Method for starting a thermal engine of a hybrid vehicle

A method for starting an internal combustion thermal engine of a hybrid vehicle comprising:

• the thermal engine provided with a drive shaft;
• at least one pair of driving wheels;
• a transmission, which transmits the motion from the thermal engine to the driving wheels and comprises a clutch;
• and
• an electric machine, which is mechanically connected to the clutch transmission downstream of the clutch, so that the clutch is interposed between the electric machine and the thermal engine;
• the starting method comprises the steps of:
• opening the clutch to separate the electric machine from the thermal engine;
• separating the electric machine from the driving wheels;
• determining the temperature of the thermal engine;
• determining a launch rotation speed according to the temperature of the thermal engine;
• making the electric machine rotate by operating the electric machine as motor to reach the launch rotation speed;
• closing the clutch when the electric machine reaches the launch rotation speed;
• and
• determining a closing speed of the clutch according to the launch rotation speed.