CONTROL SYSTEM FOR HYBRID VEHICLE

An electronic control unit (30) included in a control system is configured to execute a change of a combustion mode in an inertia-phase period during a gear shift operation or after the gear shift operation is completed when a request for the combustion mode change and a request for a gear shift of the transmission mechanism (10) overlap. The electronic control unit (30) is configured to execute the combustion mode change in the inertia-phase period during the gear shift operation when i) and ii) are established, and execute the combustion mode change after the gear shift operation is completed when i) and iii) are established: i) the combustion mode change is accompanied by an increase in engine power; ii) the power running mode is executed during the gear shift operation; and iii) the regeneration mode is executed during the gear shift operation.