Abstract: A method of scavenging the residual burnt gas of a direct-injection supercharged multi-cylinder internal-combustion engine(10), notably of diesel type, running under partial loads, with a piston moving in a reciprocating motion between a top dead center (PMH) and a bottom dead center (PMB) includes a burnt gas scavenging stage that is carried out by a sequence of opening/closing at least one exhaust valve (18) during engine exhaust phase (E) and at least one sequence of opening/closing at least one intake valve (28) during this exhaust valve opening/closing sequence. The method includes, during the scavenging stage, in controlling the closing time of intake valve (28) so as to cause a decrease in exhaust pressure (Pe) in order to achieve a pressure differential between intake pressure (Pa) and exhaust pressure (Pe) favorable to intake pressure (Pa).

Abstract: The present invention relates to a method of scavenging residual burnt gas of a direct-injection internal-combustion engine, notably of diesel type, comprising at least one cylinder (10) including a combustion chamber (12), at least one exhaust means (14) with an exhaust valve (18) controlled by exhaust control means (42), at least one intake means (24) with an intake valve (28) controlled by intake control means (40) and a processing unit (44) receiving the values relative to the intake pressure (Pa) and to the exhaust pressure (Pe) of the engine. The method consists, when the engine runs under low speed and high load conditions, in carrying out a sequence of opening/closing of exhaust valves (18) during the exhaust phase of the engine, during this exhaust valve opening/closing sequence, in carrying out at least one sequence of opening/closing of intake valves (28) so as to achieve scavenging of the residual burnt gas.

Abstract: The present invention relates to a method of scavenging the residual burnt gas of a direct-injection multi-cylinder internal-combustion engine (10), notably of diesel type, with a piston moving in a reciprocating motion between a top dead center (PMH) and a bottom dead center (PMB), wherein a burnt gas scavenging stage is carried out by means of a sequence of opening/closing at least one exhaust valve (18) during exhaust phase (E) of the engine and of at least one sequence of opening/closing at least one intake valve (28) during this exhaust valve opening/closing sequence. According to the invention, the method consists in starting the sequence of opening/closing exhaust valve (18) at a crank angle (e1) located after the bottom dead center (PMBe) of the exhaust phase and in ending this sequence at most at the next top dead center (PMHa).

Abstract: The present invention relates to a method of scavenging the residual burnt gas of a direct-injection supercharged multi-cylinder internal-combustion engine (10), notably of diesel type, running under partial loads, with a piston moving in a reciprocating motion between a top dead center (PMH) and a bottom dead center (PMB), wherein a burnt gas scavenging stage is carried out by means of a sequence of opening/closing at least one exhaust valve (18) during engine exhaust phase (E) and of at least one sequence of opening/closing at least one intake valve (28) during this exhaust valve opening/closing sequence. According to the invention, the method consists, during the scavenging stage, in controlling the closing time of intake valve (28) so as to cause a decrease in exhaust pressure (Pe) in order to achieve a pressure differential between intake pressure (Pa) and exhaust pressure (Pe) favourable to intake pressure (Pa).

Abstract: The present invention relates to a method of scavenging residual burnt gas of a direct-injection internal-combustion engine, notably of diesel type, comprising at least one cylinder (10) including a combustion chamber (12), at least one exhaust means (14) with an exhaust valve (18) controlled by exhaust control means (42), at least one intake means (24) with an intake valve (28) controlled by intake control means (40) and a processing unit (44) receiving the values relative to the intake pressure (Pa) and to the exhaust pressure (Pe) of the engine. According to the invention, the method consists, when the engine runs under low speed and high load conditions, in: carrying out a sequence of opening/closing of exhaust valves (18) during the exhaust phase of the engine, during this exhaust valve opening/closing sequence, in carrying out at least one sequence of opening/closing of intake valves (28) so as to achieve scavenging of the residual burnt gas.