Patent ID: 7493889

Claim:
A method for controlling a composition of a fuel/air mixture supplied to an internal combustion engine, wherein the internal combustion engine has a cylinder with a combustion chamber that is provided with a spark plug and delimited by a piston driving a crankshaft, wherein an ignition control unit is connected to the spark plug that, depending on a rotary speed of the crankshaft, triggers at an adjusted ignition timing an ignition spark at the spark plug, wherein a speed control circuit maintains an actual rotary speed of the crankshaft within preset limits, and wherein a controllable metering device is provided for at least one component of the fuel/air mixture; the method comprising the steps of: introducing at a predeterminable point in time a disruptive variable into a valve control circuit; monitoring and evaluating an activity of an engine speed control circuit immediately after introducing the disruptive variable; adjusting, depending on a result of the step of evaluating, at least one parameter having an effect on operation of the internal combustion engine.