Patent ID: 8793995

Claim:
An apparatus for recovering energy from an exhaust gas of an internal combustion engine, comprising: a turbocharger driven by the exhaust gas for generating compressed intake air for the internal combustion engine; an air compressor with at least one compression stage, wherein the air compressor is connected to an engine intake charge air line arranged to conduct the compressed intake air of the turbocharger into the internal combustion engine for extracting at least a partial quantity of the compressed intake air of the turbocharger out of the engine intake charge air line, the partial quantity of the compressed intake air of the turbocharger extracted by the air compressor is adjustable, the air compressor is connected to at least one air storage tank for storing compressed air generated by the air compressor, the air compressor is reversible to be driven by compressed air stored in the at least one air storage tank, and the turbocharger is connected to a secondary air supply device for the controlled supply of at least a partial quantity of compressed stored secondary air to the engine intake charge air line between the turbocharger and the engine in addition to the compressed intake air supplied to the internal combustion engine from the turbocharger, the apparatus further comprising: an exhaust-gas compressor configured to operate as an air motor, wherein the exhaust-gas compressor is connected to an exhaust gas line arranged to receive the exhaust gas from the internal combustion engine for extracting at least a partial quantity of the exhaust gas out of the exhaust line, and the exhaust-gas compressor is connectable to the internal combustion engine to supply torque to the internal combustion engine.