Drive control system for hybrid vehicle

A drive control system for a hybrid vehicle,

• the drive control system comprising:
• a power split mechanism including a carrier, a sun gear and a ring gear as rotating elements, the power split mechanism being configured to carry out differential action, a torque output from an engine being transmitted to the carrier;
• a brake mechanism configured to selectively stop rotation of the carrier;
• a first motor coupled to one of the sun gear and the ring gear, the first motor being able to generate an electric power;
• an output member coupled to the other one of the sun gear and the ring gear;
• a second motor configured to add a driving torque for propelling the hybrid vehicle to a torque of the output member;
• and
• an electronic control unit configured to obtain a temperature of the power split mechanism based on a first time that is a duration of a motor driven state, allow the motor driven state when the obtained temperature obtained by the electronic control unit is lower than a predetermined upper limit temperature, and inhibit the motor driven state when the obtained temperature is higher than or equal to the upper limit temperature, the motor driven state being a state that satisfies following conditions i) to iii),
• i) rotation of the carrier is stopped by the brake mechanism,
• ii) a torque output from the first motor is transmitted to the output member via the power split mechanism, and
• iii) the second motor is outputting the driving torque.