JP6597737B2 - 車両用エンジンの吸排気装置 - Google Patents
車両用エンジンの吸排気装置 Download PDFInfo
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- JP6597737B2 JP6597737B2 JP2017162454A JP2017162454A JP6597737B2 JP 6597737 B2 JP6597737 B2 JP 6597737B2 JP 2017162454 A JP2017162454 A JP 2017162454A JP 2017162454 A JP2017162454 A JP 2017162454A JP 6597737 B2 JP6597737 B2 JP 6597737B2
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- 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
- F02M26/03—EGR systems specially adapted for supercharged engines with a single mechanically or electrically driven intake charge compressor
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- F02M35/10—Air intakes; Induction systems
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
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- 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
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- F02B33/32—Engines with pumps other than of reciprocating-piston type
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Description
この構成例において、エンジン1は、前方吸気・後方排気式に構成されている。つまり、エンジン1は、図2に示すように、4つのシリンダ11を有するエンジン本体10と、エンジン本体10の前側に配置され、吸気ポート17、18を介して各シリンダ11に連通する吸気通路30と、エンジン本体10の後側に配置され、排気ポート19、19を介して各シリンダ11に連通する排気通路50と、を備えている。なお、図1では1つのシリンダ11のみを示す。
以下、吸気通路30の構成について詳細に説明する。
まず、過給機34に吸入される側の通路構造について詳細に説明する。
次に、バイパス通路40側の通路構造について詳細に説明する。
図10は、EGR通路52を左側から見て示す図であり、図11は、EGR通路52を上側から見て示す図である。また、図12は、EGR通路52の下流端部を後側から見て示す図であり、図13は、EGR通路52の下流端部を示す断面図である。また、図14は、EGR通路52と吸気ポート17、18との相対位置関係を示す図である(この図には、第1ポート17のみを示す)。
エンジン1は、該エンジン1を運転するためのECUを備えている。ECUは、各種のセンサより出力された検知信号に基づいて、エンジン1の運転状態を判断すると共に、種々のアクチュエータの制御量を計算する。そして、ECUは、計算した制御量に対応する制御信号を、インジェクタ6、点火プラグ25、吸気電動S−VT23、排気電動S−VT24、燃料供給システム61、スロットルバルブ32、EGRバルブ54、過給機34の電磁クラッチ34a、バイパスバルブ41、及び流動制御デバイス80等に出力し、エンジン1を運転する。
ところで、エンジン1が運転すると、新気や外部EGRガスのように水分を含んだガスがインタークーラ36によって冷却されたときに、その水分に起因した凝縮水が、インタークーラ36よりも下流側の通路において生成される。
前記実施形態では、FF方式の車両に搭載される横置きのエンジン1について例示したが、この構成には限られない。例えばFR方式の車両に搭載される縦置きのエンジンとしてもよい。
10 エンジン本体
11 シリンダ(気筒)
16 燃焼室
17 第1ポート(吸気ポート、下流側通路)
18 第2ポート(吸気ポート、下流側通路)
30 吸気通路
30A 主吸気通路(第1吸気通路)
34 過給機
36 インタークーラ
37 第3通路(導入通路)
38 サージタンク
38b 導入口
39 独立通路(下流側通路)
40 バイパス通路(第2吸気通路)
40A 中継通路部
40B 上方通路部
41 バイパスバルブ(流量調整弁)
45 曲管部
45a 下壁面(水受構造)
50 排気通路
52 EGR通路
52b 下流側EGR通路
53 EGRクーラ
71 壁部(逆流防止構造)
72 壁部(逆流防止構造)
Claims (5)
- 列状に並んだ複数のシリンダと、該複数のシリンダの各々に設けられた燃焼室と、前記燃焼室に接続された吸気通路及び排気通路と、前記排気通路から分岐して、下流端部が前記吸気通路に接続されたEGR通路と、を備えた車両用エンジンの吸排気装置であって、
前記吸気通路は、前記燃焼室に通じる吸気ポートを含み、且つ過給機が介設された第1吸気通路と、前記第1吸気通路において前記過給機の上流側から分岐するとともに、該過給機を迂回して前記燃焼室に通じるように構成された第2吸気通路と、を有し、
前記第1吸気通路は、前記吸気ポートを含んで構成され、かつ該吸気ポートを介して前記燃焼室に接続された下流側通路と、該下流側通路の上流端部が接続された1つのサージタンクと、を含み、
前記第2吸気通路は、前記第1吸気通路から分岐してエンジン上方に向かって延びる中継通路部と、該中継通路部の上端部から前記サージタンクへ向って延設されて前記過給機を迂回するように構成され、且つ前記第1吸気通路の上方に配置された上方通路部と、を含み、
前記上方通路部は、気筒列方向に間隔を空けて並んだ2股の分岐通路に分岐し、
前記上方通路部はまた、前記各分岐通路の下流端部が前記サージタンクの上部に接続されることで、前記吸気ポートに対して上方に位置し、
前記EGR通路は、前記上方通路部に接続されている
ことを特徴とする車両用エンジンの吸排気装置。 - 請求項1に記載された車両用エンジンの吸排気装置において、
前記上方通路部には、前記第2吸気通路の流路断面積を変更する流量調整弁が設けられ、
前記EGR通路は、前記上方通路部において前記流量調整弁の上流側に接続されている
ことを特徴とする車両用エンジンの吸排気装置。 - 請求項1又は2に記載された車両用エンジンの吸排気装置において、
前記EGR通路には、該EGR通路を通過するガスを冷却するEGRクーラが介設され、
前記EGR通路において前記EGRクーラの下流側部分は、前記上方通路部に向かうにつれて、下方から上方へ向かって延びている
ことを特徴とする車両用エンジンの吸排気装置。 - 請求項1から3のいずれか1項に記載された車両用エンジンの吸排気装置において、
前記上方通路部において前記EGR通路が接続された部分には、前記EGR通路及び前記上方通路部において発生した凝縮水の前記第1吸気通路への流入を抑制するように構成された水受構造が形成されている
ことを特徴とする車両用エンジンの吸排気装置。 - 請求項1から4のいずれか1項に記載された車両用エンジンの吸排気装置において、
前記第1吸気通路における前記サージタンクの上流側にはインタークーラが介設され、
前記第1吸気通路は、車両搭載状態において前記インタークーラが前記サージタンクよりも下方に位置するように構成されていると共に、前記インタークーラと前記サージタンクの底部とを接続する導入通路を有し、
前記導入通路の上流端部から、該導入通路の下流端部及び前記サージタンクの接続部にかけての区間内に、前記インタークーラに向かって流れる凝縮水の水量を低減するように構成された逆流防止構造が形成されている
ことを特徴とする車両用エンジンの吸排気装置。
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US16/103,753 US10774793B2 (en) | 2017-08-25 | 2018-08-14 | Intake and exhaust device for automotive engine |
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