Patent ID: 8457822

Claim:
A method for controlling a hybrid power unit with power bypass for an automobile including at least two driving wheels, the hybrid power unit including a heat engine, at least two electric machines, and an infinitely variable transmission mechanically connecting the heat engine, the two electric machines, and the driving wheels, the method comprising: bringing an initially stopped heat engine, in an independent manner and in plural operating phases, to a rotation speed that is sufficient to be able to participate in propulsion of the vehicle, the vehicle moving under action of the electric machines, and during a first operating phase defined by a rotation speed of the heat engine below a first stored value, controlling the two electric machines in an open loop mode relative to the rotation speed of the heat engine for the heat engine to reach a rotation speed that is sufficient to be detected, wherein at least three operating phases are defined by comparing the rotation speed of the heat engine with at least one stored first value and one stored second value.