Method for controlling a supercharged engine, particularly an indirect injection engine, and engine using such a method

A method for controlling a supercharged engine, in particular an indirect injection engine, the supercharged engine comprising at least a controller and sensors, one cylinder having a combustion chamber, at least one supercharged fuel-containing air intake means with a supercharged fuel-containing inlet valve, a supercharged non-fuel-containing air intake means with a supercharged non-fuel-containing air inlet valve, and at least one burned gas exhaust means with an exhaust valve, the method comprising:

• determining an overlap of the valves by opening the supercharged non-fuel-containing air inlet valve and closing the exhaust valve before the exhaust phase of an engine cylinder and in the vicinity of the top dead center (TDC);
• actuating a blocking means for blocking the supercharged non-fuel-containing air intake means to admit supercharged air flowing in the supercharged non-fuel-containing air intake means into the chamber to scavenge residual burned gases when a pressure of the supercharged non-fuel-containing air is greater than a pressure of the exhaust gases;
• and
• actuating the blocking means to shut off the supercharged air flowing from the supercharged non-fuel-containing intake means into the chamber when pressure of the supercharged non-fuel-containing air is less than pressure of the exhaust gases.