INTERNAL COMBUSTION ENGINE HAVING VARIABLE TURBO CHARGER

摘要

PROBLEM TO BE SOLVED: To obtain sufficiently acceleration performance by promptly starting up turbo charger pressure at the time of accelerating from a low load state. SOLUTION: While idle stopping, if a shift position is switched in a D range (step S4, step S14), an opening of a variable member of a turbo charger is changed to a close side to raise turbo charger pressure (step S20). In order to switch an air-fuel ratio to a second lean air-fuel ratio on a lean side (step S22), after suppressing an increase of an engine torque accompanied with the rising of turbocharger pressure, it becomes possible to raise turbo charger pressure in the low load state beforehand.