Abstract: A Double Sliding Spark Plug as a Volume Ignition System for Internal Combustion Engines causes ignition processes of the air-fuel mixture by two simultaneously conical or cylindrical sliding discharges between a conical or cylindrical high voltage electrode (1) located inside two solid insulation parts (4) and (5) and two circular low voltage electrodes (2) and (3). Those sliding discharges are on outer large conical or cylindrical surfaces of insulation parts (4) and (5) with high diameters. The outside low voltage electrode (2) is connected to a metallic body of this spark plug and to the outer conical or cylindrical surface of the outside insulation part (4). The inside cylindrical or conical low voltage electrode (3) is connected to the inner conical or cylindrical surface of the inside insulation part (5).

Abstract: A volume ignition system for internal combustion engines causes ignition processes of fuel by location of a high voltage electrode (1) of a spark plug inside an engine's cylinder. Electrical discharges are created basically from the high voltage electrode (1), during movement of a piston (6) with a connected ring (5), as low voltage electrodes, around the high voltage electrode (1), and to a low voltage electrode (2), connected to the spark plug's metallic body, as sliding discharges. Sliding discharges are created over an insulator (3) along metallization (4), with an extremely large surface area. Discharge plasma is injected into a combustion chamber with flames from inside of the ring (5) and a hollow (7).