The present invention concerns a method for electrically controlling a valve actuator in a 2-stroke or 4-stroke engine, where the actuator comprises a first solenoid (A) with a plunger (5) and a second solenoid (B) with a plunger (15), wherein the engine has at least one cylinder (1) with at least one freely controllable engine valve comprising a valve disc (10) with associated valve stem (11) and a valve spring (4) and where air is introduced, or exhaust gases are evacuated from, a combustion chamber (3) past a lower part the valve stem with the valve disc via at least one channel (2) in the cylinder, wherein the valve actuator is activatable to open the engine valve. The invention is characterized in that both the first and second solenoid are activated during opening of the engine valve.

An internal combustion engine includes a hollow cylinder, a piston within the hollow cylinder, and a cylinder head. A base valve assembly at a base of the hollow cylinder permits or restricts fluid flow from an intake manifold into a sub-chamber below the piston. The piston includes at least one intake port connecting a combustion chamber above the piston with the sub-chamber, and a transfer valve that opens and closes the at least one intake port. When the transfer valve opens the at least one intake port, fluid is permitted to flow from the sub-chamber to the combustion chamber. The internal combustion engine operates according to a four-stroke piston cycle, wherein multiple intake stages are provided. The intake stages may include intake of air into the sub-chamber during a compression stroke, transfer of air from the sub-chamber to the combustion chamber during a power stroke, intake of air-fuel mixture into the sub-chamber during an exhaust stroke, and transfer of air-fuel mixture from the sub-chamber to the combustion chamber during an intake stroke.

A mover is attracted and is moved in an axial direction with a predetermined stroke by a magnetic force generated between a stator and the mover when a coil is energized. The stator includes: a first stator positioned at a side where a stroke start position of the mover is located, and a second stator positioned at another side where a stroke end position of the mover is located. The mover includes a tapered portion which has a diameter progressively reduced toward the second stator, and a small-diameter cylindrical portion which is shaped in a straight form and has a constant outer diameter along an entire axial extent of the small-diameter cylindrical portion. An outer wall of the small diameter cylindrical portion has the outer diameter that is equal to an outer diameter of a smallest-diameter part of the tapered portion.

Method of operating an internal combustion engine that applies to both types of ignition types; Spark Ignition (SI) and Compression Ignition (CI). The method comprises opening the intake valve, allowing the fuel and air mixture to flow through the intake valve and into the chamber during at least during a portion of the intake stroke; closing the intake port during a portion of the intake stroke; applying a negative pressure during a portion of the intake stroke; directly or indirectly igniting the fuel and air mixture during a portion of the intake stroke; opening the exhaust valve during the exhaust stroke. The operation of intake valve, the exhaust valve, and the application of the ignition source is performed at any time during the intake and/or exhaust stroke or cycle.

An actuator control system suitable for providing single wire control of electromagnetic latch assemblies providing for cylinder deactivation or variable valve actuation in a valvetrain system. The system is adapted to control electromagnetic latch assemblies that require DC current in a first direction for latching and DC current in a reverse of the first direction for unlatching. The actuator control system includes an inverting DC/DC converter and switching elements. In some embodiments, the inverting DC/DC converter uses capacitors to store energy that drives the inverted current. In some embodiments, the inverting DC/DC converter serves a plurality of distinct groups of the electromagnets.

An actuator control system suitable for providing single wire control of electromagnetic latch assemblies providing for cylinder deactivation or variable valve actuation in a valvetrain system. The system is adapted to control electromagnetic latch assemblies that require DC current in a first direction for latching and DC current in a reverse of the first direction for unlatching. The actuator control system includes an inverting DC/DC converter and switching elements. In some embodiments, the inverting DC/DC converter uses capacitors to store energy that drives the inverted current. In some embodiments, the inverting DC/DC converter serves a plurality of distinct groups of the electromagnets.

An electromagnetic actuator having at least one electromagnetic actuator unit, the actuator unit comprising a coil and a plunger, which plunger is axially movable relative to the coil via energization of the coil, and the actuator unit being arranged in a housing. In order to achieve a particularly simple design, the plunger is arranged approximately coaxially with the coil according to the invention.

An internal combustion engine includes a hollow cylinder, a piston within the hollow cylinder, and a cylinder head. A base valve assembly at a base of the hollow cylinder permits or restricts fluid flow from an intake manifold into a sub-chamber below the piston. The piston includes at least one intake port connecting a combustion chamber above the piston with the sub-chamber, and a transfer valve that opens and closes the at least one intake port. When the transfer valve opens the at least one intake port, fluid is permitted to flow from the sub-chamber to the combustion chamber. The internal combustion engine operates according to a four-stroke piston cycle, wherein multiple intake stages are provided. The intake stages may include intake of air into the sub-chamber during a compression stroke, transfer of air from the sub-chamber to the combustion chamber during a power stroke, intake of air-fuel mixture into the sub-chamber during an exhaust stroke, and transfer of air-fuel mixture from the sub-chamber to the combustion chamber during an intake stroke.

A fuel injection control device includes an additional energization unit. Concerning an undershoot state caused by a first energization for fuel injection, a return period is an estimated period required for a movable core to return to an initial position from a first energization. An injection interval ranges from the first energization to a second energization that is for a next fuel injection. An allowable period is obtained by subtracting a rise period estimated for the second energization from the return period. The additional energization unit adds an additional energization between the first energization and the second energization when the injection interval is longer than or equal to the allowable period and is shorter than or equal to the return period.

Systems, methods, and control systems for a switching rocker arm assembly are disclosed. A switching rocker arm (10) engages a valve (29), the switching rocker arm (10) is movable by contact with a cam (60) having a lift portion (59) and a base circle (58). The switching rocker arm (10) comprises an inner arm (20), an outer arm (12) pivotably secured to the inner arm (20) and having a latch bore, and a latch pin (28) selectively movable between a first position where the latch pin (28) does not contact the inner arm (20), and a second position wherein the latch pin (28) contacts the inner arm (20). A solenoid assembly (500) is energized while the rocker arm is in contact with the lift portion (59) of the cam. The solenoid assembly is direct-acting and overhead and is calibratable with respect to the rocker arm.