JPH10169514A - Egr device with egr cooler - Google Patents
Egr device with egr coolerInfo
- Publication number
- JPH10169514A JPH10169514A JP8333948A JP33394896A JPH10169514A JP H10169514 A JPH10169514 A JP H10169514A JP 8333948 A JP8333948 A JP 8333948A JP 33394896 A JP33394896 A JP 33394896A JP H10169514 A JPH10169514 A JP H10169514A
- Authority
- JP
- Japan
- Prior art keywords
- egr
- egr cooler
- cooling water
- cooler
- engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は過給機付ディーゼル
エンジンなどにおいて、ＮＯx の排出量を低減するため
のＥＧＲ（排気再循環）を行う時に、ＥＧＲガスの温度
を下げてシリンダ内に入る空気量を増加させて、エンジ
ンの燃焼を良好に保つＥＧＲクーラー付ＥＧＲ装置に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reducing the temperature of EGR gas and reducing the amount of air entering a cylinder when performing EGR (exhaust gas recirculation) for reducing NOx emissions in a turbocharged diesel engine or the like. The present invention relates to an EGR device with an EGR cooler that increases the amount of fuel and keeps the combustion of the engine good.
【０００２】[0002]
【従来の技術】ディーゼルエンジンなどの排ガス対策に
おいて、排気ガス中のＮＯx の排出量を低減するため
に、排気ガスの一部を吸気に再循環することで、燃焼温
度を低く抑えてＮＯx の生成を抑制するＥＧＲが有効で
あることが知られ、広く実用化されている。2. Description of the Related Art In measures against exhaust gas from diesel engines and the like, in order to reduce the amount of NOx emitted from exhaust gas, a part of the exhaust gas is recirculated to intake air to suppress the combustion temperature and generate NOx. It is known that EGR which suppresses the effect is effective and has been widely put to practical use.
【０００３】このＥＧＲにおいては、排気ガスの再循環
量の割合を増加してＥＧＲ率を高めることによって、Ｎ
Ｏx の排出量を低減できるが、シリンダー内には、新気
にＥＧＲガスが混入した混合ガスが吸入されることにな
り、ＥＧＲガスが増加する分だけ新気量が減少するの
で、燃焼が悪くなってスモークの増加を招くという問題
がある。[0003] In this EGR, by increasing the ratio of the amount of recirculated exhaust gas to increase the EGR rate, N
Although the amount of Ox emission can be reduced, a mixed gas in which EGR gas is mixed into fresh air is sucked into the cylinder, and the amount of fresh air decreases by an amount corresponding to the increase in EGR gas. There is a problem that smoke is increased.
【０００４】そのため、燃焼の悪化を防止しながらＥＧ
Ｒガス量を増加するために、ＥＧＲガスを冷却してその
体積を減少させることにより、シリンダー内に入る混合
ガス中のＥＧＲガスの占める体積を少なくして、シリン
ダー内に入る空気量を十分に確保する方法が採用されて
いる。そして、図５に示すように、排気マニホールド３
と吸気管路５を連結するＥＧＲ管路４に水冷式のＥＧＲ
クーラー２を設置して、エンジンの水冷ジャケットから
導入した冷却水Ｗを循環させて、ＥＧＲガスＧと熱交換
することにより、ＥＧＲガスＧの冷却を行い、この冷却
されたＥＧＲガスＧを新気Ａに混合してＥＧＲを行って
いる。[0004] Therefore, while preventing deterioration of combustion, EG
In order to increase the amount of the R gas, the volume of the EGR gas in the mixed gas entering the cylinder is reduced by cooling the EGR gas to reduce the volume thereof, thereby sufficiently increasing the amount of air entering the cylinder. The method of securing is adopted. Then, as shown in FIG.
Water-cooled EGR is connected to the EGR line 4
The EGR gas G is cooled by installing the cooler 2 and circulating the cooling water W introduced from the water cooling jacket of the engine to exchange heat with the EGR gas G. A is mixed with A to perform EGR.
【０００５】このＥＧＲクーラー２は、通常、図６に示
すような多管式の熱交換器が使用されているが、この多
管式の熱交換器は、円筒形の胴内の両端に２枚の管板23
を配置し、これらの管板23の間に多数の細い伝熱パイプ
21を配設して、この伝熱パイプ21の内側にＥＧＲガスを
通過させ、外側の冷却水循環部22にエンジン冷却水を循
環させて、ＥＧＲガスを冷却している。As the EGR cooler 2, a multi-tube heat exchanger as shown in FIG. 6 is usually used. The multi-tube heat exchanger has two cylindrical heat exchangers at both ends thereof. Pieces of sheet 23
Place a number of thin heat transfer pipes between these tubesheets 23
The EGR gas is cooled by passing the EGR gas through the heat transfer pipe 21 and circulating the engine cooling water through the cooling water circulation unit 22 on the outside.
【０００６】また、伝熱効率の向上と伝熱面積の増加を
図り、冷却効果を上げて、ＥＧＲクーラーを軽量化及び
小型化するために、伝熱パイプを薄肉にすると共に、細
くして本数を多くしている。そのため、これらの伝熱パ
イプは比較的、破損し易いという欠点を持っている。Further, in order to improve the heat transfer efficiency and the heat transfer area, to increase the cooling effect, and to reduce the weight and size of the EGR cooler, the heat transfer pipes are made thinner and thinner to reduce the number thereof. Have many. Therefore, these heat transfer pipes have a disadvantage that they are relatively easily broken.
【０００７】[0007]
【発明が解決しようとする課題】一方、このような水冷
式のＥＧＲクーラーを用いる場合には、粗悪な燃料や冷
却水の使用による腐蝕の問題や、冷却水不足によってＥ
ＧＲクーラー内で冷却水が沸騰を起こした場合、伝熱パ
イプ自体またはその取り付け部が破損する可能性があ
る。On the other hand, when such a water-cooled type EGR cooler is used, there is a problem of corrosion due to the use of poor fuel or cooling water and a shortage of cooling water due to a shortage of cooling water.
When the cooling water is boiled in the GR cooler, the heat transfer pipe itself or its attachment may be damaged.
【０００８】伝熱パイプの破損が起きると、冷却水がＥ
ＧＲガス通路側に漏れて、シリンダ内に吸引され、潤滑
油に混入し潤滑不良を起こしたり、漏れが大量になると
ウォーターハンマーにより最悪の場合エンジンの破損に
つながる。本発明は、上述の問題を解決するためになさ
れたもので、その目的とするところは、万一ＥＧＲクー
ラーの漏水が生じた場合に、これを検出してＥＧＲガス
通路を閉鎖して、漏出した冷却水がエンジン内に入るの
を防止して、エンジンの破損を避けることができるＥＧ
Ｒクーラー付ＥＧＲ装置を提供することである。[0008] When the heat transfer pipe is broken, the cooling water becomes E
The gas leaks to the GR gas passage side and is sucked into the cylinder and mixed into the lubricating oil to cause poor lubrication. If the amount of the leak is large, the worst case may be damage to the engine by a water hammer. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. An object of the present invention is to detect the occurrence of a leak from an EGR cooler, close the EGR gas passage, and perform a leak. EG that can prevent the cooled cooling water from entering the engine and avoid engine damage
It is to provide an EGR device with an R cooler.
【０００９】さらに、ＥＧＲクーラーの漏水が生じた場
合に、これを検出してＥＧＲガス通路を閉鎖して、漏出
した冷却水がエンジン内に入るのを防止すると共に、Ｅ
ＧＲクーラー内の冷却水を排出して、漏出水によるエン
ジンの破損とＥＧＲクーラーの破損の拡大を防止できる
ＥＧＲクーラー付ＥＧＲ装置を提供する。Further, when a leak of the EGR cooler occurs, it is detected and the EGR gas passage is closed to prevent the leaked coolant from entering the engine.
Provided is an EGR device with an EGR cooler that discharges cooling water from a GR cooler and prevents damage to an engine and damage to an EGR cooler due to leaked water.
【００１０】[0010]
【課題を解決するための手段】以上のような目的を達成
するためのＥＧＲクーラー付ＥＧＲ装置は、エンジンの
排気マニホールドと吸気管路とを水冷式のＥＧＲクーラ
ーを有するＥＧＲ管路で連結し、該ＥＧＲ管路の前記Ｅ
ＧＲクーラーの上流及び下流にそれぞれＥＧＲバルブを
設け、更に、前記ＥＧＲクーラーの下流側に温度センサ
ーを設けて、該温度センサーがＥＧＲクーラー内の漏水
を検知した時に、前記ＥＧＲバルブを閉止して、エンジ
ン内に前記漏水が浸入するのを防止するように構成す
る。In order to achieve the above object, an EGR device with an EGR cooler connects an exhaust manifold of an engine and an intake line with an EGR line having a water-cooled EGR cooler. The E of the EGR line
EGR valves are respectively provided upstream and downstream of the GR cooler, and further, a temperature sensor is provided downstream of the EGR cooler, and when the temperature sensor detects a leak in the EGR cooler, the EGR valve is closed. The leakage is prevented from entering the engine.
【００１１】また、エンジンの排気マニホールドと吸気
管路とを水冷式のＥＧＲクーラーを有するＥＧＲ管路で
連結し、該ＥＧＲ管路の前記ＥＧＲクーラーの上流及び
下流にそれぞれＥＧＲバルブと、前記ＥＧＲクーラーの
冷却水循環管路に冷却水遮断弁とを設け、更に、前記Ｅ
ＧＲクーラー内の冷却水循環部に大気開放弁を有する大
気開放管路とを設けると共に、前記ＥＧＲクーラーの下
流側に温度センサーを配設し、該温度センサーが前記Ｅ
ＧＲクーラー内の漏水を検知した時に、前記ＥＧＲバル
ブと前記冷却水遮断弁を閉弁すると共に、前記大気開放
弁を開弁して、エンジン内に前記漏水が浸入するのを防
止すると共に、前記ＥＧＲクーラー内の冷却水を排出す
るように構成する。An exhaust manifold and an intake pipe of the engine are connected by an EGR pipe having a water-cooled EGR cooler, and an EGR valve and an EGR cooler are respectively provided upstream and downstream of the EGR cooler in the EGR pipe. A cooling water shutoff valve in the cooling water circulation line of
An air release pipe having an air release valve is provided in a cooling water circulating portion in the GR cooler, and a temperature sensor is disposed downstream of the EGR cooler.
When detecting a water leak in the GR cooler, the EGR valve and the cooling water cutoff valve are closed, and the air release valve is opened to prevent the water leak from entering the engine. The cooling water in the EGR cooler is configured to be discharged.
【００１２】あるいは、エンジンの排気マニホールドと
吸気管路とを水冷式のＥＧＲクーラーを有するＥＧＲ管
路で連結し、該ＥＧＲ管路の前記ＥＧＲクーラーの上流
及び下流にそれぞれＥＧＲバルブと、前記ＥＧＲクーラ
ーの冷却水循環管路に冷却水遮断弁とを設け、更に、前
記冷却水循環管路の前記冷却水遮断弁とＥＧＲクーラー
の間に大気開放弁を有する大気開放管路を分岐して設け
ると共に、前記ＥＧＲクーラーの下流側に温度センサー
を配設し、該温度センサーが前記ＥＧＲクーラー内の漏
水を検知した時に、前記ＥＧＲバルブと前記冷却水遮断
弁を閉弁すると共に、前記大気開放弁を開弁して、エン
ジン内に前記漏水が浸入するのを防止すると共に、前記
ＥＧＲクーラー内の冷却水を排出するように構成する。Alternatively, the exhaust manifold of the engine and the intake pipe are connected by an EGR pipe having a water-cooled EGR cooler, and an EGR valve and an EGR cooler are respectively provided upstream and downstream of the EGR cooler in the EGR pipe. A cooling water shutoff valve is provided in the cooling water circulation pipe, and an air release pipe having an air release valve is provided between the cooling water cutoff valve and the EGR cooler of the cooling water circulation pipe in a branched manner. A temperature sensor is provided downstream of the EGR cooler, and when the temperature sensor detects water leakage in the EGR cooler, the EGR valve and the cooling water cutoff valve are closed, and the air release valve is opened. Then, it is configured to prevent the leakage of water into the engine and to discharge the cooling water in the EGR cooler.
【００１３】[0013]
【発明の実施の形態】以下、図面を用いて、本発明の実
施形態を説明する。本発明の第１の実施の形態に係わる
ＥＧＲクーラー付ＥＧＲ装置は、ＥＧＲクーラー２の下
流に設けた温度センサー13によって、漏水によるＥＧＲ
ガスの温度低下を利用して漏水の発生を検知して、ＥＧ
Ｒ管路４を閉鎖するものであり、図１に示すように構成
とされている。Embodiments of the present invention will be described below with reference to the drawings. The EGR device with an EGR cooler according to the first embodiment of the present invention employs a temperature sensor 13 provided downstream of the EGR cooler 2 to detect EGR caused by water leakage.
Detecting the occurrence of water leakage using the temperature drop of the gas,
The R pipe 4 is closed, and is configured as shown in FIG.
【００１４】つまり、エンジン１の排気マニホールド３
と吸気管路５とを連結するＥＧＲ管路４を設けて、この
ＥＧＲ管路４に水冷式のＥＧＲクーラ２を配設し、更
に、このＥＧＲクーラー２の上流及び下流にＥＧＲバル
ブ７ａ，７ｂをそれぞれ設ける。そして、ＥＧＲクーラ
ー２の下流側のＥＧＲガス通路内に、漏水によるＥＧＲ
ガスの温度低下を検知するための温度センサー12を設け
て、この検出信号をコントローラ13に入力する。That is, the exhaust manifold 3 of the engine 1
An EGR pipe 4 is provided to connect the EGR cooler 2 to the EGR pipe 4. EGR valves 7 a and 7 b are provided upstream and downstream of the EGR cooler 2. Are provided. Then, EGR due to water leakage is introduced into the EGR gas passage downstream of the EGR cooler 2.
A temperature sensor 12 for detecting a decrease in gas temperature is provided, and this detection signal is input to a controller 13.
【００１５】そして、このコントローラ13は、温度セン
サー12から入力されるの検出信号を、予め入力されてい
るデータと比較して、ＥＧＲクーラー２内に漏水が発生
したか、否かを判断し、その判断に従って、ＥＧＲバル
ブ７ａ，７ｂの開弁・閉弁のコントロールを行うように
構成する。この温度センサー12が検出するＥＧＲクーラ
ー２を通過した後のＥＧＲガス温度は、正常運転時には
エンジン１の運転状態毎にある一定の範囲内に納まるの
で、エンジン１の運転状態を示す、回転数・燃料流量・
ブースト圧・冷却水温度などと、その時の温度センサー
12の場所のＥＧＲガス温度との関係を示すデータを収集
してマップ化し、このデータを予めコントローラ13にメ
モリしておく。The controller 13 compares the detection signal input from the temperature sensor 12 with data input in advance to determine whether or not water leakage has occurred in the EGR cooler 2. According to the determination, the opening and closing of the EGR valves 7a and 7b is controlled. The EGR gas temperature after passing through the EGR cooler 2 detected by the temperature sensor 12 falls within a certain range for each operating state of the engine 1 during normal operation. Fuel flow rate
Boost pressure, cooling water temperature, etc. and temperature sensor at that time
Data indicating the relationship with the EGR gas temperature at the 12 locations is collected and mapped, and this data is stored in the controller 13 in advance.
【００１６】そして、冷却水がＥＧＲ管路４に漏出した
時には、少量の漏水でも蒸発する時に多量の蒸発潜熱を
奪うのでＥＧＲガス温度は急激に低下して、正常運転時
の範囲より下になるので、マップ化したデータと比較す
ることで冷却水が浸入したか否かを容易に判断すること
ができる。また、このコントローラ13は、漏水の発生が
なく正常にＥＧＲを行っている時には、ＥＧＲクーラー
２のいずれか一方のＥＧＲバルブ７ｂ又は７ａを全開に
して、他方のＥＧＲバルブ７ａ又は７ｂの弁開度をコン
トロールして、ＥＧＲガス流量を調整する。When the cooling water leaks into the EGR line 4, a large amount of latent heat of vaporization is taken away when a small amount of water evaporates, so that the temperature of the EGR gas drops rapidly and falls below the normal operation range. Therefore, it can be easily determined whether or not the cooling water has entered by comparing with the mapped data. When the EGR is normally performed without water leakage, the controller 13 opens one of the EGR valves 7b or 7a of the EGR cooler 2 and opens the other EGR valve 7a or 7b. Is controlled to adjust the EGR gas flow rate.
【００１７】そして、コントローラ13がＥＧＲガス温度
の異常低下を検知して、冷却水が漏れてＥＧＲガス通路
内に浸入したと判断した場合には、直ちに両方のＥＧＲ
バルブ７ａ，７ｂを閉止して、漏出した冷却水がエンジ
ン１の内部に入るのを防止する。更に、この異常事態が
生じたことを、警告灯の点灯や警告音の発生により、運
転者に知らせる。When the controller 13 detects an abnormal decrease in the EGR gas temperature and determines that the cooling water has leaked and has entered the EGR gas passage, both the EGR gases are immediately discharged.
The valves 7a and 7b are closed to prevent the leaked cooling water from entering the inside of the engine 1. Further, the driver is notified that this abnormal situation has occurred by lighting a warning lamp or generating a warning sound.
【００１８】以上のような構成により、ＥＧＲクーラー
２の伝熱パイプ21に腐蝕孔が形成されて、ＥＧＲクーラ
ー２内に冷却水が漏出してＥＧＲガス温度が急激に低下
した時に、この温度低下を温度センサー12が検知してＥ
ＧＲ管路４を閉鎖することによって、漏出した冷却水が
エンジン１内に浸入することを防止し、エンジン１の破
損を防止できる。また、ＥＧＲクーラー２が漏水した時
でも、ＥＧＲを停止してエンジンの運転を継続できるの
で、エンジンの停止などから派生する２次トラブルを避
けることができる。With the above-described configuration, when a corrosion hole is formed in the heat transfer pipe 21 of the EGR cooler 2 and the cooling water leaks into the EGR cooler 2 and the temperature of the EGR gas suddenly decreases, the temperature decreases. Is detected by the temperature sensor 12 and E
By closing the GR pipe 4, it is possible to prevent the leaked cooling water from entering the engine 1 and prevent the engine 1 from being damaged. Further, even when the EGR cooler 2 leaks water, the EGR can be stopped and the operation of the engine can be continued, so that secondary troubles resulting from the stop of the engine and the like can be avoided.
【００１９】また、警告灯の点灯や警告音の発生によ
り、運転者はＥＧＲクーラー２に漏水が生じたことを知
ることができるので、適切な修理をすることができる。
次に、第２の実施の形態は、ＥＧＲクーラー２の下流に
設けた温度センサー13によってＥＧＲガスの温度低下を
検知して、ＥＧＲ管路４を閉鎖すると共にＥＧＲクーラ
ー２内の冷却水を排出するものであり、図２及び図３に
示すように構成されている。Further, the driver can know that the EGR cooler 2 has leaked water by turning on the warning light or generating the warning sound, so that appropriate repair can be performed.
Next, in the second embodiment, the temperature sensor 13 provided downstream of the EGR cooler 2 detects a decrease in the temperature of the EGR gas, closes the EGR line 4 and discharges the cooling water in the EGR cooler 2. The configuration is as shown in FIGS. 2 and 3.
【００２０】つまり、エンジン１の排気マニホールド３
と吸気管路５とを水冷式のＥＧＲクーラー２を有するＥ
ＧＲ管路４で連結し、このＥＧＲクーラー２の上流及び
下流にそれぞれＥＧＲバルブ７ａ，７ｂを設ける。そし
て更に、ＥＧＲクーラー２の冷却水循環部22にエンジン
冷却水を供給している冷却水循環管路８ａ，８ｂに、冷
却水遮断弁10ａ，10ｂをそれぞれ設けると共に、ＥＧＲ
クーラー２の冷却水循環部22の上下部分に大気開放弁11
ａ，11ｂを有する大気開放管路９ａ，９ｂを配設する。That is, the exhaust manifold 3 of the engine 1
E having a water-cooled EGR cooler 2
EGR valves 7a and 7b are provided upstream and downstream of the EGR cooler 2, respectively. Further, cooling water shutoff valves 10a and 10b are provided in cooling water circulation pipes 8a and 8b that supply engine cooling water to the cooling water circulation unit 22 of the EGR cooler 2, respectively.
An air release valve 11 is provided above and below the cooling water circulating portion 22 of the cooler 2.
The open-to-atmosphere pipes 9a and 9b having a and 11b are provided.
【００２１】そして、ＥＧＲクーラー２の下流側に温度
センサー12を設け、この検出信号をコントローラ13に入
力する。コントローラ13は、検出信号と予め入力されて
いるデータと比較して、ＥＧＲクーラー２内に漏水が発
生したか、否かを判断する。この判断に従って、正常運
転時には冷却水遮断弁10ａ，10ｂを開弁すると共に大気
開放弁11ａ，11ｂを閉弁して、エンジンからの冷却水を
ＥＧＲクーラー２の冷却水循環部22に循環させ、また、
漏水発生時には両方のＥＧＲバルブ７ａ，７ｂを閉止し
てＥＧＲ管路４を閉鎖して冷却水がエンジン１の内部に
入るのを防止すると共に、同時に、冷却水遮断弁10ａ，
10ｂを閉弁して冷却水がＥＧＲクーラー２に供給される
のを停止し、また、大気開放弁11ａ，11ｂを開弁してＥ
ＧＲクーラー２内の水を排出する。A temperature sensor 12 is provided downstream of the EGR cooler 2, and the detection signal is input to a controller 13. The controller 13 determines whether or not water leakage has occurred in the EGR cooler 2 by comparing the detection signal with previously input data. According to this determination, during normal operation, the cooling water shutoff valves 10a and 10b are opened and the atmosphere release valves 11a and 11b are closed, and the cooling water from the engine is circulated to the cooling water circulation unit 22 of the EGR cooler 2; ,
When a water leak occurs, both the EGR valves 7a and 7b are closed to close the EGR line 4 to prevent the cooling water from entering the inside of the engine 1, and at the same time, the cooling water cutoff valves 10a and 10a
The valve 10b is closed to stop the supply of the cooling water to the EGR cooler 2, and the air release valves 11a and 11b are opened to stop E.
The water in the GR cooler 2 is discharged.
【００２２】このような構成により、ガス通路内に漏水
が発生した時にＥＧＲ管路４を閉鎖すると共に、ＥＧＲ
クーラー２内の冷却水を排出できるので、漏出した冷却
水がエンジン１内に浸入するのを確実に防止できると共
に、ＥＧＲクーラー２内に冷却水が充満するのを防止し
て、ＥＧＲクーラー２の破損の拡大を防止できる。ま
た、第３の実施の形態は、第２の実施の形態とほぼ同じ
であるが、大気開放弁11ａ，11ｂを有する大気開放通路
９ａ，９ｂをＥＧＲクーラー２ではなく、図４に示すよ
うに、この冷却水遮断弁10ａ，10ｂとＥＧＲクーラー２
との間の冷却水循環管路８ａ，８ｂに配設する。このよ
うな構成は、ＥＧＲクーラー２の上下面に冷却水の出入
口が設けられている場合に用いることができる。With this configuration, when water leaks in the gas passage, the EGR line 4 is closed and the EGR line 4 is closed.
Since the cooling water in the cooler 2 can be discharged, the leaked cooling water can be reliably prevented from entering the engine 1, and the cooling water can be prevented from being filled in the EGR cooler 2. The spread of damage can be prevented. Further, the third embodiment is almost the same as the second embodiment except that the air release passages 9a and 9b having the air release valves 11a and 11b are not provided in the EGR cooler 2 but as shown in FIG. , The cooling water cutoff valves 10a, 10b and the EGR cooler 2
The cooling water circulation pipes 8a and 8b are disposed between them. Such a configuration can be used when the inlet and outlet of the cooling water are provided on the upper and lower surfaces of the EGR cooler 2.
【００２３】このように構成すると、温度センサー12で
ＥＧＲガス温度の低下を検知した時に、ＥＧＲ管路４の
閉鎖とＥＧＲクーラー２内の冷却水の排出ができて、漏
出水のエンジン１内への浸入を確実に防止できると共
に、ＥＧＲクーラー２内への冷却水の充満を防止して、
ＥＧＲクーラー２の破損の拡大を防止できる。その上、
冷却水循環管路８ａ，８ｂの配管側に大気解放管路９
ａ，９ｂを連結すればよく、ＥＧＲクーラー２に大気解
放管路９ａ，９ｂを接続する必要がなくなるので、従来
技術のＥＧＲクーラー２をそのまま使用して配管できる
というメリットがある。With this configuration, when the temperature sensor 12 detects a decrease in the EGR gas temperature, the EGR line 4 can be closed and the cooling water in the EGR cooler 2 can be discharged. Infiltration of the cooling water into the EGR cooler 2 can be prevented,
It is possible to prevent the EGR cooler 2 from being damaged. Moreover,
Atmospheric release line 9 is provided on the piping side of cooling water circulation lines 8a and 8b.
a and 9b may be connected, and there is no need to connect the atmosphere release pipelines 9a and 9b to the EGR cooler 2. Therefore, there is an advantage that piping can be performed using the conventional EGR cooler 2 as it is.
【００２４】なお、正常運転時において冷却水が低水温
の時には、冷却水遮断弁10ａ，10ｂを閉弁にするとＥＧ
Ｒクーラー２内の過冷却を防止できるので、ＥＧＲガス
が露点以下になるのを防止できる。この場合には、エン
ジン１が暖機され冷却水温度が所定の水温以上になった
ら開弁して、通常の冷却水循環の状態にする。When the cooling water is at a low water temperature during normal operation, the cooling water cutoff valves 10a and 10b are closed to close the EG.
Since supercooling in the R cooler 2 can be prevented, it is possible to prevent the EGR gas from falling below the dew point. In this case, the valve is opened when the engine 1 is warmed up and the temperature of the cooling water becomes equal to or higher than a predetermined water temperature, and a state of normal cooling water circulation is established.
【００２５】[0025]
【発明の効果】上述したように請求項１の本発明のＥＧ
Ｒクーラー付ＥＧＲ装置によれば、ＥＧＲクーラーの下
流側に温度センサーを設けて、ＥＧＲクーラー内に冷却
水が漏出したことを検知して、ＥＧＲ管路を閉鎖できる
ので、エンジン内への漏出水の浸入を防止することがで
き、漏水によるエンジンの破損を防止できる。As described above, the EG according to the first aspect of the present invention is as described above.
According to the EGR device with the R cooler, the temperature sensor is provided on the downstream side of the EGR cooler to detect the leakage of the cooling water into the EGR cooler, and the EGR pipe can be closed. Can be prevented, and damage to the engine due to water leakage can be prevented.
【００２６】さらに、請求項２又は３の本発明のＥＧＲ
クーラー付ＥＧＲ装置によれば、ＥＧＲクーラー内に冷
却水が漏出したことを検知して、ＥＧＲ管路を閉鎖する
と共に、ＥＧＲクーラー内の冷却水を排出できるので、
漏出した冷却水がエンジンに浸入するを確実に防止でき
ると共に、ＥＧＲクーラーの破損の拡大を防止できる。Furthermore, the EGR of the present invention according to claim 2 or 3
According to the cooler-equipped EGR device, it is possible to detect the leakage of the cooling water into the EGR cooler, close the EGR line, and discharge the cooling water from the EGR cooler.
The leaked cooling water can be reliably prevented from entering the engine, and the EGR cooler can be prevented from being damaged.
【図１】本発明の第１の実施の形態のＥＧＲクーラー付
ＥＧＲ装置の構成図である。FIG. 1 is a configuration diagram of an EGR device with an EGR cooler according to a first embodiment of the present invention.
【図２】本発明の第２の実施の形態のＥＧＲクーラー付
ＥＧＲ装置の構成図である。FIG. 2 is a configuration diagram of an EGR device with an EGR cooler according to a second embodiment of the present invention.
【図３】本発明の第２の実施の形態のＥＧＲクーラーの
断面図である。FIG. 3 is a sectional view of an EGR cooler according to a second embodiment of the present invention.
【図４】本発明の第３の実施の形態のＥＧＲクーラーの
配管の構成図である。FIG. 4 is a configuration diagram of a pipe of an EGR cooler according to a third embodiment of the present invention.
【図５】従来技術におけるＥＧＲクーラー付ＥＧＲ装置
の構成図である。FIG. 5 is a configuration diagram of an EGR device with an EGR cooler according to the related art.
【図６】従来技術におけるＥＧＲクーラーの構成図であ
り、（ａ）は側面断面図であり、（ｂ）はＡ−Ａ断面図
である。FIG. 6 is a configuration diagram of an EGR cooler according to the related art, where (a) is a side sectional view and (b) is an AA sectional view.
１ … エンジン ２ … ＥＧＲクーラ
ー ３ … 排気マニホールド ４ … ＥＧＲ管路 ５ … 吸気管路 ６ … 吸気マニホー
ルド ７ａ，７ｂ … ＥＧＲ弁 ８ａ，８ｂ … 冷却
水循環管路 ９ａ，９ｂ … 大気開放管路 10ａ，10ｂ … 冷却
水遮断弁 11ａ，11ｂ … 大気開放弁 12 … 温度センサー 13 … コントローラ 21 … 伝熱パイプ 22 … 冷却水循環部 23 … 管板 Ａ … 新気 Ｇ … ＥＧＲガス Ｗ … 冷却水DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... EGR cooler 3 ... Exhaust manifold 4 ... EGR line 5 ... Intake line 6 ... Intake manifold 7a, 7b ... EGR valve 8a, 8b ... Cooling water circulation line 9a, 9b ... Atmosphere opening line 10a, 10b … Cooling water cutoff valves 11a, 11b… Atmospheric release valve 12… Temperature sensor 13… Controller 21… Heat transfer pipe 22… Cooling water circulating part 23… Tube plate A… Fresh air G… EGR gas W… Cooling water
Claims (3)
（３）と吸気管路（５）とを水冷式のＥＧＲクーラー
（２）を有するＥＧＲ管路（４）で連結し、該ＥＧＲ管
路（４）の前記ＥＧＲクーラー（２）の上流及び下流に
それぞれＥＧＲバルブ（７ａ，７ｂ）を設け、更に、前
記ＥＧＲクーラー（２）の下流側に温度センサー（12）
を設けて、該温度センサー（12）がＥＧＲクーラー
（２）内の漏水を検知した時に、前記ＥＧＲバルブ（７
ａ，７ｂ）を閉止して、エンジン（１）内に前記漏水が
浸入するのを防止するように構成したＥＧＲクーラー付
ＥＧＲ装置。An exhaust manifold (3) of an engine (1) and an intake pipe (5) are connected by an EGR pipe (4) having a water-cooled EGR cooler (2), and the EGR pipe (4) is connected to the exhaust manifold (3). EGR valves (7a, 7b) are respectively provided upstream and downstream of the EGR cooler (2), and a temperature sensor (12) is provided downstream of the EGR cooler (2).
The EGR valve (7) is provided when the temperature sensor (12) detects water leakage in the EGR cooler (2).
a, an EGR device with an EGR cooler configured to close the a, 7b) to prevent the water from entering the engine (1).
（３）と吸気管路（５）とを水冷式のＥＧＲクーラー
（２）を有するＥＧＲ管路（４）で連結し、該ＥＧＲ管
路（４）の前記ＥＧＲクーラー（２）の上流及び下流に
それぞれＥＧＲバルブ（７ａ，７ｂ）と、前記ＥＧＲク
ーラー（１）の冷却水循環管路（８ａ，８ｂ）に冷却水
遮断弁（10ａ，10ｂ）とを設け、更に、前記ＥＧＲクー
ラー（２）内の冷却水循環部（22）に大気開放弁（11
ａ，11ｂ）を有する大気開放管路（９ａ，９ｂ）とを設
けると共に、前記ＥＧＲクーラー（２）の下流側に温度
センサー（12）を配設し、該温度センサー（12）が前記
ＥＧＲクーラー（２）内の漏水を検知した時に、前記Ｅ
ＧＲバルブ（７ａ，７ｂ）と前記冷却水遮断弁（10ａ，
10ｂ）を閉弁すると共に、前記大気開放弁（11ａ，11
ｂ）を開弁するように構成したＥＧＲクーラー付ＥＧＲ
装置。2. An exhaust manifold (3) of an engine (1) and an intake pipe (5) are connected by an EGR pipe (4) having a water-cooled EGR cooler (2). EGR valves (7a, 7b) upstream and downstream of the EGR cooler (2), and cooling water shutoff valves (10a, 10b) in the cooling water circulation pipes (8a, 8b) of the EGR cooler (1). An air release valve (11) is provided in the cooling water circulating section (22) in the EGR cooler (2).
a, 11b) and an open-to-atmosphere pipe (9a, 9b), and a temperature sensor (12) downstream of the EGR cooler (2), wherein the temperature sensor (12) is connected to the EGR cooler. (2) When water leakage is detected,
The GR valve (7a, 7b) and the cooling water cutoff valve (10a,
10b) is closed, and the atmosphere release valves (11a, 11b) are closed.
b) EGR with EGR cooler configured to open valve
apparatus.
（３）と吸気管路（５）とを水冷式のＥＧＲクーラー
（２）を有するＥＧＲ管路（４）で連結し、該ＥＧＲ管
路（４）の前記ＥＧＲクーラー（２）の上流及び下流に
それぞれＥＧＲバルブ（７ａ，７ｂ）と、前記ＥＧＲク
ーラー（１）の冷却水循環管路（８ａ，８ｂ）に冷却水
遮断弁（10ａ，10ｂ）とを設け、更に、前記冷却水循環
管路（８ａ，８ｂ）の前記冷却水遮断弁（10ａ，10ｂ）
とＥＧＲクーラー（２）の間に大気開放弁（11ａ，11
ｂ）を有する大気開放管路（９ａ，９ｂ）を分岐して設
けると共に、前記ＥＧＲクーラー（２）の下流側に温度
センサー（12）を配設し、該温度センサー（12）が前記
ＥＧＲクーラー（２）内の漏水を検知した時に、前記Ｅ
ＧＲバルブ（７ａ，７ｂ）と前記冷却水遮断弁（10ａ，
10ｂ）を閉弁すると共に、前記大気開放弁（11ａ，11
ｂ）を開弁するように構成したＥＧＲクーラー付ＥＧＲ
装置。3. An exhaust manifold (3) of an engine (1) and an intake pipe (5) are connected by an EGR pipe (4) having a water-cooled EGR cooler (2), and the EGR pipe (4) is connected to the exhaust manifold (3). EGR valves (7a, 7b) upstream and downstream of the EGR cooler (2), and cooling water shutoff valves (10a, 10b) in the cooling water circulation pipes (8a, 8b) of the EGR cooler (1). The cooling water shut-off valve (10a, 10b) of the cooling water circulation pipe (8a, 8b) is further provided.
Between the EGR cooler (2) and the air release valve (11a, 11
b) and an open-to-atmosphere pipe (9a, 9b) having a branch, and a temperature sensor (12) disposed downstream of the EGR cooler (2), wherein the temperature sensor (12) is connected to the EGR cooler. (2) When water leakage is detected,
The GR valve (7a, 7b) and the cooling water cutoff valve (10a,
10b) is closed, and the atmosphere release valves (11a, 11b) are closed.
b) EGR with EGR cooler configured to open valve
apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33394896A JP3637708B2 (en) | 1996-12-13 | 1996-12-13 | EGR equipment with EGR cooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33394896A JP3637708B2 (en) | 1996-12-13 | 1996-12-13 | EGR equipment with EGR cooler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10169514A true JPH10169514A (en) | 1998-06-23 |
| JP3637708B2 JP3637708B2 (en) | 2005-04-13 |
Family
ID=18271779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33394896A Expired - Fee Related JP3637708B2 (en) | 1996-12-13 | 1996-12-13 | EGR equipment with EGR cooler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3637708B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6360702B1 (en) | 1999-11-10 | 2002-03-26 | Isuzu Motors Limited | EGR and oil cooling system |
| KR100892506B1 (en) | 2007-12-12 | 2009-04-10 | 기아자동차주식회사 | A protecting apparatus of engine using detecting leak of an egr cooler |
| US7607301B2 (en) * | 2005-08-30 | 2009-10-27 | Denso Corporation | Exhaust gas heat exchanger, exhaust gas recirculation system, and exhaust gas heat exchanging method |
| KR100992757B1 (en) | 2008-05-08 | 2010-11-05 | 현대자동차주식회사 | Engine protecting device causing EGR cooler fail condition in vehicle |
| WO2011111205A1 (en) * | 2010-03-11 | 2011-09-15 | トヨタ自動車株式会社 | Egr device for internal combustion engine |
| JP2012132394A (en) * | 2010-12-22 | 2012-07-12 | Denso Corp | Exhaust heat exchanging device |
| KR101274233B1 (en) * | 2007-12-14 | 2013-06-11 | 현대자동차주식회사 | Exhaust gas recirculation cooler control device |
| JP2014025361A (en) * | 2012-07-24 | 2014-02-06 | Ihi Shibaura Machinery Corp | Engine |
| KR101405752B1 (en) * | 2008-07-22 | 2014-06-10 | 현대자동차주식회사 | Particulate matters cleaning device for exhaust gas recirculation |
| DE102018205604B3 (en) | 2018-04-13 | 2019-05-02 | Bayerische Motoren Werke Aktiengesellschaft | Method and apparatus for testing the durability of an EGR cooler for an internal combustion engine |
| WO2020026289A1 (en) * | 2018-07-30 | 2020-02-06 | 三菱電機株式会社 | Exhaust gas recirculation valve and exhaust gas recirculation device |
-
1996
- 1996-12-13 JP JP33394896A patent/JP3637708B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6360702B1 (en) | 1999-11-10 | 2002-03-26 | Isuzu Motors Limited | EGR and oil cooling system |
| US7607301B2 (en) * | 2005-08-30 | 2009-10-27 | Denso Corporation | Exhaust gas heat exchanger, exhaust gas recirculation system, and exhaust gas heat exchanging method |
| KR100892506B1 (en) | 2007-12-12 | 2009-04-10 | 기아자동차주식회사 | A protecting apparatus of engine using detecting leak of an egr cooler |
| KR101274233B1 (en) * | 2007-12-14 | 2013-06-11 | 현대자동차주식회사 | Exhaust gas recirculation cooler control device |
| KR100992757B1 (en) | 2008-05-08 | 2010-11-05 | 현대자동차주식회사 | Engine protecting device causing EGR cooler fail condition in vehicle |
| KR101405752B1 (en) * | 2008-07-22 | 2014-06-10 | 현대자동차주식회사 | Particulate matters cleaning device for exhaust gas recirculation |
| WO2011111205A1 (en) * | 2010-03-11 | 2011-09-15 | トヨタ自動車株式会社 | Egr device for internal combustion engine |
| JP5321732B2 (en) * | 2010-03-11 | 2013-10-23 | トヨタ自動車株式会社 | EGR device for internal combustion engine |
| JP2012132394A (en) * | 2010-12-22 | 2012-07-12 | Denso Corp | Exhaust heat exchanging device |
| JP2014025361A (en) * | 2012-07-24 | 2014-02-06 | Ihi Shibaura Machinery Corp | Engine |
| DE102018205604B3 (en) | 2018-04-13 | 2019-05-02 | Bayerische Motoren Werke Aktiengesellschaft | Method and apparatus for testing the durability of an EGR cooler for an internal combustion engine |
| WO2020026289A1 (en) * | 2018-07-30 | 2020-02-06 | 三菱電機株式会社 | Exhaust gas recirculation valve and exhaust gas recirculation device |
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