Method for controlling a variable-speed transmission device with epicyclic gear trains of a power train, in particular for a hybrid vehicle

Abstract

The present invention relates to a method of controlling a variable-speed transmission device of a powertrain, in particular for a hybrid vehicle, comprising a driving/receiving machine (20), a thermal engine (10), a speed variation device (14) including an engine epicyclic gear train (24) with a sun gear (34) and a crown (46), each connected to engine shaft (12) by a controlled coupling (26, 28) and to a fixed part (44) of the powertrain by a one-way automatic coupling (30, 32) and a planet gear carrier (52), and a machine epicyclic gear train (68) arranged on a shaft (70) substantially parallel to engine shaft (12) and connecting engine epicyclic gear train (24) to a track (94, 96) for motion transmission to a drive axle (16), said gear train comprising a sun gear (72), a crown (86) and a planet gear carrier (78). According to the invention, the method consists in blocking sun gear (72) and crown (86) of machine epicyclic gear train (68) to provide motion of the vehicle by machine (20) alone or in combination with engine (10).

Dependencies are inferred from the claim text.