得した測定値Ｐ２、Ｔ４、Ｔ１及びＰ１を用いて、以下に示す（１）～（３）式によりインタークーラーの冷却効率ηｃを算出する（Ｓ４０）。
Figure JPOXMLDOC01-appb-I000003
Next, using the obtained measured values P2, T4, T1, and P1, the cooling efficiency ηc of the intercooler is calculated by the following equations (1) to (3) (S40).
Figure JPOXMLDOC01-appb-I000003
　但し、Ｔ３：インタークーラー出口温度計算値、κ：比熱比、η：コンプレッサ効率をそれぞれ示す。なお、コンプレッサ効率ηはターボチャージャー５の特性を示すマップデータから得ることができる。 However, T3: Intercooler outlet temperature calculation value, κ: specific heat ratio, η: compressor efficiency, respectively. The compressor efficiency η can be obtained from map data indicating the characteristics of the turbocharger 5.
　そして、診断条件が成立している場合（Ｓ５０）には、インタークーラー６の冷却効率ηｃと所定値とを比較して（Ｓ６０）、冷却効率ηｃが所定値未満の場合には、インタークーラー６の冷却効率が劣化していると診断し（Ｓ７０）、反対に所定値以上の場合には、インタークーラー６の冷却効率が正常であると診断する（Ｓ８０）。なお、診断条件が成立する場合としては、ディーゼルエンジン１を搭載した車両の車速が２０ｋｍ／ｈ以上である場合などが例示される。 If the diagnosis condition is satisfied (S50), the cooling efficiency ηc of the intercooler 6 is compared with a predetermined value (S60). If the cooling efficiency ηc is less than the predetermined value, the cooling of the intercooler 6 is performed. It is diagnosed that the efficiency is deteriorated (S70), and conversely, if it is equal to or greater than the predetermined value, it is diagnosed that the cooling efficiency of the intercooler 6 is normal (S80). In addition, as a case where diagnostic conditions are materialized, the case where the vehicle speed of the vehicle carrying the diesel engine 1 is 20 km / h or more is illustrated.
　以上のように、インタークーラー６の出入口に新たに温度センサを設置することなく、従来のセンサ１５～１８を用いて診断を行うので、インタークーラー６の冷却効率ηｃを低コストで診断することができる。また、従来のセンサ１５～１８をそのまま利用するため、既存のディーゼルエンジン１へのインタークーラー診断システムの取り付けが容易である。 As described above, since the diagnosis is performed using the conventional sensors 15 to 18 without newly installing a temperature sensor at the entrance / exit of the intercooler 6, the cooling efficiency ηc of the intercooler 6 can be diagnosed at low cost. Further, since the conventional sensors 15 to 18 are used as they are, it is easy to attach the intercooler diagnostic system to the existing diesel engine 1.
　インタークーラー６の冷却効率ηｃ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６０～７０％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 ηc of the intercooler 6 varies depending on the size and performance of the diesel engine 1, but in the case of a general large vehicle, a value in the range of about 60 to 70% is used. It is desirable.
　図３は、本発明の実施形態からなるインタークーラー診断システムを示す。 FIG. 3 shows an intercooler diagnostic system according to an embodiment of the present invention.
　このインタークーラー診断システムは、インタークーラー６の冷却効率ηｃの診断結果を通知する通知手段２２を、信号線２０ｇ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 intercooler diagnostic system, the notification means 22 for notifying the diagnosis result of the cooling efficiency ηc of the intercooler 6 is connected to the processing means 21 through a signal line 20g. 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、インタークーラー６の冷却効率ηｃ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 ηc of the intercooler 6 can be transmitted early and reliably to the driver of the vehicle.
　本発明のインター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 intercooler 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　インタークーラー
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　インテークマニホールド温度センサ
１７　吸気温度センサ
１８　大気圧センサ
１９　ＥＣＵ
２０ａ～２０ｇ　信号線
２１　処理手段
２２　通知手段 DESCRIPTION OF SYMBOLS 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 Intercooler 12 EGR valve 13 Exhaust return passage 14 Outlet 15 Cylinder intake pressure sensor 16 Intake manifold temperature sensor 17 Intake air temperature sensor 18 Atmospheric pressure sensor 19 ECU
20a to 20g Signal line 21 Processing means 22 Notification means

Claims (4)

  1. 　ディーゼルエンジンのインタークーラーの冷却効率を診断するインター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及びインテークマニホールド温度センサと、そのインテークマニホールドに接続する吸気管の吸入口近傍に設置された吸気温度センサと、大気圧を測定する大気圧センサと、　それらのセンサの測定値を処理しかつＥＧＲ通路を開閉するＥＧＲ弁を制御する処理手段とを備え、
    　前記処理手段は、前記ＥＧＲ弁を閉止した後に、前記シリンダー吸気圧力センサの測定値Ｐ２、インテークマニホールド温度センサの測定値Ｔ４、吸気温度センサの測定値Ｔ１及び大気圧センサの測定値Ｐ１を用いて以下の（１）～（３）式によりインタークーラーの冷却効率ηcを算出し、
    　前記冷却効率ηcが所定値未満であるときに前記インター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インタークーラー診断システム。
    Figure JPOXMLDOC01-appb-I000001
    　但し、Ｔ３：インタークーラー出口温度計算値、κ：比熱比、η：コンプレッサ効率をそれぞれ示す。     An intercooler diagnostic system for diagnosing the cooling efficiency of a diesel engine intercooler,
    Cylinder intake pressure sensor and intake manifold temperature sensor installed in the intake manifold of the diesel engine, an intake temperature sensor installed in the vicinity of the intake port of the intake pipe connected to the intake manifold, and an atmospheric pressure sensor for measuring atmospheric pressure And processing means for processing the measured values of those sensors and controlling the EGR valve that opens and closes the EGR passage,
    The processing means uses the measured value P2 of the cylinder intake pressure sensor, the measured value T4 of the intake manifold temperature sensor, the measured value T1 of the intake air temperature sensor, and the measured value P1 of the atmospheric pressure sensor after closing the EGR valve. Calculate the cooling efficiency ηc of the intercooler by the following formulas (1) to (3),
    An intercooler diagnosis system that diagnoses that the cooling efficiency of the intercooler is deteriorated when the cooling efficiency ηc is less than a predetermined value.
    Figure JPOXMLDOC01-appb-I000001
    However, T3: Intercooler outlet temperature calculation value, κ: specific heat ratio, η: compressor efficiency, respectively.
  2. 　前記所定値が６０～７０％である請求項１に記載のインタークーラー診断システム。 The intercooler diagnostic system according to claim 1, wherein the predetermined value is 60 to 70%.
  3. 　前記処理手段が前記インター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に記載のインタークーラー診断システム。 The intercooler diagnosis system according to claim 1 or 2, wherein the processing means includes notification means for notifying a result of diagnosis of cooling efficiency of the intercooler.
  4. 　請求項１～３のいずれかに記載のインタークーラーの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 intercooler diagnostic system according to any one of claims 1 to 3.
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