COMPRESSION IGNITION-TYPE ENGINE WITH SUPERCHARGER
To surely perform compression ignition even if a target cooling water temperature is set low compared with a low-rotation area, in a high-rotation area out of a prescribed low-load area.SOLUTION: An intake passage 10 of an engine 1 has a main intake passage 11 in which a supercharger 30 is arranged,...
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Zusammenfassung: | To surely perform compression ignition even if a target cooling water temperature is set low compared with a low-rotation area, in a high-rotation area out of a prescribed low-load area.SOLUTION: An intake passage 10 of an engine 1 has a main intake passage 11 in which a supercharger 30 is arranged, and a bypass passage 12 which bypasses the supercharger 30, and in which a control valve 32 is arranged. A combustion mode in regions A1, A2 being prescribed low-load regions is set as a compression ignition combustion mode. A target cooling water temperature of the engine 1 is set low compared with the region A1 in the region A2 in which an engine rotation number is high. In the region A2 in which a cooling water temperature of the engine 1 is set low, the supercharger 30 is driven, the control valve 32 is valve-opened, and intake air supercharged by the supercharger 30 is circulated to the supercharger 30 once again via the bypass passage 12, thus raising a temperature of the intake air supplied to the engine 1.SELECTED DRAWING: Figure 2
【課題】所定低負荷域のうち高回転域において、低回転域に比して目標冷却水温度が低く設定された場合でも、圧縮着火を確実に行えるようにする。【解決手段】エンジン1の吸気通路10が、過給機30が配設された主吸気通路11と、過給機30をバイパスすると共に制御弁32が配設されたバイパス通路12とを有する。所定低負荷域となる領域A1、A2での燃焼モードが、圧縮着火の燃焼モードとされる。エンジン1の目標冷却水温度が、エンジン回転数の高い領域A2では、領域A1に比して低くされる。エンジン1の冷却水温度が低くされる領域A2では、過給機30が駆動されると共に制御弁32が開弁されて、過給機30で過給された吸気がバイパス通路12を介して再び過給機30に循環されることにより、エンジン1に供給される吸気温度が上昇される。【選択図】 図2 |
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