Method and system for starting an internal combustion engine

A method for starting an internal combustion engine (ICE) having a crankshaft and an electric turning machine (ETM) operatively connected to the crankshaft, the method comprising:

• sensing a voltage of a capacitance connected to the ETM and configured to power the ETM;
• detecting a rotation of the crankshaft resulting from an actuation of a recoil starter operatively connected to the crankshaft;
• in response to detecting the rotation of the crankshaft, determining if an assisted start condition is met;
• in response to the assisted start condition being met, delivering power from the capacitance to the ETM and the ETM assisting the recoil starter to turn the crankshaft for starting the ICE;
• in response to the assisted start condition not being met, continuing to turn the crankshaft with the recoil starter without assistance from the ETM for starting the ICE;
• determining if the ICE has started;
• and
• in response to the ICE being started, delivering power from the ETM to the capacitance,
• the assisted start condition comprising:
• the voltage of the capacitance being at or above an assisted start voltage threshold;
• a temperature of the ICE being at or above an engine temperature threshold;
• and
• a temperature of an engine control unit (ECU) being at or above an ECU temperature threshold, the ECU controlling operation of the ICE once the ICE has started.

A method for starting an internal combustion engine (ICE) having a crankshaft and an electric turning machine (ETM) operatively connected to the crankshaft, the method comprising:

• sensing a voltage of a capacitance connected to the ETM and configured to power the ETM;
• detecting a rotation of the crankshaft resulting from an actuation of a recoil starter operatively connected to the crankshaft;
• in response to detecting the rotation of the crankshaft:
• equalizing a voltage of a capacitor and of the capacitance, the capacitor being connected in parallel with the capacitance, and
• determining if an assisted start condition is met,
• in response to the assisted start condition being met, delivering power from the capacitance to the ETM and the ETM assisting the recoil starter to turn the crankshaft for starting the ICE;
• in response to the assisted start condition not being met, continuing to turn the crankshaft with the recoil starter without assistance from the ETM for starting the ICE;
• determining if the ICE has started;
• and
• in response to the ICE being started, delivering power from the ETM to the capacitance.