Turbo-charged gasoline engine with variable control of intake valves

摘要

In a turbo-charged gasoline engine the opening profile of each intake valve, defined by the opening and closing moments and by the lift, or by the opening stroke of the intake valve, is varied according to the engine operating conditions, so as to reduce or completely eliminate the intervention of a “waste-gate” valve and ensure that in each engine operating condition each cylinder processes only the quantity of air necessary for optimal combustion, with an air/gasoline dosage value close to the stoichiometric ratio.