An engine system, comprising:
- an internal combustion engine, comprising an intake, a first set of cylinders including at least a first cylinder and a first exhaust collector, and a second set of cylinders including at least a second cylinder and a second exhaust collector,
- a turbocharger,
- a first exhaust conduit, providing fluid communication between the first exhaust collector and the turbocharger,
- a second exhaust conduit, providing fluid communication between the second exhaust collector and the turbocharger,
- an exhaust gas recirculation system, comprising:
- a recirculation conduit, providing fluid communication between the first exhaust collector and the intake of the internal combustion engine, and
- a proportional recirculation valve, adapted to control a flow of exhaust gas in the recirculation conduit, and operable between an open position in which the flow of exhaust gas is allowed, and a closed position in which the flow of exhaust gas is prevented and which is occupied by the proportional recirculation valve at rest, the proportional recirculation valve continuously opening and closing between its open position and its closed position,
- a first proportional exhaust valve, adapted to control a flow of exhaust gas in the first exhaust conduit, and operable between an open position in which the flow of exhaust gas is allowed and which is occupied by the first proportional exhaust valve at rest, and a closed position in which the flow of exhaust gas is prevented, the first proportional exhaust valve continuously opening and closing between its open position and its closed position, and
- a second proportional exhaust valve, adapted to control a flow of exhaust gas in the second exhaust conduit, and operable between an open position in which the flow of exhaust gas is allowed and which is occupied by the second proportional exhaust valve at rest, and a closed position in which the flow of exhaust gas is prevented, the second proportional exhaust valve continuously opening and closing between its open position and its closed position,
- wherein the engine system comprises an actuator, and a kinematic chain configured to operate the proportional recirculation valve, the first proportional exhaust valve and the second proportional exhaust valve, the actuator comprising an output component driving the kinematic chain,
- wherein the engine system is in a neutral configuration when the first proportional exhaust valve and the second proportional exhaust valve are open and the proportional recirculation valve is closed, the output component of the actuator being in a neutral position when the engine system is in the neutral configuration,
- wherein the output component and the kinematic chain are configured such that a first movement of the output component, from its neutral position towards a first position and in a first direction, is adapted to drive the kinematic chain so as to open the proportional recirculation valve, close the first proportional exhaust valve and not operate the second proportional exhaust valve, the second proportional exhaust valve staying in its open position during the first movement,
- wherein the output component and the kinematic chain are configured such that a second movement of the output component, from its first position towards a second position and in the first direction, is adapted to drive the kinematic chain so as to close the second proportional exhaust valve, hold open the proportional recirculation valve and hold closed the first proportional exhaust valve;
- wherein the kinematic chain comprises:
- a main shaft connected to the output component of the actuator, and
- a first cam system, comprising a first cam mounted onto the main shaft and a first follower attached to the first proportional exhaust valve, wherein the profile of the first cam is configured such that:
- during the first movement of the output component, the first cam engages the first follower so that the first follower closes the first proportional exhaust valve, and
- during the second movement of the output component, the first cam engages the first follower so that the first follower hold closed the first proportional exhaust valve.