Combustion process for internal combustion engine

Claim 1

A combustion process for an internal combustion engine having a main combustion chamber and at least one precombustion chamber connected with said combustion chamber by at least one opening, introducing a well ignitable fuel air mixture into said precombustion chamber, introducing, independently of the first-mentioned introducing step, fuel, air and recirculated exhaust gas directly into said main combustion chamber for producing an admixture therein, and igniting said admixture, providing a 3-way catalyst connected to the flow of exhaust gas from said combustion chamber, and measuring the oxygen content of the exhaust gas entering said catalyst for regulating the ratio of fuel and air entering said combustion and pre-combustion chambers in a nearly stoichiometric range, comprising the further step of supercharging, said supercharging being carried out by providing two separate exhaust gas turbo-superchargers and directing two partial flows of exhaust gas from said combustion chamber through said superchargers.