In this paper was presented the kinematics chart and the calculus methodology used at projecting an hydraulic command system used at adaptive heat engines at which the compression proportion’s adjustment and the lift’s adjustment is made automatically while working. The this paper is presented the modality  of experimental determination of an  hydraulic command system’s command lever position watching the engine’s rotational speed and of the throttle valve’s position, as the analysis of the command system’s adjustment possibilities watching the functioning engine speed of the engine and the adjusted pressure. Next we’ll analyze the command system’s adjustment possibilities watching the hydraulic command system’s constructive parameters and of the engine’s functional parameters.