| 摘要 |
PROBLEM TO BE SOLVED: To improve drivability in an internal combustion engine by restraining the occurrence of a torque level difference in air fuel ratio change and by reducing control time. SOLUTION: A turbosupercharger 45 compressing and supplying intake air to a combustion chamber 18 is provided, and a combustion mode can be switched from a non-supercharged stoichiometric combustion mode to a supercharged lean combustion mode by an ECU 55 in accordance with an engine operation state. The ECU 55 retards ignition timing when the combustion mode is switched from the non-supercharged stoichiometric combustion mode to the supercharged lean combustion mode, and sets a delay quantity of the ignition timing so that an actual supercharging pressure approaches a target supercharging pressure after switching the combustion mode, and the ignition timing is advanced, and the actual supercharging pressure is set to be the target supercharging pressure in switching of the combustion mode. COPYRIGHT: (C)2008,JPO&INPIT
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