A method of fail safe operation of a hybrid vehicle for controlled eliciting an emergency operation of the vehicle enabling replacement measure and apparatus for performing this method

The invention relates to a method of fail-safe operation of a hybrid vehicle with a combustion engine, an electric motor and other vehicle units, one then another emergency operation of the vehicle enabling substitute measure is caused in case of failure of a vehicle unit, wherein prior to causing the replacement measure is the dynamic driving situation in which the vehicle is characteristic operating variable is detected and is compared with at least one threshold, wherein the replacement measure exceeds or falls below the limit value is caused. The invention also relates to a device comprising means for performing a corresponding method.