A method provides a technique for optimally combining communication beams. The electrooptical device includes a display panel including a plurality of pixel rows. Near a fuel gas outlet, the inlet openings of the holes facing the electrode are oriented at least slightly to the area of the fuel gas feed. The main surrounding wall includes a second support disposed in the receiving space and spacedly above the first support. The main processor periodically compares samples of the inputs that are simultaneously taken by the main processor and watchdog processor and limits the speed of the engine when the samples differ from each other by more than a predetermined amount.