Patent ID: 8789367

Claim:
A system for recovering engine exhaust energy, comprising: an exhaust system including a first exhaust branch and a second exhaust branch, a portion of the first exhaust branch being in fluid communication with a portion of the second exhaust branch; a first group of exhaust valves and a second group of exhaust valves associated with a plurality of engine cylinders; a first exhaust energy recovering assembly and a second exhaust energy recovering assembly fluidly connected in series and configured to recover energy from exhaust gases in the second exhaust branch; and a control mechanism configured to control at least one of the first group of exhaust valves and the second group of exhaust valves according to a determined timing strategy based on at least one engine operating parameter so that a pressure of exhaust gas received by the first exhaust branch is higher than a pressure of exhaust gas received by the second exhaust branch, wherein the portion of the second exhaust branch is located downstream of the first exhaust energy recovering assembly and the second exhaust energy recovering assembly.