| 摘要 |
PROBLEM TO BE SOLVED: To operate an internal combustion engine so that a combustion state without output fluctuation and with stability is maintained in a cold condition, in a control system for an internal combustion engine comprising a variable valve system capable of varying operation timing of an intake valve. SOLUTION: The variable valve system is provided to vary valve closing timing of the intake valve. In a cold operation of the internal combustion engine (Step 100), if a misfire is detected (Step 110), a target compression ratio tεis increased (Step 112), or if knocking is detected, the target compression ratio tεis decreased (Step 114). Target valve closing timing tIVC of the intake valve for realizing the target compression ratio tεis computed (Step 116). A maximum lift IVLMax and valve opening timing IVO of the intake valve are decided so as to bring an intake air quantity GN at a desired value while realizing the target valve closing timing tIVC (Step 120).
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