Method and an arrangement for controlling the working cycle of a turbocharged internal combustion engine

A method for controlling the working cycle of an internal combustion engine (1) which is supercharged by means of at least one exhaust-driven turbo-compressor (4, 5) and each cylinder of which having firstly at least one inlet valve (2) to which an induction system is connected, said induction system including the compressor (6, 8) of the or each turbo-compressor (4, 5) and an induction or inlet line (12) for delivering air to the inlet valve (2) from the compressor (6, 8) of the turbo-compressor or of at least one of the turbo-compressors (4, 5), and secondly an outlet valve (3) from which the exhaust gases are passed from the cylinder through an outlet line (13) to the turbine (7, 9) of the turbo-compressor or of at least one of the turbo-compressors (4, 5), characterized by placing each cylinder in communication with the induction system during each engine working cycle by opening and closing the inlet valve (2) during the induction stroke and also through the medium of a separate pressure control valve (19) which is connected to the induction system by means of a pressure control line (20) and which is opened when the piston, during the compression stroke, is located in a first predetermined position (C, F) in the cylinder, in or at a distance from the bottom-dead-center position (C) of the piston, and is closed when the piston, during the compression stroke, is located at a second predetermined position (D) in the cylinder at a greater distance from the bottom-dead-center position (C) of the piston, opening the inlet valve (2) when the piston is located in the vicinity of its top-dead-center position (C) of the piston, opening the inlet valve (2) when the piston is located in the vicinity of its top-dead-center position (A) after the exhaust stroke of the working cycle;

• and closing the inlet valve (2) during the induction stroke, when the piston is located in a third predetermined position (B) at a distance from the bottom-dead-center position (C) of the piston.