Controlling vehicle adjustment device e.g. for intake air valve flap

摘要

The vehicle adjustment device to be controlled has a stepper motor (12). The motor (12) has at least two phases. The stepper motor phases are controlled by a computer unit (24) with a pulse width modulation signal. The computer unit (24) has elements which form the pulse width modulation signal in dependence on a predetermined value representing the current through the respective coils. The computer has influence parameters which affect this formation. A correction is made in dependence on these parameters in the sense of an adjustment of the adjustment device independent of the parameters.