Patent ID: 7819094

Claim:
Fan system ( 1 ) for conducting regulated cooling for an internal combustion engine ( 2 ) in a motor vehicle comprising an electric fan motor ( 4 ) and a control unit ( 5 ) for triggering the fan motor, wherein said control unit ( 5 ) triggers the fan motor with a regulation control variable as a function of a desired cooling power, characterized in that the control unit ( 5 ) is constructed in such a way that it triggers the fan motor ( 4 ) at a specific point in time independent of the desired cooling power with a cleaning control variable that is increased with respect to the regulation control variable for a predetermined period of time, and characterized in that the control unit ( 5 ) is constructed in such a way that it triggers the fan motor ( 4 ) with the cleaning control variable only if a predetermined normal operating duration has passed after a preceding triggering by the increased control variable and if the motor vehicle is in a specific operating state, the specific operating state being the motor vehicle is moving at a speed greater than a minimum speed and/or the rpm of the internal combustion engine is greater than a minimum rpm.