JP6790723B2 - Internal combustion engine - Google Patents

Internal combustion engine Download PDF

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JP6790723B2
JP6790723B2 JP2016209892A JP2016209892A JP6790723B2 JP 6790723 B2 JP6790723 B2 JP 6790723B2 JP 2016209892 A JP2016209892 A JP 2016209892A JP 2016209892 A JP2016209892 A JP 2016209892A JP 6790723 B2 JP6790723 B2 JP 6790723B2
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cooling water
water
temperature side
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temperature
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伸匡 大橋
伸匡 大橋
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Isuzu Motors Ltd
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    • 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
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    • Y02T10/12—Improving ICE efficiencies

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Description

本発明は、内燃機関に関する。 The present invention relates to an internal combustion engine.

エンジン冷却水が流通する高温側冷却水路にメインラジエータと高温側冷却水用のポンプを備えるとともに、水冷インタークーラを冷却した後の冷却水が流通する低温側冷却水路にサブラジエータと低温側冷却水用のポンプとを備えて構成される内燃機関の冷却装置が提案されている（例えば、特許文献１参照）。 A main radiator and a pump for high-temperature side cooling water are provided in the high-temperature side cooling water channel through which engine cooling water flows, and a sub-radiator and low-temperature side cooling water are provided in the low-temperature side cooling water channel through which cooling water flows after cooling the water-cooled intercooler. A cooling device for an internal combustion engine configured to include a pump for the purpose has been proposed (see, for example, Patent Document 1).

特開２０１２−１８９０６３号公報Japanese Unexamined Patent Publication No. 2012-189063

ところで、車両の燃費性能及び排ガス性能の良化の観点から、排気通路から吸気通路に還流される排気ガス（ＥＧＲガス）の低温化が検討されている。しかしながら、従来のように、ＥＧＲガスを冷却するＥＧＲクーラの冷却媒体として、内燃機関の冷却により比較的高温となるエンジン冷却水を使用していたのでは、ＥＧＲガスの更なる低温化を達成するのは困難であった。 By the way, from the viewpoint of improving the fuel efficiency and exhaust gas performance of the vehicle, lowering the temperature of the exhaust gas (EGR gas) returned from the exhaust passage to the intake passage is being studied. However, if engine cooling water, which becomes relatively high temperature due to the cooling of the internal combustion engine, is used as the cooling medium of the EGR cooler for cooling the EGR gas as in the conventional case, the EGR gas can be further lowered in temperature. Was difficult.

本発明の目的は、ＥＧＲガスの更なる低温化を達成して、車両の燃費性能及び排ガス性能を良化させることができる内燃機関を提供することにある。 An object of the present invention is to provide an internal combustion engine capable of achieving further temperature reduction of EGR gas and improving fuel efficiency and exhaust gas performance of a vehicle.

上記の目的を達成するための本発明の内燃機関は、内燃機関の冷却を行う高温側冷却水が流通する高温側冷却水用流路に高水温用ラジエータと高水温用送水装置を備えるとともに、前記内燃機関の吸気通路を通過する吸気ガスの冷却を行う低温側冷却水が流通する低温側冷却水用流路に低水温用ラジエータと低水温用送水装置を備えて構成される内燃機関において、前記低温側冷却水用流路の前記低水温用ラジエータよりも下流側に配置されて前記吸気通路を通過する吸気ガスの冷却を前記低温側冷却水にて行うインタークーラと、このインタークーラよりも下流側に配置されて前記内燃機関の排気通路から前記吸気通路に還流されるＥＧＲガスの冷却を行うＥＧＲクーラとを備えるとともに、前記インタークーラと前記ＥＧＲクーラの間の前記低温側冷却水用流路に、前記高温側冷却水用流路より分岐した分岐流路を接続して、前記インタークーラを通過した低温側冷却水と前記分岐流路を通過した高温側冷却水が混合された混合冷却水を前記ＥＧＲクーラに流通させるように構成される。 The internal combustion engine of the present invention for achieving the above object is provided with a radiator for high water temperature and a water supply device for high water temperature in the flow path for cooling water on the high temperature side through which the cooling water on the high temperature side for cooling the internal combustion engine flows. In an internal combustion engine configured by providing a radiator for low water temperature and a water supply device for low water temperature in a flow path for cooling water on the low temperature side through which cooling water on the low temperature side for cooling the intake gas passing through the intake passage of the internal combustion engine flows. An internal combustion engine arranged downstream of the low water temperature radiator of the low temperature side cooling water flow path and cooling the intake gas passing through the intake passage with the low temperature side cooling water, and an internal combustion engine. An EGR cooler that is arranged on the downstream side and cools the EGR gas that is returned from the exhaust passage of the internal combustion engine to the intake passage is provided, and the flow for the low temperature side cooling water between the intercooler and the EGR cooler. A branch flow path branched from the high temperature side cooling water flow path is connected to the path, and mixed cooling is a mixture of low temperature side cooling water that has passed through the intercooler and high temperature side cooling water that has passed through the branch flow path. It is configured to allow water to flow through the EGR cooler.

本発明の内燃機関によれば、エンジン冷却水（高温側冷却水）と吸気ガス冷却用の低温側冷却水を混合して、エンジン冷却水より低温の混合冷却水を冷却媒体としてＥＧＲクーラに流通させるので、エンジン冷却水を冷却媒体とする従来技術と比較して、ＥＧＲガスを更に低温化することができる。その結果、気筒内に流入される吸気とＥＧＲガスの混合気を低体積化して車両の燃費性能を良化させることができるとともに、混合気を低温化して排ガス性能を良化させることができる。 According to the internal combustion engine of the present invention, engine cooling water (high temperature side cooling water) and low temperature side cooling water for cooling intake gas are mixed and distributed to an EGR cooler using the mixed cooling water lower than the engine cooling water as a cooling medium. Therefore, the temperature of the EGR gas can be further lowered as compared with the conventional technique in which the engine cooling water is used as the cooling medium. As a result, the volume of the air-fuel mixture flowing into the cylinder and the EGR gas can be reduced to improve the fuel efficiency of the vehicle, and the temperature of the air-fuel mixture can be lowered to improve the exhaust gas performance.

また、ＥＧＲクーラの冷却媒体として低温側冷却水を用いることなく、低温側冷却水より高温の混合冷却水を用いるので、ＥＧＲガスに含まれる水蒸気の凝縮化による凝縮水（腐食水）の生成を抑制することができる。その結果、凝縮水による各種配管及びバルブ等の腐食や劣化を抑制することができる。 Further, since the mixed cooling water having a higher temperature than the low temperature side cooling water is used as the cooling medium of the EGR cooler, the condensed water (corrosive water) is generated by condensing the water vapor contained in the EGR gas. It can be suppressed. As a result, corrosion and deterioration of various pipes and valves due to condensed water can be suppressed.

本発明の内燃機関の構成を模式的に示す図である。It is a figure which shows typically the structure of the internal combustion engine of this invention. 第１逆止弁及び第２逆止弁を備えた場合における、図１のＡ点及びＢ点の水温及び水量の推移等を示す図である。It is a figure which shows the transition of the water temperature and the amount of water of the point A and the point B of FIG. 1 in the case where the 1st check valve and the 2nd check valve are provided. 高温側冷却水が低温側冷却水用流路に流入した場合における、図１のＡ点及びＢ点の水温及び水量の推移等を示す図である。It is a figure which shows the transition of the water temperature and the amount of water of points A and B of FIG. 1 when the high temperature side cooling water flows into the low temperature side cooling water flow path. 低温側冷却水が高温側冷却水用流路に流入した場合における、図１のＡ点及びＢ点の水温及び水量の推移等を示す図である。It is a figure which shows the transition of the water temperature and the amount of water of points A and B of FIG. 1 when the low temperature side cooling water flows into the high temperature side cooling water flow path.

以下、本発明に係る実施の形態の内燃機関について、図面を参照しながら説明する。図１に示すように、本発明の内燃機関には高温側冷却水用流路（太線）と低温側冷却水用流路（細線）が備わる。 Hereinafter, the internal combustion engine of the embodiment according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the internal combustion engine of the present invention is provided with a high temperature side cooling water flow path (thick line) and a low temperature side cooling water flow path (thin line).

高温側冷却水用流路は、エンジン（内燃機関）１０の冷却を行う高温側冷却水（エンジン冷却水）ＨＷが流通する流路で、上流側より順に、エンジン１０、サーモスタット１３、高水温用ラジエータ１１、高水温用ウォーターポンプ（高水温用送水装置）１２が備わる。高水温用ラジエータ１１は、エンジン１０を通過後の高温側冷却水ＨＷを車両の内部に流入する空気により冷却する装置である。高水温用ウォーターポンプ１２は、高温側冷却水用流路を循環させるためのエネルギーを高温側冷却水ＨＷに供給する装置である。この高水温用ウォーターポンプ１２の駆動源は、エンジン１０の動力でもよいし、車両の内部にバッテリ（図示しない）を備えて、このバッテリの電力でもよい。サーモスタット１３は、エンジン１０を通過後の高温側冷却水ＨＷの温度に応じて、高温側冷却水ＨＷを高水温用ラジエータ１１で冷却するか否かを設定することで、高温側冷却水ＨＷの温度を調整する開閉弁装置である。より詳細には、サーモスタット１３を通過する高温側冷却水ＨＷの温度が予め設定された設定温度未満のときには、サーモスタット１３は閉弁状態となって、エンジン１０を通過後の高温側冷却水ＨＷが高水温用ラジエータ１１を経由することなくバイパス通路（図示しない）を経由して再びエンジン１０に流入するようにして、エンジン１０の暖機を促進する。一方、高温側冷却水ＨＷの温度が設定温度以上のときには、サーモスタット１３は開弁状態となって、エンジン１０を通過後の高温側冷却水ＨＷが高水温用ラジエータ１１を経由して再びエンジン１０に流入するようにして、高温側冷却水ＨＷの温度を一定の範囲内に維持しながら、エンジン１０を冷却する。なお、サーモスタット１３の開弁度は、通常、サーモスタット１３の温度と設定温度の差（＝サーモスタット１３の温度−設定温度）が大きくなるにつれて、大きくなるように設定する。 The high-temperature side cooling water flow path is a flow path through which the high-temperature side cooling water (engine cooling water) HW that cools the engine (internal combustion engine) 10 flows, and the engine 10, thermostat 13, and high water temperature are used in this order from the upstream side. A radiator 11 and a high water temperature water pump (high water temperature water supply device) 12 are provided. The high water temperature radiator 11 is a device that cools the high temperature side cooling water HW after passing through the engine 10 by the air flowing into the inside of the vehicle. The high water temperature water pump 12 is a device that supplies energy for circulating the high temperature side cooling water flow path to the high temperature side cooling water HW. The drive source of the high water temperature water pump 12 may be the power of the engine 10 or the electric power of a battery (not shown) provided inside the vehicle. The thermostat 13 sets whether or not the high temperature side cooling water HW is cooled by the high water temperature radiator 11 according to the temperature of the high temperature side cooling water HW after passing through the engine 10. It is an on-off valve device that regulates the temperature. More specifically, when the temperature of the high temperature side cooling water HW passing through the thermostat 13 is lower than the preset set temperature, the thermostat 13 is closed and the high temperature side cooling water HW after passing through the engine 10 is released. The engine 10 is warmed up by allowing the engine 10 to flow into the engine 10 again via a bypass passage (not shown) without passing through the high water temperature radiator 11. On the other hand, when the temperature of the high temperature side cooling water HW is equal to or higher than the set temperature, the thermostat 13 is opened, and the high temperature side cooling water HW after passing through the engine 10 passes through the high water temperature radiator 11 again to the engine 10. The engine 10 is cooled while maintaining the temperature of the high-temperature side cooling water HW within a certain range. The valve opening degree of the thermostat 13 is usually set to increase as the difference between the temperature of the thermostat 13 and the set temperature (= temperature of the thermostat 13-set temperature) increases.

低温側冷却水用流路は、エンジン１０の吸気通路を通過する吸気ガスの冷却を行う低温側冷却水ＬＷが流通する流路で、上流側より順に、低水温用ラジエータ２１、低水温用ウォーターポンプ（低水温用送水装置）２２、インタークーラ（チャージエアクーラ）２３が備わる。低水温用ラジエータ２１は、インタークーラ２３を通過後の低温側冷却水ＬＷを車両の内部に流入する空気により冷却する装置である。低水温用ウォーターポンプ２２は、低温側冷却水用流路を循環させるためのエネルギーを低温側冷却水ＬＷに供給する装置である。この低水温用ウォーターポンプ２２の駆動源は、エンジン１０の動力でもよいし、車両の内部にバッテリ（図示しない）を備えて、このバッテリの電力でもよい。インタークーラ２３は、吸気通路に備わり、吸気通路を通過する吸気ガスの冷却を低温側冷却水用流路を通過する低温側冷却水ＬＷを冷却媒体として行う装置である。なお、上記した各装置１１、１２、１３、２１、２２、２３、２４に対する冷却水の流入出口にはホースが接続され、このホースに例えば鋼製の配管を接続して、冷却水回路を構成している。図１では、一例として、低水温用ラジエータ２１の流出口に接続されるホース２１ａのみを図示し、その他のホースは省略している。 The low-temperature side cooling water flow path is a flow path through which the low-temperature side cooling water LW that cools the intake gas passing through the intake passage of the engine 10 flows, and the low water temperature radiator 21 and the low water temperature water flow in this order from the upstream side. It is equipped with a pump (water supply device for low water temperature) 22 and an intercooler (charge air cooler) 23. The low water temperature radiator 21 is a device that cools the low temperature side cooling water LW after passing through the intercooler 23 by the air flowing into the inside of the vehicle. The low water temperature water pump 22 is a device that supplies energy for circulating the low temperature side cooling water flow path to the low temperature side cooling water LW. The drive source of the low water temperature water pump 22 may be the power of the engine 10 or the electric power of a battery (not shown) provided inside the vehicle. The intercooler 23 is a device provided in the intake passage and cools the intake gas passing through the intake passage by using the low temperature side cooling water LW passing through the low temperature side cooling water flow path as a cooling medium. A hose is connected to the inflow / outlet of the cooling water for each of the above-mentioned devices 11, 12, 13, 21, 22, 23, 24, and a steel pipe is connected to this hose to form a cooling water circuit. doing. In FIG. 1, as an example, only the hose 21a connected to the outlet of the low water temperature radiator 21 is illustrated, and the other hoses are omitted.

また、本発明の内燃機関には、制御装置４０が備わる。制御装置４０は、サーモスタット１３による温度の検出値に応じて、高水温用ウォーターポンプ１２を制御したり、エンジン回転数や気筒内への燃料噴射量等のエンジン運転状態を表すパラメータの検出値または推定値に応じて、低水温用ウォーターポンプ２２を制御したりする装置である。 Further, the internal combustion engine of the present invention is provided with a control device 40. The control device 40 controls the water pump 12 for high water temperature according to the temperature detection value by the thermostat 13, or is a detection value of a parameter representing an engine operating state such as an engine speed or a fuel injection amount into a cylinder. It is a device that controls the low water temperature water pump 22 according to the estimated value.

本発明の内燃機関では、排気通路から吸気通路に還流される排気ガス（ＥＧＲガス）を冷却するＥＧＲクーラ２４をＥＧＲ通路（図示しない）に備えて、このＥＧＲクーラ２４を低温側冷却水用流路が通過するように構成するとともに、ＥＧＲクーラ２４より上流側の低温側冷却水用流路に、高温側冷却水用流路より分岐した分岐流路３０を接続する。そして、低温側冷却水用流路と分岐流路３０の接続点ＣＰとＥＧＲクーラ２４との間の流路を通過する冷却水を、低温側冷却水用流路を通過する低温側冷却水ＬＷと分岐流路３０を通過する高温側冷却水ＨＷが混合された混合冷却水ＭＷとして、この混合冷却水ＭＷがＥＧＲクーラ２４に流通するように構成する。図１では、混合冷却水ＭＷが流通する混合冷却水用流路を極太線で示している。なお、ＥＧＲクーラ２４を通過後の混合冷却水ＭＷは、高温側冷却水用流路と低温側冷却水用流路の各々を通過する冷却水量を維持するために、低水温用ラジエータ２１と、高水温用ラジエータ１１と高水温用ウォーターポンプ１２の間の高温側冷却水用流路の両方に還流する。また、高温側冷却水ＨＷの温度は約８０℃〜１００℃、混合冷却水ＭＷの温度は約５０℃〜７０℃、低温側冷却水ＬＷの温度は約３０℃〜４０℃である。 In the internal combustion engine of the present invention, an EGR cooler 24 for cooling the exhaust gas (EGR gas) recirculated from the exhaust passage to the intake passage is provided in the EGR passage (not shown), and the EGR cooler 24 is used as a flow for cooling water on the low temperature side. A branch flow path 30 branched from the high temperature side cooling water flow path is connected to the low temperature side cooling water flow path on the upstream side of the EGR cooler 24 while being configured so that the path passes through. Then, the cooling water that passes through the flow path between the connection point CP of the low temperature side cooling water flow path and the branch flow path 30 and the EGR cooler 24 is passed through the low temperature side cooling water flow path, and the low temperature side cooling water LW. As a mixed cooling water MW in which the high temperature side cooling water HW passing through the branch flow path 30 is mixed, the mixed cooling water MW is configured to flow to the EGR cooler 24. In FIG. 1, the flow path for the mixed cooling water through which the mixed cooling water MW flows is shown by an extra-thick line. The mixed cooling water MW after passing through the EGR cooler 24 includes the radiator 21 for low water temperature and the radiator 21 for low water temperature in order to maintain the amount of cooling water passing through each of the high temperature side cooling water flow path and the low temperature side cooling water flow path. It circulates to both the high-temperature side cooling water flow path between the high-water temperature radiator 11 and the high-water temperature water pump 12. The temperature of the high temperature side cooling water HW is about 80 ° C. to 100 ° C., the temperature of the mixed cooling water MW is about 50 ° C. to 70 ° C., and the temperature of the low temperature side cooling water LW is about 30 ° C. to 40 ° C.

本発明の内燃機関によれば、エンジン冷却水（高温側冷却水）ＨＷと吸気ガス冷却用の低温側冷却水ＬＷを混合して、エンジン冷却水ＨＷより低温の混合冷却水ＭＷを冷却媒体としてＥＧＲクーラ２４に流通させるので、エンジン冷却水ＨＷを冷却媒体とする従来技術と比較して、ＥＧＲガスを更に低温化することができる。その結果、気筒内に流入される吸気とＥＧＲガスの混合気を低体積化して車両の燃費性能を良化させることができるとともに、混合気を低温化して排ガス性能を良化させることができる。 According to the internal combustion engine of the present invention, the engine cooling water (high temperature side cooling water) HW and the low temperature side cooling water LW for cooling the intake gas are mixed, and the mixed cooling water MW lower than the engine cooling water HW is used as the cooling medium. Since it is circulated to the EGR cooler 24, the temperature of the EGR gas can be further lowered as compared with the conventional technique using the engine cooling water HW as the cooling medium. As a result, the volume of the air-fuel mixture flowing into the cylinder and the EGR gas can be reduced to improve the fuel efficiency of the vehicle, and the temperature of the air-fuel mixture can be lowered to improve the exhaust gas performance.

また、ＥＧＲクーラ２４の冷却媒体として低温側冷却水ＬＷを用いることなく、低温側冷却水ＬＷより高温の混合冷却水ＭＷを用いるので、ＥＧＲガスに含まれる水蒸気の凝縮化による凝縮水（腐食水）の生成を抑制することができる。その結果、凝縮水による各種配管及びバルブ等の腐食や劣化を抑制することができる。 Further, since the mixed cooling water MW having a temperature higher than that of the low temperature side cooling water LW is used as the cooling medium of the EGR cooler 24 without using the low temperature side cooling water LW, the condensed water (corrosive water) due to the condensation of the water vapor contained in the EGR gas. ) Can be suppressed. As a result, corrosion and deterioration of various pipes and valves due to condensed water can be suppressed.

また、図１に示すように、インタークーラ２３とＥＧＲクーラ２４の間の低温側冷却水用流路に接続点ＣＰを配置して、インタークーラ２３の下流側で混合冷却水ＭＷを生成するように構成すると、インタークーラ２３の上流側の低温側冷却水より下流側の低温側冷却水の方が水温が高いので、インタークーラ２３の上流側で混合冷却水ＭＷを生成する場合よりも、ＥＧＲクーラ２４に流入する混合冷却水ＭＷの温度範囲をより高温とすることができる。その結果、凝縮水の生成をより確実に抑制することができる。 Further, as shown in FIG. 1, a connection point CP is arranged in the low temperature side cooling water flow path between the intercooler 23 and the EGR cooler 24 so that the mixed cooling water MW is generated on the downstream side of the intercooler 23. Since the water temperature of the low-temperature side cooling water on the downstream side is higher than that of the low-temperature side cooling water on the upstream side of the intercooler 23, the EGR is higher than the case where the mixed cooling water MW is generated on the upstream side of the intercooler 23. The temperature range of the mixed cooling water MW flowing into the cooler 24 can be made higher. As a result, the generation of condensed water can be suppressed more reliably.

また、図１に示すように、接続点ＣＰより上流側の分岐流路３０及び低温側冷却水用流路のそれぞれに、第１逆止弁３１Ａ、第２逆止弁３１Ｂを備えて構成すると、高温側冷却水ＨＷが接続点ＣＰを経由してインタークーラ２３に流入したり、あるいは、混合冷却水ＭＷ及び低温側冷却水ＬＷが接続点ＣＰ及び分岐流路３０を経由して高温側冷却水用流路に流入したりするのを防止することができる。その結果、各冷却水用流路に適正な温度の冷却水が確実に流れるので、エンジン１０の過剰冷却やインタークーラ２３の冷却性能低下等の不具合を防止することができる。 Further, as shown in FIG. 1, a first check valve 31A and a second check valve 31B are provided in each of the branch flow path 30 on the upstream side of the connection point CP and the cooling water flow path on the low temperature side. , The high temperature side cooling water HW flows into the intercooler 23 via the connection point CP, or the mixed cooling water MW and the low temperature side cooling water LW are cooled on the high temperature side via the connection point CP and the branch flow path 30. It is possible to prevent it from flowing into the water flow path. As a result, the cooling water having an appropriate temperature flows reliably through each cooling water flow path, so that problems such as excessive cooling of the engine 10 and deterioration of the cooling performance of the intercooler 23 can be prevented.

また、各冷却水用流路を構成する配管またはホースを通過する冷却水に、この冷却水と温度差のある別の冷却水が瞬間的に大量に流入するのを防止することができるので、各冷却水用流路を構成する配管またはホースの急膨張または急収縮の発生を防止することができる。なお、接続点（混合部）ＣＰの極力近くに逆止弁３１Ａ、３１Ｂを配置すると、接続点（混合部）ＣＰより上流側かつ逆止弁３１Ａ、３１Ｂの下流での配管またはホースの急膨張または急収縮の発生を防止することができるので、好ましい。 Further, since it is possible to prevent a large amount of cooling water having a temperature difference from that of the cooling water from momentarily flowing into the cooling water passing through the pipes or hoses constituting each cooling water flow path. It is possible to prevent the occurrence of sudden expansion or contraction of the pipes or hoses constituting each cooling water flow path. If the check valves 31A and 31B are placed as close as possible to the connection point (mixing section) CP, the piping or hose rapidly expands on the upstream side of the connection point (mixing section) CP and downstream of the check valves 31A and 31B. Alternatively, it is preferable because it can prevent the occurrence of sudden contraction.

より詳細には、第１逆止弁３１Ａ及び第２逆止弁３１Ｂを備える場合では、図２に示すように、イグニッションキーのオフ時（エンジン１０の停止時）等で、各ウォーターポンプ１２、２２が停止して回転速度がゼロとなるが、慣性により各冷却水が瞬時に停止しないときでも、各冷却水用流路における冷却水の温度を維持することができる。例えば、分岐流路３０のＡ点を通過する冷却水量（Ａ点水量）やインタークーラ２３より下流側の低温側冷却水用流路のＢ点を通過する冷却水量（Ｂ点水量）が瞬時に低下しないときでも、Ａ点における高温側冷却水ＨＷの温度（Ａ点水温）を高温に、Ｂ点における低温側冷却水ＬＷの温度（Ｂ点水温）を低温に維持することができる。 More specifically, in the case where the first check valve 31A and the second check valve 31B are provided, as shown in FIG. 2, when the ignition key is turned off (when the engine 10 is stopped) or the like, each water pump 12 Although 22 stops and the rotation speed becomes zero, the temperature of the cooling water in each cooling water flow path can be maintained even when each cooling water does not stop instantaneously due to inertia. For example, the amount of cooling water passing through point A of the branch flow path 30 (point A water amount) and the amount of cooling water passing through point B of the low temperature side cooling water flow path downstream of the intercooler 23 (point B water amount) are instantaneous. Even when the temperature does not decrease, the temperature of the high temperature side cooling water HW at the point A (point A water temperature) can be maintained at a high temperature, and the temperature of the low temperature side cooling water LW at the point B (point B water temperature) can be maintained at a low temperature.

これに対して、第１逆止弁３１Ａ及び第２逆止弁３１Ｂを備えない場合では、図３に示すように、Ａ点を通過する高温側冷却水ＨＷがＢ点まで逆流して、Ｂ点を通過する低温側冷却水ＬＷの温度が高温側冷却水ＨＷの温度に近い値まで上昇したり、あるいは、図４に示すように、Ｂ点を通過する低温側冷却水ＬＷがＡ点まで逆流して、Ａ点を通過する高温側冷却水ＨＷの温度が低温側冷却水ＬＷの温度に近い値まで下降したりする虞がある。なお、図２〜図４では、高水温用ウォーターポンプ１２の回転速度の推移は図示せず、低水温用ウォーターポンプ２２の回転速度の推移のみを図示している。 On the other hand, when the first check valve 31A and the second check valve 31B are not provided, as shown in FIG. 3, the high temperature side cooling water HW passing through the point A flows back to the point B, and the B The temperature of the low-temperature side cooling water LW passing through the point rises to a value close to the temperature of the high-temperature side cooling water HW, or as shown in FIG. 4, the low-temperature side cooling water LW passing through the point B reaches the point A. There is a possibility that the temperature of the high-temperature side cooling water HW passing through the point A may drop to a value close to the temperature of the low-temperature side cooling water LW due to the backflow. Note that, in FIGS. 2 to 4, the transition of the rotation speed of the high water temperature water pump 12 is not shown, and only the transition of the rotation speed of the low water temperature water pump 22 is shown.

１０ エンジン（内燃機関）
１１ 高水温用ラジエータ
１２ 高水温用ウォーターポンプ（高水温用送水装置）
２１ 低水温用ラジエータ
２２ 低水温用ウォーターポンプ（低水温用送水装置）
２３ インタークーラ
２４ ＥＧＲクーラ
３０ 分岐流路
３１Ａ 第１逆止弁
３１Ｂ 第２逆止弁
ＣＰ 接続点
ＨＷ 高温側冷却水（エンジン冷却水）
ＭＷ 混合冷却水
ＬＷ 低温側冷却水 10 engine (internal combustion engine)
11 Radiator for high water temperature 12 Water pump for high water temperature (water supply device for high water temperature)
21 Radiator for low water temperature 22 Water pump for low water temperature (water supply device for low water temperature)
23 Intercooler 24 EGR cooler 30 Branch flow path 31A 1st check valve 31B 2nd check valve CP connection point HW High temperature side cooling water (engine cooling water)
MW mixed cooling water LW low temperature side cooling water

Claims (2)

内燃機関の冷却を行う高温側冷却水が流通する高温側冷却水用流路に高水温用ラジエータと高水温用送水装置を備えるとともに、前記内燃機関の吸気通路を通過する吸気ガスの冷却を行う低温側冷却水が流通する低温側冷却水用流路に低水温用ラジエータと低水温用送水装置を備えて構成される内燃機関において、
前記低温側冷却水用流路の前記低水温用ラジエータよりも下流側に配置されて前記吸気通路を通過する吸気ガスの冷却を前記低温側冷却水にて行うインタークーラと、このインタークーラよりも下流側に配置されて前記内燃機関の排気通路から前記吸気通路に還流されるＥＧＲガスの冷却を行うＥＧＲクーラとを備えるとともに、前記インタークーラと前記ＥＧＲクーラの間の前記低温側冷却水用流路に、前記高温側冷却水用流路より分岐した分岐流路を接続して、前記インタークーラを通過した低温側冷却水と前記分岐流路を通過した高温側冷却水が混合された混合冷却水を前記ＥＧＲクーラに流通させるように構成される内燃機関。 A radiator for high water temperature and a water supply device for high water temperature are provided in the flow path for cooling water on the high temperature side through which the cooling water on the high temperature side for cooling the internal combustion engine flows, and the intake gas passing through the intake passage of the internal combustion engine is cooled. In an internal combustion engine composed of a radiator for low water temperature and a water supply device for low water temperature in the flow path for cooling water on the low temperature side through which the cooling water on the low temperature side flows.
An intercooler arranged on the downstream side of the low water temperature radiator of the low temperature side cooling water flow path and cooling the intake gas passing through the intake passage with the low temperature side cooling water, and an intercooler. An EGR cooler that is arranged on the downstream side and cools the EGR gas that is returned from the exhaust passage of the internal combustion engine to the intake passage is provided, and the flow for the low temperature side cooling water between the intercooler and the EGR cooler. A branch flow path branched from the high temperature side cooling water flow path is connected to the path, and mixed cooling is a mixture of low temperature side cooling water that has passed through the intercooler and high temperature side cooling water that has passed through the branch flow path. An internal combustion engine configured to circulate water through the EGR cooler. 前記低温側冷却水用流路と前記分岐流路の接続点より上流側の前記分岐流路及び前記低温側冷却水用流路のそれぞれに、第１逆止弁、第２逆止弁を備えて構成される請求項１に記載の内燃機関。 A first check valve and a second check valve are provided in the branch flow path on the upstream side of the connection point between the low temperature side cooling water flow path and the branch flow path and the low temperature side cooling water flow path, respectively. The internal combustion engine according to claim 1 .
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