A control device for a vehicular drive system including (a) a differential
mechanism operable to distribute an output of an engine (8) to a first
electric motor and a power transmitting member, (b) a second electric
motor disposed in a power transmitting path between the power
transmitting member and a drive wheel of a vehicle, and (c) a
differential-state switching device operable to place the differential
mechanism selectively in one of a differential state in which the
differential mechanism is operable to perform a differential function and
a locked state in which the differential mechanism is not operable to
perform the differential function, the control device including an
engine-stop switching control portion operable to control the
differential-state switching device to place the differential mechanism
in the differential state, upon stopping of the engine, so that the
engine speed can be rapidly lowered to zero by controlling the first
electric motor in the differential state of the differential mechanism,
so as to reduce a possibility of occurrence of a resonance phenomenon of
the drive system and a resultant vibration of the vehicle when the engine
is stopped.