Internal combustion engine associated with a closed loop with Rankine cycle and with a water injection circuit at the intake of the engine.

The internal combustion engine (10) has cylinders (16), combustion chambers (18), an air intake (20) and a burnt gas exhaust (22). The engine further includes a dual mode heat exchanger (28) with a Rankine cycle closed loop (12) and a circuit (14) for injecting water into the engine intake system.