Turbo compound internal combustion engine

Claim 1

An internal combustion engine exhaust energy recovery apparatus comprising: an engine supercharger means comprising a blower adapted to receive exhaust gases from an engine and to supply intake air thereto; a recovery turbine disc adapted for rotation with a drive shaft coupled to the engine; a recovery turbine housing defining a recovery inlet connected to receive engine exhaust gases discharged by said supercharger means; a recovery exhaust port for discharging exhaust gases, a recovery turbine chamber enclosing said recovery turbine disc, and a convoluted recovery passage extending between said recovery inlet and a periphery of said recovery turbine disc; recovery partition means disposed in said recovery housing and separating said convoluted recovery passage into first and second recovery passages each providing communication between said recovery inlet and said periphery of said recovery turbine disc; and a recovery valve disposed in said first recovery passage and operable between an open position allowing exhaust gas flow through said first recovery passage and a closed position producing diversion of exhaust gas into said second recovery passage.