Two-stroke engine and method for operating a two-stroke engine

A method for operating a two-stroke engine, the two-stroke engine including a cylinder having a combustion chamber formed therein, the two-stroke engine having a piston configured to be guided in a reciprocating manner in the cylinder, the combustion chamber being delimited by the piston, the two-stroke engine further having a crankcase defining a crankcase interior and a crankshaft rotatably mounted in the crankcase, the piston being configured to drive the crankshaft, the two-stroke engine having a first intake channel which opens into the crankcase interior via a first intake channel opening, the combustion chamber having an outlet opening, the cylinder having a cylinder bore, the two-stroke engine further including at least one transfer channel opening via a transfer window at the cylinder bore and opening into the crankcase interior via a passage opening, the at least one transfer channel being configured to establish a fluidic connection between the crankcase interior and the combustion chamber in a region of bottom dead center of the piston;

• the two-stroke engine having a second intake channel configured to supply scavenging air to the at least one transfer channel, the method comprising the steps of:
• supplying air to the first intake channel and the second intake channel during operation of the two-stroke engine;
• and,
• supplying an entire quantity of fuel to be supplied to the two-stroke engine directly to the crankcase interior via a metering device.

A two-stroke engine comprising:

• a cylinder having a combustion chamber formed therein;
• a piston configured to be guided in a reciprocating manner in said cylinder;
• said combustion chamber being delimited by said piston;
• a crankcase defining a crankcase interior;
• a crankshaft rotatably mounted in said crankcase;
• said piston being configured to drive said crankshaft;
• a first intake channel which opens into said crankcase interior via a first intake channel opening;
• said first intake channel and said crankcase interior forming a first flow path;
• a throttle element disposed in said first intake channel;
• said combustion chamber having an outlet opening;
• said cylinder having a cylinder bore;
• at least one transfer channel opening out via a transfer window at said cylinder bore and opening into said crankcase interior via a passage opening;
• said at least one transfer channel being configured to establish a fluidic connection between said crankcase interior and said combustion chamber in a region of bottom dead center of said piston;
• a second intake channel for supplying scavenging air to said at least one transfer channel;
• wherein a connection between said second intake channel and said at least one transfer channel and a connection between said first intake channel opening and said crankcase interior as a function of a rotary position of said crankshaft are controlled in such a manner that the connection between the second intake channel and the at least one transfer channel during the upward stroke of said piston is performed before the connection between said first intake channel opening and said crankcase interior;
• and,
• a metering device for supplying fuel, said metering device being configured to supply to said first flow path an entire quantity of fuel to be supplied to the two-stroke engine downstream of said throttle element.

A two-stroke engine comprising:

• a cylinder having a combustion chamber formed therein;
• a piston configured to be guided in a reciprocating manner in said cylinder;
• said combustion chamber being delimited by said piston;
• a crankcase defining a crankcase interior;
• a crankshaft rotatably mounted in said crankcase;
• said piston being configured to drive said crankshaft;
• a first intake channel which opens into said crankcase interior via a first intake channel opening;
• said first intake channel and said crankcase interior forming a first flow path;
• a first throttle element arranged in said first intake channel;
• said combustion chamber having an outlet opening;
• said cylinder having a cylinder bore;
• at least one transfer channel opening via a transfer window at said cylinder bore and opening into the crankcase interior via a passage opening;
• said at least one transfer channel being configured to establish a fluidic connection between said crankcase interior and said combustion chamber in a region of bottom dead center of said piston;
• a second intake channel configured to supply scavenging air to said at least one transfer channel;
• a second throttle element arranged in said at least one second intake channel;
• said first intake channel and said second intake channel being formed separate from each other;
• wherein a connection between said second intake channel and said at least one transfer channel and a connection between said first intake channel opening and said crankcase interior are controlled as a function of a rotary position of said crankshaft;
• and,
• an injection valve for supplying fuel, said injection valve being configured to supply an entire quantity of fuel to be supplied to the two-stroke engine to said first flow path.

A two-stroke engine comprising:

• a cylinder having a combustion chamber formed therein;
• a piston configured to be guided in a reciprocating manner in said cylinder;
• said combustion chamber being delimited by said piston;
• a crankcase defining a crankcase interior;
• a crankshaft rotatably mounted in said crankcase;
• said piston being configured to drive said crankshaft;
• a first intake channel which opens into said crankcase interior via a first intake channel opening;
• said first intake channel and said crankcase interior forming a first flow path;
• said combustion chamber having an outlet opening;
• said cylinder having a cylinder bore;
• at least one transfer channel opening via a transfer window at said cylinder bore and opening into the crankcase interior via a passage opening;
• said at least one transfer channel being configured to establish a fluidic connection between said crankcase interior and said combustion chamber in a region of bottom dead center of said piston;
• a second intake channel configured to supply scavenging air to said at least one transfer channel;
• a common throttle element configured to control said first intake channel and said second intake channel;
• said common throttle element being pivotably mounted via a throttle shaft;
• said first intake channel and said second intake channel being separate from each other at least downstream of said throttle shaft;
• wherein a connection between said second intake channel and said at least one transfer channel and a connection between said first intake channel opening and said crankcase interior are controlled as a function of the rotary position of the crankshaft;
• and,
• an injection valve for supplying fuel, said injection valve being configured to supply to the first flow path an entire quantity of fuel to be supplied to the two-stroke engine.