| 摘要 |
The invention relates to a method for determining a total cylinder charge (rfrges) in cylinders of an internal combustion engine (2) having exhaust gas recirculation, wherein exhaust gas is recirculated at an introduction point (10) into an intake pipe (4) in order to feed a gas mixture into the cylinders (3), wherein the total cylinder charge (rfrges) indicates an instantaneous, total gas amount in the cylinders (3), wherein the total cylinder charge (rfrges) is ascertained according to a sum of the gas mass flows fed to the intake pipe (4) and according to a first dynamic correction factor (fvisrm) which describes the dynamic behavior of the intake pipe (4) regarding the intake pipe pressure which develops there. Furthermore, an instantaneous residual gas rate (rragrzw) which indicates the instantaneous proportion of exhaust gas in the total gas present in the intake pipe (4) can be determined according to an exhaust gas partial pressure (psrext) and according to the instantaneous intake pipe pressure (ps), wherein the exhaust gas partial pressure is determined according to an exhaust gas mass flow fed to the intake pipe, according to a second dynamic correction factor which describes the dynamic behavior of the intake pipe (4) taking into consideration the introduction point (10) regarding the exhaust gas partial pressure (psrext) developing, and according to an instantaneous exhaust gas cylinder charge. Furthermore, the instantaneous air charge (rlfgsb) can be determined according to the total cylinder charge (rfrges) and the provided residual gas rate (rragrzw). |
