Pre-chamber ignition system and procedure for an internal combustion engine

A pre-chamber ignition apparatus for an internal combustion engine comprising:

• a pre-chamber having at least one solenoid fuel injector disposed inside the pre-chamber,
• an apparatus body associated with a cylinder head of the internal combustion engine so as to be in fluid communication with a combustion chamber of said cylinder head through at least one connection hole,
• a microwave ignition device, equipped with an antenna configured to generate microwaves suitable to ignite an air/fuel mixture in the pre-chamber inside said body,
• wherein the apparatus body comprises an upstream portion configured to allow the housing and fixing of said microwave ignition device and a hollow downstream portion delimiting said pre-chamber, in fluid communication with the combustion chamber of said cylinder head of the engine, the downstream portion being provided with said at least one connection hole,
• wherein the hollow downstream portion includes a reflection wall opposite the microwave ignition device and shaped to receive and concentrate the microwaves generated by the microwave ignition device for the mixture contained in the pre-chamber thereby amplifying the pre-chamber combustion.