Method for managing a starting phase of a hybrid vehicle

A method for synchronizing a combustion engine for a vehicle provided with an electric motor and said combustion engine, the combustion engine comprising a crankshaft and at least one camshaft, the speed of each of the motor and the engine being controllable separately by a control unit of the vehicle, said method comprising :

• /a/ applying an electric motor rotation speed setpoint having a so-called predetermined initial value to the electric motor,
• /b/ applying a combustion engine synchronization strategy on the basis of signals representing rotation speeds of the camshaft and the crankshaft,
• /c/ if a camshaft signal failure is detected,
• /i/ selecting a so-called current combustion engine position assumption from among a plurality of possible assumptions, then
• /ii/ performing injection tests on the basis of the current assumption selected, by applying a combustion engine rotation speed setpoint the value of which is said predetermined initial value to the combustion engine,
• /iii/ once the combustion engine rotation speed setpoint has been reached, applying a modified electric motor rotation speed setpoint having a so-called subsequent value to the electric motor, while maintaining the rotation speed setpoint of the combustion engine at the initial value, then
• /iv/ processing a data signal the variations of which represent the rotation speed of the combustion engine in order to confirm or refute the current combustion engine position assumption,
• /v/ if the current combustion engine position assumption is refuted, selecting another position assumption from among the possible assumptions and then repeating Buchanan steps /ii/ to /v/ and, if the combustion engine position assumption is confirmed, ceasing to apply a rotation speed setpoint to the electric motor.