Control system for hybrid vehicle

A control system for a hybrid vehicle having

• a prime mover including an engine and a motor,
• an engagement device that is disposed between the engine and the motor to selectively enable a torque transmission between the engine and the motor and between the engine and driving wheels, and
• a control unit that selects a drive mode of the vehicle;
• wherein the control unit is configured to:
• determine an occurrence of failure in which a torque transmitting capacity of the engagement device cannot be altered;
• estimate the torque transmitting capacity of the engagement device;
• select a first drive mode in which the vehicle is powered by the engine in case the occurrence of failure of the engagement device is determined and the estimated torque transmitting capacity of the engagement device is larger than a first threshold value;
• select a second drive mode in which the vehicle is powered by the motor in case the occurrence of failure of the engagement device is determined and the estimated torque transmitting capacity of the engagement device is smaller than the first threshold value;
• and
• reduce a torque of the engine to be smaller than the estimated torque transmitting capacity of the engagement device in case the first drive mode is selected.