CONTROL DEVICE OF HOMOGENEOUS CHARGE COMPRESSION IGNITION TYPE ENGINE

PROBLEM TO BE SOLVED: To provide a control device of a compression ignition type engine which is favorably maintained in exhaust performance, suppressed in a cooling loss, and can obtain homogeneous charge compression ignition combustion in a wide engine load area.SOLUTION: In a first region A1_a in which an engine load becomes not smaller than a second reference load T2, fuel is injected into a combustion chamber 10 in a latter half of a compression stroke so that a fuel concentration immediately before a start of combustion in a center portion of the combustion chamber 10 becomes higher than that in an external peripheral portion, and water is injected into the combustion chamber 10 in a latter half of the compression stroke by a water injection valve 57, and on the other hand, in a second region A1_b in which the engine load is smaller than the second reference load T2, the fuel is injected into the combustion chamber 10 in a latter half of the compression stroke so that the fuel concentration immediately before a start of the combustion in the center portion of the combustion chamber 10 becomes higher than that in the external peripheral portion, and on the other hand, the injection of the water by the water injection valve 57 is stopped.SELECTED DRAWING: Figure 14 【課題】排気性能が良好に維持され且つ冷却損失が少なく抑えられた予混合圧縮着火燃焼を幅広いエンジン負荷域で実現可能な圧縮着火式エンジンの制御装置を提供する。【解決手段】エンジン負荷が第２基準負荷Ｔ２以上となる第１領域Ａ１＿ａでは、燃焼室１０の中央部分の方が外周部分よりも燃焼開始直前の燃料濃度が高くなるように圧縮行程後半に燃焼室１０内に燃料を噴射するとともに水噴射弁５７によって圧縮行程後半に燃焼室１０内に水を噴射させる一方、エンジン負荷が第２基準負荷Ｔ２未満の第２領域Ａ１＿ｂでは、燃焼室１０の中央部分の方が外周部分よりも燃焼開始直前の燃料濃度が高くなるように圧縮行程後半に燃焼室１０内に燃料を噴射する一方水噴射弁５７による水の噴射を停止する。【選択図】図１４