| abstract |
Provided is a method for calculating an oxygen concentration in a combustion chamber, including: calculating volume efficiency of the combustion chamber while a variable valve lift is in an on state and the volume efficiency of the combustion chamber and the volume of internal EGR from the volume of the combustion chamber while the variable valve lift is in an off state; and calculating a mass of the internal EGR from the pressure of an exhaust manifold, the temperature of the exhaust manifold, and the volume of the internal EGR. |