Improvement of Fuel Consumption for Heavy-duty Trucks by a Dual-loop EGR System
•デュアルループEGRシステムによる商用車用大型エンジンの燃費改善
- Delivery
- Available on the other site
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- Paper/Info type
- HINO TECHNICAL REVIEW
No.71
- Pages
- 63-68(Total 6 p)
- Date of publication
- Jan 2022
- Publisher
- Others, Unknown
- Language
- Japanese
Detailed Information
| Category(J) | 論文 Translation |
|---|---|
| Category(E) | Technical Papers and Explanation |
| Author(J) | 1) 石井 森, 2) 福長 聡, 3) 中島 大, 4) 下川清広 |
| Author(E) | 1) Mori Ishii, 2) Akira Fukunaga, 3) Hiroshi Nakajima, 4) Kiyohiro Shimokawa |
| Affiliation(J) | 1) 日野, 2) 日野, 3) 日野, 4) 日野 |
| Affiliation(E) | 1) Hino, 2) Hino, 3) Hino, 4) Hino |
| Abstract(J) | 大型トラックの燃費低減方策として、高圧EGRと低圧EGR の2系統EGRをもってDual Loop EGRを検討した。また低圧EGR で発生する凝縮水の生成メカニズム解析と成分分析を実施し、その影響と抑制策を考察した。その結果、Dual Loop EGRシステムにより排気圧力と吸気圧力の差がない状態でもポンピングロスを増やさずにEGR量を確保できるとともに、低回転運転域では過給機通過ガス量を増やすことで過給機を高効率領域で作動させることができ、排出ガス低減と燃費改善の両立ができた。また、凝縮水の発生は酸露点温度ではなく水露点温度と一致することを示し、ガス温度を水露点以上に制御することで凝縮水も抑制することができた。 Translation |
| Abstract(E) | A dual-loop EGR system which consists of a high-pressure EGR loop and a low-pressure EGR loop was examined for improving fuel consumption of heavy-duty trucks. Having clarified the mechanism of dew condensation in the intercooler that occurred in using the low-pressure loop, the authors proposed measures to suppress this dew condensation. With this new dual-loop EGR system that recirculates sufficient amount of exhaust gas without increasing pumping loss even under low engine ⊿P conditions, both emission reduction and fuel consumption improvement were accomplished by shifting the lug line of turbocharger to the high-efficiency region at low speed engine operation. It was also experimentally clarified that the condensation started at water dew point, not at acidic dew point. It implies that controlling the gas temperature above the water dew point could suppress dew condensation. |
