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JP2013024082A - Cooling circuit for engine - Google Patents

Cooling circuit for engine Download PDF

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Publication number
JP2013024082A
JP2013024082A JP2011157898A JP2011157898A JP2013024082A JP 2013024082 A JP2013024082 A JP 2013024082A JP 2011157898 A JP2011157898 A JP 2011157898A JP 2011157898 A JP2011157898 A JP 2011157898A JP 2013024082 A JP2013024082 A JP 2013024082A
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Japan
Prior art keywords
engine
cooling water
water
egr
outlet
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JP2011157898A
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Japanese (ja)
Inventor
Akira Iijima
章 飯島
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Isuzu Motors Ltd
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Isuzu Motors Ltd
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Priority to JP2011157898A priority Critical patent/JP2013024082A/en
Priority to PCT/JP2012/064745 priority patent/WO2013011767A1/en
Publication of JP2013024082A publication Critical patent/JP2013024082A/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F01P2003/028—Cooling cylinders and cylinder heads in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2037/00—Controlling
    • F01P2037/02—Controlling starting
    • 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
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers

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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

PROBLEM TO BE SOLVED: To provide a cooling circuit for an engine that does not boil a cooling water in an EGR cooler even when a water flow to the engine is stopped.SOLUTION: A cooling circuit 1 includes an EGR cooling water passage 11 connected to an engine cooling water supplying passage 8 on a downstream of a water pump 9, an EGR cooler 12 provided in the EGR cooling water passage 11 and for cooling exhaust gas recirculated from an exhaust system to an intake system of an engine 2, a blocking valve 14 provided in the engine cooling water supplying passage 8 on the downstream of a connecting part of the EGR cooling water passage 11, and a controller 16 for controlling the blocking valve 14. The controller 16 closes the blocking valve 14 during a warm-up of the engine 2 to flow the cooling water into the EGR cooler 12 while blocking the water from flowing into the engine 2, and the controller 16 opens the blocking valve 14 during a normal operation other than the warm-up so as to flow the cooling water into the engine 2 and the EGR cooler 12.

Description

本発明は、水冷式エンジンの冷却回路に関する。   The present invention relates to a cooling circuit for a water-cooled engine.

一般的なエンジン（内燃機関）では、図３に示すように冷却水が流れる。   In a general engine (internal combustion engine), cooling water flows as shown in FIG.

図３に示す冷却回路３０では、エンジン３１（シリンダヘッド３３）の冷却水出口とサーモスタット３４の冷却水入口とが第一エンジン冷却水戻し管３５によって連通され、サーモスタット３４の冷却水出口とラジエータ３６の冷却水入口とが第二エンジン冷却水戻し管３７によって連通されている。ラジエータ３６の冷却水出口とウォーターポンプ３８の吸込口とが第一エンジン冷却水供給管３９で連通され、ウォーターポンプ３８の吐出口とエンジン３１（シリンダブロック３２）の冷却水入口とが第二エンジン冷却水供給管４０によって連通されている。第一エンジン冷却水戻し管３５とＥＧＲクーラ４１の冷却水入口とが第一ＥＧＲ冷却水管４２によって連通されており、ＥＧＲクーラ４１の冷却水出口と第一エンジン冷却水供給管３９とが第二ＥＧＲ冷却水管４３によって連通されている。   In the cooling circuit 30 shown in FIG. 3, the cooling water outlet of the engine 31 (cylinder head 33) and the cooling water inlet of the thermostat 34 are communicated by a first engine cooling water return pipe 35, and the cooling water outlet of the thermostat 34 and the radiator 36 are communicated. The second engine coolant return pipe 37 communicates with the coolant inlet. A cooling water outlet of the radiator 36 and a suction port of the water pump 38 are communicated with each other by a first engine cooling water supply pipe 39, and a discharge port of the water pump 38 and a cooling water inlet of the engine 31 (cylinder block 32) are connected to the second engine. The cooling water supply pipe 40 communicates. The first engine cooling water return pipe 35 and the cooling water inlet of the EGR cooler 41 are communicated with each other by a first EGR cooling water pipe 42, and the cooling water outlet of the EGR cooler 41 and the first engine cooling water supply pipe 39 are connected to the second. The EGR cooling water pipe 43 communicates.

また、サーモスタット３４とウォーターポンプ３８とはバイパス管４４によって連通されており、第一エンジン冷却水戻し管３５内の冷却水温度が所定温度より低い場合には、サーモスタット３４は自ずと閉となり、冷却水をラジエータ３６には流さずにバイパス管４４を介してウォーターポンプ３８へと流すようになっている。   The thermostat 34 and the water pump 38 are communicated with each other by a bypass pipe 44. When the cooling water temperature in the first engine cooling water return pipe 35 is lower than a predetermined temperature, the thermostat 34 is automatically closed and the cooling water is cooled. Is not supplied to the radiator 36 but is supplied to the water pump 38 via the bypass pipe 44.

この種のエンジンの冷却回路は、例えば特許文献１に開示されている。   A cooling circuit for this type of engine is disclosed in, for example, Patent Document 1.

特開２０１０−１５１０９６号公報JP 2010-151096 A

エンジンの暖機中はウォーターポンプの吐出口をバルブによって遮断して、エンジン（シリンダブロック、シリンダヘッド）への通水を止めると、冷却水温度の上昇が早くなり、エンジンの暖機を早期に完了させ得る。しかし、特に図３に示す冷却回路の場合、ウォーターポンプの吐出口をバルブによって遮断すると、ＥＧＲクーラへの通水も止まるため、ＥＧＲクーラ内で冷却水の沸騰が起こる虞がある。   When the engine is warming up, shut off the water pump discharge port with a valve to stop the water flow to the engine (cylinder block, cylinder head). Can be completed. However, in the case of the cooling circuit shown in FIG. 3 in particular, if the discharge port of the water pump is shut off by the valve, the water flow to the EGR cooler is stopped, so that the cooling water may be boiled in the EGR cooler.

そこで、本発明の目的は、エンジンへの通水を止めても、ＥＧＲクーラ内で冷却水の沸騰を起こすことが無いエンジンの冷却回路を提供することにある。   Accordingly, an object of the present invention is to provide an engine cooling circuit that does not cause boiling of cooling water in the EGR cooler even when water flow to the engine is stopped.

上述の目的を達成するために、本発明は、エンジンの冷却水出口とラジエータの冷却水入口とがエンジン冷却水戻し水路により接続されると共に、前記ラジエータの冷却水出口と前記エンジンの冷却水入口とがエンジン冷却水供給水路により接続され、前記エンジン冷却水供給水路にウォーターポンプが配設される冷却回路であって、前記ウォーターポンプよりも下流側の前記エンジン冷却水供給水路に接続されたＥＧＲ冷却水路と、前記ＥＧＲ冷却水路に配設され、前記エンジンの排気系から吸気系に再循環させる排気ガスを冷却するＥＧＲクーラと、前記ＥＧＲ冷却水路の接続部よりも下流側の前記エンジン冷却水供給水路に設けられた遮断バルブと、前記遮断バルブを制御する制御手段とを備え、前記制御手段は、前記エンジンの暖機中は、前記エンジンへの通水を遮断する一方で冷却水を前記ＥＧＲクーラに流すべく、前記遮断バルブを閉とし、前記暖機中を除く通常運転時は、冷却水を前記エンジン及び前記ＥＧＲクーラに流すべく、前記遮断バルブを開とするものである。   In order to achieve the above-mentioned object, the present invention provides an engine cooling water outlet and a radiator cooling water inlet connected by an engine cooling water return water channel, and the radiator cooling water outlet and the engine cooling water inlet. Is a cooling circuit in which a water pump is disposed in the engine cooling water supply water channel, and an EGR connected to the engine cooling water supply water channel on the downstream side of the water pump. A cooling water passage, an EGR cooler disposed in the EGR cooling water passage for cooling exhaust gas recirculated from the exhaust system of the engine to the intake system, and the engine cooling water downstream of a connection portion of the EGR cooling water passage A shutoff valve provided in the supply water channel, and a control means for controlling the shutoff valve, wherein the control means warms up the engine. Shuts off the water flow to the engine while allowing the cooling water to flow to the EGR cooler, and closes the shut-off valve, and during normal operation except during the warm-up, the cooling water is supplied to the engine and the EGR cooler. The shut-off valve is opened in order to flow through.

前記エンジン冷却水戻し水路に設けられ、エンジン出口水温を検出するエンジン出口水温検出手段をさらに備え、前記制御手段は、前記エンジン出口水温検出手段により検出したエンジン出口水温が所定温度未満のとき、前記暖機中と判断し、前記エンジン出口水温検出手段により検出したエンジン出口水温が前記所定温度以上のとき、前記通常運転時と判断するものであっても良い。   Provided in the engine cooling water return water channel, further comprising an engine outlet water temperature detecting means for detecting an engine outlet water temperature, and the control means, when the engine outlet water temperature detected by the engine outlet water temperature detecting means is less than a predetermined temperature, When the engine outlet water temperature detected by the engine outlet water temperature detecting means is equal to or higher than the predetermined temperature, it is determined that the engine is in normal operation.

本発明によれば、エンジンへの通水を止めても、ＥＧＲクーラ内で冷却水の沸騰を起こすことが無いという優れた効果を奏する。   According to the present invention, there is an excellent effect that cooling water does not boil in the EGR cooler even if water flow to the engine is stopped.

本発明の一実施形態に係るエンジンの冷却回路のブロック図である。It is a block diagram of the cooling circuit of the engine concerning one embodiment of the present invention. ＥＣＵによる遮断バルブの制御フローを示す図である。It is a figure which shows the control flow of the cutoff valve by ECU. 冷却水の流れの一例を示すエンジンの冷却回路のブロック図である。It is a block diagram of the cooling circuit of the engine which shows an example of the flow of cooling water.

以下、本発明の好適な実施形態を添付図面に基づいて詳述する。   DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

図１に示す本実施形態に係る冷却回路１においては、エンジン２は、シリンダブロック３とシリンダヘッド４とを有している。   In the cooling circuit 1 according to this embodiment shown in FIG. 1, the engine 2 includes a cylinder block 3 and a cylinder head 4.

エンジン２（シリンダヘッド４）の冷却水出口とラジエータ５の冷却水入口とはエンジン冷却水戻し水路６により接続されており、エンジン冷却水戻し水路６には、サーモスタット７が配設されている。エンジン冷却水戻し水路６は、エンジン２の冷却水出口とサーモスタット７の冷却水入口とを連通する第一エンジン冷却水戻し管６ａと、サーモスタット７の冷却水出口とラジエータ５の冷却水入口とを連通する第二エンジン冷却水戻し管６ｂとから構成されている。   The cooling water outlet of the engine 2 (cylinder head 4) and the cooling water inlet of the radiator 5 are connected by an engine cooling water return channel 6, and a thermostat 7 is disposed in the engine cooling water return channel 6. The engine cooling water return water channel 6 includes a first engine cooling water return pipe 6 a that communicates the cooling water outlet of the engine 2 and the cooling water inlet of the thermostat 7, and the cooling water outlet of the thermostat 7 and the cooling water inlet of the radiator 5. The second engine cooling water return pipe 6b communicates with the second engine cooling water return pipe 6b.

ラジエータ５の冷却水出口とエンジン２（シリンダブロック３）の冷却水入口とはエンジン冷却水供給水路８により接続されており、エンジン冷却水供給水路８には、ウォーターポンプ９が配設されている。エンジン冷却水供給水路８は、ラジエータ５の冷却水出口とウォーターポンプ９の吸込口とを連通する第一エンジン冷却水供給管８ａと、ウォーターポンプ９の吐出口とエンジン２の冷却水入口とを連通する第二エンジン冷却水供給管８ｂとから構成されている。   A cooling water outlet of the radiator 5 and a cooling water inlet of the engine 2 (cylinder block 3) are connected by an engine cooling water supply water channel 8, and a water pump 9 is disposed in the engine cooling water supply water channel 8. . The engine cooling water supply channel 8 includes a first engine cooling water supply pipe 8 a that communicates the cooling water outlet of the radiator 5 and the suction port of the water pump 9, the discharge port of the water pump 9, and the cooling water inlet of the engine 2. The second engine cooling water supply pipe 8b communicates.

ウォーターポンプ９は、エンジン２のクランクシャフト等に連結され、クランクシャフト等の回転で駆動される機械式のものである。   The water pump 9 is a mechanical type that is connected to a crankshaft or the like of the engine 2 and is driven by rotation of the crankshaft or the like.

サーモスタット７とウォーターポンプ９とはバイパス管（バイパス水路）１０によって接続されており、第一エンジン冷却水戻し管６ａ内の冷却水温度が所定温度（例えば、８６℃）よりも低い場合には、サーモスタット７は自ずと閉となり、冷却水をラジエータ５には流さずにバイパス管１０を介してウォーターポンプ９へと流すようになっている。   When the thermostat 7 and the water pump 9 are connected by a bypass pipe (bypass water passage) 10, and the cooling water temperature in the first engine cooling water return pipe 6a is lower than a predetermined temperature (for example, 86 ° C.), The thermostat 7 is automatically closed so that the cooling water does not flow to the radiator 5 but flows to the water pump 9 via the bypass pipe 10.

第二エンジン冷却水供給管８ｂ（つまり、ウォーターポンプ９よりも下流側のエンジン冷却水供給水路８）にＥＧＲ冷却水路１１が接続されており、ＥＧＲ冷却水路１１には、エンジン２の排気系から吸気系に再循環させる排気ガスを冷却するＥＧＲクーラ１２が配設されている。ＥＧＲ冷却水路１１の戻し部は、第二エンジン冷却水戻し管６ｂ（つまり、サーモスタット７よりも下流側のエンジン冷却水戻し水路６）に接続されている。ＥＧＲ冷却水路１１は、第二エンジン冷却水供給管８ｂとＥＧＲクーラ１２の冷却水入口とを繋ぐ第一ＥＧＲ冷却水管１１ａと、ＥＧＲクーラ１２の冷却水出口と第二エンジン冷却水戻し管６ｂとを繋ぐ第二ＥＧＲ冷却水管１１ｂとから構成されている。   An EGR cooling water passage 11 is connected to the second engine cooling water supply pipe 8b (that is, the engine cooling water supply water passage 8 on the downstream side of the water pump 9). An EGR cooler 12 that cools the exhaust gas recirculated to the intake system is provided. The return portion of the EGR cooling water channel 11 is connected to the second engine cooling water return pipe 6b (that is, the engine cooling water return water channel 6 on the downstream side of the thermostat 7). The EGR cooling water channel 11 includes a first EGR cooling water pipe 11a that connects the second engine cooling water supply pipe 8b and the cooling water inlet of the EGR cooler 12, a cooling water outlet of the EGR cooler 12, and a second engine cooling water return pipe 6b. It is comprised from the 2nd EGR cooling water pipe | tube 11b which connects.

第一ＥＧＲ冷却水管１１ａ（つまり、ＥＧＲクーラ１２よりも上流側のＥＧＲ冷却水路１１）には、ＥＧＲクーラ１２への水流量を制限する絞り部（絞り）１３が設けられている。   The first EGR cooling water pipe 11a (that is, the EGR cooling water channel 11 on the upstream side of the EGR cooler 12) is provided with a throttle (throttle) 13 that restricts the flow rate of water to the EGR cooler 12.

本実施形態では、第一ＥＧＲ冷却水管１１ａ（ＥＧＲ冷却水路１１）の接続部よりも下流側の第二エンジン冷却水供給管８ｂ（エンジン冷却水供給水路８）に、エンジン側遮断バルブ（以下、遮断バルブという）１４が配設されており、第一エンジン冷却水戻し管６ａ（つまり、サーモスタット７よりも上流側のエンジン冷却水戻し水路６）には、エンジン出口水温を検出するエンジン出口水温センサ（エンジン出口水温検出手段）１５が配設されている。遮断バルブ１４は、制御手段としてのＥＣＵ（電子制御ユニット）１６により開閉制御されるものである。   In the present embodiment, an engine-side shut-off valve (hereinafter referred to as “engine-side cutoff valve”) is connected to the second engine cooling water supply pipe 8b (engine cooling water supply water path 8) on the downstream side of the connection portion of the first EGR cooling water pipe 11a (EGR cooling water path 11). An engine outlet water temperature sensor for detecting the engine outlet water temperature is provided in the first engine cooling water return pipe 6a (that is, the engine cooling water return water channel 6 upstream of the thermostat 7). (Engine outlet water temperature detection means) 15 is provided. The shutoff valve 14 is controlled to be opened and closed by an ECU (Electronic Control Unit) 16 as control means.

ＥＵＣ１６は、エンジン２の暖機中は、エンジン２への通水を遮断する一方で冷却水をＥＧＲクーラ１２のみに流すべく、遮断バルブ１４を閉とし、一方、エンジン２の暖機中を除く通常運転時（暖機完了）は、冷却水をエンジン２及びＥＧＲクーラ１２に流すべく、遮断バルブ１４を開とするようになっている。   While the engine 2 is warming up, the EUC 16 shuts off the water flow to the engine 2 while closing the shut-off valve 14 so that the cooling water flows only to the EGR cooler 12, while excluding the engine 2 during warming up. During normal operation (warm-up completion), the shutoff valve 14 is opened so that the coolant flows through the engine 2 and the EGR cooler 12.

本実施形態では、ＥＣＵ１６は、エンジン出口水温センサ１５により検出されるエンジン出口水温が所定温度（例えば、８０℃）未満のときにエンジン２が暖機中と判断し、一方、エンジン出口水温センサ１５により検出されるエンジン出口水温が前述の所定温度以上のときにエンジン２の通常運転時と判断するようになっている。   In the present embodiment, the ECU 16 determines that the engine 2 is warming up when the engine outlet water temperature detected by the engine outlet water temperature sensor 15 is lower than a predetermined temperature (for example, 80 ° C.), while the engine outlet water temperature sensor 15 When the engine outlet water temperature detected by the above is equal to or higher than the predetermined temperature, it is determined that the engine 2 is in normal operation.

ＥＣＵ１６による遮断バルブ１４の制御フローを図２により説明する。   A control flow of the shutoff valve 14 by the ECU 16 will be described with reference to FIG.

先ず、ＥＣＵ１６は、ステップＳ１において、エンジン２が暖機中であるか否かを判定する。次いで、ステップＳ１においてエンジン２が暖機中である（ＹＥＳ）と判断した場合、ＥＣＵ１６は、ステップＳ２において遮断バルブ１４を閉とし、本制御をリターンする。一方、ステップＳ１においてエンジン２が暖機中でない（ＮＯ；通常運転時）と判断した場合、ＥＣＵ１６は、ステップＳ３において遮断バルブ１４を開とし、本制御をリターンする。   First, in step S1, the ECU 16 determines whether or not the engine 2 is warming up. Next, when it is determined in step S1 that the engine 2 is warming up (YES), the ECU 16 closes the cutoff valve 14 in step S2 and returns this control. On the other hand, if it is determined in step S1 that the engine 2 is not warming up (NO; during normal operation), the ECU 16 opens the shutoff valve 14 in step S3, and returns to this control.

次に、本実施形態の作用を説明する。   Next, the operation of this embodiment will be described.

エンジン２の暖機中には、ＥＣＵ１６によって遮断バルブ１４が閉とされ、エンジン２（シリンダブロック３、シリンダヘッド４）には冷却水が流れず、ＥＧＲクーラ１２のみに冷却水が流れるようになる。この際、絞り部１３によりＥＧＲクーラ１２への水流量は制限される。ＥＧＲクーラ１２へはウォーターポンプ９の全水流量を流す必要はないので、ＥＧＲクーラ１２への水流量を制限する。   During the warm-up of the engine 2, the shutoff valve 14 is closed by the ECU 16, so that cooling water does not flow into the engine 2 (cylinder block 3, cylinder head 4), and cooling water flows only into the EGR cooler 12. . At this time, the water flow rate to the EGR cooler 12 is limited by the throttle unit 13. Since it is not necessary to flow the total water flow rate of the water pump 9 to the EGR cooler 12, the water flow rate to the EGR cooler 12 is limited.

一方、エンジン２の通常運転時には、ＥＣＵ１６によって遮断バルブ１４が開とされ、エンジン２（シリンダブロック３、シリンダヘッド４）、及びＥＧＲクーラ１２に冷却水が流れるようになる。この際、絞り部１３によりＥＧＲクーラ１２への水流量は制限される。ＥＧＲクーラ１２で要求される水流量がエンジン２で要求される水流量と比較して少ないので、ＥＧＲクーラ１２への水流量を制限する。   On the other hand, during normal operation of the engine 2, the shutoff valve 14 is opened by the ECU 16, and cooling water flows through the engine 2 (cylinder block 3 and cylinder head 4) and the EGR cooler 12. At this time, the water flow rate to the EGR cooler 12 is limited by the throttle unit 13. Since the water flow rate required by the EGR cooler 12 is smaller than the water flow rate required by the engine 2, the water flow rate to the EGR cooler 12 is limited.

本実施形態によれば、エンジン２の暖機促進のため、エンジン２の暖機中は遮断バルブ１４を遮断してエンジン２（シリンダブロック３、シリンダヘッド４）への通水を止めても、ＥＧＲクーラ１２への通水は継続されるので、ＥＧＲクーラ１２内の冷却水の沸騰を起こすことが無い。   According to this embodiment, in order to promote warm-up of the engine 2, even if the shutoff valve 14 is shut off and water flow to the engine 2 (cylinder block 3, cylinder head 4) is stopped during warm-up of the engine 2, Since the water flow to the EGR cooler 12 is continued, the cooling water in the EGR cooler 12 does not boil.

また、エンジン２への通水を止めてもＥＧＲクーラ１２内の冷却水の沸騰を起こすことが無く、遮断バルブ１４の遮断時間を長くすることができるので、よりエンジン２の暖機を促進し、結果として燃費を良くすることができる。   Further, even if the water flow to the engine 2 is stopped, the cooling water in the EGR cooler 12 does not boil and the shut-off time of the shut-off valve 14 can be lengthened. As a result, fuel consumption can be improved.

以上、本発明の好適な実施形態について説明したが、本発明は上述の実施形態には限定されず他の様々な実施形態を採ることが可能である。   The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various other embodiments can be adopted.

例えば、第二ＥＧＲ冷却水管１１ｂ（つまり、ＥＧＲクーラ１２よりも下流側のＥＧＲ冷却水路１１）に絞り部１３を配設しても良い。このようにしても、ＥＧＲクーラ１２への水流量を制限することが可能である。   For example, the throttle portion 13 may be disposed in the second EGR cooling water pipe 11b (that is, the EGR cooling water channel 11 on the downstream side of the EGR cooler 12). Even in this way, it is possible to limit the water flow rate to the EGR cooler 12.

さらに、本発明は、ディーゼルエンジン、ガソリンエンジン等の各種エンジンの冷却回路に適用することができる。   Furthermore, the present invention can be applied to cooling circuits for various engines such as diesel engines and gasoline engines.

１ 冷却回路
２ エンジン
５ ラジエータ
６ エンジン冷却水戻し水路
８ エンジン冷却水供給水路
９ ウォーターポンプ
１１ ＥＧＲ冷却水路
１２ ＥＧＲクーラ
１４ エンジン側遮断バルブ（遮断バルブ）
１５ エンジン出口水温センサ（エンジン出口水温検出手段）
１６ ＥＣＵ（制御手段） DESCRIPTION OF SYMBOLS 1 Cooling circuit 2 Engine 5 Radiator 6 Engine cooling water return channel 8 Engine cooling water supply channel 9 Water pump 11 EGR cooling channel 12 EGR cooler 14 Engine side shutoff valve (shutoff valve)
15 Engine outlet water temperature sensor (Engine outlet water temperature detection means)
16 ECU (control means)

Claims (2)

エンジンの冷却水出口とラジエータの冷却水入口とがエンジン冷却水戻し水路により接続されると共に、前記ラジエータの冷却水出口と前記エンジンの冷却水入口とがエンジン冷却水供給水路により接続され、前記エンジン冷却水供給水路にウォーターポンプが配設される冷却回路であって、
前記ウォーターポンプよりも下流側の前記エンジン冷却水供給水路に接続されたＥＧＲ冷却水路と、前記ＥＧＲ冷却水路に配設され、前記エンジンの排気系から吸気系に再循環させる排気ガスを冷却するＥＧＲクーラと、前記ＥＧＲ冷却水路の接続部よりも下流側の前記エンジン冷却水供給水路に設けられた遮断バルブと、前記遮断バルブを制御する制御手段とを備え、
前記制御手段は、
前記エンジンの暖機中は、前記エンジンへの通水を遮断する一方で冷却水を前記ＥＧＲクーラに流すべく、前記遮断バルブを閉とし、
前記暖機中を除く通常運転時は、冷却水を前記エンジン及び前記ＥＧＲクーラに流すべく、前記遮断バルブを開とする
ことを特徴とするエンジンの冷却回路。 The engine cooling water outlet and the radiator cooling water inlet are connected by an engine cooling water return water channel, and the radiator cooling water outlet and the engine cooling water inlet are connected by an engine cooling water supply channel, and the engine A cooling circuit in which a water pump is disposed in a cooling water supply channel,
An EGR cooling water channel connected to the engine cooling water supply channel downstream of the water pump, and an EGR that is disposed in the EGR cooling water channel and cools exhaust gas recirculated from the engine exhaust system to the intake system A cooler, a shut-off valve provided in the engine coolant supply water channel downstream of the connection portion of the EGR coolant channel, and a control means for controlling the shut-off valve,
The control means includes
During the warm-up of the engine, the shut-off valve is closed to shut off water flow to the engine while allowing cooling water to flow to the EGR cooler,
During normal operation except during warm-up, the shut-off valve is opened to allow cooling water to flow to the engine and the EGR cooler. 前記エンジン冷却水戻し水路に設けられ、エンジン出口水温を検出するエンジン出口水温検出手段をさらに備え、
前記制御手段は、
前記エンジン出口水温検出手段により検出したエンジン出口水温が所定温度未満のとき、前記暖機中と判断し、
前記エンジン出口水温検出手段により検出したエンジン出口水温が前記所定温度以上のとき、前記通常運転時と判断する
請求項１に記載のエンジンの冷却回路。 Provided in the engine cooling water return water channel, further comprising an engine outlet water temperature detecting means for detecting the engine outlet water temperature;
The control means includes
When the engine outlet water temperature detected by the engine outlet water temperature detection means is less than a predetermined temperature, it is determined that the engine is warming up,
The engine cooling circuit according to claim 1, wherein when the engine outlet water temperature detected by the engine outlet water temperature detecting means is equal to or higher than the predetermined temperature, it is determined that the normal operation is being performed.
JP2011157898A 2011-07-19 2011-07-19 Cooling circuit for engine Withdrawn JP2013024082A (en)

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