In a tire pressure control system of a motor vehicle having a plurality of wheels at respective predetermined wheel positions, a method for carrying out an allocation of tire pressure control devices of a tire pressure control system to the predetermined wheel positions of the motor vehicle, the system further including:
- a central unit;
- each of said tire pressure control devices functioning to transmit an individual identifier to said central unit at time intervals and being assignable to a corresponding one of said wheels and the assignment (identifier/wheel position) being stored in said central unit;
- a plurality of rpm sensors assigned to corresponding ones of said wheels and said rpm sensors being fixedly mounted at respective ones of said wheel positions;
- said central unit storing the allocation of said rpm sensors to said wheel positions, respectively;
- a plurality of rotation sensors assigned to corresponding ones of said tire pressure control devices;
- the method comprising the steps of:
- switching on any one of said rotation sensors for a first time interval (I.sub.1) whereby said rotation sensor supplies a rotation sensor signal;
- during said first time interval (I.sub.1), determining a first angular position of the one wheel to which said one rotation sensor is assigned from said rotation sensor signal;
- the tire pressure control device corresponding to said one wheel transmitting the individual identifier thereof to said central unit at a first time point (t.sub.1) when said wheel assumes said first angular position;
- later switching on said one rotation sensor for a second time interval (I.sub.2);
- during said second time interval (I.sub.2), determining a second angular position of the one wheel to which said one rotation sensor is assigned from said rotation sensor signal with said first angular position and said second angular position conjointly defining an angular offset;
- the tire pressure control device corresponding to said one wheel transmitting the individual identifier thereof to said central unit at a second time point (t.sub.2) when said one wheel assumes said second angular position with said central unit knowing said angular offset between said first defined angular position and said second defined angular position;
- in a time interval (I.sub.3) from said first time point (t.sub.1) to said second time point (t.sub.2), measuring the rotations of said wheels with corresponding ones of said rpm sensors and transmitting the rotation measurement for each wheel position to said central unit;
- in said central unit, subtracting a whole number of rotations from each of said rotation measurements to obtain respective angular offsets and then ascertaining which one of said angular offsets corresponds to said angular offset between said first defined angular position and said second defined angular position;
- and,
- in said central unit, assigning the individual identifier to the wheel position corresponding to said one angular offset.