JP2017002760A - EGR device - Google Patents

EGR device Download PDF

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Publication number
JP2017002760A
JP2017002760A JP2015115399A JP2015115399A JP2017002760A JP 2017002760 A JP2017002760 A JP 2017002760A JP 2015115399 A JP2015115399 A JP 2015115399A JP 2015115399 A JP2015115399 A JP 2015115399A JP 2017002760 A JP2017002760 A JP 2017002760A
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egr
passage
exhaust gas
cooling water
bypass
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勝大 水田
Katsuhiro Mizuta
勝大 水田
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Suzuki Motor Corp
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Suzuki Motor 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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Abstract

PROBLEM TO BE SOLVED: To obtain an EGR device which raises a temperature of cooling water by an EGR cooler in an early stage, and can promote the warmup of an internal combustion engine when warming up the internal combustion engine.SOLUTION: An EGR device comprises: an EGR passage which makes an exhaust gas flow back to an intake passage; an EGR cooler which is arranged in the EGR passage, and cools the exhaust gas by heat-exchange with cooling water; a bypass passage which connects a downstream side of the EGR cooler in the EGR passage and an exhaust passage; a bypass valve which controls the exhaust gas so as to flow into either of the intake passage and the bypass passage; and a bypass valve control part which controls the bypass valve so that the exhaust gas which has passed the EGR cooler flows into the bypass passage when warming up the internal combustion engine.SELECTED DRAWING: Figure 1

Description

この発明はＥＧＲ装置に係り、特にＥＧＲクーラーで排気ガスと冷却水との熱交換を実行して冷却水の昇温を促進するＥＧＲ装置に関するものである。   The present invention relates to an EGR device, and more particularly to an EGR device that promotes the temperature rise of cooling water by performing heat exchange between exhaust gas and cooling water with an EGR cooler.

ＥＧＲ装置は、内燃機関から排出された排気ガスを再燃焼させるために、この排気通路内の排気ガスの一部を吸気通路に戻すものであり、「排気ガス還流装置」とも称される。
以下に開示される特許文献１においては、ＥＧＲクーラーに導入される冷却水路を２つ設け、そのうちの１つは排気ガスと熱交換を行った冷却水をＥＧＲクーラーに導入する冷却水通路であり、冷却水の暖機が望まれる場合は該通路からＥＧＲクーラーに冷却水を導入する技術が公開されている。 The EGR device returns a part of the exhaust gas in the exhaust passage to the intake passage in order to reburn the exhaust gas discharged from the internal combustion engine, and is also referred to as an “exhaust gas recirculation device”.
In Patent Document 1 disclosed below, two cooling water passages introduced into the EGR cooler are provided, and one of them is a cooling water passage for introducing the cooling water heat-exchanged with the exhaust gas into the EGR cooler. In the case where it is desired to warm up the cooling water, a technique for introducing the cooling water from the passage to the EGR cooler is disclosed.

特開２０１１−１７２９６号公報JP 2011-17296 A

しかしながら、従来のＥＧＲ装置において、上記特許文献１に開示される技術では、排気ガスで冷却水を昇温するため熱交換器が必要となり、コストアップとなるため改善が望まれていた。   However, in the conventional EGR device, the technique disclosed in Patent Document 1 requires a heat exchanger to raise the temperature of the cooling water with the exhaust gas, which increases the cost and has been desired to be improved.

この発明は、内燃機関を暖機する場合にＥＧＲクーラーで冷却水を早期に昇温し、内燃機関の暖機を促進し得るＥＧＲ装置を実現することを目的とする。   It is an object of the present invention to realize an EGR device that can quickly increase the temperature of cooling water with an EGR cooler when warming up an internal combustion engine, and promote warm-up of the internal combustion engine.

そこで、この発明は、上述不都合を除去するために、排気ガスを吸気通路に還流するＥＧＲ通路と、このＥＧＲ通路に設けられた、冷却水との熱交換によって前記排気ガスを冷却するＥＧＲクーラーと、前記ＥＧＲ通路における前記ＥＧＲクーラーの下流側と排気通路とを接続するバイパス通路と、前記排気ガスを前記吸気通路と前記バイパス通路とのいずれかに流入するよう制御するバイパス弁と、内燃機関を暖機する場合、前記ＥＧＲクーラーを通過した排気ガスが前記バイパス通路に流入するようバイパス弁を制御するバイパス弁制御部とを備えたことを特徴する。   Therefore, in order to eliminate the above disadvantages, the present invention provides an EGR passage that recirculates the exhaust gas to the intake passage, and an EGR cooler that is provided in the EGR passage and cools the exhaust gas by heat exchange with cooling water. A bypass passage connecting the downstream side of the EGR cooler in the EGR passage and the exhaust passage, a bypass valve for controlling the exhaust gas to flow into either the intake passage or the bypass passage, and an internal combustion engine When the engine is warmed up, a bypass valve control unit is provided that controls the bypass valve so that the exhaust gas that has passed through the EGR cooler flows into the bypass passage.

この発明によれば、内燃機関を暖機する場合、ＥＧＲクーラーで冷却水が排気ガスによって昇温され、排気ガスが排気通路に流入するため、前記ＥＧＲクーラーで冷却水を早期に昇温して内燃機関の暖機を促進することができる。   According to the present invention, when the internal combustion engine is warmed up, the cooling water is heated by the exhaust gas by the EGR cooler, and the exhaust gas flows into the exhaust passage. Therefore, the cooling water is quickly heated by the EGR cooler. Warming up of the internal combustion engine can be promoted.

図１はＥＧＲ装置の制御用フローチャートである。（実施例）FIG. 1 is a flowchart for controlling the EGR apparatus. (Example) 図２はＥＧＲ装置の構成図である。（実施例）FIG. 2 is a configuration diagram of the EGR apparatus. (Example)

以下図面に基づいてこの発明の実施例を詳細に説明する。   Embodiments of the present invention will be described below in detail with reference to the drawings.

図１及び図２はこの発明の実施例を示すものである。
図２において、１は車両に搭載される内燃機関である。
この内燃機関１には、吸気通路２と排気通路３とがそれぞれ連通している。
また、前記内燃機関１は、この内燃機関１から排出された排気ガスを再燃焼させるＥＧＲ装置４を備えている。
このＥＧＲ装置４は、前記内燃機関１の前記排気通路３から排気ガスを前記吸気通路２へ還流するＥＧＲ通路５と、このＥＧＲ通路５内を流れる排気ガスを調整するＥＧＲ弁６と、前記ＥＧＲ通路５に設けられた、冷却水との熱交換によって前記排気ガスを冷却するＥＧＲクーラー７とを備えている。
このとき、前記ＥＧＲ通路５は、一端側を前記排気通路３に備えられた触媒８よりも下流側の排気通路３に連通し、他端側をスロットル弁９と吸気マニホルド１０との間の前記吸気通路２に連通して排気ガスを吸気通路２に還流している。
前記ＥＧＲ弁６は、前記ＥＧＲ通路５の前記排気通路３との連通部位の近くに配置している。
また、前記ＥＧＲ装置４のＥＧＲクーラー７は、前記ＥＧＲ弁６よりも下流側の前記ＥＧＲ通路５に配置している。 1 and 2 show an embodiment of the present invention.
In FIG. 2, reference numeral 1 denotes an internal combustion engine mounted on a vehicle.
The internal combustion engine 1 communicates with an intake passage 2 and an exhaust passage 3.
The internal combustion engine 1 is provided with an EGR device 4 for reburning the exhaust gas discharged from the internal combustion engine 1.
The EGR device 4 includes an EGR passage 5 that recirculates exhaust gas from the exhaust passage 3 of the internal combustion engine 1 to the intake passage 2, an EGR valve 6 that adjusts exhaust gas flowing through the EGR passage 5, and the EGR And an EGR cooler provided in the passage for cooling the exhaust gas by heat exchange with cooling water.
At this time, one end side of the EGR passage 5 communicates with the exhaust passage 3 on the downstream side of the catalyst 8 provided in the exhaust passage 3, and the other end side is between the throttle valve 9 and the intake manifold 10. The exhaust gas is recirculated to the intake passage 2 in communication with the intake passage 2.
The EGR valve 6 is disposed near the communication portion of the EGR passage 5 with the exhaust passage 3.
Further, the EGR cooler 7 of the EGR device 4 is disposed in the EGR passage 5 on the downstream side of the EGR valve 6.

前記ＥＧＲ装置４は、前記ＥＧＲ通路５における前記ＥＧＲクーラー７の下流側と前記排気通路３とを接続するバイパス通路１１と、前記排気ガスを前記吸気通路２とバイパス通路１１とのいずれかに流入するよう制御するバイパス弁１２とを備えている。
前記バイパス通路１１は、前記ＥＧＲクーラー７よりも下流側の前記ＥＧＲ通路５の途中部位を前記ＥＧＲ弁６よりも下流側の前記排気通路３に連通している。
前記バイパス弁１２は、前記ＥＧＲ通路５と前記バイパス通路１１の上流側との連通部位に配置し、ＥＧＲ通路５からの排気ガスを前記吸気通路２側とバイパス通路１１の下流側と連通された前記排気通路３側とのいずれかに流入するよう開閉制御する。
具体的には、前記バイパス弁１２は、前記ＥＧＲ通路５において前記吸気通路２と前記排気通路１１とに向かう分岐に備えられており、バイパス弁１２が開放状態のときには排気ガスは前記ＥＧＲクーラー７を通過後、バイパス通路１１を経由して排気通路３に流入し、バイパス弁１２が閉鎖状態のときには排気ガスはＥＧＲクーラー７を通過後吸気通路２に流入する。 The EGR device 4 includes a bypass passage 11 connecting the downstream side of the EGR cooler 7 in the EGR passage 5 and the exhaust passage 3, and the exhaust gas flows into either the intake passage 2 or the bypass passage 11. And a bypass valve 12 for controlling the operation.
The bypass passage 11 communicates an intermediate portion of the EGR passage 5 downstream of the EGR cooler 7 to the exhaust passage 3 downstream of the EGR valve 6.
The bypass valve 12 is disposed at a communication portion between the EGR passage 5 and the upstream side of the bypass passage 11, and exhaust gas from the EGR passage 5 is communicated with the intake passage 2 side and the downstream side of the bypass passage 11. Opening / closing control is performed so as to flow into either of the exhaust passages 3 side.
Specifically, the bypass valve 12 is provided at a branch in the EGR passage 5 toward the intake passage 2 and the exhaust passage 11. When the bypass valve 12 is in an open state, the exhaust gas is supplied to the EGR cooler 7. After passing, the exhaust gas flows into the exhaust passage 3 via the bypass passage 11, and when the bypass valve 12 is in the closed state, the exhaust gas flows into the intake passage 2 after passing through the EGR cooler 7.

前記ＥＧＲ装置４は、制御手段（「ＥＣＵ」ともいう。）１３を備えている。
この制御手段１３は、前記スロットル弁９の開度検出信号やその他の車両情報１４、前記内燃機関１の冷却水の温度を検出する冷却水温度センサ１５からの検出信号などを入力する一方、前記ＥＧＲ装置４のＥＧＲ弁６を開閉制御するＥＧＲ弁制御部１６と、前記バイパス弁１２を開閉制御するバイパス弁制御部１７とを備えている。
このバイパス弁制御部１７は、前記内燃機関１を暖機する場合、前記ＥＧＲクーラー７を通過した排気ガスが前記バイパス通路１１に流入するよう前記バイパス弁１２を開放制御している。
これにより、前記内燃機関１を暖機する場合、前記ＥＧＲクーラー７で冷却水が排気ガスによって昇温され、排気ガスが前記バイパス通路１１を経て前記排気通路３に流入するため、ＥＧＲクーラー７で冷却水を早期に昇温して前記内燃機関１の暖機を促進することができる。 The EGR device 4 includes control means (also referred to as “ECU”) 13.
The control means 13 inputs an opening detection signal of the throttle valve 9, other vehicle information 14, a detection signal from a cooling water temperature sensor 15 for detecting the temperature of the cooling water of the internal combustion engine 1, and the like. An EGR valve control unit 16 that controls opening and closing of the EGR valve 6 of the EGR device 4 and a bypass valve control unit 17 that controls opening and closing of the bypass valve 12 are provided.
When the internal combustion engine 1 is warmed up, the bypass valve control unit 17 controls the opening of the bypass valve 12 so that the exhaust gas that has passed through the EGR cooler 7 flows into the bypass passage 11.
Thereby, when the internal combustion engine 1 is warmed up, the cooling water is heated by the exhaust gas in the EGR cooler 7 and the exhaust gas flows into the exhaust passage 3 through the bypass passage 11. The temperature of the cooling water can be raised at an early stage to promote warming up of the internal combustion engine 1.

前記バイパス弁制御部１７は、冷却水の温度が所定値未満である場合に前記ＥＧＲクーラー７を通過した排気ガスが前記バイパス通路１１に流入するよう前記バイパス弁１２を制御する。
つまり、前記バイパス弁制御部１７は、前記冷却水温度センサ１５からの検出信号などを入力し、冷却水の温度が所定値Ｔ１未満たる、
冷却水温度＜Ｔ１
である場合に、前記バイパス弁１２を開放し、前記ＥＧＲクーラー７を通過した排気ガスが前記バイパス通路１１に流入するように制御する。
これにより、冷却水の温度が低い場合、つまり、所定値Ｔ１未満の場合には、排気ガスによって冷却水が昇温され、排気ガスが前記バイパス通路１１を経て前記排気通路３に流入するため、前記ＥＧＲクーラー７で冷却水を早期に昇温して前記内燃機関１の暖機を促進することができる。 The bypass valve control unit 17 controls the bypass valve 12 so that the exhaust gas that has passed through the EGR cooler 7 flows into the bypass passage 11 when the temperature of the cooling water is less than a predetermined value.
That is, the bypass valve control unit 17 inputs a detection signal from the cooling water temperature sensor 15 and the temperature of the cooling water falls below a predetermined value T1.
Cooling water temperature <T1
In this case, the bypass valve 12 is opened, and the exhaust gas that has passed through the EGR cooler 7 is controlled to flow into the bypass passage 11.
Thereby, when the temperature of the cooling water is low, that is, below the predetermined value T1, the cooling water is heated by the exhaust gas, and the exhaust gas flows into the exhaust passage 3 through the bypass passage 11, The EGR cooler 7 can raise the temperature of the cooling water at an early stage to promote warming up of the internal combustion engine 1.

次に、図１の前記ＥＧＲ装置４の制御用フローチャートに沿って作用を説明する。   Next, the operation will be described along the control flowchart of the EGR device 4 of FIG.

前記ＥＧＲ装置４の制御用プログラムがスタート（１０１）すると、前記内燃機関１の冷却水温度が所定値Ｔ１未満、つまり、
冷却水温度＜Ｔ１
であるか否かの判断（１０２）に移行する。
この判断（１０２）においては、前記冷却水温度センサ１５からの検出信号を前記制御手段１３に入力し、所定値Ｔ１未満であるか否かを判定している。
判断（１０２）がＹＥＳで、前記内燃機関１の冷却水温度が所定値Ｔ１未満、つまり、
冷却水温度＜Ｔ１
の場合には、前記ＥＧＲ弁６を開放させる処理（１０３）に移行する。
この処理（１０３）においては、前記制御手段１３の前記ＥＧＲ弁制御部１６によって前記ＥＧＲ装置４の前記ＥＧＲ弁６を開放するように制御し、一端側の前記排気通路３から前記ＥＧＲ通路５内に排気ガスの一部を流入させる。
このとき、前記ＥＧＲ通路５に流入した排気ガスは、前記ＥＧＲクーラー７を通過するため、冷却水と熱交換を行い、冷却水が昇温される。
また、前記ＥＧＲ弁６を開放させる処理（１０３）の後には、前記バイパス弁１２を開放させる処理（１０４）に移行する。
この処理（１０４）においては、前記制御手段１３のバイパス弁制御部１７によって前記バイパス弁１２を開放するように制御し、排気ガスを前記吸気通路２へ流入させることなく、前記ＥＧＲクーラー７を通過した排気ガスを前記バイパス通路１１を経て、前記排気通路３に戻して冷却水の温度を早期に昇温するよう制御される。
その後に、後述するＥＧＲ装置４の制御用プログラムがエンド（１０９）に移行する。
上述の前記内燃機関１の冷却水温度が所定値Ｔ１未満、つまり、
冷却水温度＜Ｔ１
であるか否かの判断（１０２）において、判断（１０２）がＮＯで、前記内燃機関１の冷却水温度が所定値Ｔ１以上、つまり、
冷却水温度≧Ｔ１
の場合には、ＥＧＲ導入を行うか否かの判断（１０５）に移行する。
この判断（１０５）においては、冷却水温度が所定値Ｔ１以上であるため、冷却水を昇温する必要がないと判断し、通常のＥＧＲ導入判定を行っている。
具体的には、例えば冷却水の水温と吸気温に基づいて、ＥＧＲを導入するか否かを決定する。
上記条件以外にも、一般的なＥＧＲ制御に基づいてＥＧＲ弁開度が制御される。
そして、判断（１０５）がＹＥＳの場合には、ＥＧＲ弁開度制御の処理（１０６）に移行する。
この処理（１０６）においては、前記制御手段１３のＥＧＲ弁制御部１６によって前記ＥＧＲ装置４のＥＧＲ弁６の開度を制御している。
また、ＥＧＲ弁開度制御の処理（１０６）の後には、前記バイパス弁１２を閉鎖させる処理（１０７）に移行する。
この処理（１０７）においては、前記制御手段１３のバイパス弁制御部１７によって前記バイパス弁１２が閉鎖するように制御し、排気ガスを前記吸気通路２へ還流させる。
その後に、前記ＥＧＲ装置４の制御用プログラムがエンド（１０９）に移行する。
上述のＥＧＲ導入を行うか否かの判断（１０５）がＮＯの場合には、前記ＥＧＲ弁６を閉鎖させる処理（１０８）に移行する。
この処理（１０８）においては、前記制御手段１３のＥＧＲ弁制御部１６によって前記ＥＧＲ装置４のＥＧＲ弁６を閉鎖するように制御し、一端側の前記排気通路３から前記ＥＧＲ通路５内への排気ガスの流入を阻止している。
このとき、ＥＧＲを導入しないと判定されたことにより、冷却水を昇温する必要もＥＧＲを導入する必要もないため、前記ＥＧＲ弁６が閉鎖状態に制御され、その後に、前記ＥＧＲ装置４の制御用プログラムがエンド（１０９）に移行して本ルーチンを終了する。
上記制御によって、冷却水の水温が低いときには、前記ＥＧＲクーラー７に排気ガスを流入させて冷却水と熱交換を行わせると共に、排気ガスを前記吸気通路２に流入させることなく前記排気通路３に流入させることで、熱交換器を設けることなく前記ＥＧＲクーラー７で冷却水を早期に昇温することが可能となる。 When the control program of the EGR device 4 starts (101), the cooling water temperature of the internal combustion engine 1 is less than a predetermined value T1, that is,
Cooling water temperature <T1
It shifts to judgment (102) of whether or not.
In this determination (102), a detection signal from the cooling water temperature sensor 15 is input to the control means 13, and it is determined whether or not it is less than a predetermined value T1.
When the determination (102) is YES, the coolant temperature of the internal combustion engine 1 is less than a predetermined value T1, that is,
Cooling water temperature <T1
In this case, the process proceeds to the process (103) for opening the EGR valve 6.
In this process (103), the EGR valve control section 16 of the control means 13 controls the EGR valve 6 of the EGR device 4 to be opened, and the exhaust passage 3 on one end side in the EGR passage 5 is controlled. A part of the exhaust gas is allowed to flow into
At this time, since the exhaust gas flowing into the EGR passage 5 passes through the EGR cooler 7, heat exchange with the cooling water is performed, and the cooling water is heated.
After the process (103) for opening the EGR valve 6, the process proceeds to the process (104) for opening the bypass valve 12.
In this process (104), the bypass valve control unit 17 of the control means 13 controls the bypass valve 12 to open, and the exhaust gas passes through the EGR cooler 7 without flowing into the intake passage 2. The exhaust gas is returned to the exhaust passage 3 through the bypass passage 11 and controlled so as to raise the temperature of the cooling water at an early stage.
Thereafter, a control program for the EGR device 4 described later shifts to the end (109).
The cooling water temperature of the internal combustion engine 1 is less than a predetermined value T1, that is,
Cooling water temperature <T1
In the determination (102) of whether or not, the determination (102) is NO and the cooling water temperature of the internal combustion engine 1 is equal to or higher than a predetermined value T1, that is,
Cooling water temperature ≧ T1
In this case, the process proceeds to determination (105) as to whether or not to introduce EGR.
In this determination (105), since the cooling water temperature is equal to or higher than the predetermined value T1, it is determined that it is not necessary to raise the temperature of the cooling water, and the normal EGR introduction determination is performed.
Specifically, for example, whether to introduce EGR is determined based on the coolant temperature and the intake air temperature.
In addition to the above conditions, the EGR valve opening is controlled based on general EGR control.
If the determination (105) is YES, the process proceeds to the EGR valve opening degree control process (106).
In this process (106), the opening degree of the EGR valve 6 of the EGR device 4 is controlled by the EGR valve control unit 16 of the control means 13.
After the EGR valve opening degree control process (106), the process proceeds to a process (107) for closing the bypass valve 12.
In this process (107), the bypass valve control unit 17 of the control means 13 controls the bypass valve 12 to close, and the exhaust gas is recirculated to the intake passage 2.
Thereafter, the control program of the EGR device 4 shifts to the end (109).
If the determination (105) on whether or not to introduce EGR is NO, the process proceeds to a process (108) for closing the EGR valve 6.
In this process (108), the EGR valve controller 16 of the control means 13 controls the EGR valve 6 of the EGR device 4 to close, and the exhaust passage 3 on one end side into the EGR passage 5 is controlled. The inflow of exhaust gas is blocked.
At this time, since it is determined that the EGR is not introduced, it is not necessary to raise the temperature of the cooling water or the EGR, so that the EGR valve 6 is controlled to be closed, and then the EGR device 4 The control program shifts to the end (109) and this routine ends.
With the above control, when the coolant temperature is low, the exhaust gas is caused to flow into the EGR cooler 7 to exchange heat with the coolant, and the exhaust gas is not allowed to flow into the intake passage 2 without flowing into the intake passage 2. By making it flow in, it becomes possible to raise the temperature of the cooling water at an early stage by the EGR cooler 7 without providing a heat exchanger.

１ 内燃機関
２ 吸気通路
３ 排気通路
４ ＥＧＲ装置
５ ＥＧＲ通路
６ ＥＧＲ弁
７ ＥＧＲクーラー
８ 触媒
９ スロットル弁
１０ 吸気マニホルド
１１ バイパス通路
１２ バイパス弁
１３ 制御手段（「ＥＣＵ」ともいう。）
１４ 車両情報
１５ 冷却水温度センサ
１６ ＥＧＲ弁制御部
１７ バイパス弁制御部 DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Intake passage 3 Exhaust passage 4 EGR apparatus 5 EGR passage 6 EGR valve 7 EGR cooler 8 Catalyst 9 Throttle valve 10 Intake manifold 11 Bypass passage 12 Bypass valve 13 Control means (also referred to as “ECU”)
14 Vehicle information 15 Cooling water temperature sensor 16 EGR valve control unit 17 Bypass valve control unit

Claims (2)

排気ガスを吸気通路に還流するＥＧＲ通路と、このＥＧＲ通路に設けられた、冷却水との熱交換によって前記排気ガスを冷却するＥＧＲクーラーと、前記ＥＧＲ通路における前記ＥＧＲクーラーの下流側と排気通路とを接続するバイパス通路と、前記排気ガスを前記吸気通路と前記バイパス通路とのいずれかに流入するよう制御するバイパス弁と、内燃機関を暖機する場合、前記ＥＧＲクーラーを通過した排気ガスが前記バイパス通路に流入するようバイパス弁を制御するバイパス弁制御部とを備えたことを特徴するＥＧＲ装置。   An EGR passage that recirculates exhaust gas to the intake passage; an EGR cooler that is provided in the EGR passage to cool the exhaust gas by heat exchange with cooling water; and an exhaust passage downstream of the EGR cooler in the EGR passage When the internal combustion engine is warmed up, the exhaust gas that has passed through the EGR cooler is discharged from the bypass passage that connects the exhaust gas to the intake passage and the bypass passage. An EGR device comprising: a bypass valve control unit that controls the bypass valve so as to flow into the bypass passage. 前記バイパス弁制御部は、前記冷却水の温度が所定値未満である場合に前記ＥＧＲクーラーを通過した排気ガスが前記バイパス通路に流入するよう前記バイパス弁を制御することを特徴とする請求項１に記載のＥＧＲ装置。   The bypass valve control unit controls the bypass valve so that exhaust gas that has passed through the EGR cooler flows into the bypass passage when the temperature of the cooling water is lower than a predetermined value. The EGR device described in 1.
JP2015115399A 2015-06-08 2015-06-08 EGR device Pending JP2017002760A (en)

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