Control system for hybrid vehicle

A control system for a hybrid vehicle comprising:

• an engine;
• a first motor that is connected to an output shaft of the engine in a power transmittable manner;
• a first clutch that selectively transmits power from the engine and the first motor to a pair of drive wheels, and that is adapted to be engaged partially while slipping to vary a torque transmitting capacity continuously;
• a second clutch that selectively transmits the power from the engine and the first motor to the pair of drive wheels, and that is adapted to be engaged partially while slipping to vary a torque transmitting capacity continuously;
• a second motor that is connected to the pair of drive wheels without interposing the engine and the first motor therebetween;
• a detector that collects at least data relating to a heat of the first clutch, and a speed of the engine;
• and
• a controller that controls the engine, the first clutch, the second clutch, the first motor, and the second motor,
• wherein the controller is configured to
• obtain a temperature of the first clutch based on the data relating to the heat of the first clutch when engaging the first clutch completely while causing the first clutch to slip,
• execute a transient slip control to cause the second clutch to slip while bringing the slipping first clutch into complete engagement if the temperature of the first clutch is higher than a predetermined level,
• generate a collection torque to suppress a change in a speed of the engine by the first motor, if the speed of the engine is changed from a target speed more than a predetermined value during execution of the transient slip control, and
• operate the second motor to generate a torque counteracting against the collection torque generated by the first motor.