The engine has an internal combustion engine (2) with an exhaust line (8) and a valve (20) in an air line (4). A turbo compressor (12) has a turbine (10) on the exhaust line and a compressor (16) on the air line. Another turbo compressor (22) has a turbine (24) on the air line in parallel to the valve and an electric motor (28) adapted to drive the turbine (24) and compressor (26) in rotation. Independent claims are also included for the following: (a) a motor vehicle having a supercharged engine; and (b) a method of operating a supercharged engine.
