Provided is an actuator for a link mechanism for an internal combustion engine, which is capable of improving a degree of freedom in layout while reducing the number of components. The actuator for a link mechanism for an internal combustion engine according to the present invention includes a rolling bearing provided between a wave generator of a wave gear speed reducer and a housing or a motor housing. An inner ring of the rolling bearing is fixed to the wave generator. A restricting portion configured to restrict movement of an outer ring of the rolling bearing to both sides in an axial direction with respect to the housing or the motor housing is provided.

A switch valve for controlling a hydraulic fluid flow, the switch valve comprising a tapping element that is arranged in a valve housing, wherein the tapping element is displaceable into a first switching position or a second switching position and interlockable by a spring loaded interlocking element in the first switching position or the second switching position, wherein a first hydraulic connection is connected with a relief connection in the first switching position and a second hydraulic connection is connected with the relief connection in the second switching position, wherein a switching travel of the tapping element is limited, wherein the interlocking element is at least partially arranged in a recess of the tapping element, wherein the valve housing includes a first groove that is oriented in an axial direction of the valve housing and limited in the axial direction.

An otto-cycle engine is disclosed. The engine of the present disclosure consumes less work than a traditional engine for the following reasons: (1) the engine adopts constant volume exhaust and reduces the work consumed by forced exhaust and (2) in an intake stroke, the piston has a short stay at the top dead center and an intake valve has enough time to open to the maximum, thereby reducing negative pressure and reducing the work consumed by intake. By adopting otto-cycle technology, heat efficiency of the engine can be increased by more than 50%. And meanwhile, by adopting constant volume exhaust technology, power loss can be reduced, vibration of the engine can also be greatly reduced and an effect of a boxer engine is achieved.

A hybrid vehicle includes an internal combustion engine and a motor generator, wherein the internal combustion engine includes a variable compression ratio mechanism structured to vary in mechanical compression ratio depending on variation in position of a compression ratio control member structured to move due to driving of an electric actuator. A control method for the hybrid vehicle includes: measuring a state of charge of a battery connected to the motor generator; and in response to regenerative operation of the motor generator in a state that the state of charge of the battery is equal to or higher than a predetermined level, consuming generated electric power by driving the electric actuator of the variable compression ratio mechanism.

Disclosed is a procedure to minimize NOx during varying engine loads in a 4-stroke diesel engine including at least one cylinder with a cylinder head, first piston on a connecting rod, one actuator mounted on the cylinder head and one of the actuator operated second piston lockable via a hydraulic circuit in various positions in a combustion chamber. The second piston, at the latest during the current compression stroke is actuated by the actuator and locked in the combustion chamber, where it by the first piston introduced air is compressed in a predetermined compression ratio to meet an existing engine load wherein the free operated inlet valve is brought to close the inlet stroke at a piston position where the volume of the combustion air as introduced at the end of the compression stroke gives the predetermined compression ratio and that the injector injects the stated amount of fuel.

Methods and systems are provided for indicating degradation of a VCR mechanism that mechanically alters a cylinder compression ratio. Degradation is detected based on an elevated knock incidence and increased spark retard usage. If the VCR mechanism is stuck, knock and pre-ignition that could be induced by continued operation in a higher than intended compression ratio is mitigated by limiting the engine load.

The variable compression ratio mechanism 1, 1 comprises: a connecting rod 20 provided with a crank receiving opening 23; an eccentric member 30, 30 provided with a piston pin receiving opening 36 and attached to the connecting rod to be able to turn so as to change a length between a center axial line of the piston pin receiving opening and a center axial line of the crank receiving opening; a swing member 40, 50, 40 attached to the connecting rod to be able to swing and able to engage with the eccentric member; and an actuating member 60, 60 swinging the swing member from an initial position toward a stop position. The swing member engages with the eccentric member to turn the eccentric member when swinging from the initial position toward the stop position, and returns from the stop position to the initial position when disengaged form the eccentric member.

The variable compression ratio mechanism 1, 1 comprises: a connecting rod 20 provided with a crank receiving opening 23; an eccentric member 30, 30 provided with a piston pin receiving opening 36 and attached to the connecting rod to be able to turn so as to change a length between a center axial line of the piston pin receiving opening and a center axial line of the crank receiving opening; a swing member 40, 50, 40 attached to the connecting rod to be able to swing and able to engage with the eccentric member; and an actuating member 60, 60 swinging the swing member from an initial position toward a stop position. The swing member engages with the eccentric member to turn the eccentric member when swinging from the initial position toward the stop position, and returns from the stop position to the initial position when disengaged form the eccentric member.

A check valve for a connecting rod for a variable compression internal combustion engine with at least one hydraulic chamber arranged in the connecting rod and connectable with a supply connection or a tank through the check valve, the check valve including a valve housing; and a valve closure element that is axially movable in the valve housing along a longitudinal valve axis, wherein the valve closure element is applicable to a valve seat and arranged in the valve housing secured against separation from the valve housing, wherein a pin shaped separation prevention element is provided which secures the valve closure element in the valve housing and limits a stroke of the valve closure element.

Provided is an actuator of a link mechanism for an internal combustion engine, in which a speed reducer is sufficiently lubricated. The actuator includes an oil passage formed in a control shaft for changing the posture of a control link and configured to feed lubricant oil to the speed reducer; and an open portion which opens to face the speed reducer in one end side located on the speed reducer side, and which is in communication with the oil passage in the other end side. An inner diameter of the one end side of the open portion is larger than an outer diameter of one end side of the oil passage.