Patent ID: 8108121

Claim:
A system for correcting the fuel concentration in a regeneration gas flow which is conducted from a fuel vapor canister of a tank venting device for an internal combustion engine, comprising: means for determining the fuel concentration in the regeneration gas flow, means for setting a defined regeneration gas flow rate and for supplying the gas flow rate to the internal combustion engine such that the regeneration gas is used in the combustion, means for determining a reference composition of the exhaust gas of the internal combustion engine, means for varying the regeneration gas flow rate by a pre-specified adjustment amount, means for determining a first injection quantity correction value based on the fuel concentration in the regeneration gas flow and the adjustment amount of the regeneration gas flow rate, means for correcting a pre-specified fuel quantity, that is to be supplied to the internal combustion engine by at least one injection valve, by the first injection quantity correction value, means for re-determining the exhaust composition following the supply of the corrected fuel quantity, means for determining a second injection quantity correction value by which the corrected fuel quantity supplied by the at least one injection valve is to be further corrected in order to adjust the exhaust gas composition to the reference composition, and means for correcting the fuel concentration of the regeneration gas flow based on the first and the second injection quantity correction values.