Method and apparatus for determining the cylinder charge in the case of unthrottled internal-combustion engines

摘要

A method and apparatus is provided for determining the cylinder charge in the case of unthrottled internal-combustion engines with a variable valve gear. For determining the fresh-air cylinder charge in the case of such internal-combustion engines, the following steps are followed (i) at least one engine operating value is determined, (ii) a standardized air flow rate is determined relative to a defined inlet and outlet spread as a function of the at least one engine operating value, and (iii) the influence of the actual inlet spread existing in comparison to the defined inlet spread on the air flow rate is determined and a corrected air flow rate is calculated.