JP5839633B2 - 排気ガス後処理システムを運転温度範囲内に保つための方法及び内燃エンジンシステム - Google Patents
排気ガス後処理システムを運転温度範囲内に保つための方法及び内燃エンジンシステム Download PDFInfo
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Description
i.排気ガス後処理システムに流れ込む排気ガスの総量を減らし、それによって排気ガス後処理システムへの「冷却用」排気ガスの流入を減らす機能、及び
ii.圧力制御弁を少なくとも部分的に閉じることによって弁の上流で発生する圧力上昇が、排気ガスの再循環を促進し、好ましくは燃焼エンジンのガス吸入側へと再循環されるべき排気ガスの量を決定する機能。
i.未冷却の排気ガスの再循環によって、エンジンの動作温度、ひいては排気ガスの全温度が上昇し、それによってエンジンのアイドリング又はモータリングエンジン運転モード中の排気ガス後処理システムの−望ましくない−空気冷却効果が軽減される。
ii.排気ガスダクト内に配置された圧力制御弁を少なくとも部分的に閉じることにっよって、エンジンのアイドリング又はモータリングエンジン運転モード中に後処理システムを流れる排気ガスの量が減少し、エンジンに再循環される排気ガスの量を制御することができ、ひいては、エンジンのアイドリング又はモータリングエンジン運転モード中の後処理システムの−望ましくない−空気冷却効果も軽減される。
http://ec.europa.eu/enterprise/sectors/automotive/files/projects/report_whdc_en.pdf.
1 内燃エンジン
2 エンジンブロック
4 ピストンシリンダ
5 エンジンブロック2のガス吸入側
6 吸気マニホルド
7 エンジンブロック2の排気ガス出口側
8 排気マニホルド
10 タービン
12 排気ガスダクト
14 排気ガス後処理システム
16 圧縮機
17 給気冷却器
18 吸気ダクト
20 接続ダクト
22 ガス再循環弁
24 圧力制御弁
26 温度センサ
30 本発明の方法を用いた場合の温度対時間を示すグラフ
32 本発明の方法を用いない場合の温度対時間を示すグラフ
Claims (16)
- 内燃エンジンのアイドリング又はモータリングエンジン運転モード中に排気ガス後処理システム(14)を運転温度範囲内に保つための方法であって、前記内燃エンジン(1)は、前記排気ガス後処理システム(14)に接続され、ガス吸入側(5)及び排気ガス出口側(7)を備えており、前記内燃エンジン(1)の前記排気ガス出口側(7)は、排気ガスダクト(12)を介して前記排気ガス後処理システム(14)と、前記内燃エンジン(1)の前記ガス吸入側(5)への排気ガスのガス再循環を提供する接続ダクト(20)及び記排気ガスの再循環を制御する少なくとも1つの弁(22,24)を介して前記ガス吸入側(5)とに接続される方法において、
前記内燃エンジン(1)の前記ガス吸入側(5)のガス及び/又は排気ガスの温度を検知するステップと、
検知された温度が所定の温度範囲内であるかどうかを決定するステップと、
前記内燃エンジン(1)がアイドリング又はモータリングエンジン運転モードであるかどうかを決定するステップと、を備え
前記内燃エンジン(1)がアイドリング又はモータリングエンジン運転モードであると決定された場合のみ、前記少なくとも1つの弁(22,24)を制御することにより、排気ガスを前記接続ダクト(20)を通って再循環させることによって、前記内燃エンジン(1)の前記ガス吸入側(5)のガスの温度が前記所定の温度範囲内になるように制御するステップを更に備えることを特徴とする、方法。 - 前記少なくとも1つの弁(22,24)は、前記接続ダクト(20)に配置されたガス再循環弁(22)であり、好ましくは、前記ガス再循環弁(22)は、開閉するように制御される、好ましくは普段は閉じている、開閉弁(22)であり、前記少なくとも1つの弁(22,24)を制御するステップは、前記ガス再循環弁(22)が開くように制御するステップである、請求項1に記載の方法。
- 更に、前記排気ガスダクト(12)が、好ましくは普段は開いている、圧力制御弁(24)を備えており、該圧力制御弁(24)は、排気ガスの少なくとも一部が前記接続ダクト(20)を通って前記内燃エンジン(1)の前記ガス吸入側(5)へ再循環されるように、前記圧力制御弁(24)を少なくとも部分的に閉じるように制御されるステップである、請求項1又は2に記載の方法。
- 前記所定の温度範囲は所定の最高温度を有する、請求項1〜3のいずれかに記載の方法。
- 前記所定の最高温度は、およそ100℃〜150℃、好ましくはおよそ110℃〜130℃、詳細には実質的に120℃である、請求項4に記載の方法。
- 前記再循環される排気ガスは未冷却の排気ガスである、請求項1〜5のいずれかに記載の方法。
- 前記圧力制御弁(24)は、前記排気ガス後処理システム(14)へのガス流量をおよそ20%〜70%、好ましくはおよそ30%〜60%、詳細には実質的に40%〜50%減少させる、請求項3に記載の方法。
- 前記圧力制御弁(24)は、エンジン速度と、前記内燃エンジン(1)の前記ガス吸入側(5)のガス及び/又は排気ガスの検知された温度とに応じて、前記排気ガス後処理システム(14)へのガス流量を減少させる、請求項3に記載の方法。
- 前記ガス再循環弁(22)は、車両のアクセルが解除されるとすぐに作動し、前記ガス再循環弁(22)は、前記アクセルが作動するとすぐに通常開放位置に戻り、前記アクセルは、好ましくはガスペダルである、請求項2に記載の方法。
- 前記検知された温度が前記所定の最高温度よりも高い場合、前記再循環弁(22)が閉じる、請求項2又は4に記載の方法。
- 車両を推進させる内燃エンジンシステム(100)であって、
ガス吸入側(5)及び排気ガス出口側(7)を有する内燃エンジン(1)と、
排気ガスダクト(12)によって前記内燃エンジン(1)の前記排気ガス出口側(7)に接続される排気ガス後処理システム(14)と、
前記内燃エンジン(1)の前記排気ガス出口側(7)と前記内燃エンジン(1)の前記ガス吸入側(5)を接続し、前記内燃エンジン(1)の前記ガス吸入側(5)への排気ガスのガス再循環を提供する接続ダクト(20)と、
前記排気ガスの再循環を制御する少なくとも1つの弁(22,24)とを備えている内燃エンジンシステムにおいて、
前記内燃エンジン(1)がアイドリング又はモータリングエンジン運転モードであるかどうかを決定するための検知ユニットと、
前記内燃エンジン(1)の前記アイドリング又はモータリングエンジン運転モード中に前記排気ガス後処理システム(14)を運転温度範囲内に保つためのシステムであって、
ガス温度を検知するために、前記排気ガスダクト(12)、前記接続ダクト(20)、及び前記排気ガス後処理システム(14)を含む前記内燃エンジン(1)の前記ガス吸入側(5)、前記排気ガス出口側(7)の少なくとも一方に配置された少なくとも1つの温度センサ(26)と、を備え、
前記内燃エンジン(1)が前記アイドリング又はモータリングエンジン運転モードである場合のみ、検知された温度に応じて前記少なくとも1つの弁(22,24)を開放及び/又は閉鎖するように制御し、それによって前記接続ダクト(20)を通って前記内燃エンジン(1)の前記ガス吸入側(5)への排気ガス再循環を提供することで、前記内燃エンジン(1)の前記ガス吸入側(5)のガスの温度が、所定の温度範囲内になるように制御される、少なくとも1つの制御装置とを有するシステムを更に備えていることを特徴とする、システム。 - 請求項1〜10のいずれかに記載の方法を実行するように構成された、請求項11に記載のシステム。
- 少なくとも1つの弁(22,24)は、前記接続ダクト(20)に配置されたガス再循環弁(22)であり、好ましくは、前記ガス再循環弁(22)は、開閉するように制御される、好ましくは普段は閉じている、開閉弁(22)である、請求項11又は12に記載のシステム。
- 好ましくは前記排気ガス後処理システム(14)の上流の、前記排気ガスダクト(12)に配置されて、前記排気ガス後処理システム(14)への排気ガスの量を制御し、且つ/又は前記接続ダクト(20)を通る前記ガス再循環を推進する圧力を供給する、好ましくは普段は開いている、圧力制御弁(24)を更に備えている、請求項11〜13のいずれかに記載のシステム。
- 前記制御装置は、請求項1〜10のいずれかに記載の方法を実行するようにプログラム可能な、車両の中の既存のCPU又はECU、特に車載コンピュータであり、好ましくは前記制御装置と前記検知ユニットが単一ユニットに組み込まれる、請求項11〜14のいずれかに記載のシステム。
- コンピュータ上で実施することが可能であって、前記コンピュータのプロセッサが請求項1〜10のいずれかに記載の方法のステップを実行する命令を含むソフトウェアコードを含む、コンピュータ読み取り可能な記録媒体。
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