Patent ID: 7191052

Claim:
A method for determining exhaust-gas recirculation quantity for a combustion engine having exhaust-gas recirculation, comprising: (a) advance determining of a basic quantity of a gas mixture inducted into at least one combustion chamber of the combustion engine and at least one of (a) a basic pressure and (b) a basic temperature of the gas mixture for at least one predefinable basic state of the combustion engine at deactivated exhaust-gas recirculation; (b) ascertaining at least one of (a) a pressure and (b) a temperature of the inducted gas mixture for a particular current engine state at activated exhaust-gas recirculation; (c) determining a currently inducted gas-mixture quantity as the basic quantity, corrected at least by at least one of (a) a ratio of currently ascertained pressure to basic pressure of the gas mixture and (b) a ratio of the basic temperature to currently ascertained temperature of the gas mixture; (d) determining a fresh-gas portion of the inducted gas mixture for the particular current engine state, and (e) determining a current exhaust-gas recirculation quantity in accordance with a difference between the currently inducted gas-mixture quantity determining in the determining step (c) and the current fresh-gas portion determined in the determining step (d).