HYBRID VEHICLE DRIVE SYSTEM

A drive system of a hybrid vehicle including an internal combustion engine, a first motor-generator, a power transmission path, a power division mechanism, a second motor-generator, a one-way clutch, a mode change mechanism, and an electronic control unit having a microprocessor and memory. The microprocessor is configured to control the first motor-generator so as to reduce a reaction force acting on the first motor-generator at a time at which a state of the one-way clutch changes from an unlocked state to a locked state, when a drive mode is changed from an EV mode to a HV mode through a start mode by the mode change mechanism.