Unregulated fuel supply control unit

The invention relates to a method and apparatus for controlling the requested from a Kraftstoffzufuhrsteuergerat air-fuel ratio to maintain the optimum efficiency of a catalytic converter. The invention provides a fuel control apparatus comprising a disposed downstream of a catalyst detector for detecting fat Druchtrittes; a catalyst model with a calculator for calculating an amount of oxygen stored in the catalyst; a comparator for comparing a calculated amount of oxygen stored with a plurality of predetermined threshold values; in response to a comprises Sollwerteinstellmittel for adjusting the air-fuel ratio from the comparator and a signal received from the detector signal. In addition, a method for fuel supply control is provided.