A two-stroke engine (1) is disclosed comprising a cylinder (2), a piston (3) arranged to reciprocate in the cylinder (2), a crankcase (5), a fuel injector (7) configured to inject fuel into the crankcase (5), an air inlet (9) connected to the crankcase (5), and a stratified scavenging intake (11) connected to the cylinder (2). The engine (1) comprises a throttle (13) configured to control the amount of air supplied to the air inlet (9) and to the stratified scavenging intake (11). The present disclosure further relates to handheld power tool (50) comprising an engine (1).

A two-stroke engine (1) is disclosed comprising a cylinder (2), a piston (3) arranged to reciprocate in the cylinder (2), a crankcase (5), a fuel injector (7) configured to inject fuel into the crankcase (5), an air inlet (9) connected to the crankcase (5), and a stratified scavenging intake (11) connected to the cylinder (2). The engine (1) comprises a throttle (13) configured to control the amount of air supplied to the air inlet (9) and to the stratified scavenging intake (11). The present disclosure further relates to handheld power tool (50) comprising an engine (1).

An internal combustion engine (ICE) includes a crankshaft, a cylinder head defining in part a variable combustion chamber of the ICE, a direct fuel injector mounted on the cylinder head, a power source, an electric turning machine (ETM) rotating the crankshaft, an absolute position sensor providing an indication of an angular position of a rotor of the ETM, and an engine control unit (ECU) operatively connected to the absolute position sensor. The ECU controls a delivery of electric power from the power source to the ETM based on the angular position of the rotor of the ETM and causes the direct fuel injector to inject fuel directly in the combustion chamber at a time selected based on the angular position reached by the rotor of the ETM.

A method for controlling delivery of electric power between a power source and an electric turning machine (ETM) comprises applying a start signal to a start-up power electronic switch to cause turning on of the start-up power electronic switch and to allow delivery of electric power from the power source to the ETM via the start-up power electronic switch. A recharge signal is applied to a run-time power electronic switch to cause turning on of the run-time power electronic switch for delivery of electric power from the ETM to the power source via the run-time power electronic switch. A circuit comprises a discharging circuit including the start-up power electronic switch for delivering the electric power when the start-up power electronic switch is turned on. A charging circuit includes the run-time power electronic switch for delivering the electric power when the run-time power electronic switch is turned on.

A two-stroke internal combustion engine includes:—a base;—a head, fixed to the base, and having a cylindrical cavity;—a piston slidable in the cylindrical cavity, to define a combustion chamber and a pumping chamber, and movable in the cylindrical cavity between a bottom and a top dead center;—a transfer duct having an inlet mouth in fluid communication with the pumping chamber, and an outlet mouth in fluid communication with the combustion chamber;—an exhaust duct having an inlet mouth in fluid communication with the combustion chamber,—a crank shaft partially housed in the pumping chamber;—a connecting rod connecting the piston to the crank shaft;—a movable partition housed inside the pumping chamber operatively connected to the crank shaft to occlude the transfer duct inlet mouth and to put in fluid communication the transfer duct inlet mouth with the pumping chamber.

Embodiments describe a method of controlling a two-stroke internal combustion engine. A method of controlling a two-stroke internal combustion engine includes determining a base nominal exhaust gas temperature, determining a base barometric pressure correction to base nominal exhaust gas temperature, determining exhaust gas temperature differential, determining exhaust gas temperature injection correction, and utilizing the exhaust gas temperature injection correction to make a final short-term fuel or ignition correction.

A two-stroke internal combustion engine having at least one cylinder provided with a combustion chamber and an outlet and having a crank housing provided with a crank shaft. The housing is flow-connected to the combustion chamber via at least one transfer port, and the internal combustion engine is formed to inject fuel into the transfer port, against the transfer port from the crank housing into the combustion chamber; the internal combustion engine has at least one cylinder having two injectors, and fuel can be introduced by means of only one injector with a first engine load and by means of the two injectors with a second engine load.

A two-stroke internal combustion engine having at least one cylinder provided with a combustion chamber and an outlet and having a crank housing provided with a crank shaft. The housing is flow-connected to the combustion chamber via at least one transfer port, and the internal combustion engine is formed to inject fuel into the transfer port, against the transfer port from the crank housing into the combustion chamber; the internal combustion engine has at least one cylinder having two injectors, and fuel can be introduced by means of only one injector with a first engine load and by means of the two injectors with a second engine load.

Disclosed is a piston ported two-stroke compression ignition internal combustion engine comprising: a cylinder having a fixed closed end, and a piston for reciprocation within the cylinder, wherein the closed end of the cylinder and the piston together define a combustion chamber therebetween; at least one heater to heat the combustion chamber; and a controller to control the heater to heat the combustion chamber when the controller determines that a temperature of the combustion chamber has fallen below a threshold temperature during reciprocation of the piston within the cylinder.

Disclosed is a piston ported two-stroke compression ignition internal combustion engine comprising: a cylinder having a fixed closed end, and a piston for reciprocation within the cylinder, wherein the closed end of the cylinder and the piston together define a combustion chamber therebetween; at least one heater to heat the combustion chamber; and a controller to control the heater to heat the combustion chamber when the controller determines that a temperature of the combustion chamber has fallen below a threshold temperature during reciprocation of the piston within the cylinder.