Abstract: A method for determining an air mass air in a cylinder of an internal combustion engine is disclosed. A first filling equivalent is determined during a compression phase of the cylinder, wherein the first filling equivalent corresponds to a first average pressure difference in a first angle range of a crank angle in the compression phase. A second filling equivalent is determined during an expansion phase of the cylinder, wherein the second filling equivalent corresponds to a second average pressure difference in a second angle range of the crank angle of the expansion phase. A differential filling equivalent is calculated by subtracting the first filling equivalent from the second filling equivalent. The air mass in the cylinder is determined based on the differential filling equivalent.

Abstract: A method for determining an air mass air in a cylinder of an internal combustion engine is disclosed. A first filling equivalent is determined during a compression phase of the cylinder, wherein the first filling equivalent corresponds to a first average pressure difference in a first angle range of a crank angle in the compression phase. A second filling equivalent is determined during an expansion phase of the cylinder, wherein the second filling equivalent corresponds to a second average pressure difference in a second angle range of the crank angle of the expansion phase. A differential filling equivalent is calculated by subtracting the first filling equivalent from the second filling equivalent. The air mass in the cylinder is determined based on the differential filling equivalent.