Method and device for operating a hybrid vehicle comprising an electric energy store, an electric motor and an internal combustion engine

The invention essentially relates to a method and a device for operating a hybrid vehicle comprising an electric energy store (e.g. a high-voltage battery), an electric propulsion system and an internal combustion engine; a special operating strategy that can be initiated for the internal combustion engine allows the state of charge of the energy store to be increased when predefined acoustic conditions are met. The special operating strategy has a performance-enhancing effect by raising the load point until acoustic limits are reached which are ascertained in real time, can preferably be predefined in a variable manner and are defined in accordance with ascertained potentials for masking specific acoustic events. In other words, the disclosed method and device for carrying out said methodraise the acoustic limits for controlling the load point of the internal combustion engine at least to the level that is currently admissible as a result of at least one acoustically relevant event being masked, possible aco