Device for controlling power transmission apparatus

Abstract

A control device of a power transmission device includes a damper absorbing torsional vibration between a fluid transmission device with a lockup clutch and an engine, the power transmission device is disposed with a connecting/disconnecting device capable of connecting and interrupting power transmission on the downstream side of the fluid transmission device, the control device has a lockup engagement control means engaging the lockup clutch while the power transmission is interrupted by the connecting/disconnecting device in a predetermined engine rotation speed range lower than an idle rotation speed when the engine is started, the lockup engagement control means includes: a resonance due to frequency entrainment determination means determining whether a resonance due to frequency entrainment occurs that blocks an increase in an engine rotation speed NE depending on whether a predefined resonance determination time is exceeded by a required start time of the engine or an elapsed time until the engine rotation speed NE reaches a predetermined rotation speed; a lockup engagement means engaging the lockup clutch while the power transmission is interrupted by the connecting/disconnecting device when the resonance due to frequency entrainment determination means determines that the resonance due to frequency entrainment occurs.

Dependencies are inferred from the claim text.