Method for controlling the operation of a two-stroke spark ignition internal combustion engine

A method for controlling the operation of a spark ignition internal combustion engine (100), wherein the engine (100) comprises:

• a combustion chamber (115),
• an intake duct (155) configured to place the combustion chamber (115) in communication with the external,
• a throttle valve (165) arranged in the intake duct (155),
• a carburetor (170) configured to introduce fuel into the intake duct (155) to form an air and fuel mixture intended to be intaken into the combustion chamber (115), and
• a spark plug (235) arranged inside the combustion chamber (115) to generate a spark for ignition of the combustion of the air and fuel mixture,
• the method comprises the steps of:
• monitoring the opening degree (G) of the throttle valve (165),
• monitoring the speed (V) of the engine (100),
• preventing the spark plug (235) from generating the spark, if the opening degree (G) of the throttle valve (165) drops below a first opening degree threshold value (GM) and the speed (V) of the engine (100) is greater than a first engine speed threshold value (VF);
• adjusting the instant when the spark plug (235) triggers the spark depending on the opening degree (G) of the throttle valve (165) and the speed (V) of the engine (100), if the opening degree (G) of the throttle valve (165) is comprised between a second and a third opening degree threshold value (GA, GC), wherein said second threshold value (GA) is below said third opening degree threshold value (GC).