Direct indignation diesel engine

Abstract

Abstract Translated from Japanese (57)【要約】 【課題】ＨＣの排出量が増加する運転域では、パイロッ ト噴射の噴射時期を遅角させて拡散燃焼させ、未燃ＨＣ を抑制し、ＨＣの少ない運転域ではパイロット噴射によ る燃焼を予混合燃焼として、スモーク排出量を低減す る。 【解決手段】 直憤式ディーゼルエンジンにおいて、運 転状態から未燃ＨＣの排出量が多い領域と少ない領域と を判定し、未燃ＨＣの排出量が多い領域ではパイロット 噴射の噴射時期を遅角させ、同じく未燃ＨＣの少ない領 域ではパイロット噴射時期を進角させる。これにより未 燃ＨＣの排出量の多い領域では拡散燃焼によりＨＣを減 らし、同じく排出量の少ない領域では予混合燃焼により スモークを低減する。 (57) [Summary] In an operating range in which the amount of HC emission increases, the injection timing of pilot injection is retarded to cause diffusion combustion, and unburned HC In the operating range where the amount of HC is small, combustion by pilot injection is regarded as premixed combustion to reduce smoke emission. SOLUTION: In a direct resentment diesel engine, a region where a large amount of unburned HC is discharged and a region where a small amount of unburned HC are discharged are determined from an operating state, and in a region where a large amount of unburned HC is discharged, the injection timing of pilot injection is retarded. In a region where the amount of unburned HC is small, the pilot injection timing is advanced. As a result, HC is reduced by diffusion combustion in a region where the amount of unburned HC is large, and smoke is reduced by premixed combustion in a region where the amount of unburned HC is small.

Inventors

• 👤 Hiroshi Ogawa
• 👤 弘志 小川
• 👤 Shuji Kimura
• 👤 修二 木村

Bibliographic Details