Control system with model-based security monitoring of an electronically controlled actuator in the motor vehicle

The invention relates to a system for controlling one with an electric servomotor (4) equipped actuator in a motor vehicle. Using the example of an electromotive steering actuator having electronic steering system are according to the invention by a model-based monitoring device (11A-15A) as a function of desired values ​​of the electric servo-motor (4), of by respective sensors (6, 7, 8) measured actual values ​​(I¶ist¶ , delta¶M, ist¶, delta¶L¶ ') and (the driving state a¶q¶, z. BV¶Fzg¶) and simulating on the basis of a desired behavior of the actuator (3, 4) and a the controlled systems contained model (12, 13, 14) output variables (DELTAM¶L¶, DELTAdelta¶M¶, DELTAI) for evaluating a quality adjustment of the actuator (3, 4) and thus criteria for possible cut-off or for initiating an emergency operation is generated (Figure 5).