The present invention proposes an active chamber engine, which has at least one piston (2) slidably mounted in a cylinder (1), comprising isobaric and isothermal movement steps, a polytropic expansion step doing work; and a three-stage thermodynamic cycle comprising an exhaust stage at ambient pressure, preferably supplied with compressed air present in the high-pressure storage tank 12, the interior space of the cylinder 1 through which the piston passes It is divided into an activation chamber (CA) and an expansion chamber (CD), and compressed air is used to move the intake valve (9) to open and then close the intake duct, making it possible to supply the activation chamber of the engine, Compressed air is used for these operations and then reused in the engine to do additional work.
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