Propulsion assembly for a motor vehicle

A propulsion assembly for a motor vehicle, the propulsion assembly comprising:

• an internal combustion engine comprising at least one movable member according to an operating regime of said engine, and
• a turbocharger comprising a turbine adapted to expand exhaust gases of said engine by generating work and a compressor adapted to compress air by work generated by the turbine to supercharge said engine,
• the turbocharger comprising a turbocharger shaft coupled to the turbine in such a manner as to be driven into a rotation by the work generated by the turbine and further coupled to the compressor to drive the compressor via the work generated by the turbine to compress air,
• characterized by further comprising mechanical transmission means configured to couple the movable member to the turbocharger shaft, thereby establishing a transmission of motion between the movable member and the turbocharger shaft,
• the mechanical transmission means comprising a transmission device controllable to adjust a torque transmission ratio between the movable member and the turbocharger shaft,
• further comprising a control unit configured to control the transmission device by controlling the torque transmission ratio as a function of one or more control quantities of said engine,
• wherein the control unit is configured to control the torque transmitted to the turbocharger shaft by adjusting the torque transmission ratio as minimizer or maximizer of an objective function including a current output torque of the engine, wherein the mechanical transmission means comprises two turbocharger shafts, the mechanical transmission means configured to couple the movable member to both the compressor shafts, thereby establishing a transmission of motion between the movable member and the turbocharger shafts, wherein respective speed transmission ratios between the turbocharger shafts and the movable member are identical to one another.

A propulsion assembly for a motor vehicle, the propulsion assembly comprising:

• an internal combustion engine comprising at least one movable member according to an operating regime of said engine, and
• a turbocharger comprising a turbine adapted to expand exhaust gases of said engine by generating work and a compressor adapted to compress air by work generated by the turbine to supercharge said engine,
• the turbocharger comprising a turbocharger shaft coupled to the turbine in such a manner as to be driven into a rotation by the work generated by the turbine and further coupled to the compressor to drive the compressor via the work generated by the turbine to compress air,
• characterized by further comprising mechanical transmission means configured to couple the movable member to the turbocharger shaft, thereby establishing a transmission of motion between the movable member and the turbocharger shaft,
• the mechanical transmission means comprising a transmission device controllable to adjust a torque transmission ratio between the movable member and the turbocharger shaft,
• further comprising a control unit configured to control the transmission device by controlling the torque transmission ratio, wherein the control unit is configured to control the torque transmitted to the turbocharger shaft by adjusting the torque transmission ratio to minimize a difference between a target torque and a current output torque of the engine, wherein the mechanical transmission means comprises two turbocharger shafts, the mechanical transmission means configured to couple the movable member to both the turbocharger shafts, thereby establishing a transmission of motion between the movable member and the turbocharger shafts, wherein respective speed transmission ratios between the turbocharger shafts and the movable member are identical to one another.