JPH08135519A - Control method and control device for engine exhaust gas reflux device - Google Patents
Control method and control device for engine exhaust gas reflux deviceInfo
- Publication number
- JPH08135519A JPH08135519A JP6279002A JP27900294A JPH08135519A JP H08135519 A JPH08135519 A JP H08135519A JP 6279002 A JP6279002 A JP 6279002A JP 27900294 A JP27900294 A JP 27900294A JP H08135519 A JPH08135519 A JP H08135519A
- Authority
- JP
- Japan
- Prior art keywords
- aftercooler
- partial pressure
- outlet temperature
- egr
- water vapor
- 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
-
- 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
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/07—Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced downstream of the compressor
-
- 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
-
- 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
- F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
- F02B29/0437—Liquid cooled heat exchangers
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、エンジンの排気ガスの
一部を吸気系に還流する排気ガス還流装置の制御方法及
び制御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 control method and a control device for an exhaust gas recirculation device for recirculating a part of engine exhaust gas to an intake system.
【０００２】[0002]
【従来の技術】エンジンの排気ガス還流装置としては、
特開平４−１７５４５３号公報や特開平４−３０１１７
２号公報に示すように、アフタクーラを備えた吸気系と
排気系をＥＧＲ通路で連通し、そのＥＧＲ通路にＥＧＲ
フィルタとＥＧＲ冷却器を設けたものがある。2. Description of the Related Art As an engine exhaust gas recirculation device,
JP-A-4-175453 and JP-A-4-30117
As shown in Japanese Patent Laid-Open No. 2 (1994), an intake system and an exhaust system equipped with an aftercooler communicate with each other through an EGR passage, and the EGR passage is connected to the EGR passage.
Some have a filter and an EGR cooler.
【０００３】この排気ガス還流装置であれば、排気ガス
の一部を吸気系に還流して排気ガス中のＮＯX を低減で
きるし、エンジンの入口ガス温度が上がらないように還
流ガスの温度を制御して高出力が得られる。With this exhaust gas recirculation device, a portion of the exhaust gas can be recirculated to the intake system to reduce NO X in the exhaust gas, and the temperature of the recirculation gas can be controlled so that the temperature of the gas at the inlet of the engine does not rise. High output can be obtained by controlling.
【０００４】[0004]
【発明が解決しようとする課題】かかる排気ガス還流装
置であると、還流ガス中のＳＯ3 、ＮＯ4 はＥＧＲ冷却
器やアフタクーラによって結露した水に解け込み酸性水
溶液を生成する、この酸性水溶がエンジンに入るとエン
ジン本体内部を腐食させ、エンジン寿命を短くする。In such an exhaust gas recirculation system, SO 3 and NO 4 in the recirculation gas are dissolved into water condensed by the EGR cooler and the aftercooler to form an acidic aqueous solution. Entering the engine will corrode the inside of the engine and shorten the engine life.
【０００５】ＥＧＲ冷却器で生成する酸性水溶液はドレ
ーンパイプ等によって排出することは容易であるが、ア
フタクーラ出口で生成する酸性水溶液をドレーンすると
空気もモレて過給圧力が低下し、エンジン内部にも入り
やすい。そこで本発明は、アフタクーラ出口において酸
性水溶液を生成させないエンジンの排気ガス還流装置の
制御方法及び制御装置を提供することを目的とする。Although the acidic aqueous solution generated in the EGR cooler can be easily discharged through a drain pipe or the like, if the acidic aqueous solution generated at the outlet of the aftercooler is drained, the air also leaks and the supercharging pressure is lowered, so that the inside of the engine is also discharged. Easy to enter. Therefore, it is an object of the present invention to provide a control method and a control device for an exhaust gas recirculation device for an engine that does not generate an acidic aqueous solution at the aftercooler outlet.
【０００６】[0006]
【課題を解決するための手段】エンジン本体１の燃焼室
２に接続しアフタクーラ１１を有する吸気系７における
アフタクーラ１１入口側と、エンジン本体１の燃焼室２
に接続した排気系８をＥＧＲ通路１３で連通し、そのＥ
ＧＲ通路１３にＥＧＲ冷却器１６を設けたエンジンの排
気ガス還流装置において、前記アフタクーラ１１の冷却
能力を調整してそのアフタクーラ出口温度を、エンジン
回転速度と負荷により決定された必要なアフタクーラ出
口温度とし、その必要なアフタクーラ出口温度の飽和水
蒸気分圧と大気中の水蒸気分圧によりＥＧＲ出口飽和水
蒸気分圧を演算し、前記ＥＧＲ冷却器１６の冷却能力を
制御してそのＥＧＲ出口温度を前記演算したＥＧＲ出口
飽和水蒸気分圧に見合う必要温度以下とすることを特徴
とするエンジンの排気ガス還流装置の制御方法。エンジ
ン本体１の燃焼室２に接続しアフタクーラ１１を有する
吸気系７におけるアフタクーラ１１入口側と、エンジン
本体１の燃焼室２に接続した排気系８をＥＧＲ通路１３
で連通し、そのＥＧＲ通路１３にＥＧＲ冷却器１６を設
けたエンジンの排気ガス還流装置において、前記アフタ
クーラ１１の冷却能力を制御する第１の手段と、前記Ｅ
ＧＲ冷却器１６の冷却能力を制御する第２の手段と、エ
ンジン回転速度と負荷により必要なアフタクーラ出口温
度を算出する第３の手段と、アフタクーラ１１の出口温
度を必要なアフタクーラ出口温度とすべく第１の手段を
コントロールする第４の手段と、大気中の水蒸気分圧と
前記演算した必要なアフタクーラ出口温度による飽和水
蒸気分圧によりＥＧＲ冷却器出口飽和水蒸気分圧を演算
する第５の手段と、ＥＧＲ冷却器出口温度を前記ＥＧＲ
冷却器出口飽和水蒸気分圧に見合う必要温度とすべき前
記第２の手段をコントロールする第６の手段より構成し
たエンジンの排気ガス還流装置の制御装置。[Means for Solving the Problems] An inlet side of an aftercooler 11 in an intake system 7 having an aftercooler 11 connected to a combustion chamber 2 of an engine body 1 and a combustion chamber 2 of the engine body 1.
The exhaust system 8 connected to the
In an exhaust gas recirculation system for an engine in which an EGR cooler 16 is provided in the GR passage 13, the cooling capacity of the aftercooler 11 is adjusted so that the aftercooler outlet temperature is set to a required aftercooler outlet temperature determined by the engine speed and load. The EGR outlet saturated water vapor partial pressure is calculated from the required saturated water vapor partial pressure of the aftercooler outlet temperature and the water vapor partial pressure in the atmosphere, and the EGR outlet temperature is calculated by controlling the cooling capacity of the EGR cooler 16. A method for controlling an exhaust gas recirculation system for an engine, comprising setting a temperature equal to or lower than a required temperature commensurate with a saturated steam partial pressure at an EGR outlet. The aftercooler 11 inlet side of the intake system 7 having the aftercooler 11 connected to the combustion chamber 2 of the engine body 1 and the exhaust system 8 connected to the combustion chamber 2 of the engine body 1 are connected to the EGR passage 13
In the exhaust gas recirculation device for an engine, which is in communication with the EGR passage 13 and is provided with an EGR cooler 16 in the EGR passage 13, first means for controlling the cooling capacity of the aftercooler 11;
A second means for controlling the cooling capacity of the GR cooler 16, a third means for calculating a necessary aftercooler outlet temperature according to the engine speed and a load, and an outlet temperature of the aftercooler 11 for a required aftercooler outlet temperature. Fourth means for controlling the first means, and fifth means for calculating the EGR cooler outlet saturated water vapor partial pressure by the saturated water vapor partial pressure depending on the atmospheric water vapor partial pressure and the calculated necessary aftercooler outlet temperature. , EGR cooler outlet temperature to EGR
A control device for an exhaust gas recirculation device for an engine, comprising: a sixth means for controlling the second means, which should be at a necessary temperature that corresponds to the saturated steam partial pressure at the cooler outlet.
【０００７】[0007]
【作 用】大気中の水蒸気分圧とＥＧＲ冷却器出口飽
和水蒸気分圧の和が、アフタクーラ出口飽和水蒸気分圧
以下となるので、アフタクーラ１１内で吸気ガスが露点
以下に冷却されることがないから結露が発生しない。こ
れにより、ＥＧＲガス中のＳＯ3 、ＳＯ4 が吸気ガス中
に混入してもそのＳＯ3 、ＳＯ4 がエンジン本体内部を
腐食させる腐食液となることがなく、エンジン本体内部
を腐食することを防止できる。[Operation] Since the sum of the partial pressure of water vapor in the atmosphere and the saturated water vapor partial pressure at the outlet of the EGR cooler is less than or equal to the saturated water vapor partial pressure at the aftercooler outlet, the intake gas is not cooled below the dew point in the aftercooler 11. Condensation does not occur. Thus, SO 3 in the EGR gas, SO 4 its SO 3 be mixed in the intake gas, SO 4 is without the etchant corrode internal engine body, to corrode the inside of the engine body It can be prevented.
【０００８】[0008]
【実 施 例】図１に示すように、エンジン本体１の燃
焼室２は吸気バルブ３により吸気ポート４に開閉される
と共に、排気バルブ５で排気ポート６に開閉され、その
吸気ポート４は吸気系７に接続し、排気ポート６は排気
系８に接続している。[Example] As shown in FIG. 1, the combustion chamber 2 of the engine body 1 is opened and closed by an intake valve 3 to an intake port 4 and is also opened and closed by an exhaust valve 5 to an exhaust port 6, which intake port 4 is The exhaust port 6 is connected to the system 7, and the exhaust port 6 is connected to the exhaust system 8.
【０００９】前記吸気系７は、吸気フィルタ９、過給機
１０のコンプレッサ１０ａ、アフタクーラ１１を有し、
排気系８には前記過給機１０の排気タービン１０ｂ、排
気マフラ１２を有し、排気系８の排気タービン１０ｂ入
口側と排気系７のコンプレッサ１０ａ入口側とがＥＧＲ
通路１３で短絡されて排気ガスの一部を吸気系７に還流
するようにしてあり、このＥＧＲ通路１３にはＥＧＲ率
調量用バルブ１４、ＥＧＲフィルタ１５、ＥＧＲ冷却器
１６が設けてある。The intake system 7 has an intake filter 9, a compressor 10a of the supercharger 10, and an aftercooler 11,
The exhaust system 8 has the exhaust turbine 10b of the supercharger 10 and the exhaust muffler 12, and the exhaust turbine 8b inlet side of the exhaust system 8 and the compressor 10a inlet side of the exhaust system 7 are EGR.
The passage 13 is short-circuited so that a part of the exhaust gas is recirculated to the intake system 7. The EGR passage 13 is provided with an EGR rate adjustment valve 14, an EGR filter 15, and an EGR cooler 16.
【００１０】前記アフタクーラ１１は冷却水により過給
機１０からの過給空気を冷却するものであり、その冷却
水の供給量を開度調整用バルブ１７により制御すること
でアフタクーラ１１の冷却能力を調整できるようにして
ある。The aftercooler 11 cools the supercharged air from the supercharger 10 with cooling water, and the cooling capacity of the aftercooler 11 is controlled by controlling the supply amount of the cooling water with an opening adjustment valve 17. It can be adjusted.
【００１１】前記ＥＧＲ冷却器１６は冷却水によりＥＧ
Ｒガスを冷却するものであり、その冷却水の供給量を開
度調整用バルブ１８により制御することでＥＧＲ冷却器
１６の冷却能力を調整できるようにしてある。The EGR cooler 16 uses EG to cool the EG.
The R gas is cooled, and the cooling capacity of the EGR cooler 16 can be adjusted by controlling the supply amount of the cooling water by the opening adjustment valve 18.
【００１２】前記アフタクーラ１１の出口側にはアフタ
クーラ出口温度検出器１９が設けられ、ＥＧＲ冷却器１
６の出口側にはＥＧＲ冷却器出口温度検出器２０が設け
てある。An aftercooler outlet temperature detector 19 is provided on the outlet side of the aftercooler 11, and the EGR cooler 1
An EGR cooler outlet temperature detector 20 is provided on the outlet side of 6.
【００１３】図２は制御回路図を示し、前記アフタクー
ラ出口温度検出器１９により検出したアフタクーラ出口
温度ｔAC、前記ＥＧＲ冷却器出口温度検出器２０により
検出したＥＧＲ冷却器出口温度ｔ1 、大気温度検出器２
１により検出した大気温度ｔ0 、大気湿度検出器２２に
より検出した大気湿度ｄ0 はコントローラ２３にそれぞ
れ入力される。FIG. 2 is a control circuit diagram showing the aftercooler outlet temperature t AC detected by the aftercooler outlet temperature detector 19, the EGR cooler outlet temperature t 1 detected by the EGR cooler outlet temperature detector 20, and the atmospheric temperature. Detector 2
The atmospheric temperature t 0 detected by 1 and the atmospheric humidity d 0 detected by the atmospheric humidity detector 22 are input to the controller 23, respectively.
【００１４】エンジン回転速度とエンジンに作用する負
荷により必要なアフタクーラ出口温度ＴACが設定器２４
にあらかじめ設定され、エンジン回転速度検出器２５よ
りのエンジン回転速度と負荷検出手段２６よりの負荷に
よって必要なアフタクーラ出口温度ＴACを算出してコン
トローラ２３に入力する。The aftercooler outlet temperature T AC required by the engine speed and the load acting on the engine is set by the setter 24.
Is set in advance, and the required aftercooler outlet temperature T AC is calculated and input to the controller 23 according to the engine rotation speed from the engine rotation speed detector 25 and the load from the load detection means 26.
【００１５】つまり、エンジン回転速度と負荷によって
最適なる吸気温度がエンジン本体１の性能によって決定
されるので、エンジン回転速度と負荷を検出して必要と
するアフタクーラ出口温度ＴACを算出するようにしてあ
る。That is, since the optimum intake air temperature is determined by the performance of the engine body 1 depending on the engine rotation speed and the load, the required aftercooler outlet temperature T AC is calculated by detecting the engine rotation speed and the load. is there.
【００１６】前記エンジンに作用する負荷が大きくなれ
ば燃料噴射ポンプの燃料噴射量が多くなり、小さくなれ
ば少なくなるので、燃料噴射ポンプの燃料噴射量をコン
トロールするコントロールラックの位置をストロークセ
ンサ等で検出して負荷とし、図３に示すメモリマップに
基づいてコントロールラック位置とエンジン回転速度に
より必要なアフタクーラ出口温度ＴACを算出する。The larger the load acting on the engine, the larger the fuel injection amount of the fuel injection pump, and the smaller the load, the smaller the fuel injection amount. Therefore, the position of the control rack for controlling the fuel injection amount of the fuel injection pump is set by a stroke sensor or the like. The detected temperature is used as a load, and the required aftercooler outlet temperature T AC is calculated based on the control rack position and the engine speed based on the memory map shown in FIG.
【００１７】前記コントローラ２３は各入力値に基づい
て開度調整用バルブ１７，１８の開度を調整する信号を
出力する。The controller 23 outputs a signal for adjusting the opening of the opening adjusting valves 17, 18 based on each input value.
【００１８】次に作動を説明する。エンジン回転速度と
コントロールラック位置に基づいて必要なアフタクーラ
出口温度ＴACを算出し、その温度ＴACとアフタクーラ出
口温度検出器１９で検出したアフタクーラ出口温度ｔAC
をコントローラ２３で比較し、その比較結果により開度
調整用バルブ１７の開度を制御してアフタクーラ１１の
供給冷却水量を増減してアフタクーラ出口温度ｔACを必
要なアフタクーラ出口温度ＴACとする。Next, the operation will be described. The required aftercooler outlet temperature T AC is calculated based on the engine rotation speed and the control rack position, and the temperature T AC and the aftercooler outlet temperature t AC detected by the aftercooler outlet temperature detector 19 are calculated.
Are compared by the controller 23, and the opening degree of the opening adjustment valve 17 is controlled according to the comparison result to increase or decrease the amount of cooling water supplied to the aftercooler 11 to make the aftercooler outlet temperature t AC the required aftercooler outlet temperature T AC .
【００１９】前述の必要なアフタクーラ出口温度ＴACに
よりアフタクーラ出口の飽和水蒸気分圧ＨACをコントロ
ーラ２３で演算する。The saturated steam partial pressure H AC at the aftercooler outlet is calculated by the controller 23 based on the required aftercooler outlet temperature T AC described above.
【００２０】大気温度検出器２１で検出した大気温度ｔ
0 、大気湿度検出器２２で検出した大気湿度ｄ0 より吸
気系７の吸気フィルタ９に最も近い大気中の水蒸気分圧
Ｈ0をコントローラ２３で演算する。Atmospheric temperature t detected by the atmospheric temperature detector 21
0 , the controller 23 calculates the water vapor partial pressure H 0 in the atmosphere closest to the intake filter 9 of the intake system 7 based on the atmospheric humidity d 0 detected by the atmospheric humidity detector 22.
【００２１】前述のようにして演算したアフタクーラ出
口水蒸気分圧ＨACと大気中の水蒸気分圧Ｈ0 に基づいて
ＥＧＲ冷却器出口飽和水蒸気分圧Ｈ1 をコントローラ２
３で演算するBased on the aftercooler outlet water vapor partial pressure H AC and the atmospheric water vapor partial pressure H 0 calculated as described above, the controller 2 determines the EGR cooler outlet saturated water vapor partial pressure H 1.
Calculate with 3
【００２２】ここで、ＥＧＲ冷却器出口飽和水蒸気分圧
Ｈ1 ＋大気中の水蒸気分圧Ｈ0 ＝アフタクーラ出口飽和
水蒸気分圧ＨACとなるようにＥＧＲ冷却器出口飽和水蒸
気分圧Ｈ1 を演算する。The EGR cooler outlet saturated steam partial pressure H 1 is calculated so that the EGR cooler outlet saturated steam partial pressure H 1 + the atmospheric steam partial pressure H 0 = the aftercooler outlet saturated steam partial pressure H AC. To do.
【００２３】前述のようにして演算した必要温度Ｔ1 と
ＥＧＲ冷却器出口温度検出器１８で検出したＥＧＲ冷却
器出口温度ｔ1 を比較し、その比較結果によって開度調
整用バルブ１８の開度を制御してＥＧＲ冷却器１６の供
給冷却水量をコントロールしてＥＧＲ冷却器出口温度ｔ
1 を必要温度Ｔ1 以下とする。The required temperature T 1 calculated as described above is compared with the EGR cooler outlet temperature t 1 detected by the EGR cooler outlet temperature detector 18, and the opening degree of the opening adjusting valve 18 is determined by the comparison result. To control the amount of cooling water supplied to the EGR cooler 16 to control the EGR cooler outlet temperature t.
1 is set to the required temperature T 1 or lower.
【００２４】以上のようにすることで、吸気ガスがアフ
タクーラ１１内で露点以下に冷却されることがないか
ら、アフラクーラ１１内で結露が生じることがない。By doing so, the intake gas is not cooled below the dew point in the aftercooler 11, so that no condensation occurs in the aftercooler 11.
【００２５】[0025]
【発明の効果】大気中の水蒸気分圧とＥＧＲ冷却器出口
飽和水蒸気分圧の和が、アフタクーラ出口飽和水蒸気分
圧以下となるので、アフタクーラ１１内で吸気ガスが露
点以下に冷却されることがないから結露が発生しない。
これにより、ＥＧＲガス中のＳＯ3 、ＳＯ4 が吸気ガス
中に混入してもそのＳＯ3 、ＳＯ4 がエンジン本体内部
を腐食させる腐食液（酸性水溶液）となることがなく、
エンジン本体内部を腐食することを防止できる。Since the sum of the partial pressure of water vapor in the atmosphere and the partial pressure of saturated steam at the outlet of the EGR cooler becomes equal to or lower than the saturated steam partial pressure at the outlet of the aftercooler, the intake gas in the aftercooler 11 may be cooled below the dew point. Condensation does not occur because it does not exist.
Thus, SO 3 in the EGR gas, SO 4 is without also contaminating its SO 3, SO 4 the etchant corrode internal engine body (acidic aqueous solution) during the intake gas,
It is possible to prevent corrosion inside the engine body.
【図１】本発明の実施例を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of the present invention.
【図２】制御回路図である。FIG. 2 is a control circuit diagram.
【図３】エンジン回転速度とコントロールラック位置と
必要なアフタクーラ出口温度の関係を示す図表である。FIG. 3 is a table showing the relationship between engine rotation speed, control rack position, and required aftercooler outlet temperature.
１…エンジン本体 ２…燃焼室 ７…吸気系 ８…排気系 １１…アフタクーラ １３…ＥＧＲ通路 １６…ＥＧＲ冷却器 １７…開度調整用バルブ １８…開度調整用バルブ １９…アフタクーラ出口温度検出器 ２０…ＥＧＲ冷却器出口温度検出器。 DESCRIPTION OF SYMBOLS 1 ... Engine body 2 ... Combustion chamber 7 ... Intake system 8 ... Exhaust system 11 ... Aftercooler 13 ... EGR passage 16 ... EGR cooler 17 ... Opening adjustment valve 18 ... Opening adjustment valve 19 ... Aftercooler outlet temperature detector 20 ... EGR cooler outlet temperature detector.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０２Ｂ 29/04 Ｓ Ｆ０２Ｄ 45/00 ３６０ Ｃ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location F02B 29/04 S F02D 45/00 360 C
Claims (2)
タクーラ１１を有する吸気系７におけるアフタクーラ１
１入口側と、エンジン本体１の燃焼室２に接続した排気
系８をＥＧＲ通路１３で連通し、そのＥＧＲ通路１３に
ＥＧＲ冷却器１６を設けたエンジンの排気ガス還流装置
において、 前記アフタクーラ１１の冷却能力を調整してそのアフタ
クーラ出口温度を、エンジン回転速度と負荷により決定
された必要なアフタクーラ出口温度とし、その必要なア
フタクーラ出口温度の飽和水蒸気分圧と大気中の水蒸気
分圧によりＥＧＲ出口飽和水蒸気分圧を演算し、前記Ｅ
ＧＲ冷却器１６の冷却能力を制御してそのＥＧＲ出口温
度を前記演算したＥＧＲ出口飽和水蒸気分圧に見合う必
要温度以下とすることを特徴とするエンジンの排気ガス
還流装置の制御方法。1. An aftercooler 1 in an intake system 7 connected to a combustion chamber 2 of an engine body 1 and having an aftercooler 11.
In the exhaust gas recirculation device for an engine, the exhaust system 8 connected to the combustion chamber 2 of the engine body 1 is connected to the inlet 1 side by an EGR passage 13, and an EGR cooler 16 is provided in the EGR passage 13. Adjust the cooling capacity to make the aftercooler outlet temperature the required aftercooler outlet temperature determined by the engine speed and load, and saturate the EGR outlet with the required aftercooler outlet temperature saturated steam partial pressure and atmospheric water vapor partial pressure. Calculate the partial pressure of water vapor and
A method for controlling an exhaust gas recirculation device for an engine, characterized in that the cooling capacity of the GR cooler 16 is controlled so that the EGR outlet temperature is equal to or lower than a necessary temperature commensurate with the calculated EGR outlet saturated steam partial pressure.
タクーラ１１を有する吸気系７におけるアフタクーラ１
１入口側と、エンジン本体１の燃焼室２に接続した排気
系８をＥＧＲ通路１３で連通し、そのＥＧＲ通路１３に
ＥＧＲ冷却器１６を設けたエンジンの排気ガス還流装置
において、 前記アフタクーラ１１の冷却能力を制御する第１の手段
と、前記ＥＧＲ冷却器１６の冷却能力を制御する第２の
手段と、エンジン回転速度と負荷により必要なアフタク
ーラ出口温度を算出する第３の手段と、アフタクーラ１
１の出口温度を必要なアフタクーラ出口温度とすべく第
１の手段をコントロールする第４の手段と、大気中の水
蒸気分圧と前記演算した必要なアフタクーラ出口温度に
よる飽和水蒸気分圧によりＥＧＲ冷却器出口飽和水蒸気
分圧を演算する第５の手段と、ＥＧＲ冷却器出口温度を
前記ＥＧＲ冷却器出口飽和水蒸気分圧に見合う必要温度
とすべき前記第２の手段をコントロールする第６の手段
より構成したエンジンの排気ガス還流装置の制御装置。2. An aftercooler 1 in an intake system 7 connected to a combustion chamber 2 of an engine body 1 and having an aftercooler 11.
In the exhaust gas recirculation device for an engine, the exhaust system 8 connected to the combustion chamber 2 of the engine body 1 is connected to the inlet 1 side by an EGR passage 13, and an EGR cooler 16 is provided in the EGR passage 13. A first means for controlling the cooling capacity, a second means for controlling the cooling capacity of the EGR cooler 16, a third means for calculating a necessary aftercooler outlet temperature according to an engine speed and a load, and an aftercooler 1.
The fourth means for controlling the first means to bring the outlet temperature of 1 to the required aftercooler outlet temperature, and the saturated water vapor partial pressure according to the above-calculated required aftercooler outlet temperature in the atmosphere and the EGR cooler It is composed of a fifth means for calculating the outlet saturated water vapor partial pressure and a sixth means for controlling the second means for making the EGR cooler outlet temperature a necessary temperature commensurate with the EGR cooler outlet saturated water vapor partial pressure. Control device for exhaust gas recirculation system of engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27900294A JP3393630B2 (en) | 1994-11-14 | 1994-11-14 | Control method and control device for engine exhaust gas recirculation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27900294A JP3393630B2 (en) | 1994-11-14 | 1994-11-14 | Control method and control device for engine exhaust gas recirculation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08135519A true JPH08135519A (en) | 1996-05-28 |
| JP3393630B2 JP3393630B2 (en) | 2003-04-07 |
Family
ID=17605038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27900294A Expired - Fee Related JP3393630B2 (en) | 1994-11-14 | 1994-11-14 | Control method and control device for engine exhaust gas recirculation device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3393630B2 (en) |
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