Drive control device for hybrid vehicle

A drive control device for a hybrid vehicle provided with:

• a differential device which includes a first differential mechanism and a second differential mechanism and which has four rotary elements;
• and an engine, a first electric motor, a second electric motor and an output rotary member which are respectively connected to said four rotary elements, and wherein one of said four rotary elements is constituted by a rotary component of said first differential mechanism and a rotary component of said second differential mechanism which are selectively connected to each other through a clutch, and one of the rotary components of said first and second differential mechanisms which are selectively connected to each other through said clutch is selectively fixed to a stationary member through a brake, said hybrid vehicle being selectively placed in a plurality of drive modes according to respective combinations of engaged and released states of said clutch and said brake, the drive control device comprising:
• a drive mode determining portion configured to switch said drive mode on the basis of a temperature condition of a drive system of the hybrid vehicle,
• said drive mode determining portion switching said drive system to a drive mode in which said clutch is placed in the engaged state, when a temperature of the drive system has become equal to or higher than a predetermined threshold value.