CONTROL SYSTEM OF POWER TRANSMISSION SYSTEM

A control system of a power transmission system is provided. The power transmission system is located between a motive power source (E, 10, 20) and drive wheels (W). The power transmission system includes a fluid coupling (46) and an engagement device (FC). The control system includes an electronic control unit configured to: obtain information concerning vibration of the power transmission system; determine whether the vibration of the power transmission system is in a resonance region of the power transmission system; control the engagement device (FC) such that the engagement device (FC) slips, when the electronic control unit (30) determines that the power transmission system is in the resonance region; and control the motive power source (E, 10, 20) when the electronic control unit (30) determines that the power transmission system is in the resonance region, such that a rotational speed of the motive power source (E, 10, 20) increases as compared with the case where the power transmission system is not in the resonance region.