Patent ID: 8126639

Claim:
A method of controlling an air system for an internal combustion engine which includes a combustion gas inlet tract connected to the internal combustion engine for supplying combustion gases thereto, an outlet tract connected to the internal combustion engine for removing exhaust gases therefrom, a recirculation tract connected between the outlet tract and the combustion gas inlet tract for recirculating exhaust gases to the combustion gas inlet tract, a first valve in the recirculation tract controlled by a first actuating element connected to a first controller via a first switch, a fresh air tract connected to the combustion gas inlet tract for supplying fresh air thereto, and a second valve in the fresh air tract controlled by a second actuating element connected to a second controller via a second switch, the method comprising the step of operating the first and second switches so that only one of the first and second actuating elements is controlled by a respective controller, a second of the first and second actuating elements being controlled by a respective defined value.