COMPRESSION IGNITION TYPE ENGINE WITH SUPERCHARGER

To provide a compression ignition type engine with a supercharger for performing supercharging and SPCCI combustion at the time of a high load while suppressing an increase in combustion noise and an increase in the Raw NOx generation amount and suppressing a reduction in the output torque and the worsening of fuel economy at the time of the high load.SOLUTION: The compression ignition type engine with the supercharger includes liquid temperature control means (a flow control valve 63) for controlling the temperature of engine cooling liquid to be supplied from an engine body 10 to a radiator 62, and control means. When the operating condition of the engine body 10 is in a high load operation region, the control means reduces the target temperature of the engine cooling liquid to be controlled by the liquid temperature control means further than when the operating condition of the engine body 10 is in a low load operation region.SELECTED DRAWING: Figure 2 【課題】高負荷時に過給を行いかつＳＰＣＣＩ燃焼を行う過給機付圧縮着火式エンジンにおいて、高負荷時に、燃焼騒音の増大及びＲａｗＮＯｘ発生量の増大を抑制するとともに、出力トルクの低下及び燃費の悪化を抑制する。【解決手段】エンジン本体１０からラジエータ６２に供給されるエンジン冷却液の温度を調整する液温調整手段（流量コントロール弁６３）と、制御手段とを備え、該制御手段は、エンジン本体１０の運転状態が高負荷運転領域にあるときには、エンジン本体１０の運転状態が低負荷運転領域にあるときに比べて、液温調整手段による調整されるエンジン冷却液の目標温度を低くするように構成されている。【選択図】図２