JP2006125215A - Exhaust gas recirculation device for internal combustion engine - Google Patents

Exhaust gas recirculation device for internal combustion engine Download PDF

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JP2006125215A
JP2006125215A JP2004311050A JP2004311050A JP2006125215A JP 2006125215 A JP2006125215 A JP 2006125215A JP 2004311050 A JP2004311050 A JP 2004311050A JP 2004311050 A JP2004311050 A JP 2004311050A JP 2006125215 A JP2006125215 A JP 2006125215A
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temperature
egr
egr gas
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Koichiro Nakatani
好一郎 中谷
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Toyota Motor Corp
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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
    • 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
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide technology supplying EGR gas of appropriate temperature according to an operation condition of an internal combustion engine in an exhaust gas recirculation device for the internal combustion engine. <P>SOLUTION: This device is provided with an EGR cooler 23, an EGR cooler side passage 27 provided with the EGR cooler 23, a bypass passage 22 bypassing the EGR cooler 23, a change-over valve 24 regulating quantity of EGR gas flowing the EGR cooler side passage 27 and the bypass passage 22, and a heat accumulating means 26 exchanging heat with EGR gas flowing in the EGR cooler side passage 27 and exchanging heat with EGR gas flowing in the bypass passage 22. Heat is give to EGR gas from the heat accumulation means at light load when temperature of EGR gas need to be raised and heat is taken away from EGR gas by the heat accumulation means at heavy load when temperature of EGR Gas need to be lowered. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、内燃機関の排気循環装置に関する。   The present invention relates to an exhaust gas circulation device for an internal combustion engine.

ＥＧＲ通路の途中にＥＧＲクーラを備え、該ＥＧＲクーラによりＥＧＲガスを冷却してＥＧＲガスの体積を縮小させることにより、内燃機関の気筒内により多くのＥＧＲガスを入れることができる。しかし、軽負荷時においてＥＧＲガスを冷却すると、気筒内の吸気（ＥＧＲガスおよび新気）の温度が低くなりすぎて燃焼状態が不安定となり、ＨＣを排出するおそれがある。   By providing an EGR cooler in the middle of the EGR passage and cooling the EGR gas by the EGR cooler to reduce the volume of the EGR gas, a larger amount of EGR gas can be put into the cylinder of the internal combustion engine. However, if the EGR gas is cooled at a light load, the temperature of the intake air (EGR gas and fresh air) in the cylinder becomes too low, and the combustion state becomes unstable, and HC may be discharged.

これに対し、ＥＧＲクーラを迂回させるバイパス通路が備え、軽負荷時にはＥＧＲガスを該バイパス通路に流してＥＧＲガス温度の低下を抑制する技術が知られている（例えば、特許文献１参照。）。
特開平７−１６６９７３号公報 特開平１１−１１７８１５号公報 特開２００４−４４４８４号公報 特開平１０−８９１５８号公報 On the other hand, a technique is known in which a bypass passage that bypasses the EGR cooler is provided, and the EGR gas is caused to flow through the bypass passage at a light load to suppress a decrease in EGR gas temperature (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 7-166773 JP-A-11-117815 JP 2004-44484 A Japanese Patent Laid-Open No. 10-89158

しかし、内燃機関の排気温度が低い軽負荷時には、ＥＧＲガスをバイパス通路に流したとしても、内燃機関の吸気温度を十分に上昇させることができない場合があり、ＨＣを排出するおそれがある。また、内燃機関の排気温度が高い高負荷時には、ＥＧＲガスをＥＧＲクーラに流したとしても、ＥＧＲガスの温度を十分に低下させることができない場合がある。   However, when the exhaust gas temperature of the internal combustion engine is low and the load is low, even if EGR gas flows through the bypass passage, the intake air temperature of the internal combustion engine may not be sufficiently increased, and HC may be discharged. In addition, when the exhaust gas temperature of the internal combustion engine is high and the load is high, even if the EGR gas flows through the EGR cooler, the temperature of the EGR gas may not be sufficiently reduced.

本発明は、上記したような問題点に鑑みてなされたものであり、内燃機関の排気循環装置において、内燃機関の運転状態に応じて適正な温度のＥＧＲガスを供給することができる技術を提供することを目的とする。   The present invention has been made in view of the above-described problems, and provides a technique capable of supplying EGR gas at an appropriate temperature in accordance with the operating state of the internal combustion engine in the exhaust circulation device of the internal combustion engine. The purpose is to do.

上記課題を達成するために本発明による内燃機関の排気循環装置は、
ＥＧＲガスの温度を低下させるＥＧＲクーラと、
前記ＥＧＲクーラが備えられるＥＧＲクーラ側通路と、
前記ＥＧＲクーラを迂回するバイパス通路と、
前記ＥＧＲクーラ側通路および前記バイパス通路に流れるＥＧＲガスの量を調整する切替弁と、
前記ＥＧＲクーラ側通路を流れるＥＧＲガスと熱交換し、且つ前記バイパス通路を流れるＥＧＲガスと熱交換する蓄熱手段と、
を具備することを特徴とする。 In order to achieve the above object, an exhaust gas circulation device for an internal combustion engine according to the present invention comprises:
An EGR cooler that lowers the temperature of the EGR gas;
An EGR cooler side passage provided with the EGR cooler;
A bypass passage that bypasses the EGR cooler;
A switching valve for adjusting the amount of EGR gas flowing through the EGR cooler side passage and the bypass passage;
Heat storage means for exchanging heat with the EGR gas flowing through the EGR cooler side passage and with the EGR gas flowing through the bypass passage;
It is characterized by comprising.

ここで、ＥＧＲクーラは、例えばＥＧＲガスと、内燃機関外部の空気若しくは内燃機関の冷却水と、で熱交換をしてＥＧＲガスの温度を低下させる。また、バイパス通路は、例えばＥＧＲクーラの上流側のＥＧＲ通路と下流側のＥＧＲ通路とを接続する通路により構成される。切替弁は、例えば、ＥＧＲクーラが備わるＥＧＲ通路とバイパス通路との通路面積を変更することにより、ＥＧＲクーラおよびバイパス通路に流れるＥＧＲガスの量を調整する。この切替弁は、ＥＧＲガスの流量割合を変更する弁としてもよい。   Here, the EGR cooler lowers the temperature of the EGR gas by exchanging heat with, for example, EGR gas and air outside the internal combustion engine or cooling water of the internal combustion engine. Further, the bypass passage is constituted by a passage connecting, for example, an upstream EGR passage and a downstream EGR passage of the EGR cooler. For example, the switching valve adjusts the amount of EGR gas flowing through the EGR cooler and the bypass passage by changing the passage area between the EGR passage and the bypass passage provided with the EGR cooler. This switching valve is good also as a valve which changes the flow rate ratio of EGR gas.

ＥＧＲガスがＥＧＲクーラを通過すると、該ＥＧＲガスの温度が低下する。これによりＥＧＲガスの体積が縮小し密度が大きくなるので、気筒内へより多くのＥＧＲガスを入れることができる。   When the EGR gas passes through the EGR cooler, the temperature of the EGR gas decreases. As a result, the volume of the EGR gas is reduced and the density is increased, so that more EGR gas can be put into the cylinder.

ここで、ＥＧＲガスをＥＧＲクーラへ流すときは、ＥＧＲガスの温度が高い場合であり、ＥＧＲガスの温度を可及的に低下させたい場合である。一方、ＥＧＲガスをバイパス通路に流すときは、ＥＧＲガスの温度が低い場合であり、ＥＧＲガスの温度を可及的に上昇させたい場合である。   Here, when the EGR gas is allowed to flow to the EGR cooler, the temperature of the EGR gas is high, and the temperature of the EGR gas is desired to be reduced as much as possible. On the other hand, when the EGR gas is caused to flow through the bypass passage, the temperature of the EGR gas is low, and the temperature of the EGR gas is desired to be raised as much as possible.

そして、高い温度のＥＧＲガスがＥＧＲクーラ側通路に流れると、ＥＧＲガスと蓄熱手段とで熱交換が行われる。その結果、ＥＧＲガスの温度は低下し、蓄熱手段の温度は上昇する。一方、低い温度のＥＧＲガスがバイパス通路に流れると、ＥＧＲガスと蓄熱手段とで熱交換が行われる。蓄熱手段は、高い温度のＥＧＲガスと熱交換を行い、高い温度となっているので、バイパス通路を流れる低い温度のＥＧＲガスは、蓄熱手段から熱を受ける。その結果、ＥＧＲガスの温度は上昇し、蓄熱手段の温度は低下する。その後、高い温度のＥＧＲガスがＥＧＲクーラ側に流れると、再び蓄熱手段の温度が上昇される。   When high-temperature EGR gas flows through the EGR cooler side passage, heat exchange is performed between the EGR gas and the heat storage means. As a result, the temperature of the EGR gas decreases and the temperature of the heat storage means increases. On the other hand, when EGR gas having a low temperature flows through the bypass passage, heat exchange is performed between the EGR gas and the heat storage means. Since the heat storage means performs heat exchange with the high temperature EGR gas and has a high temperature, the low temperature EGR gas flowing through the bypass passage receives heat from the heat storage means. As a result, the temperature of the EGR gas increases and the temperature of the heat storage means decreases. Thereafter, when high-temperature EGR gas flows to the EGR cooler side, the temperature of the heat storage means is increased again.

このようにして、ＥＧＲガスの温度を高くしたい軽負荷時には、蓄熱手段からＥＧＲガスに熱が与えられるので、ＥＧＲガスの温度を上昇させることができる。一方、ＥＧＲガスの温度を低くしたい高負荷時には、ＥＧＲガスの熱が蓄熱手段により奪われるので、ＥＧＲガスの温度を低下させることができる。   In this way, at a light load when it is desired to increase the temperature of the EGR gas, heat is applied to the EGR gas from the heat storage means, so that the temperature of the EGR gas can be increased. On the other hand, at the time of high load when it is desired to lower the temperature of the EGR gas, the heat of the EGR gas is taken away by the heat storage means, so that the temperature of the EGR gas can be lowered.

本発明においては、前記蓄熱手段は、バイパス通路内に設けられ化学反応により蓄熱する蓄熱材からなっていてもよい。
化学反応により蓄熱する蓄熱材は、熱を受けることにより化学反応を起こして他の化合物に変化し、元に戻る際に熱を放出する蓄熱材としてもよい。 In the present invention, the heat storage means may be formed of a heat storage material that is provided in the bypass passage and stores heat by a chemical reaction.
The heat storage material that stores heat by a chemical reaction may be a heat storage material that undergoes a chemical reaction by receiving heat, changes to another compound, and releases heat when returning to its original state.

例えば、ＥＧＲクーラ側通路にＥＧＲガスが流れた場合には、ＥＧＲガスの熱により化学変化が起こり、この熱を蓄熱手段に蓄えると供に、ＥＧＲガスの温度を低下させることができる。また、バイパス通路にＥＧＲガスを流すときには、該バイパス通路を流れるＥＧＲガスに含まれる例えばＨ2Ｏと蓄熱手段との化学反応により該蓄熱手段が発熱して該蓄熱手段に蓄えられた熱が放出されると供に、この熱によりＥＧＲガスの温度を上昇させることができる。 For example, when the EGR gas flows through the EGR cooler side passage, a chemical change occurs due to the heat of the EGR gas, and this heat can be stored in the heat storage means and the temperature of the EGR gas can be lowered. Further, when the EGR gas is caused to flow through the bypass passage, the heat storage means generates heat due to a chemical reaction between, for example, H 2 O contained in the EGR gas flowing through the bypass passage and the heat storage means, and the heat stored in the heat storage means is released. In addition, the temperature of the EGR gas can be raised by this heat.

本発明においては、第１所定条件が成立したときに、前記バイパス通路を通過するＥＧＲガスに対して前記蓄熱手段が熱を与えることができる。
第１所定条件とは、例えば、内燃機関の回転数、負荷、排気の温度、蓄熱材の温度等に基づいて決定される条件である。これらの条件が異なると、要求されるＥＧＲガスの温度が異なるため、この条件に応じてＥＧＲガスに熱を供給するか否か決定するようにすれば、適正な温度のＥＧＲガスを供給することが可能となる。そして、ＥＧＲガスの温度を上昇させる必要がある場合、若しくは、ＥＧＲガスの温度を上昇させることができる場合に第１所定条件が成立したとすることができる。 In the present invention, when the first predetermined condition is satisfied, the heat storage means can give heat to the EGR gas passing through the bypass passage.
The first predetermined condition is a condition determined based on, for example, the rotational speed of the internal combustion engine, the load, the temperature of the exhaust, the temperature of the heat storage material, and the like. If these conditions are different, the required temperature of the EGR gas is different. Therefore, if it is determined whether to supply heat to the EGR gas according to this condition, the EGR gas having an appropriate temperature can be supplied. Is possible. The first predetermined condition may be satisfied when the temperature of the EGR gas needs to be increased, or when the temperature of the EGR gas can be increased.

本発明においては、前記第１所定条件とは、前記バイパス通路を通過するＥＧＲガスが第１所定温度以下のときであってもよい。
すなわち、バイパス通路を流れるＥＧＲガスの温度が十分に高い場合には、蓄熱手段の温度よりもバイパス通路を流れるＥＧＲガス温度のほうが高いことがあり、その場合、ＥＧＲガスから蓄熱手段へ伝熱が起こるため、ＥＧＲガスの温度が蓄熱手段により低下されてしまう。一方、蓄熱手段が蓄熱する温度を高く設定すると、該蓄熱手段の温度が安定せ
ずにＥＧＲガス温度の制御が困難となるおそれがある。その点、ＥＧＲガスの温度が第１所定温度以下のときにバイパス通路を通過するＥＧＲガスに対して蓄熱手段が熱を与えるようにすれば、蓄熱手段の設定温度を高くする必要がなくなり、ＥＧＲガスの温度を安定させることができる。すなわち、第１所定温度は、蓄熱材によりＥＧＲガスの温度を上昇させ得る温度とすることができる。 In the present invention, the first predetermined condition may be when the EGR gas passing through the bypass passage is equal to or lower than a first predetermined temperature.
That is, when the temperature of the EGR gas flowing through the bypass passage is sufficiently high, the temperature of the EGR gas flowing through the bypass passage may be higher than the temperature of the heat storage means, and in that case, heat transfer from the EGR gas to the heat storage means may occur. As a result, the temperature of the EGR gas is lowered by the heat storage means. On the other hand, if the temperature at which the heat storage means stores heat is set high, the temperature of the heat storage means may not be stable, and it may be difficult to control the EGR gas temperature. In that respect, if the heat storage means gives heat to the EGR gas passing through the bypass passage when the temperature of the EGR gas is equal to or lower than the first predetermined temperature, it is not necessary to increase the set temperature of the heat storage means. The gas temperature can be stabilized. That is, the first predetermined temperature can be a temperature at which the temperature of the EGR gas can be increased by the heat storage material.

本発明においては、第２所定条件が成立したときに、前記ＥＧＲクーラ側通路に流入するＥＧＲガスから前記蓄熱手段が熱を受けることができる。
第２所定条件とは、例えば、内燃機関の回転数、負荷、排気の温度、蓄熱材の温度等に基づいて決定される条件である。これらの条件が異なると、要求されるＥＧＲガスの温度が異なるため、この条件に応じてＥＧＲガスに熱を供給するか否か決定するようにすれば、適正な温度のＥＧＲガスを供給することが可能となる。そして、ＥＧＲガスの温度を低下させる必要がある場合、若しくは、ＥＧＲガスの温度を低下させることができる場合に第２所定条件が成立したとすることができる。 In the present invention, when the second predetermined condition is satisfied, the heat storage means can receive heat from the EGR gas flowing into the EGR cooler side passage.
The second predetermined condition is a condition determined based on, for example, the rotational speed of the internal combustion engine, the load, the temperature of the exhaust, the temperature of the heat storage material, and the like. If these conditions are different, the required temperature of the EGR gas is different. Therefore, if it is determined whether to supply heat to the EGR gas according to this condition, the EGR gas having an appropriate temperature can be supplied. Is possible. The second predetermined condition can be assumed to be satisfied when the temperature of the EGR gas needs to be lowered or when the temperature of the EGR gas can be lowered.

本発明においては、前記第２所定条件とは、前記ＥＧＲクーラ側通路に流入するＥＧＲガスが第２所定温度以上のときであってもよい。
すなわち、ＥＧＲクーラ側通路を流れるＥＧＲガスの温度が十分に低い場合には、蓄熱手段の温度よりもＥＧＲクーラ側通路を流れるＥＧＲガス温度のほうが低いことがあり、その場合、蓄熱手段からＥＧＲガスへ伝熱が起こるため、ＥＧＲガスの温度が蓄熱手段により上昇されてしまう。一方、蓄熱手段が蓄熱する温度を高く設定すると、該蓄熱手段の温度が安定せずにＥＧＲガス温度の制御が困難となるおそれがある。その点、ＥＧＲガスの温度が第２所定温度以上のときに、ＥＧＲクーラ側通路を通過するＥＧＲガスが蓄熱手段に対して熱を与えるようにすれば、蓄熱手段の設定温度を高くする必要がなくなり、ＥＧＲガスの温度を安定させることができる。すなわち、第２所定温度は、蓄熱材によりＥＧＲガスの温度を低下させ得る温度とすることができる。 In the present invention, the second predetermined condition may be when the EGR gas flowing into the EGR cooler side passage is equal to or higher than a second predetermined temperature.
That is, when the temperature of the EGR gas flowing through the EGR cooler side passage is sufficiently low, the temperature of the EGR gas flowing through the EGR cooler side passage may be lower than the temperature of the heat storage means. Therefore, the temperature of the EGR gas is raised by the heat storage means. On the other hand, if the temperature at which the heat storage means stores heat is set high, the temperature of the heat storage means may not be stable, and it may be difficult to control the EGR gas temperature. In that respect, if the EGR gas passing through the EGR cooler side passage gives heat to the heat storage means when the temperature of the EGR gas is equal to or higher than the second predetermined temperature, it is necessary to increase the set temperature of the heat storage means. The temperature of the EGR gas can be stabilized. That is, the second predetermined temperature can be a temperature at which the temperature of the EGR gas can be lowered by the heat storage material.

本発明においては、前記バイパス通路を流れるＥＧＲガスの温度が第１所定温度以下のときに前記バイパス通路と前記蓄熱手段とを接続するバイパス側接続手段をさらに備えることができる。   In the present invention, it may further include a bypass side connection means for connecting the bypass passage and the heat storage means when the temperature of the EGR gas flowing through the bypass passage is equal to or lower than a first predetermined temperature.

すなわち、バイパス側接続手段によれば、バイパス通路を流れるＥＧＲガスの温度が第１所定温度以下のときに蓄熱手段とＥＧＲガスとが接続されることにより熱交換が行われるため、常に蓄熱手段からＥＧＲガスへ向かって熱を供給することが可能となるので、ＥＧＲガスの温度を上昇させることができる。   That is, according to the bypass side connection means, heat exchange is performed by connecting the heat storage means and the EGR gas when the temperature of the EGR gas flowing through the bypass passage is equal to or lower than the first predetermined temperature. Since heat can be supplied toward the EGR gas, the temperature of the EGR gas can be increased.

本発明においては、前記ＥＧＲクーラ側通路を流れるＥＧＲガスの温度が第２所定温度以上のときに前記ＥＧＲクーラ側通路と前記蓄熱手段とを接続するＥＧＲクーラ側接続手段をさらに備えることができる。   In the present invention, EGR cooler side connection means for connecting the EGR cooler side path and the heat storage means when the temperature of the EGR gas flowing through the EGR cooler side path is equal to or higher than a second predetermined temperature can be further provided.

すなわち、ＥＧＲクーラ側接続手段によれば、ＥＧＲクーラ側通路を流れるＥＧＲガスの温度が第２所定温度以上のときに蓄熱手段とＥＧＲガスとが接続されることにより熱交換が行われるため、常にＥＧＲガスから蓄熱手段へ向かって熱を供給することが可能となるので、ＥＧＲガスの温度を低下させることができる。   That is, according to the EGR cooler side connection means, heat exchange is performed by connecting the heat storage means and the EGR gas when the temperature of the EGR gas flowing through the EGR cooler side passage is equal to or higher than the second predetermined temperature. Since heat can be supplied from the EGR gas toward the heat storage means, the temperature of the EGR gas can be lowered.

本発明においては、前記蓄熱手段は、前記ＥＧＲクーラ側通路を流れるＥＧＲガスおよび前記バイパス通路を流れるＥＧＲガスとヒートパイプを介して熱交換することができる。   In the present invention, the heat storage means can exchange heat with the EGR gas flowing through the EGR cooler side passage and the EGR gas flowing through the bypass passage via a heat pipe.

すなわち、ヒートパイプによれば、熱を一方向にのみ伝えることができるので、ＥＧＲ
クーラ側通路を流れる高温のＥＧＲガスから蓄熱手段へ向かって伝熱させ、蓄熱手段からバイパス通路へ向かって伝熱させることができる。 That is, according to the heat pipe, since heat can be transferred only in one direction, EGR
Heat can be transferred from the high-temperature EGR gas flowing in the cooler-side passage toward the heat storage means, and heat can be transferred from the heat storage means toward the bypass passage.

本発明に係る内燃機関の排気循環装置では、高い温度のＥＧＲガスが必要とされるときには蓄熱手段がＥＧＲガスの温度を上昇させ、低い温度のＥＧＲガスが必要とされるときには蓄熱手段がＥＧＲガスの温度を低下させるので、内燃機関の運転状態に応じて適正な温度のＥＧＲガスを供給することができる。   In the exhaust gas recirculation apparatus for an internal combustion engine according to the present invention, the heat storage means increases the temperature of the EGR gas when a high temperature EGR gas is required, and the heat storage means is the EGR gas when a low temperature EGR gas is required. Therefore, EGR gas having an appropriate temperature can be supplied according to the operating state of the internal combustion engine.

以下、本発明に係る内燃機関の排気循環装置の具体的な実施態様について図面に基づいて説明する。   Hereinafter, a specific embodiment of an exhaust gas circulation device for an internal combustion engine according to the present invention will be described with reference to the drawings.

図１は、本実施例に係る内燃機関の排気循環装置を適用する内燃機関１とその吸・排気系の概略構成を示す図である。
図１に示す内燃機関１は、４つの気筒２を有する水冷式の４サイクル・ディーゼルエンジンである。 FIG. 1 is a diagram showing a schematic configuration of an internal combustion engine 1 to which the exhaust gas circulation device for an internal combustion engine according to the present embodiment is applied and its intake / exhaust system.
An internal combustion engine 1 shown in FIG. 1 is a water-cooled four-cycle diesel engine having four cylinders 2.

内燃機関１には、吸気通路３が接続されている。吸気通路３の途中には、排気のエネルギを駆動源として作動するターボチャージャ４のコンプレッサハウジング４ａが設けられている。ターボチャージャ４よりも下流の吸気通路３には、該吸気通路３内を流通する吸気の流量を調節する吸気絞り弁５が設けられている。また、ターボチャージャ４よりも上流の吸気通路３の途中には、該吸気通路３を通過する空気の流量に応じた信号を出力するエアフローメータ６が取り付けられている。このエアフローメータ６の出力信号により内燃機関１に吸入される新気の量を得ることができる。   An intake passage 3 is connected to the internal combustion engine 1. A compressor housing 4 a of a turbocharger 4 that operates using exhaust energy as a drive source is provided in the intake passage 3. An intake throttle valve 5 that adjusts the flow rate of the intake air flowing through the intake passage 3 is provided in the intake passage 3 downstream of the turbocharger 4. An air flow meter 6 that outputs a signal corresponding to the flow rate of air passing through the intake passage 3 is attached in the middle of the intake passage 3 upstream of the turbocharger 4. The amount of fresh air taken into the internal combustion engine 1 can be obtained from the output signal of the air flow meter 6.

一方、内燃機関１には、排気通路７が接続されている。排気通路７の途中には、前記ターボチャージャ４のタービンハウジング４ｂが設けられている。
また、内燃機関１には、排気通路７内を流通する排気の一部（以下、ＥＧＲガスという。）を吸気通路３へ再循環させるＥＧＲ装置２０が備えられている。このＥＧＲ装置２０は、ＥＧＲ通路２１、ＥＧＲクーラ側通路２７、バイパス通路２２、ＥＧＲクーラ２３、切替弁２４、ＥＧＲ弁２５を備えて構成されている。ＥＧＲ通路２１は、ターボチャージャ４よりも上流の排気通路７と、吸気絞り弁５よりも下流の吸気通路３と、を接続している。このＥＧＲ通路２１を通って、ＥＧＲガスが再循環される。 On the other hand, an exhaust passage 7 is connected to the internal combustion engine 1. In the middle of the exhaust passage 7, a turbine housing 4 b of the turbocharger 4 is provided.
Further, the internal combustion engine 1 is provided with an EGR device 20 that recirculates a part of the exhaust gas (hereinafter referred to as EGR gas) flowing through the exhaust passage 7 to the intake passage 3. The EGR device 20 includes an EGR passage 21, an EGR cooler-side passage 27, a bypass passage 22, an EGR cooler 23, a switching valve 24, and an EGR valve 25. The EGR passage 21 connects the exhaust passage 7 upstream of the turbocharger 4 and the intake passage 3 downstream of the intake throttle valve 5. The EGR gas is recirculated through the EGR passage 21.

ＥＧＲ通路２１は、途中でバイパス通路２２とＥＧＲクーラ側通路２７とに分岐し、夫々の通路は切替弁２４に接続されている。この切替弁２４よりも吸気通路３側のＥＧＲ通路２１には、ＥＧＲ弁２５が設けられている。また、ＥＧＲクーラ側通路２７の途中には、ＥＧＲクーラ２３が設けられている。   The EGR passage 21 branches into a bypass passage 22 and an EGR cooler-side passage 27 on the way, and each passage is connected to a switching valve 24. An EGR valve 25 is provided in the EGR passage 21 closer to the intake passage 3 than the switching valve 24. An EGR cooler 23 is provided in the middle of the EGR cooler side passage 27.

ＥＧＲクーラ２３には、内燃機関１の冷却水が循環しており、該ＥＧＲクーラ２３においてＥＧＲガスと内燃機関の冷却水とで熱交換が行われ、ＥＧＲガスが冷却される。切替弁２４は、後述するＥＣＵ１０からの信号により作動し、ＥＧＲガスの全体量に対して、ＥＧＲクーラ側通路２７とバイパス通路２２とを流れるＥＧＲガスの割合を変更する弁である。ＥＧＲ弁２５は、後述するＥＣＵ１０からの信号により開閉し、該ＥＧＲ通路２１から吸気通路３へ流出するＥＧＲガスの量を調整する。   Cooling water for the internal combustion engine 1 circulates in the EGR cooler 23, and heat exchange is performed between the EGR gas and the cooling water for the internal combustion engine in the EGR cooler 23, thereby cooling the EGR gas. The switching valve 24 is operated by a signal from the ECU 10 described later, and is a valve that changes the ratio of the EGR gas flowing through the EGR cooler side passage 27 and the bypass passage 22 with respect to the total amount of EGR gas. The EGR valve 25 is opened and closed by a signal from the ECU 10 described later, and adjusts the amount of EGR gas flowing out from the EGR passage 21 to the intake passage 3.

ＥＧＲクーラ２３よりも排気通路７側のＥＧＲクーラ側通路２７の外壁の一部には、蓄熱材２６の一端が接続されている。また、バイパス通路２２の外壁の一部には、蓄熱材２
６の他端が接続されている。 One end of the heat storage material 26 is connected to a part of the outer wall of the EGR cooler side passage 27 closer to the exhaust passage 7 than the EGR cooler 23. Further, a part of the outer wall of the bypass passage 22 has a heat storage material 2
The other end of 6 is connected.

蓄熱材２６は、例えば３００℃で状態が変化する金属基からなり、例えば３００℃よりも高くなると融解若しくは昇華し、そのときの内部エネルギの増加分として熱を蓄える。一方、例えば３００℃よりも低くなると蓄熱材２６が凝固し、そのときに蓄熱材２６から熱が放出される。すなわち、例えば、ＥＧＲガスの温度が３００℃よりも高い場合には、ＥＧＲガスの持つ熱を蓄熱材２６が潜熱の形で蓄え、ＥＧＲガスの温度が３００℃よりも低い場合には、蓄熱材２６が潜熱の形で蓄えた熱をＥＧＲガスに与える。   The heat storage material 26 is made of, for example, a metal group whose state changes at 300 ° C., and melts or sublimates when the temperature is higher than 300 ° C., for example, and stores heat as an increase in internal energy at that time. On the other hand, for example, when the temperature is lower than 300 ° C., the heat storage material 26 is solidified, and then heat is released from the heat storage material 26. That is, for example, when the temperature of the EGR gas is higher than 300 ° C., the heat storage material 26 stores the heat of the EGR gas in the form of latent heat, and when the temperature of the EGR gas is lower than 300 ° C. The heat stored in the form of latent heat 26 is applied to the EGR gas.

このように、例えば３００℃で状態が変化する金属基を蓄熱材２６として用いると、該蓄熱材２６の温度が３００℃となっているときにＥＧＲガスと熱交換をしても、ある程度の熱交換の範囲内では該蓄熱材２６の温度が３００℃に保たれるため、吸気温度の制御が容易となる。   Thus, for example, when a metal group whose state changes at 300 ° C. is used as the heat storage material 26, even if heat exchange with the EGR gas is performed when the temperature of the heat storage material 26 is 300 ° C., a certain amount of heat is generated. Since the temperature of the heat storage material 26 is maintained at 300 ° C. within the replacement range, the intake air temperature can be easily controlled.

例えば、バイパス通路２２にＥＧＲガスを流すときは、該ＥＧＲガスの温度が１００℃から２５０℃の場合とし、ＥＧＲクーラ側通路２７にＥＧＲガスを流すときは、該ＥＧＲガスの温度が２００℃から５００℃の場合として、これらを目安に蓄熱材２６の状態が変化する温度（以下、設定温度という。）を２００℃から４００℃の間とすることもできる。また、予め定められた切替弁２４を切り替えるときのＥＧＲガスの温度に基づいて蓄熱材２６の設定温度を定めてもよい。   For example, when the EGR gas is allowed to flow into the bypass passage 22, the temperature of the EGR gas is from 100 ° C. to 250 ° C., and when the EGR gas is allowed to flow into the EGR cooler side passage 27, the temperature of the EGR gas is from 200 ° C. In the case of 500 ° C., the temperature at which the state of the heat storage material 26 changes (hereinafter referred to as set temperature) can be set between 200 ° C. and 400 ° C. using these as a guide. Further, the set temperature of the heat storage material 26 may be determined based on the temperature of the EGR gas when the predetermined switching valve 24 is switched.

なお、本実施例においては、蓄熱材２６が、本発明における蓄熱手段に相当する。
また、内燃機関１には該内燃機関１を制御するための電子制御ユニットであるＥＣＵ１０が併設されている。このＥＣＵ１０は、内燃機関１の運転条件や運転者の要求に応じて内燃機関１の運転状態を制御するユニットである。 In the present embodiment, the heat storage material 26 corresponds to the heat storage means in the present invention.
The internal combustion engine 1 is also provided with an ECU 10 that is an electronic control unit for controlling the internal combustion engine 1. The ECU 10 is a unit that controls the operation state of the internal combustion engine 1 in accordance with the operation conditions of the internal combustion engine 1 and the request of the driver.

ＥＣＵ１０には、エアフローメータ６の他、アクセル開度に応じた信号を出力するアクセル開度センサ１１が電気配線を介して接続され、該センサ等の出力信号が入力されるようになっている。このアクセル開度センサ１１により内燃機関１の負荷を得ることができる。   In addition to the air flow meter 6, an accelerator opening sensor 11 that outputs a signal corresponding to the accelerator opening is connected to the ECU 10 via an electrical wiring, and an output signal from the sensor or the like is input thereto. The load of the internal combustion engine 1 can be obtained by the accelerator opening sensor 11.

一方、ＥＣＵ１０には吸気絞り弁５、切替弁２４、およびＥＧＲ弁２５が電気配線を介して接続され、ＥＣＵ１０によりこれらが制御される。
なお、本実施例においては、内燃機関１に流入するＥＧＲガスの流量をそのときの内燃機関１の運転状態に応じて適正な量となるように、エアフローメータ６の出力値に基づいて吸入空気量のフィードバック制御（以下、吸入空気量フィードバック制御という。）を行う。この吸入空気量フィードバック制御では、内燃機関１の運転状態に対して予め設定された目標新気量と、エアフローメータ６から得られる吸入空気量とが等しくなるように吸気絞り弁５やＥＧＲ弁２５の開度を調整する。 On the other hand, the intake throttle valve 5, the switching valve 24, and the EGR valve 25 are connected to the ECU 10 through electric wiring, and these are controlled by the ECU 10.
In the present embodiment, the intake air is based on the output value of the air flow meter 6 so that the flow rate of the EGR gas flowing into the internal combustion engine 1 becomes an appropriate amount according to the operating state of the internal combustion engine 1 at that time. Perform feedback control of the amount (hereinafter referred to as intake air amount feedback control). In this intake air amount feedback control, the intake throttle valve 5 and the EGR valve 25 are set so that the target fresh air amount preset for the operating state of the internal combustion engine 1 is equal to the intake air amount obtained from the air flow meter 6. Adjust the opening.

ここで、本実施例においては、中負荷時若しくは高負荷時に高い温度のＥＧＲガスを気筒２内に入れるため、ＥＧＲクーラ側通路２７にＥＧＲガスを流す。例えば、アクセル開度センサ１１から得られるアクセル開度が所定開度以上であるならば、ＥＣＵ１０は切替弁２４を操作してＥＧＲクーラ側通路２７にＥＧＲガスを流す。この場合、ＥＧＲクーラ側通路２７を流れるＥＧＲガスの温度が高いので、ＥＧＲガスの熱が蓄熱材２６に伝わると供に、蓄熱材２６に熱が蓄えられる。そして、ＥＧＲガスは、蓄熱材２６に熱を与えた分だけ温度が低下する。すなわち、中負荷時若しくは高負荷時には、蓄熱材２６およびＥＧＲクーラ２３においてＥＧＲガスの温度が低下される。これにより、気筒２内の温度上昇を抑制しつつより多くのＥＧＲガスを気筒２内に入れることができる。   Here, in the present embodiment, the EGR gas is caused to flow through the EGR cooler-side passage 27 in order to put EGR gas having a high temperature into the cylinder 2 at the time of medium load or high load. For example, if the accelerator opening obtained from the accelerator opening sensor 11 is greater than or equal to a predetermined opening, the ECU 10 operates the switching valve 24 to flow EGR gas through the EGR cooler side passage 27. In this case, since the temperature of the EGR gas flowing through the EGR cooler side passage 27 is high, the heat is stored in the heat storage material 26 as the heat of the EGR gas is transmitted to the heat storage material 26. The temperature of the EGR gas is reduced by the amount of heat applied to the heat storage material 26. That is, the temperature of the EGR gas is lowered in the heat storage material 26 and the EGR cooler 23 at the time of medium load or high load. Thereby, more EGR gas can be put into the cylinder 2 while suppressing the temperature rise in the cylinder 2.

一方、本実施例においては、軽負荷時に高い温度のＥＧＲガスを気筒２内に入れるため、バイパス通路２２にＥＧＲガスを流す。例えば、アクセル開度センサ１１から得られるアクセル開度が所定開度よりも小さいときには、ＥＣＵ１０は切替弁２４を操作してバイパス通路２２にＥＧＲガスを流す。この場合、バイパス通路２２を流れるＥＧＲガスの温度が低いので、蓄熱材２６からＥＧＲガスに熱が伝わりＥＧＲガスの温度が上昇する。そして、蓄熱材２６では熱の放出により内部エネルギが減少する。このように、ＥＧＲガスの温度が低い場合には、バイパス通路２２内でＥＧＲガスの温度を上昇させることができ、気筒２内の温度の低下を抑制することができる。   On the other hand, in the present embodiment, the EGR gas is caused to flow through the bypass passage 22 in order to put EGR gas having a high temperature into the cylinder 2 at a light load. For example, when the accelerator opening obtained from the accelerator opening sensor 11 is smaller than a predetermined opening, the ECU 10 operates the switching valve 24 to flow EGR gas into the bypass passage 22. In this case, since the temperature of the EGR gas flowing through the bypass passage 22 is low, heat is transferred from the heat storage material 26 to the EGR gas, and the temperature of the EGR gas rises. And in the thermal storage material 26, internal energy reduces by discharge | release of a heat | fever. As described above, when the temperature of the EGR gas is low, the temperature of the EGR gas can be increased in the bypass passage 22 and a decrease in the temperature in the cylinder 2 can be suppressed.

なお、切替弁２４を切り替えるタイミングは、アクセル開度の他に、機関回転数、排気温度、蓄熱材２６の温度等を考慮して決定してもよい。
以上説明したように、本実施例によれば、ＥＧＲクーラ側通路２７を流れる高温のＥＧＲガスが持つ熱を蓄熱材２６に蓄え、バイパス通路２２を流れる低温のＥＧＲガスへ蓄熱材２６から熱を与えることにより、中負荷若しくは高負荷時にはＥＧＲガスの温度を低下させ、軽負荷時においてはＥＧＲガスの温度を上昇させることができる。これにより、吸気温度の制御が容易となると供に、より多くのＥＧＲガスを気筒２内に入れることができる。 Note that the timing for switching the switching valve 24 may be determined in consideration of the engine speed, the exhaust temperature, the temperature of the heat storage material 26, and the like in addition to the accelerator opening.
As described above, according to the present embodiment, the heat stored in the high temperature EGR gas flowing through the EGR cooler side passage 27 is stored in the heat storage material 26, and the heat from the heat storage material 26 is transferred to the low temperature EGR gas flowing through the bypass passage 22. By providing, the temperature of the EGR gas can be lowered at a medium load or a high load, and the temperature of the EGR gas can be raised at a light load. This makes it easier to control the intake air temperature and allows more EGR gas to enter the cylinder 2.

本実施例においては、実施例１と比較して蓄熱材が異なり、さらに該蓄熱材とバイパス通路およびＥＧＲクーラ側通路との位置関係が異なる。その他のハードウェアについては、実施例１と共通なので説明を省略する。   In the present embodiment, the heat storage material is different from that in the first embodiment, and the positional relationship between the heat storage material, the bypass passage, and the EGR cooler side passage is different. The other hardware is the same as that of the first embodiment, so that the description thereof is omitted.

図２は、本実施例に係る内燃機関の排気循環装置を適用する内燃機関１とその吸・排気系の概略構成を示す図である。また、図３は、本実施例に係る蓄熱材とその周辺部材との関係を示す図である。図３（Ａ）は縦断面図、図３（Ｂ）は横断面図である。   FIG. 2 is a diagram showing a schematic configuration of the internal combustion engine 1 to which the exhaust gas circulation device for the internal combustion engine according to this embodiment is applied and its intake / exhaust system. Moreover, FIG. 3 is a figure which shows the relationship between the thermal storage material which concerns on a present Example, and its peripheral member. 3A is a longitudinal sectional view, and FIG. 3B is a transverse sectional view.

本実施例におけるＥＧＲ装置２００は、ＥＧＲ通路２１、ＥＧＲクーラ側通路１２７、バイパス通路１２２、ＥＧＲクーラ２３、切替弁２４、ＥＧＲ弁２５を備えて構成されている。   The EGR device 200 according to this embodiment includes an EGR passage 21, an EGR cooler side passage 127, a bypass passage 122, an EGR cooler 23, a switching valve 24, and an EGR valve 25.

ＥＧＲ通路２１は、途中でバイパス通路１２２とＥＧＲクーラ側通路１２７とに分岐し、夫々の通路は切替弁２４に接続されている。そして、ＥＧＲクーラ側通路１２７の途中には、ＥＧＲクーラ２３が設けられている。   The EGR passage 21 branches on the way into a bypass passage 122 and an EGR cooler side passage 127, and each passage is connected to the switching valve 24. An EGR cooler 23 is provided in the middle of the EGR cooler side passage 127.

蓄熱材１２６はバイパス通路１２２内を流れるＥＧＲガスに直接晒されるように、バイパス通路１２２内に露出して設けられている。また、バイパス通路１２２の蓄熱材１２６が設けられた箇所は、ＥＧＲクーラ側通路１２７と直交し且つ該ＥＧＲクーラ側通路１２７を貫通して設けられている。すなわち、蓄熱材１２６が設けられた箇所においては、バイパス通路１２２がＥＧＲクーラ側通路１２７の内部を通っている。そして、バイパス通路１２２の蓄熱材１２６が設けられている箇所の外壁、すなわち、ＥＧＲクーラ側通路１２７内を流れるＥＧＲガスに晒されるバイパス通路１２２の外壁面には、ＥＧＲクーラ側通路１２７内に突出する複数のフィン１２８が設けられている。このフィン１２８はバイパス通路１２２の外壁の表面積を大きくして、ＥＧＲガスの熱を蓄熱材１２６に伝えやすくするために設けられている。   The heat storage material 126 is exposed in the bypass passage 122 so as to be directly exposed to the EGR gas flowing in the bypass passage 122. Further, the portion of the bypass passage 122 where the heat storage material 126 is provided is provided orthogonal to the EGR cooler side passage 127 and penetrating through the EGR cooler side passage 127. That is, in the location where the heat storage material 126 is provided, the bypass passage 122 passes through the inside of the EGR cooler side passage 127. Then, the outer wall of the bypass passage 122 where the heat storage material 126 is provided, that is, the outer wall surface of the bypass passage 122 exposed to the EGR gas flowing in the EGR cooler side passage 127 protrudes into the EGR cooler side passage 127. A plurality of fins 128 are provided. The fins 128 are provided to increase the surface area of the outer wall of the bypass passage 122 so that the heat of the EGR gas can be easily transferred to the heat storage material 126.

また、本実施例における蓄熱材１２６は、例えばＣａ（ＯＨ）2／ＣａＯを用いることができる。ここで、Ｃａ（ＯＨ）2に熱を加えると、該Ｃａ（ＯＨ）2からＨ2Ｏが放出されＣａＯに変化する。一方、ＣａＯにＨ2Ｏを加えると、熱を発生しつつＣａ（ＯＨ）2に変化する。 Moreover, the heat storage material 126 in a present Example can use Ca (OH) 2 / CaO, for example. Here, the addition of heat to the Ca (OH) 2, H 2 O is changed to be released CaO from said Ca (OH) 2. On the other hand, when H 2 O is added to CaO, it changes to Ca (OH) 2 while generating heat.

すなわち、ＥＧＲクーラ側通路１２７に高温のＥＧＲガスが流れると、該ＥＧＲガスの熱がフィン１２８およびバイパス通路２２の壁面を伝わりＣａ（ＯＨ）2を熱するため、該Ｃａ（ＯＨ）2からＨ2Ｏが放出されてＣａＯに変化する。このようにして放出されたＨ2Ｏは、バイパス通路１２２内を流れる。これにより、ＥＧＲクーラ側通路１２７を流れるＥＧＲガスの温度が低下されると供に、蓄熱材１２６には熱が蓄えられる。 That is, when the flow is high-temperature EGR gas in the EGR cooler side passage 127, the heat of the EGR gas heat Ca (OH) 2 transmitted through the walls of the fin 128 and the bypass passage 22, from the Ca (OH) 2 H 2 O is released and changes to CaO. The H 2 O released in this way flows in the bypass passage 122. As a result, when the temperature of the EGR gas flowing through the EGR cooler side passage 127 is lowered, heat is stored in the heat storage material 126.

一方、バイパス通路１２２に低温のＥＧＲガスが流れると、該ＥＧＲガス中に含まれるＨ2ＯがＣａＯと反応してＣａ（ＯＨ）2に変化する。このときに発生する熱によりバイパス通路１２２を流れるＥＧＲガスの温度が上昇される。 On the other hand, when low-temperature EGR gas flows through the bypass passage 122, H 2 O contained in the EGR gas reacts with CaO and changes to Ca (OH) 2 . The temperature of the EGR gas flowing through the bypass passage 122 is increased by the heat generated at this time.

以上説明したように、本実施例によれば、化学反応により蓄熱する蓄熱材を備えることにより、高い温度のＥＧＲガスがＥＧＲクーラ側通路１２７を流れたときに、ＥＧＲガスの温度を低下させることができ、低い温度のＥＧＲガスがバイパス通路１２２を流れたときには、ＥＧＲガスの温度を上昇させることができる。   As described above, according to the present embodiment, by providing a heat storage material that stores heat by a chemical reaction, the temperature of the EGR gas is lowered when high-temperature EGR gas flows through the EGR cooler-side passage 127. When the low temperature EGR gas flows through the bypass passage 122, the temperature of the EGR gas can be raised.

本実施例は、バイパス通路２２若しくはＥＧＲクーラ側通路２７と蓄熱材２６との間の熱伝導が、所定の状態のときに限り起こるように構成されている点で実施例１と相違する。その他のハードウェアについては、実施例１と共通なので説明を省略する。   The present embodiment is different from the first embodiment in that the heat conduction between the bypass passage 22 or the EGR cooler side passage 27 and the heat storage material 26 occurs only in a predetermined state. The other hardware is the same as that of the first embodiment, so that the description thereof is omitted.

図４は、本実施例に係る蓄熱材とその周辺部材との関係を示す図である。
バイパス通路２２と蓄熱材２６との間であってバイパス通路２２の外壁には、バイメタル３０が備えられている。このバイメタル３０は、バイパス通路２２を流れるＥＧＲガスが所定の温度以下の場合に蓄熱材２６と接し、ＥＧＲガスの温度が所定の温度よりも高い場合には、蓄熱材２６と離れるように設定されている。そして、この所定の温度は、バイパス通路２２を流れるＥＧＲガスの温度を低下させないように蓄熱材２６の設定温度に応じて定められる。また、バイメタル３０が備わる箇所におけるバイパス通路２２には熱交換器３２が設置されている。この熱交換器３２により、バイパス通路２２を流れるＥＧＲガスとバイメタル３０とで熱交換を行う。 FIG. 4 is a diagram illustrating the relationship between the heat storage material and its peripheral members according to the present embodiment.
A bimetal 30 is provided between the bypass passage 22 and the heat storage material 26 and on the outer wall of the bypass passage 22. The bimetal 30 is set to come into contact with the heat storage material 26 when the EGR gas flowing through the bypass passage 22 is equal to or lower than a predetermined temperature, and away from the heat storage material 26 when the temperature of the EGR gas is higher than the predetermined temperature. ing. The predetermined temperature is determined according to the set temperature of the heat storage material 26 so as not to lower the temperature of the EGR gas flowing through the bypass passage 22. A heat exchanger 32 is installed in the bypass passage 22 where the bimetal 30 is provided. With this heat exchanger 32, heat exchange is performed between the EGR gas flowing through the bypass passage 22 and the bimetal 30.

なお、本実施例においては、バイメタル３０が、本発明におけるバイパス側接続手段に相当する。
一方、ＥＧＲクーラ側通路２７と蓄熱材２６との間であってＥＧＲクーラ側通路２７には、バイメタル３１が備えられている。このバイメタル３１は、ＥＧＲクーラ側通路２７を流れるＥＧＲガスが所定の温度以上の場合に蓄熱材２６と接し、ＥＧＲガスの温度が所定の温度よりも低い場合には、蓄熱材２６と離れるように設定されている。そして、この所定の温度は、ＥＧＲクーラ側通路２７を流れるＥＧＲガスの温度を上昇させないように蓄熱材２６の設定温度に応じて定められる。また、バイメタル３１が備わる箇所におけるＥＧＲクーラ側通路２７には熱交換器３３が設置されている。この熱交換器３３により、ＥＧＲクーラ側通路２７を流れるＥＧＲガスとバイメタル３１とで熱交換を行う。 In this embodiment, the bimetal 30 corresponds to the bypass side connecting means in the present invention.
On the other hand, a bimetal 31 is provided in the EGR cooler side passage 27 between the EGR cooler side passage 27 and the heat storage material 26. The bimetal 31 is in contact with the heat storage material 26 when the EGR gas flowing through the EGR cooler side passage 27 is equal to or higher than a predetermined temperature, and is separated from the heat storage material 26 when the temperature of the EGR gas is lower than the predetermined temperature. Is set. The predetermined temperature is determined according to the set temperature of the heat storage material 26 so as not to raise the temperature of the EGR gas flowing through the EGR cooler side passage 27. In addition, a heat exchanger 33 is installed in the EGR cooler side passage 27 where the bimetal 31 is provided. With this heat exchanger 33, heat exchange is performed between the EGR gas flowing in the EGR cooler side passage 27 and the bimetal 31.

なお、本実施例においては、バイメタル３１が、本発明におけるＥＧＲクーラ側接続手段に相当する。
ここで、バイパス通路２２を流れるＥＧＲガスの温度が、蓄熱材２６の温度よりも高い場合に、該バイパス通路２２と蓄熱材２６とが接していると、ＥＧＲガスから蓄熱材２６に伝熱が起こり、ＥＧＲガスの温度が低下してしまう。これを避けるために、蓄熱材２６の設定温度を高くする（例えば、実施例１の金属基において状態が変化する温度を高く設定する）と、ＥＧＲクーラ側通路２７から蓄熱材２６への伝熱があったとしても、蓄熱材２６の温度を安定させることが困難となり、吸気温度の制御が困難となる。 In this embodiment, the bimetal 31 corresponds to the EGR cooler side connecting means in the present invention.
Here, when the temperature of the EGR gas flowing through the bypass passage 22 is higher than the temperature of the heat storage material 26, if the bypass passage 22 and the heat storage material 26 are in contact with each other, heat transfer from the EGR gas to the heat storage material 26 is performed. Occurs, and the temperature of the EGR gas decreases. In order to avoid this, if the set temperature of the heat storage material 26 is increased (for example, the temperature at which the state changes in the metal base of Example 1 is set high), the heat transfer from the EGR cooler side passage 27 to the heat storage material 26 is performed. Even if there is, it becomes difficult to stabilize the temperature of the heat storage material 26, and it becomes difficult to control the intake air temperature.

ここで、図５は、蓄熱材の設定温度が高いときの該蓄熱材の保持熱量と蓄熱材の温度との関係を示した図である。「バイパス通路のＥＧＲガス温度」で示される範囲は、バイパス通路２２を流れ得るＥＧＲガスの温度の範囲を示している。また、「ＥＧＲクーラ側通路のＥＧＲガス温度」で示される範囲は、ＥＧＲクーラ側通路２７を流れ得るＥＧＲガスの温度の範囲を示している。   Here, FIG. 5 is a diagram showing the relationship between the amount of heat retained by the heat storage material and the temperature of the heat storage material when the set temperature of the heat storage material is high. The range indicated by “EGR gas temperature of the bypass passage” indicates the range of the temperature of EGR gas that can flow through the bypass passage 22. Further, the range indicated by “EGR gas temperature in the EGR cooler side passage” indicates the temperature range of EGR gas that can flow through the EGR cooler side passage 27.

蓄熱材２６の温度が設定温度となると、蓄熱材２６の保持熱量がＡで示した範囲内にある場合には、蓄熱材２６の温度は一定となる。一方、蓄熱材２６の保持熱量が変化して蓄熱材２６の温度が設定温度から外れると、蓄熱材２６の保持熱量が大きくなるほど蓄熱材２６の温度が高くなり、蓄熱材２６の保持熱量が小さくなるほど蓄熱材２６の温度が低くなる。すなわち、蓄熱材２６の温度が設定温度から外れると、蓄熱材２６の保持熱量が変動するとともに、該蓄熱材２６の温度も変動する。   When the temperature of the heat storage material 26 reaches the set temperature, when the amount of heat retained by the heat storage material 26 is within the range indicated by A, the temperature of the heat storage material 26 is constant. On the other hand, when the amount of heat retained by the heat storage material 26 changes and the temperature of the heat storage material 26 deviates from the set temperature, the temperature of the heat storage material 26 increases as the amount of heat retained by the heat storage material 26 increases, and the amount of heat retained by the heat storage material 26 decreases. The temperature of the heat storage material 26 becomes lower. That is, when the temperature of the heat storage material 26 deviates from the set temperature, the amount of heat retained by the heat storage material 26 varies and the temperature of the heat storage material 26 also varies.

そして、蓄熱材２６の設定温度を高くした場合には、「ＥＧＲクーラ側通路のＥＧＲガス温度」の幅の中でも温度の比較的高いＥＧＲガスが流れなければ、蓄熱材２６の温度が設定温度に達しない。そのため、蓄熱材２６の設定温度よりも低い温度のＥＧＲガスがＥＧＲクーラ側通路２７に流れることが多くなり、その結果、蓄熱材２６の温度が上昇せず、該蓄熱材２６の温度がＺで示される範囲にあることが多くなる。これにより、蓄熱材２６の保持熱量とともに蓄熱材２６の温度が変動し、該蓄熱材２６の温度が安定しないおそれがある。これに対し、蓄熱材２６の温度を安定させるために、蓄熱材２６の設定温度を低くすることが考えられる。   When the set temperature of the heat storage material 26 is increased, the temperature of the heat storage material 26 becomes the set temperature if the EGR gas having a relatively high temperature does not flow within the range of the “EGR gas temperature of the EGR cooler side passage”. Not reach. Therefore, EGR gas having a temperature lower than the set temperature of the heat storage material 26 often flows into the EGR cooler side passage 27. As a result, the temperature of the heat storage material 26 does not increase, and the temperature of the heat storage material 26 is Z. It is often in the range shown. Thereby, the temperature of the heat storage material 26 fluctuates together with the amount of heat retained by the heat storage material 26, and the temperature of the heat storage material 26 may not be stable. On the other hand, in order to stabilize the temperature of the heat storage material 26, it is possible to lower the set temperature of the heat storage material 26.

ここで、図６は、蓄熱材の設定温度が低いときの該蓄熱材の保持熱量と蓄熱材の温度との関係を示した図である。
このように、設定温度を低くすると、「ＥＧＲクーラ側通路のＥＧＲガス温度」の幅の中でも温度の比較的低いＥＧＲガスが流れることで蓄熱材２６の温度が設定温度に達する。そのため、蓄熱材２６の温度が設定温度となっている確率が高くなり、吸気温度の制御がしやすくなる。 Here, FIG. 6 is a diagram showing the relationship between the amount of heat retained by the heat storage material and the temperature of the heat storage material when the set temperature of the heat storage material is low.
Thus, when the set temperature is lowered, the temperature of the heat storage material 26 reaches the set temperature by the flow of EGR gas having a relatively low temperature within the range of “EGR gas temperature of the EGR cooler side passage”. Therefore, the probability that the temperature of the heat storage material 26 is the set temperature is increased, and the intake air temperature can be easily controlled.

しかし、設定温度を低くすると、バイパス通路２２を流れるＥＧＲガスの温度が設定温度よりも高くなるおそれがある。すなわち、「バイパス通路のＥＧＲガス温度」の幅の中に蓄熱材２６の設定温度が入っているので、蓄熱材２６の温度がバイパス通路２２を流れるＥＧＲガスの温度よりも低くなることが起こり得る。この場合、バイパス通路２２と蓄熱材２６とが接していると、バイパス通路２２を流れるＥＧＲガスから蓄熱材２６への伝熱が起こり、該ＥＧＲガスの温度が低下してしまうため好ましくない。   However, if the set temperature is lowered, the temperature of the EGR gas flowing through the bypass passage 22 may be higher than the set temperature. That is, since the set temperature of the heat storage material 26 is included in the range of the “EGR gas temperature of the bypass passage”, the temperature of the heat storage material 26 may be lower than the temperature of the EGR gas flowing through the bypass passage 22. . In this case, if the bypass passage 22 and the heat storage material 26 are in contact with each other, heat transfer from the EGR gas flowing through the bypass passage 22 to the heat storage material 26 occurs, and the temperature of the EGR gas is not preferable.

その点、本実施例においては、蓄熱材２６の設定温度を比較的低くしつつ、バイパス通路２２内を流れるＥＧＲガスが蓄熱材２６の設定温度以下の場合に、バイメタル３０と蓄熱材２６とが接するように該バイメタル３０の設定を行っている。すなわち、蓄熱材２６の設定温度を低くすることにより、該蓄熱材２６の温度を設定温度で安定させ、吸気温度を容易に制御することができる。さらに、バイパス通路２２内を流れるＥＧＲガスが蓄熱材２６から熱を受けることができるときに、バイパス通路２２と蓄熱材２６とがバイメタル３０を介して接続されるので、バイパス通路２２においてＥＧＲガスの温度が低下することを抑制できる。   In that respect, in this embodiment, when the EGR gas flowing in the bypass passage 22 is equal to or lower than the set temperature of the heat storage material 26 while the set temperature of the heat storage material 26 is relatively low, the bimetal 30 and the heat storage material 26 are The bimetal 30 is set so as to come into contact. That is, by lowering the set temperature of the heat storage material 26, the temperature of the heat storage material 26 can be stabilized at the set temperature, and the intake air temperature can be easily controlled. Further, when the EGR gas flowing in the bypass passage 22 can receive heat from the heat storage material 26, the bypass passage 22 and the heat storage material 26 are connected via the bimetal 30. It can suppress that temperature falls.

そして、本実施例においては、ＥＧＲクーラ側通路２７と蓄熱材２６との間にもバイメタル３１を備えている。ここで、本実施例のように設定温度を低くすると、ＥＧＲクーラ側通路２７を流れるＥＧＲガスの温度が設定温度よりも低くなるおそれがある。すなわち、蓄熱材２６の温度がＥＧＲクーラ側通路２７を流れるＥＧＲガスの温度よりも高くなる
ことが起こり得る。この場合、ＥＧＲクーラ側通路２７と蓄熱材２６とが接していると、蓄熱材２６からＥＧＲクーラ側通路２７を流れるＥＧＲガスへの伝熱が起こり、該ＥＧＲガスの温度が上昇してしまうため好ましくない。 In this embodiment, a bimetal 31 is also provided between the EGR cooler side passage 27 and the heat storage material 26. Here, if the set temperature is lowered as in the present embodiment, the temperature of the EGR gas flowing through the EGR cooler side passage 27 may be lower than the set temperature. That is, the temperature of the heat storage material 26 may be higher than the temperature of the EGR gas flowing through the EGR cooler side passage 27. In this case, if the EGR cooler-side passage 27 and the heat storage material 26 are in contact, heat transfer from the heat storage material 26 to the EGR gas flowing through the EGR cooler-side passage 27 occurs, and the temperature of the EGR gas increases. It is not preferable.

その点、本実施例においては、蓄熱材２６の設定温度を比較的低くしつつ、ＥＧＲクーラ側通路２７内を流れるＥＧＲガスが蓄熱材２６の設定温度以上の場合に、バイメタル３１と蓄熱材２６とが接するように該バイメタル３１の設定を行っている。すなわち、ＥＧＲクーラ側通路２７内を流れるＥＧＲガスが蓄熱材２６へ熱を与えることができるときに、ＥＧＲクーラ側通路２７と蓄熱材２６とがバイメタル３１を介して接続されるので、ＥＧＲクーラ側通路２７においてＥＧＲガスの温度が上昇することを抑制できる。   In this regard, in this embodiment, when the EGR gas flowing in the EGR cooler-side passage 27 is equal to or higher than the set temperature of the heat storage material 26 while the set temperature of the heat storage material 26 is relatively low, the bimetal 31 and the heat storage material 26. The bimetal 31 is set so as to be in contact with each other. That is, when the EGR gas flowing through the EGR cooler-side passage 27 can give heat to the heat storage material 26, the EGR cooler-side passage 27 and the heat storage material 26 are connected via the bimetal 31, so the EGR cooler side An increase in the temperature of the EGR gas in the passage 27 can be suppressed.

なお、本実施例においては、蓄熱材２６とバイパス通路２２もしくはＥＧＲクーラ側通路２７との間にバイメタル３０，３１を備えているが、これに代えて、温度応じて変形する他の部材、例えば、ワックス、形状記憶合金を含んで構成された部材を備えていてもよい。また、温度センサによりＥＧＲガスの温度を検出し、所定の温度となった場合に作動して蓄熱材２６とバイパス通路２２もしくはＥＧＲクーラ側通路２７とを接触させる装置を備えるようにしてもよい。   In the present embodiment, the bimetals 30 and 31 are provided between the heat storage material 26 and the bypass passage 22 or the EGR cooler side passage 27, but instead of this, other members that deform according to the temperature, for example, In addition, a member including a wax and a shape memory alloy may be provided. Further, a temperature sensor may be used to detect the temperature of the EGR gas, and a device that operates when the temperature reaches a predetermined temperature to contact the heat storage material 26 and the bypass passage 22 or the EGR cooler-side passage 27 may be provided.

以上説明したように、本実施例によれば、蓄熱材２６の設定温度を低くすることができるので、該蓄熱材２６の保持熱量の変化に伴う蓄熱材２６の温度の変化を抑制することができ、ＥＧＲガスの温度を安定させることができる。そのため、吸気温度を安定させることができる。   As described above, according to the present embodiment, since the set temperature of the heat storage material 26 can be lowered, it is possible to suppress the temperature change of the heat storage material 26 due to the change in the amount of heat retained by the heat storage material 26. And the temperature of the EGR gas can be stabilized. Therefore, the intake air temperature can be stabilized.

本実施例においては、ＥＧＲクーラ側通路２７、蓄熱材２６、バイパス通路２２の順にのみ熱が移動する構成とする。その他のハードウェアについては、実施例１と共通なので説明を省略する。   In this embodiment, heat is transferred only in the order of the EGR cooler side passage 27, the heat storage material 26, and the bypass passage 22. The other hardware is the same as that of the first embodiment, so that the description thereof is omitted.

図７は、本実施例に係る蓄熱材とその周辺部材との関係を示す断面図である。
本実施例においては、ＥＧＲクーラ側通路２７と蓄熱材２６との間にヒートパイプ４０を備え、バイパス通路２２と蓄熱材２６との間にヒートパイプ４１を備えている。すなわち、ヒートパイプ４０の一端側がＥＧＲクーラ側通路２７と接し、該ヒートパイプ４０の他端側が蓄熱材２６と接している。また、ヒートパイプ４１の一端側が蓄熱材２６と接し、該ヒートパイプ４１の他端側がバイパス通路２２と接している。なお、ヒートパイプ４０において熱の移動を行うために、ＥＧＲクーラ側通路２７のヒートパイプ４０が接続されている箇所よりも、蓄熱材２６のヒートパイプ４０が接続されている箇所の方が高い位置となるようにＥＧＲクーラ側通路２７および蓄熱材２６が設置されている。同様に、蓄熱材２６のヒートパイプ４１が接続されている箇所よりも、バイパス通路２２のヒートパイプ４１が接続されている箇所の方が高い位置となるようにバイパス通路２２および蓄熱材２６が設置されている。 FIG. 7 is a cross-sectional view showing the relationship between the heat storage material according to the present embodiment and its peripheral members.
In this embodiment, a heat pipe 40 is provided between the EGR cooler side passage 27 and the heat storage material 26, and a heat pipe 41 is provided between the bypass passage 22 and the heat storage material 26. That is, one end side of the heat pipe 40 is in contact with the EGR cooler side passage 27, and the other end side of the heat pipe 40 is in contact with the heat storage material 26. Further, one end side of the heat pipe 41 is in contact with the heat storage material 26, and the other end side of the heat pipe 41 is in contact with the bypass passage 22. In addition, in order to move heat in the heat pipe 40, the position where the heat pipe 40 of the heat storage material 26 is connected is higher than the position where the heat pipe 40 of the EGR cooler side passage 27 is connected. The EGR cooler side passage 27 and the heat storage material 26 are installed so as to be. Similarly, the bypass passage 22 and the heat storage material 26 are installed so that the location where the heat pipe 41 of the bypass passage 22 is connected is higher than the location where the heat pipe 41 of the heat storage material 26 is connected. Has been.

すなわち、ＥＧＲクーラ側通路２７の温度が蓄熱材２６の温度よりも高い場合には、ヒートパイプ４０の下部がＥＧＲガスの熱により温められ、作動流体が蒸発する。この蒸発の際にＥＧＲガスの温度が低下する。そして、蒸発した作動流体はヒートパイプ４０の上部へと移動し、該ヒートパイプ４０の上部において蓄熱材２６により冷却されて凝縮する。この凝縮の際に潜熱が放出され、蓄熱材２６の温度が上昇する。そして、凝縮した作動流体は、ヒートパイプ下部に移動して再び加熱され蒸発する。この過程が繰り返し行われ、ＥＧＲクーラ側通路２７を流れるＥＧＲガスの熱が蓄熱材２６に移動する。また、バイパス通路２２と蓄熱材２６との間でも同様にして熱の移動が行われる。   That is, when the temperature of the EGR cooler side passage 27 is higher than the temperature of the heat storage material 26, the lower part of the heat pipe 40 is warmed by the heat of the EGR gas, and the working fluid evaporates. During this evaporation, the temperature of the EGR gas decreases. The evaporated working fluid moves to the upper part of the heat pipe 40, and is cooled and condensed by the heat storage material 26 in the upper part of the heat pipe 40. During this condensation, latent heat is released, and the temperature of the heat storage material 26 rises. The condensed working fluid moves to the lower part of the heat pipe and is heated again to evaporate. This process is repeated, and the heat of the EGR gas flowing through the EGR cooler side passage 27 moves to the heat storage material 26. Further, heat is transferred in the same manner between the bypass passage 22 and the heat storage material 26.

一方、ＥＧＲクーラ側通路２７の温度が蓄熱材２６の温度よりも低い場合には、ヒートパイプ４０において熱の移動がほとんどないので、ＥＧＲクーラ側通路２７を流れるＥＧＲガスの温度が蓄熱材２６により上昇されることはほとんどない。バイパス通路２２と蓄熱材２６との間でも同様に、バイパス通路２２を流れるＥＧＲガスの温度が蓄熱材２６により低下されることはほとんどない。   On the other hand, when the temperature of the EGR cooler side passage 27 is lower than the temperature of the heat storage material 26, there is almost no movement of heat in the heat pipe 40, so the temperature of the EGR gas flowing through the EGR cooler side passage 27 is reduced by the heat storage material 26. It is rarely raised. Similarly, between the bypass passage 22 and the heat storage material 26, the temperature of the EGR gas flowing through the bypass passage 22 is hardly lowered by the heat storage material 26.

また、ＥＧＲクーラ側通路２７を流れるＥＧＲガスの温度が蓄熱材２６の温度よりも少しでも高ければ、若しくは蓄熱材２６の温度がバイパス通路２２を流れるＥＧＲガスの温度よりも少しでも高ければ熱の移動が起こるため、より広範囲の運転条件において実際の吸気温度を目標吸気温度に合わせることができる。   Further, if the temperature of the EGR gas flowing through the EGR cooler side passage 27 is slightly higher than the temperature of the heat storage material 26, or if the temperature of the heat storage material 26 is slightly higher than the temperature of the EGR gas flowing through the bypass passage 22, Since the movement occurs, the actual intake air temperature can be adjusted to the target intake air temperature in a wider range of operating conditions.

実施例１に係る内燃機関の排気循環装置を適用する内燃機関とその吸・排気系の概略構成を示す図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a schematic configuration of an internal combustion engine to which an exhaust gas circulation device for an internal combustion engine according to a first embodiment is applied and an intake / exhaust system thereof. 実施例２に係る内燃機関の排気循環装置を適用する内燃機関とその吸・排気系の概略構成を示す図である。It is a figure which shows schematic structure of the internal combustion engine which applies the exhaust-gas-circulation apparatus of the internal combustion engine which concerns on Example 2, and its intake / exhaust system. 実施例２に係る蓄熱材とその周辺部材との関係を示す図である。図３（Ａ）は縦断面図、図３（Ｂ）は横断面図である。It is a figure which shows the relationship between the thermal storage material which concerns on Example 2, and its peripheral member. 3A is a longitudinal sectional view, and FIG. 3B is a transverse sectional view. 実施例３に係る蓄熱材とその周辺部材との関係を示す図である。It is a figure which shows the relationship between the thermal storage material which concerns on Example 3, and its peripheral member. 蓄熱材の設定温度が高いときの該蓄熱材の保持熱量と蓄熱材の温度との関係を示した図である。It is the figure which showed the relationship between the amount of heat retention of this thermal storage material when the preset temperature of a thermal storage material is high, and the temperature of a thermal storage material. 蓄熱材の設定温度が低いときの該蓄熱材の保持熱量と蓄熱材の温度との関係を示した図である。It is the figure which showed the relationship between the amount of heat retention of this thermal storage material when the preset temperature of a thermal storage material is low, and the temperature of a thermal storage material. 実施例４に係る蓄熱材とその周辺部材との関係を示す図である。It is a figure which shows the relationship between the thermal storage material which concerns on Example 4, and its peripheral member.

符号の説明Explanation of symbols

１ 内燃機関
２ 気筒
３ 吸気通路
４ ターボチャージャ
４ａ コンプレッサハウジング
４ｂ タービンハウジング
５ 吸気絞り弁
６ エアフローメータ
７ 排気通路
１０ ＥＣＵ
１１ アクセル開度センサ
２０ ＥＧＲ装置
２１ ＥＧＲ通路
２２ バイパス通路
２３ ＥＧＲクーラ
２４ 切替弁
２５ ＥＧＲ弁
２６ 蓄熱材
２７ ＥＧＲクーラ側通路
３０ バイメタル
３１ バイメタル
３２ 熱交換器
３３ 熱交換器
４０ ヒートパイプ
４１ ヒートパイプ
１２２ バイパス通路
１２６ 蓄熱材
１２７ ＥＧＲクーラ側通路
１２８ フィン
２００ ＥＧＲ装置 DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Cylinder 3 Intake passage 4 Turbocharger 4a Compressor housing 4b Turbine housing 5 Intake throttle valve 6 Air flow meter 7 Exhaust passage 10 ECU
11 accelerator opening sensor 20 EGR device 21 EGR passage 22 bypass passage 23 EGR cooler 24 switching valve 25 EGR valve 26 heat storage material 27 EGR cooler side passage 30 bimetal 31 bimetal 32 heat exchanger 33 heat exchanger 40 heat pipe 41 heat pipe 122 Bypass passage 126 Heat storage material 127 EGR cooler side passage 128 Fin 200 EGR device

Claims (9)

ＥＧＲガスの温度を低下させるＥＧＲクーラと、
前記ＥＧＲクーラが備えられるＥＧＲクーラ側通路と、
前記ＥＧＲクーラを迂回するバイパス通路と、
前記ＥＧＲクーラ側通路および前記バイパス通路に流れるＥＧＲガスの量を調整する切替弁と、
前記ＥＧＲクーラ側通路を流れるＥＧＲガスと熱交換し、且つ前記バイパス通路を流れるＥＧＲガスと熱交換する蓄熱手段と、
を具備することを特徴とする内燃機関の排気循環装置。 An EGR cooler that lowers the temperature of the EGR gas;
An EGR cooler side passage provided with the EGR cooler;
A bypass passage that bypasses the EGR cooler;
A switching valve for adjusting the amount of EGR gas flowing through the EGR cooler side passage and the bypass passage;
Heat storage means for exchanging heat with the EGR gas flowing through the EGR cooler side passage and with the EGR gas flowing through the bypass passage;
An exhaust gas circulation device for an internal combustion engine, comprising: 前記蓄熱手段は、バイパス通路内に設けられ化学反応により蓄熱する蓄熱材からなることを特徴とする請求項１に記載の内燃機関の排気循環装置。   The exhaust heat circulating apparatus for an internal combustion engine according to claim 1, wherein the heat storage means is made of a heat storage material that is provided in the bypass passage and stores heat by a chemical reaction. 第１所定条件が成立したときに、前記バイパス通路を通過するＥＧＲガスに対して前記蓄熱手段が熱を与えることを特徴とする請求項１に記載の内燃機関の排気循環装置。   2. The exhaust gas recirculation device for an internal combustion engine according to claim 1, wherein when the first predetermined condition is satisfied, the heat storage means applies heat to the EGR gas passing through the bypass passage. 前記第１所定条件とは、前記バイパス通路を通過するＥＧＲガスが第１所定温度以下のときであることを特徴とする請求項３に記載の内燃機関の排気循環装置。   4. The exhaust gas recirculation device for an internal combustion engine according to claim 3, wherein the first predetermined condition is when EGR gas passing through the bypass passage is equal to or lower than a first predetermined temperature. 5. 第２所定条件が成立したときに、前記ＥＧＲクーラ側通路に流入するＥＧＲガスから前記蓄熱手段が熱を受けることを特徴とする請求項１に記載の内燃機関の排気循環装置。   2. The exhaust gas recirculation apparatus for an internal combustion engine according to claim 1, wherein the heat storage means receives heat from EGR gas flowing into the EGR cooler side passage when the second predetermined condition is satisfied. 前記第２所定条件とは、前記ＥＧＲクーラ側通路に流入するＥＧＲガスが第２所定温度以上のときであることを特徴とする請求項５に記載の内燃機関の排気循環装置。   6. The exhaust gas recirculation device for an internal combustion engine according to claim 5, wherein the second predetermined condition is when EGR gas flowing into the EGR cooler side passage is equal to or higher than a second predetermined temperature. 前記バイパス通路を流れるＥＧＲガスの温度が第１所定温度以下のときに前記バイパス通路と前記蓄熱手段とを接続するバイパス側接続手段をさらに備えることを特徴とする請求項３または４に記載の内燃機関の排気循環装置。   5. The internal combustion engine according to claim 3, further comprising a bypass side connection unit that connects the bypass channel and the heat storage unit when the temperature of the EGR gas flowing through the bypass channel is equal to or lower than a first predetermined temperature. Engine exhaust circulation system. 前記ＥＧＲクーラ側通路を流れるＥＧＲガスの温度が第２所定温度以上のときに前記ＥＧＲクーラ側通路と前記蓄熱手段とを接続するＥＧＲクーラ側接続手段をさらに備えることを特徴とする請求項５または６に記載の内燃機関の排気循環装置。   The EGR cooler-side connecting means for connecting the EGR cooler-side path and the heat storage means when the temperature of the EGR gas flowing through the EGR cooler-side path is equal to or higher than a second predetermined temperature. 6. An exhaust gas circulation device for an internal combustion engine according to 6. 前記蓄熱手段は、前記ＥＧＲクーラ側通路を流れるＥＧＲガスおよび前記バイパス通路を流れるＥＧＲガスとヒートパイプを介して熱交換することを特徴とする請求項１に記載の内燃機関の排気循環装置。   2. The exhaust gas recirculation apparatus for an internal combustion engine according to claim 1, wherein the heat storage unit exchanges heat with an EGR gas flowing through the EGR cooler side passage and an EGR gas flowing through the bypass passage via a heat pipe.
JP2004311050A 2004-10-26 2004-10-26 Exhaust gas recirculation device for internal combustion engine Withdrawn JP2006125215A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7621128B2 (en) * 2005-12-02 2009-11-24 Borgwarner Inc. Combined EGR valve and cooler by-pass
JP2009299536A (en) * 2008-06-11 2009-12-24 Sanoh Industrial Co Ltd Egr cooler
JP2017129080A (en) * 2016-01-21 2017-07-27 株式会社豊田中央研究所 Exhaust gas circulation system
EP3499014A1 (en) 2017-12-14 2019-06-19 Toyota Jidosha Kabushiki Kaisha Exhaust gas recirculation cooler
US10767539B2 (en) 2018-04-25 2020-09-08 Ford Global Technologies, Llc Arrangement and method for tempering exhaust gas recirculation devices, and motor vehicle

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7621128B2 (en) * 2005-12-02 2009-11-24 Borgwarner Inc. Combined EGR valve and cooler by-pass
JP2009299536A (en) * 2008-06-11 2009-12-24 Sanoh Industrial Co Ltd Egr cooler
JP2017129080A (en) * 2016-01-21 2017-07-27 株式会社豊田中央研究所 Exhaust gas circulation system
EP3499014A1 (en) 2017-12-14 2019-06-19 Toyota Jidosha Kabushiki Kaisha Exhaust gas recirculation cooler
JP2019105257A (en) * 2017-12-14 2019-06-27 トヨタ自動車株式会社 EGR cooler
RU2696717C1 (en) * 2017-12-14 2019-08-05 Тойота Дзидося Кабусики Кайся Exhaust gas recirculation system cooler
US10563623B2 (en) 2017-12-14 2020-02-18 Toyota Jidosha Kabushiki Kaisha Exhaust gas recirculation cooler
US10767539B2 (en) 2018-04-25 2020-09-08 Ford Global Technologies, Llc Arrangement and method for tempering exhaust gas recirculation devices, and motor vehicle

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