A method for operating a four-stroke internal combustion engine including a crankshaft coupled to a piston, which includes moving the piston in accordance with a sequence of four different strokes; mechanically driving an electric power generator with the crankshaft during the operating of the engine;...http://www.google.fr/patents/US8186331?utm_source=gb-gplus-shareBrevet US8186331 - Spark suppression for a genset
