Patent ID: 6878094

Claim:
A power transmission control device for vehicle comprising: an electric rotating machine mounted on an internal combustion engine and functions as an electric motor and as a generator; a crank pulley mounted on a crankshaft of said internal combustion engine and drives said electric rotating machine by power transmission means; a planetary gear mechanism comprising a sun gear coupled to said crank pulley, a planetary gear supported on a carrier coupled to said crankshaft, and an internal gear operated in either a constraint state or a non-constraint state by means of an electromagnetic clutch; and control means that controls said electric rotating machine and said electromagnetic clutch; wherein, upon start of said internal combustion engine, said control means turns said electromagnetic clutch ON thereby operating said planetary gear mechanism as a reduction mechanism, and drives said internal combustion engine using said electric rotating machine as an electric motor; and wherein, when said internal combustion engine operates not higher than a predetermined engine speed and, either a remaining capacity of a battery, which is electrically supplied from said electric rotating machine, is not more than a predetermined level or an electrical load is in a high-load state after said internal combustion engine has started, said control means operates said planetary gear mechanism as a speed increasing mechanism by maintaining the ON state of said electromagnetic clutch, and drives said electric rotating machine, operating as a generator, at an increasing speed.