A device used to facilitate the insertion of objects under a folded roof in the boot of a motor vehicle. The deformation framework may include at least a joint-analysis and a joint-aware deformation enabling a more realistic deformation of a joint-aware model. Further, when the successive-decrease or increase tendency has occurred and the last characteristic value is located within the control region outside the normal region, an alarm state is detected. The startup circuit disables quiescent current when the bandgap reference circuit is activated and a voltage of the capacitor exceeds a value equal to the difference between the voltage of the voltage supply when powered on and a voltage threshold of a switching device which disables the quiescent current.