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JP2013127214A - Egr apparatus - Google Patents

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JP2013127214A
JP2013127214A JP2011276667A JP2011276667A JP2013127214A JP 2013127214 A JP2013127214 A JP 2013127214A JP 2011276667 A JP2011276667 A JP 2011276667A JP 2011276667 A JP2011276667 A JP 2011276667A JP 2013127214 A JP2013127214 A JP 2013127214A
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cooling water
egr
temperature
flow path
flow rate
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JP5857716B2 (en
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Kazushi Nakatani
一志 中谷
Yasuhisa Kameda
康寿 亀田
Tetsuma Takeda
哲馬 竹田
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Denso Corp
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract

【課題】ＥＧＲ装置１の弁ユニット３において、凝縮水の発生防止に対する信頼性を高める。
【解決手段】ＥＧＲ装置１は、ボディ７に設けられた冷却水路１３を通る冷却水の流量を増減する冷却水量調節手段１８を備え、ＥＣＵ４は、冷却水量調節手段１８に指令を与えて冷却水の流量を制御する冷却水量制御手段として機能する。これにより、例えば、内燃機関の暖機前のように冷却水の温度が低い場合には、冷却水がボディ７の加熱の妨げにならないように冷却水の通水を停止し、他の熱源（例えば、電動機８で発生する銅損等の発熱や、ＥＧＲガス自身が有する熱）を活用してボディ７を加熱することができる。このため、ＥＧＲ装置１の弁ユニット３において、凝縮水の発生を防止してデポジットの量を低減することで、ＥＧＲ弁２の固着防止に対する信頼性を高めることができる。
【選択図】図１In a valve unit (3) of an EGR device (1), reliability for preventing generation of condensed water is improved.
An EGR device includes a cooling water amount adjusting means for increasing or decreasing a flow rate of cooling water passing through a cooling water passage provided in a body, and an ECU gives a command to the cooling water amount adjusting means to give the cooling water It functions as a cooling water amount control means for controlling the flow rate of the water. Thereby, for example, when the temperature of the cooling water is low as before the warm-up of the internal combustion engine, the cooling water flow is stopped so that the cooling water does not hinder the heating of the body 7, and other heat sources ( For example, the body 7 can be heated by utilizing heat such as copper loss generated in the electric motor 8 or heat of the EGR gas itself. For this reason, in the valve unit 3 of the EGR device 1, the reliability for preventing the EGR valve 2 from sticking can be improved by preventing the generation of condensed water and reducing the amount of deposit.
[Selection] Figure 1

Description

本発明は、内燃機関に排気ガスを再循環するＥＧＲ装置に関するものである。   The present invention relates to an EGR device that recirculates exhaust gas to an internal combustion engine.

従来から、ＥＧＲ装置では、特許文献１に記載のような弁ユニットを備えるものが公知となっている。
ここで、弁ユニットは、内燃機関に再循環される排気ガスを通すＥＧＲ流路の一部を形成するボディと、このボディに回転自在に支持されてＥＧＲ流路を通る排気ガスの流量を増減するＥＧＲ弁と、このＥＧＲ弁を回転駆動する電動機とを備え、エンジンルーム内に配置されるものである（以下、ＥＧＲ流路を通って内燃機関に再循環される排気ガスをＥＧＲガスと呼び、ＥＧＲガスの流量をＥＧＲ量と呼ぶ。）。 Conventionally, an EGR device having a valve unit as described in Patent Document 1 has been known.
Here, the valve unit increases or decreases the flow rate of the exhaust gas passing through the EGR flow path that is rotatably supported by the body and forming a part of the EGR flow path through which the exhaust gas recirculated to the internal combustion engine is passed. And an electric motor that rotationally drives the EGR valve, and is disposed in the engine room (hereinafter, exhaust gas recirculated to the internal combustion engine through the EGR flow path is referred to as EGR gas). The flow rate of EGR gas is called the EGR amount.)

ところで、ＥＧＲガスはクーラによって冷却された後、弁ユニットに供給される。このため、弁ユニットにおいて、ＥＧＲガスに含まれる水分が凝縮して凝縮水が発生し、ＥＧＲガスに同伴されるＨＣ等が凝縮水とともに弁ユニット内に溜まってデポジットが発生する虞がある。この結果、例えば、ＥＧＲ弁の周縁とＥＧＲ流路の壁面との間のように互いに摺接し合う領域にデポジットが溜まると、ＥＧＲ弁の動作に支障が発生し、ＥＧＲ量の制御に障害が発生する虞がある。   By the way, the EGR gas is cooled by a cooler and then supplied to the valve unit. For this reason, in the valve unit, water contained in the EGR gas is condensed to generate condensed water, and HC and the like accompanying the EGR gas are accumulated in the valve unit together with the condensed water, and deposits may be generated. As a result, for example, if deposits accumulate in a region that is in sliding contact with each other, such as between the periphery of the EGR valve and the wall surface of the EGR flow path, the operation of the EGR valve will be hindered, and the EGR amount control will be hindered. There is a risk of doing.

そこで、特許文献１には、弁ユニットのボディにおいてＥＧＲ流路の周囲に内燃機関の冷却水が通る冷却水路を設け、冷却水路に冷却水を通水してボディを加熱する技術が開示されている。すなわち、冷却水によりボディを加熱して略一定の温度に保つことで弁ユニットの温度変動を抑え、デポジットの昇温および降温の繰り返しに伴うデポジットの固着力増加を抑制している。   Therefore, Patent Document 1 discloses a technique in which a cooling water passage through which the cooling water of the internal combustion engine passes is provided around the EGR flow passage in the body of the valve unit, and the body is heated by passing the cooling water through the cooling water passage. Yes. That is, the temperature of the valve unit is suppressed by heating the body with cooling water to maintain a substantially constant temperature, and an increase in deposit fixing force due to repeated heating and cooling of the deposit is suppressed.

ところで、近年の内燃機関の制御には、低燃費、低公害かつ高出力を高いレベルで実現するため、ストイキ状態とリーンバーン状態とを巧みに使い分けて制御する方式が存在する。しかし、このような内燃機関の制御では、それぞれの状態にとって最適なＥＧＲ量にする必要があり、最適なＥＧＲ量が少ない場合、クーラによるＥＧＲガスの冷却が過剰となって凝縮水が発生しやすくなり、凝縮水の発生によりデポジットの量が増加する虞がある。   By the way, in order to realize low fuel consumption, low pollution, and high output at a high level in recent years, there is a method of skillfully using the stoichiometric state and the lean burn state to control the internal combustion engine. However, in the control of such an internal combustion engine, it is necessary to set an optimum EGR amount for each state. When the optimum EGR amount is small, the EGR gas is cooled excessively by the cooler and condensed water is likely to be generated. Therefore, the amount of deposit may increase due to the generation of condensed water.

また、エンジンルームにおける余裕を高めるため、弁ユニットの体積低減が推進されている。しかし、弁ユニットの体積を低減すると、供給すべきＥＧＲガスの温度をより一層下げる必要があるため、弁ユニットの体積低減が推進されると、ＥＧＲガスの更なる温度低下に伴って凝縮水が発生しやすくなり、凝縮水の発生によりデポジットの量が増加する虞がある。
以上のような背景に鑑み、ＥＧＲ装置の弁ユニットにおいて、凝縮水の発生を防止してデポジットの量を低減することで、ＥＧＲ弁の固着防止に対する信頼性を高める必要がある。 Further, in order to increase the margin in the engine room, volume reduction of the valve unit is promoted. However, if the volume of the valve unit is reduced, it is necessary to further reduce the temperature of the EGR gas to be supplied. Therefore, when the volume reduction of the valve unit is promoted, the condensed water is reduced as the temperature of the EGR gas further decreases. It tends to occur and the amount of deposit may increase due to the generation of condensed water.
In view of the above background, in the valve unit of the EGR device, it is necessary to increase the reliability for preventing the EGR valve from sticking by preventing the generation of condensed water and reducing the amount of deposit.

特開２００４−１６２６６５号公報JP 2004-162665 A

本発明は、上記の問題点を解決するためになされたものであり、その目的は、ＥＧＲ装置の弁ユニットにおいて、凝縮水の発生を防止してデポジットの量を低減することで、ＥＧＲ弁の固着防止に対する信頼性を高めることにある。   The present invention has been made in order to solve the above-described problems, and an object of the present invention is to prevent the generation of condensed water and reduce the amount of deposit in the valve unit of the EGR device. The purpose is to increase the reliability for preventing sticking.

〔請求項１の手段〕
請求項１の手段によれば、ＥＧＲ装置は、内燃機関に排気ガスを再循環するためのＥＧＲ流路の一部を形成するとともに、ＥＧＲ流路の周囲に内燃機関の冷却水が通る冷却水路を有するボディと、ボディに回転自在に支持され、ＥＧＲ流路を通る排気ガスの流量を増減するＥＧＲ弁と、ＥＧＲ弁を回転駆動する電動機と、冷却水路を通る冷却水の流量を増減する冷却水量調節手段と、冷却水量調節手段に指令を与えて冷却水の流量を制御する冷却水量制御手段とを備える。 [Means of Claim 1]
According to the means of claim 1, the EGR device forms a part of the EGR flow path for recirculating the exhaust gas to the internal combustion engine, and the cooling water path through which the cooling water of the internal combustion engine passes around the EGR flow path , A body that is rotatably supported by the body, an EGR valve that increases or decreases the flow rate of the exhaust gas that passes through the EGR flow path, an electric motor that rotationally drives the EGR valve, and a cooling that increases or decreases the flow rate of the cooling water that passes through the cooling water path Water amount adjusting means and cooling water amount control means for giving a command to the cooling water amount adjusting means to control the flow rate of the cooling water.

これにより、例えば、内燃機関の暖機前のように冷却水の温度が低い場合には、冷却水がボディの加熱の妨げにならないように冷却水の通水を停止し、他の熱源（例えば、電動機で発生する銅損等の発熱や、ＥＧＲガス自身が有する熱）を活用してボディを加熱することができる。このため、ＥＧＲ装置の弁ユニットにおいて、凝縮水の発生を防止してデポジットの量を低減することで、ＥＧＲ弁の固着防止に対する信頼性を高めることができる。   Thereby, for example, when the temperature of the cooling water is low, such as before the warm-up of the internal combustion engine, the cooling water flow is stopped so that the cooling water does not hinder the heating of the body, and other heat sources (for example, The body can be heated by utilizing the heat generated by the electric motor such as copper loss and the heat of the EGR gas itself. For this reason, in the valve unit of the EGR device, it is possible to improve the reliability for preventing the EGR valve from sticking by preventing the generation of condensed water and reducing the amount of deposit.

〔請求項２の手段〕
請求項２の手段によれば、冷却水量制御手段は、ボディにおけるＥＧＲ流路の流路壁の温度に関する情報、および、冷却水路を通る冷却水の温度に関する情報を把握し、流路壁の温度が冷却水の温度よりも低いときには、流路壁の温度が上昇するように、かつ、流路壁の温度が冷却水の温度よりも高いときには、冷却水の温度が冷却水の沸点よりも低くなるように、冷却水の流量を制御する。 [Means of claim 2]
According to the means of claim 2, the cooling water amount control means grasps information on the temperature of the flow path wall of the EGR flow path in the body and information on the temperature of the cooling water passing through the cooling water path, and the temperature of the flow path wall. When the temperature of the cooling water is lower than the temperature of the cooling water, the temperature of the flow path wall rises, and when the temperature of the flow path wall is higher than the temperature of the cooling water, the temperature of the cooling water is lower than the boiling point of the cooling water. The flow rate of the cooling water is controlled so that

これにより、流路壁の温度が冷却水の温度よりも低いときには、冷却水による加熱によって流路壁の温度を確実に上げることができる。
また、流路壁の温度が冷却水の温度よりも高いときには、流路壁から冷却水への伝熱により冷却水が加熱されて沸騰する虞がある。そこで、冷却水の温度が冷却水の沸点よりも低くなるように冷却水の流量を制御することで、冷却水の沸騰を防止して冷却水の性状変化を阻止することができる。 Thereby, when the temperature of the flow path wall is lower than the temperature of the cooling water, the temperature of the flow path wall can be reliably increased by heating with the cooling water.
Further, when the temperature of the flow path wall is higher than the temperature of the cooling water, the cooling water may be heated and boiled due to heat transfer from the flow path wall to the cooling water. Therefore, by controlling the flow rate of the cooling water so that the temperature of the cooling water is lower than the boiling point of the cooling water, it is possible to prevent boiling of the cooling water and to prevent changes in the properties of the cooling water.

（ａ）はＥＧＲ装置の構成図であり、（ｂ）は（ａ）のＡ−Ａ断面図であり、（ｃ）は（ａ）のＢ−Ｂ断面図である（実施例）。(A) is a block diagram of an EGR device, (b) is an AA cross-sectional view of (a), and (c) is a BB cross-sectional view of (a) (Example). （ａ）はＥＧＲ装置の構成図であり、（ｂ）は（ａ）のＣ−Ｃ断面図であり、（ｃ）は（ａ）のＤ−Ｄ断面図である（変形例）。(A) is a block diagram of an EGR device, (b) is a CC cross-sectional view of (a), and (c) is a DD cross-sectional view of (a) (modified example).

実施形態のＥＧＲ装置は、内燃機関に排気ガスを再循環するためのＥＧＲ流路の一部を形成するとともに、ＥＧＲ流路の周囲に内燃機関の冷却水が通る冷却水路を有するボディと、ボディに回転自在に支持され、ＥＧＲ流路を通る排気ガスの流量を増減するＥＧＲ弁と、ＥＧＲ弁を回転駆動する電動機と、冷却水路を通る冷却水の流量を増減する冷却水量調節手段と、冷却水量調節手段に指令を与えて冷却水の流量を制御する冷却水量制御手段とを備える。   An EGR device of an embodiment forms a part of an EGR flow path for recirculating exhaust gas to an internal combustion engine, and has a cooling water path through which cooling water of the internal combustion engine passes around the EGR flow path, An EGR valve that increases and decreases the flow rate of exhaust gas that passes through the EGR flow path, an electric motor that rotationally drives the EGR valve, a cooling water amount adjusting means that increases and decreases the flow rate of cooling water that passes through the cooling water channel, Cooling water amount control means for giving a command to the water amount adjusting means to control the flow rate of the cooling water.

また、冷却水量制御手段は、ボディにおけるＥＧＲ流路の流路壁の温度に関する情報、および、冷却水路を通る冷却水の温度に関する情報を把握し、流路壁の温度が冷却水の温度よりも低いときには、流路壁の温度が上昇するように、かつ、流路壁の温度が冷却水の温度よりも高いときには、冷却水の温度が冷却水の沸点よりも低くなるように、冷却水の流量を制御する。   The cooling water amount control means grasps information on the temperature of the flow path wall of the EGR flow path in the body and information on the temperature of the cooling water passing through the cooling water path, and the temperature of the flow path wall is lower than the temperature of the cooling water. When the temperature is low, the temperature of the cooling water is increased, and when the temperature of the flow path wall is higher than the temperature of the cooling water, the temperature of the cooling water is lower than the boiling point of the cooling water. Control the flow rate.

〔実施例の構成〕
実施例のＥＧＲ装置１の構成を図１に基づいて説明する。
ＥＧＲ装置１は、ＥＧＲガスの流量を増減するＥＧＲ弁２を内蔵する弁ユニット３と、ＥＧＲ弁２の動作を制御する制御ユニット（以下、ＥＣＵと呼ぶ。）４とを備え、ＥＧＲガスはクーラ（図示せず）によって冷却された後、弁ユニット３に供給されてＥＧＲ量を調節され、新気に混合される。 [Configuration of Example]
The configuration of the EGR device 1 according to the embodiment will be described with reference to FIG.
The EGR device 1 includes a valve unit 3 that incorporates an EGR valve 2 that increases or decreases the flow rate of EGR gas, and a control unit (hereinafter referred to as ECU) 4 that controls the operation of the EGR valve 2, and the EGR gas is a cooler. After being cooled by (not shown), it is supplied to the valve unit 3 to adjust the EGR amount and mixed with fresh air.

なお、ＥＣＵ４は、制御処理および演算処理を行うＣＰＵ、各種のデータおよびプログラム等を記憶するＲＯＭおよびＲＡＭ等の記憶装置、入力装置、ならびに出力装置等を含んで構成されるものであり、各種センサから入力される検出信号に基づき、弁ユニット３等の内燃機関（図示せず）に係わる機器の動作を制御するものである。   The ECU 4 includes a CPU that performs control processing and arithmetic processing, a storage device such as a ROM and a RAM that stores various data and programs, an input device, an output device, and the like. Based on the detection signal input from, the operation of equipment related to the internal combustion engine (not shown) such as the valve unit 3 is controlled.

弁ユニット３は、ＥＧＲガスの流量を増減するＥＧＲ弁２と、ＥＧＲ流路６の一部を形成してＥＧＲ弁２を回転自在に支持するボディ７と、ＥＧＲ弁２を回転駆動する電動機８とを備える。
ここで、ＥＧＲ弁２は、ＥＧＲ流路６に配置される弁体９と、弁体９に締結されて軸受１０を介してボディ７に回転自在に支持される弁軸１１とを有する。また、電動機８の出力軸（図示せず）と弁軸１１との間には歯車減速機（図示せず）が組み入れられ、電動機８の出力トルクが増幅されて弁軸１１に伝達される。また、ＥＣＵ４は、電動機８への通電量を制御することで、ＥＧＲ弁２を回転駆動してＥＧＲ量を制御する。 The valve unit 3 includes an EGR valve 2 that increases and decreases the flow rate of EGR gas, a body 7 that forms a part of the EGR flow path 6 and rotatably supports the EGR valve 2, and an electric motor 8 that rotationally drives the EGR valve 2. With.
Here, the EGR valve 2 includes a valve body 9 disposed in the EGR flow path 6 and a valve shaft 11 that is fastened to the valve body 9 and rotatably supported by the body 7 via a bearing 10. A gear reducer (not shown) is incorporated between the output shaft (not shown) of the electric motor 8 and the valve shaft 11, and the output torque of the electric motor 8 is amplified and transmitted to the valve shaft 11. Further, the ECU 4 controls the EGR amount by rotating the EGR valve 2 by controlling the amount of current supplied to the electric motor 8.

また、ボディ７には、ＥＧＲ流路６の周囲に内燃機関の冷却水が通る冷却水路１３が設けられ、冷却水路１３に冷却水を通水してボディ７を加熱することで、弁ユニット３における凝縮水の発生を防止してデポジットの堆積を抑制している。   Further, the body 7 is provided with a cooling water passage 13 through which the cooling water of the internal combustion engine passes around the EGR passage 6, and the valve unit 3 is heated by passing the cooling water through the cooling water passage 13 to heat the body 7. This prevents the formation of condensed water and suppresses the accumulation of deposits.

すなわち、ＥＧＲガスはクーラによって冷却された後、弁ユニット３に供給されるため、弁ユニット３では、ＥＧＲガスに含まれる水分が凝縮して凝縮水が発生しやすい。そして、ＥＧＲガスに含まれる水分が凝縮すると、ＥＧＲガスに同伴されるＨＣ等が凝縮水とともに弁ユニット３内に溜まってデポジットが発生する虞がある。そこで、ボディ７に冷却水路１３を設けてボディ７を冷却水により加熱することで、弁ユニット３における凝縮水の発生を防止してデポジットの堆積を抑制している。   That is, since the EGR gas is cooled by the cooler and then supplied to the valve unit 3, the valve unit 3 easily condenses water contained in the EGR gas and generates condensed water. When moisture contained in the EGR gas is condensed, there is a possibility that HC and the like accompanying the EGR gas are accumulated in the valve unit 3 together with the condensed water, and deposits are generated. Therefore, the cooling water passage 13 is provided in the body 7 and the body 7 is heated by the cooling water, so that the condensed water is prevented from being generated in the valve unit 3 and the accumulation of deposits is suppressed.

ここで、冷却水路１３は、例えば、電動機８で発生する銅損等の発熱を冷却水に吸収させるための溜まり１４、ＥＧＲ流路６を包囲するように冷却水を導いてＥＧＲ流路６の流路壁１５の近傍を加熱する加熱路１６等からなる。そして、ボディ７に流入した冷却水は、溜まり１４に流入した後に加熱路１６へ供給され、ボディ７から流出する。   Here, for example, the cooling water passage 13 guides the cooling water so as to surround the EGR flow path 6 by enclosing the EGR flow path 6 so that the cooling water absorbs heat such as copper loss generated in the electric motor 8. It comprises a heating path 16 for heating the vicinity of the flow path wall 15 and the like. The cooling water that has flowed into the body 7 flows into the pool 14, is then supplied to the heating path 16, and flows out of the body 7.

また、ＥＧＲ装置１は、冷却水路１３を通る冷却水の流量を増減する冷却水量調節手段１８を備え、ＥＣＵ４は、冷却水量調節手段１８に指令を与えて冷却水の流量を制御する冷却水量制御手段として機能する。
冷却水量調節手段１８は、例えば、冷却水の流量を増減する弁体（図示せず）、および、弁体を回転駆動する電動機（図示せず）を有する流量制御弁であり、ＥＣＵ４は、例えば、電動機への通電量を制御することで弁体を回転駆動し、ボディ７に供給すべき冷却水の流量を増減する。 Further, the EGR device 1 includes a cooling water amount adjusting means 18 that increases or decreases the flow rate of the cooling water passing through the cooling water passage 13, and the ECU 4 gives a command to the cooling water amount adjusting means 18 to control the flow rate of the cooling water. Functions as a means.
The cooling water amount adjusting means 18 is, for example, a flow rate control valve having a valve body (not shown) that increases or decreases the flow rate of the cooling water and an electric motor (not shown) that rotationally drives the valve body. The valve element is rotationally driven by controlling the energization amount to the electric motor, and the flow rate of the cooling water to be supplied to the body 7 is increased or decreased.

また、ＥＣＵ４は、例えば、流路壁１５の近傍のボディ７に装着された温度センサ１９から検出信号の入力を受け、流路壁１５の温度を把握する。さらに、ＥＣＵ４は、例えば、冷却水量調節手段１８の上流側で冷却水の温度を検出する温度センサ２０から検出信号の入力を受け、冷却水路１３を通る冷却水の温度に関する情報を把握する。   For example, the ECU 4 receives a detection signal from a temperature sensor 19 mounted on the body 7 in the vicinity of the flow path wall 15 and grasps the temperature of the flow path wall 15. Further, for example, the ECU 4 receives a detection signal from a temperature sensor 20 that detects the temperature of the cooling water on the upstream side of the cooling water amount adjusting means 18 and grasps information related to the temperature of the cooling water passing through the cooling water passage 13.

そして、ＥＣＵ４は、例えば、流路壁１５の温度が冷却水の温度よりも低いときには、流路壁１５の温度が上昇するように、かつ、流路壁１５の温度が冷却水の温度よりも高いときには、冷却水の温度が冷却水の沸点よりも低くなるように、冷却水の流量を制御する。すなわち、ＥＣＵ４は、流路壁１５の温度が冷却水の温度よりも低いときには、冷却水の流量を増やすように冷却水量調節手段１８に指令を与え、流路壁１５の温度が冷却水の温度よりも高いときには、冷却水の流量を減らすように冷却水量調節手段１８に指令を与える。   Then, for example, when the temperature of the flow path wall 15 is lower than the temperature of the cooling water, the ECU 4 increases the temperature of the flow path wall 15 and the temperature of the flow path wall 15 is lower than the temperature of the cooling water. When it is high, the flow rate of the cooling water is controlled so that the temperature of the cooling water is lower than the boiling point of the cooling water. That is, when the temperature of the flow path wall 15 is lower than the temperature of the cooling water, the ECU 4 gives a command to the cooling water amount adjusting means 18 so as to increase the flow rate of the cooling water. If it is higher, a command is given to the cooling water amount adjusting means 18 so as to reduce the flow rate of the cooling water.

また、ＥＣＵ４は、例えば、内燃機関の暖機前のように冷却水の温度が低い場合には、冷却水がボディ７の加熱の妨げにならないように冷却水の通水を停止する。これにより、ボディ７は、他の熱源（例えば、電動機８で発生する銅損等の発熱や、ＥＧＲガス自身が有する熱）により加熱される。なお、電動機８の発熱は、溜まり１４における冷却水を介してボディ７に伝達される。   In addition, when the temperature of the cooling water is low, for example, before warming up the internal combustion engine, the ECU 4 stops the flow of the cooling water so that the cooling water does not hinder the heating of the body 7. Thereby, the body 7 is heated by another heat source (for example, heat generation such as copper loss generated in the electric motor 8 or heat of the EGR gas itself). The heat generated by the electric motor 8 is transmitted to the body 7 through the cooling water in the pool 14.

〔実施例の効果〕
実施例のＥＧＲ装置１は、ボディ７に設けられた冷却水路１３を通る冷却水の流量を増減する冷却水量調節手段１８を備え、ＥＣＵ４は、冷却水量調節手段１８に指令を与えて冷却水の流量を制御する冷却水量制御手段として機能する。
これにより、例えば、内燃機関の暖機前のように冷却水の温度が低い場合には、冷却水がボディ７の加熱の妨げにならないように冷却水の通水を停止し、他の熱源（例えば、電動機８で発生する銅損等の発熱や、ＥＧＲガス自身が有する熱）を活用してボディ７を加熱することができる。このため、ＥＧＲ装置１の弁ユニット３において、凝縮水の発生を防止してデポジットの量を低減することで、ＥＧＲ弁２の固着防止に対する信頼性を高めることができる。 [Effects of Examples]
The EGR device 1 of the embodiment includes a cooling water amount adjusting means 18 that increases or decreases the flow rate of the cooling water passing through the cooling water passage 13 provided in the body 7, and the ECU 4 gives a command to the cooling water amount adjusting means 18 to give the cooling water amount. It functions as a cooling water amount control means for controlling the flow rate.
Thereby, for example, when the temperature of the cooling water is low as before the warm-up of the internal combustion engine, the cooling water flow is stopped so that the cooling water does not hinder the heating of the body 7, and other heat sources ( For example, the body 7 can be heated by utilizing heat such as copper loss generated in the electric motor 8 or heat of the EGR gas itself. For this reason, in the valve unit 3 of the EGR device 1, the reliability for preventing the EGR valve 2 from sticking can be improved by preventing the generation of condensed water and reducing the amount of deposit.

また、ＥＣＵ４は、ボディ７におけるＥＧＲ流路６の流路壁１５の温度に関する情報、および、冷却水路１３を通る冷却水の温度に関する情報を把握し、流路壁１５の温度が冷却水の温度よりも低いときには、流路壁１５の温度が上昇するように、かつ、流路壁１５の温度が冷却水の温度よりも高いときには、冷却水の温度が冷却水の沸点よりも低くなるように、冷却水の流量を制御する。   Further, the ECU 4 grasps information on the temperature of the flow path wall 15 of the EGR flow path 6 in the body 7 and information on the temperature of the cooling water passing through the cooling water path 13, and the temperature of the flow path wall 15 is the temperature of the cooling water. Is lower than the cooling water temperature, and when the temperature of the flow path wall 15 is higher than the cooling water temperature, the cooling water temperature is lower than the boiling point of the cooling water. Control the flow rate of cooling water.

これにより、流路壁１５の温度が冷却水の温度よりも低いときには、冷却水による加熱によって流路壁１５の温度を確実に上げることができる。
また、流路壁１５の温度が冷却水の温度よりも高いときには、流路壁１５から冷却水への伝熱により冷却水が加熱されて沸騰する虞がある。そこで、冷却水の温度が冷却水の沸点よりも低くなるように冷却水の流量を制御することで、冷却水の沸騰を防止して冷却水の性状変化を阻止することができる。 Thereby, when the temperature of the flow path wall 15 is lower than the temperature of the cooling water, the temperature of the flow path wall 15 can be reliably increased by heating with the cooling water.
Further, when the temperature of the flow path wall 15 is higher than the temperature of the cooling water, the cooling water may be heated and boiled due to heat transfer from the flow path wall 15 to the cooling water. Therefore, by controlling the flow rate of the cooling water so that the temperature of the cooling water is lower than the boiling point of the cooling water, it is possible to prevent boiling of the cooling water and to prevent changes in the properties of the cooling water.

〔変形例〕
ＥＧＲ装置１の態様は、実施例に限定されず種々の変形例を考えることができる。
例えば、実施例のＥＧＲ装置１によれば、冷却水路１３の加熱路１６は、分岐することなく、ＥＧＲ流路６を包囲するように冷却水を導いていたが、図２に示すように、冷却水路１３の加熱路１６を複数に分岐させてＥＧＲ流路６を包囲した後、合流させてもよい。 [Modification]
The aspect of the EGR apparatus 1 is not limited to an Example, Various modifications can be considered.
For example, according to the EGR device 1 of the embodiment, the heating path 16 of the cooling water path 13 led the cooling water so as to surround the EGR flow path 6 without branching, but as shown in FIG. The heating channel 16 of the cooling water channel 13 may be branched into a plurality of parts to surround the EGR channel 6 and then merged.

また、実施例のＥＧＲ装置１によれば、ＥＣＵ４は、ボディ７に装着された温度センサ１９から得られる検出信号に基づき、ＥＧＲ流路６の流路壁１５の温度を把握していたが、流路壁１５の温度以外の内燃機関の運転状態を示すパラメータ（例えば、内燃機関の回転数や負荷）を検出するセンサから得られる検出信号に基づき、ＥＧＲ流路６の流路壁１５の温度を把握してもよい。   Further, according to the EGR device 1 of the embodiment, the ECU 4 grasps the temperature of the flow path wall 15 of the EGR flow path 6 based on the detection signal obtained from the temperature sensor 19 attached to the body 7. The temperature of the flow path wall 15 of the EGR flow path 6 based on a detection signal obtained from a sensor that detects an operating condition of the internal combustion engine other than the temperature of the flow path wall 15 (for example, the rotational speed or load of the internal combustion engine). You may know.

１ ＥＧＲ装置
２ ＥＧＲ弁
４ ＥＣＵ（冷却水量制御手段）
６ ＥＧＲ流路
７ ボディ
８ 電動機
１３ 冷却水路
１５ 流路壁
１８ 冷却水量調節手段 1 EGR device 2 EGR valve 4 ECU (cooling water amount control means)
6 EGR flow path 7 Body 8 Electric motor 13 Cooling water channel 15 Channel wall 18 Cooling water amount adjusting means

Claims (2)

内燃機関に排気ガスを再循環するためのＥＧＲ流路の一部を形成するとともに、前記ＥＧＲ流路の周囲に前記内燃機関の冷却水が通る冷却水路を有するボディと、
このボディに回転自在に支持され、前記ＥＧＲ流路を通る排気ガスの流量を増減するＥＧＲ弁と、
このＥＧＲ弁を回転駆動する電動機と、
前記冷却水路を通る冷却水の流量を増減する冷却水量調節手段と、
この冷却水量調節手段に指令を与えて前記冷却水の流量を制御する冷却水量制御手段とを備えるＥＧＲ装置。 Forming a part of an EGR flow path for recirculating exhaust gas to the internal combustion engine, and a body having a cooling water path through which the cooling water of the internal combustion engine passes around the EGR flow path;
An EGR valve that is rotatably supported by the body and increases or decreases the flow rate of exhaust gas passing through the EGR flow path;
An electric motor that rotationally drives the EGR valve;
A cooling water amount adjusting means for increasing or decreasing the flow rate of the cooling water passing through the cooling water channel;
An EGR apparatus comprising cooling water amount control means for giving a command to the cooling water amount adjusting means to control the flow rate of the cooling water. 請求項１に記載のＥＧＲ装置において、
前記冷却水量制御手段は、
前記ボディにおける前記ＥＧＲ流路の流路壁の温度に関する情報、および、前記冷却水路を通る冷却水の温度に関する情報を把握し、
前記流路壁の温度が前記冷却水の温度よりも低いときには、前記流路壁の温度が上昇するように、かつ、前記流路壁の温度が前記冷却水の温度よりも高いときには、前記冷却水の温度が冷却水の沸点よりも低くなるように、前記冷却水の流量を制御することを特徴とするＥＧＲ装置。 The EGR device according to claim 1,
The cooling water amount control means includes:
Information on the temperature of the channel wall of the EGR channel in the body, and information on the temperature of the cooling water passing through the cooling water channel,
When the temperature of the flow path wall is lower than the temperature of the cooling water, the temperature of the flow path wall rises, and when the temperature of the flow path wall is higher than the temperature of the cooling water, the cooling An EGR apparatus that controls the flow rate of the cooling water so that the temperature of the water is lower than the boiling point of the cooling water.
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