Hydraulic radial piston motor and control by cylinder

hydraulic motor (10) piston pump with a cylinder block (12), two principal conduits (26,28), a fluid distributor (30), a dispensing valve (32) per cylinder, and a control system (34) of dispensing valves (32). The engine comprises at least two elementary motors, and can operate in different regimes in which in each elementary motor, each of the cylinders is connected on the rising ramps with a first main conduit and descending ramps with a second main conduit; a first elementary motor being motor in a first regime, and inactive or antagonist in a second scheme, the control system controlling the rest of the hydraulic motor in the same way in the two regimes. hydraulic circuit comprising said motor. A method of controlling such an engine.