a method for controlling a hybrid power unit with power bypass for an automobile including at least two driving wheels , wherein the power unit includes a thermal engine , at least two electric machines , and an infinitely variable transmission mechanically connecting the thermal engine , the two electric machines , and the driving wheels . in the method , an initially stopped thermal engine is brought , in an independent manner and in plural operation phases , to a rotation speed that is sufficient for participating in propulsion of the vehicle , the vehicle moving under action of the electric machines .