Patent ID: 8091357

Claim:
A system for recovering engine exhaust energy, comprising: an exhaust system including a first exhaust branch and a second exhaust branch; a first and a second group of exhaust valves associated with a plurality of engine cylinders; an energy recovering assembly including a turbo compounding device configured to receive exhaust gas from the first exhaust branch; and a control mechanism configured to variably control at least one of the first and second groups of exhaust valves according to a determined timing strategy based on at least one engine operating parameter so that the first exhaust branch receives higher pressure exhaust gas than the second exhaust branch; the energy recovering assembly further including a turbocharger system including a turbine and a compressor; wherein the first exhaust branch includes a first portion in fluid communication with a second portion of the second exhaust branch, the first portion of the first exhaust branch is located downstream of a turbine of the turbo compounding device, and the second portion of the second exhaust branch is located downstream of the second exhaust manifold and upstream of the turbine of the turbocharger system and an exhaust gas treatment device.