METHOD FOR CONTROLLING THE OPERATION OF A TWO-STROKE SPARK IGNITION INTERNAL COMBUSTION ENGINE
First Claim
1. 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), anda 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).
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Accused Products
Abstract
A method for controlling the operation of a spark ignition internal combustion engine is described. The engine includes: a combustion chamber, an intake duct for placing the combustion chamber in communication with the external, a throttle valve arranged inside the intake duct, a carburetor for introducing fuel into the intake duct to form an air/fuel mixture to be intaken into the combustion chamber, and a spark plug arranged inside the combustion chamber to generate a spark for igniting the combustion of the air/fuel mixture. The method includes: monitoring the opening degree of the throttle valve; monitoring the speed of the engine, preventing the spark plug from generating the spark, if the opening degree of the throttle valve drops below a first opening degree threshold value and the speed of the engine is greater than a first engine speed threshold value.
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Citations
9 Claims
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1. A method for controlling the operation of a spark ignition internal combustion engine (100), wherein the engine 100) comprises:
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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). - View Dependent Claims (2, 3, 4, 6, 7, 8)
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5. The method according to claim 5, wherein the instant when the spark plug (235) generates the spark may be provided in output from a calibration map which receives the speed (V) of the engine (100) and the opening (G) of the throttle valve (165) in input.
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9. A spark ignition internal combustion engine (100) comprising:
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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), a spark plug (235) arranged inside the combustion chamber (115) to generate a spark suitable to ignite the combustion of the air and fuel mixture, and an electronic unit (240) configured to monitor the opening degree (G) of the throttle valve (165), monitor the speed (V) of the engine (100) and prevent 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) and adjust 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).
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Specification