Abstract: Disclosed is an internal combustion engine including: an actuator for axial displacement of at least one gas exchange valve of the internal combustion engine, wherein the actuator includes: an actuator piston disc, a cylinder volume adapted for the actuator piston disc, wherein the actuator piston disc is movably arranged in an axial direction between a rest position and an active position, wherein the position sensor arrangement is configured for determining the position of the at least one gas exchange valve, the at least one gas exchange valve being displaced by the movement of the actuator piston disc, and a local control unit associated with the actuator, wherein the local control unit is operatively connected to the at least one controllable inlet valve and the controllable outlet valve of the actuator and operatively connected to the position sensor arrangement.

Abstract: An internal combustion engine includes combustion chambers, each having a first intake port, and first and second exhaust ports. An intake manifold is connected to the first intake port of each combustion chamber, a main pressure booster upstream of the intake manifold. An exhaust discharge arrangement includes a main exhaust manifold connected to the first exhaust port of each combustion chamber, the exhaust discharge arrangement connected to the second exhaust port of a first subset combustion chambers, and an exhaust recirculation manifold connected to the second exhaust port of a second subset combustion chambers and connected to an upstream side of the main pressure booster. The engine operates in high load and low load modes, which vary how the engine evacuates the exhaust gas of the second subset combustion chambers to the exhaust recirculation manifold. A related method is also disclosed.

Abstract: An internal combustion engine includes combustion chambers, each having a controllable intake valve controlling an intake port, a controllable exhaust valve controlling an exhaust port, a piston, and a fuel injector. An intake manifold is connected to the intake port of each chamber. In catalytic converter warm-up mode, each chamber is driven in four-stroke operation including a 720 crank angle degrees cycle, and opens the intake port, starting to open in 90-180 CAD, and fully closes the intake port in 180-270 CAD, opens the exhaust port during the power stroke, starting in 405-495 CAD, opens the intake port during the exhaust stroke, starting in 610-690 CAD, and fully closes the exhaust port during the exhaust stroke in 630-710 CAD. Exhaust gas is forced into the intake manifold by the piston, mixing fuel and exhaust in the intake manifold, and fully closes the intake port in 700 to 720+20 CAD.

Abstract: An internal combustion engine includes combustion chambers, each having a controllable intake valve opening and closing an intake port, a controllable exhaust valve opening and closing an exhaust port, a piston displaceable back and forth in the combustion chamber between a top dead center and a bottom dead center, and a fuel injector. The engine further including an intake manifold connected to the intake port of each combustion chamber. The engine can be operated in a low load mode, wherein each combustion chamber is driven in four-stroke operation including a 720 crank angle degrees cycle, and opens the intake port during the exhaust stroke, the intake port starting to open in 610-690 CAD, closing the exhaust port during the exhaust stroke, becoming fully closed in 630-710 CAD, forcing exhaust gas into the intake manifold by the piston, and mixing fuel and exhaust gas in the intake manifold.

Abstract: A multi-way valve includes a control pressure channel, first and second control fluid channels, a valve body in the first and second control fluid channels, and an electrically controlled device having a drive member and an armature. The armature moves back and forth by the drive member between inactive and active positions. Movement of the armature from the inactive to the active position displaces the valve body arrangement to an active position, closing the first and opening the second control fluid channel is open. The electrically controlled device includes a drive body connected to the armature and a first spring member between the armature and the drive body. The valve body arrangement is biased towards the inactive position by a second spring member. The armature in the inactive position is biased towards the active position by a third spring member. Also disclosed is an actuator including the valve.

Abstract: Disclosed is an actuator for axial displacement of an object, including a cylinder volume having a first portion, and an actuator piston disc displaceable in the axial direction in the cylinder volume between inactive and active positions, an inlet channel between a pressure fluid inlet and the first portion of the cylinder volume, a first inlet valve body in the inlet channel, an outlet channel between the first portion of the cylinder volume and a pressure fluid outlet, and an outlet valve body in the outlet channel. The slave piston is displaceable in a bore, the slave piston displacing the first inlet valve body to an active position, and interacting with an opening connecting the bore and a control pressure channel, the opening having a first flow area with the slave piston in its inactive position and a larger second flow area with the slave piston in its active position.

Abstract: Disclosed is an actuator including a cylinder volume having a first portion, and an actuator piston disc displaceable in the cylinder between inactive and active positions, an inlet channel between a pressure fluid inlet and the first portion of the cylinder volume, a first inlet valve body in the inlet channel, an outlet channel between the first portion of the cylinder volume and a pressure fluid outlet, and an outlet valve body in the outlet channel. The slave piston is displaceable in a bore between inactive and active positions. The first inlet valve body includes a seat valve body having an inactive position closing the inlet channel, the slave piston, in moving from inactive to active positions, rams the first inlet valve body, displacing it to an active position at which the inlet channel is open, the outlet valve body being connected to and jointly displaceable with the slave piston.

Abstract: Disclosed is a multi-way valve including a control pressure channel, a first control fluid channel between a first opening and the control pressure channel, a second control fluid channel between a second opening and the control pressure channel, a valve body in the first and second control fluid channels, and an electrically controlled device having a drive member and an armature. The armature moves axially according to the drive member between inactive and active positions. Movement of the armature from inactive to active displaces the valve body arrangement to an active position where the first control fluid channel is closed and the second control fluid channel is open. The device further includes a drive body connected to the armature and a spring between the armature and drive body. The drive body abuts the valve body and the spring in a compressed state when the armature is in active position.

Abstract: An actuator for axial displacement of a gas exchange valve of a combustion engine is configured to be connected to a pressure fluid source and a pressure fluid sink, respectively, and to be driven by a gaseous pressure fluid and includes an actuator piston including an actuator piston disc and an actuator piston rod projecting therefrom in the axial direction, a cylinder volume, the disc separating the cylinder volume into a first part and a second part and being displaceable back and forth in the axial direction in the cylinder volume between an inactive position and an active position, the first part being configured for controllable fluid communication with the pressure fluid source and the pressure fluid sink, respectively, and a hydraulic circuit includes a chamber, the free end of the rod being arranged therein, wherein the rod is displaceable back and forth in the axial direction in a channel.

Abstract: Disclosed is a combustion engine and method for engine braking therein including an intake air channel having a first pressure, a first inlet valve between the intake air channel and the cylinder volume, an exhaust air channel having a second pressure, a first outlet valve between the cylinder volume and the exhaust air channel, and a storage reservoir having a third pressure higher than the first and second pressures, the storage reservoir being arranged in controllable fluid communication with the cylinder volume. The method takes place during two-stroke cycle and includes: displacing the piston from upper dead center (UDC) towards lower dead center (LDC), keeping the first inlet valve open during at least part of the travel from UDC to LDC, displacing the piston from LDC towards UDC, and keeping the fluid communication between the storage reservoir and cylinder volume open during at least a part of such travel.

Abstract: A combustion engine includes an engine valve arranged to selectively open/close a combustion chamber of the engine, a cylinder head adjacent the combustion chamber, arranged to guide a valve stem of the engine valve, the engine valve being axially displaceable relative to the cylinder head between the combustion chamber closed position and the combustion chamber fully opened position, and a valve spring retainer connected to the valve stem. The valve spring retainer partly delimits a gas spring volume, which is in fluid communication with an adjacent gas volume via a port when the engine valve is in the combustion chamber closed position, and which is separated from the adjacent gas volume when the engine valve is in the combustion chamber fully open position, the port being open during at least 25% of the maximal stroke of the engine valve and being closed due to a displacement of the engine valve.

Abstract: A combustion engine includes, a cylinder head including a controllable first engine valve arranged to selectively open/close a combustion chamber included in the combustion engine, a first valve actuator operatively connected to the first engine valve, which first valve actuator includes at least one inlet opening for pressure fluid and at least one outlet opening for pressure fluid, and a closed pressure fluid circuit, wherein the first valve actuator is arranged in the closed pressure fluid circuit. The combustion engine further includes a cylinder head chamber that forms part of the closed pressure fluid circuit and that is delimited by the cylinder head and at least a first cylinder head mantle, wherein the at least one outlet opening of the first valve actuator is in fluid communication with the cylinder head chamber. A mantle assembly for a cylinder head of a combustion engine is also described.

Abstract: A combustion engine includes, a first controllable engine valve (8) arranged to selectively open/close a combustion chamber (7) included in the combustion engine (1), and a gas handling system arranged to drive the first engine valve (8), which gas handling system includes a closed pneumatic pressure fluid circuit, wherein the closed pressure fluid circuit includes, coupled in series with each other, a compressor (31) and a valve actuator (10) that are operatively connected to the first engine valve (8). The combustion engine is characterized by the gas handling system further including a gas accumulator (38) that is connected with the closed pressure fluid circuit via at least one gas accumulator conduit (39), which includes a controllable valve (40). A gas handling system for pneumatic control of a valve actuator is also described.

Abstract: A combustion engine includes a cylinder head including a controllable engine valve configured to open/close a combustion chamber in the combustion engine, a valve actuator operatively connected with and configured to displace the engine valve, and a closed pressure fluid circuit, wherein the valve actuator is arranged in the closed pressure fluid circuit. The combustion engine includes a cylinder head chamber that is included in the closed pressure fluid circuit and that is delimited by the cylinder head and a cylinder head mantle, by the valve actuator including a pneumatic pressure fluid circuit with an outlet opening that is in fluid communication with the cylinder head chamber, and by the cylinder head chamber including a hydraulic liquid drainage valve, wherein a drainage conduit stretches from the hydraulic liquid drainage valve to a hydraulic liquid vessel of the combustion engine for draining hydraulic liquid accumulated in the cylinder head chamber.

Abstract: An actuator for axial displacement of an object, includes an actuator piston and an actuator piston rod, wherein the piston is displaceable in the axial direction, and a hydraulic circuit including a liquid filled chamber, a first end of the actuator piston rod being displaceable in the axial direction within the liquid filled chamber, wherein an axially extending recess mouth in the liquid filled chamber is arranged to receive the first end. The actuator piston rod in the area of the first end presents a cylindrical envelope surface, and the recess presents a cylindrical inner surface having a matching shape, wherein the actuator includes a passage extending between the recess and liquid filled chamber when the cylindrical envelope surface and the cylindrical inner surface are located in overlapping configuration, wherein the passage presents at a braking overlap section a cross section area that decreases as a function of increasing overlap.

Abstract: Disclosed is an actuator for axial displacement of an object, including an actuator piston disc displaceable in a cylinder volume, an inlet channel, a first inlet valve body arranged in the inlet channel, a second inlet valve body operatively connected to the actuator piston disc and arranged in the inlet channel, an outlet channel and an outlet valve body arranged therein. The actuator includes an electrically controlled pilot valve communicating a first control pressure to the first inlet valve body via a first control pressure channel and communicating a second control pressure to the outlet valve body via a second control pressure channel. The pilot valve places itself in either a resting state or an active state.

Abstract: A method and position sensor assembly for determining a mutual position between a first object and a second object. The position sensor assembly includes a first body, a coil, a control unit, and a sensor circuit, the first body being reciprocally displaceable in the axial direction in relation to the coil. The sensor circuit includes in turn a comparator connected to a first branch including the coil, a power switch, and a measuring resistance coupled in series with each other.

Abstract: A combustion engine includes, a first controllable engine valve (8) arranged to selectively open/close a combustion chamber (7) included in the combustion engine (1), and a gas handling system arranged to drive the first engine valve (8), which gas handling system includes a closed pneumatic pressure fluid circuit, wherein the closed pressure fluid circuit includes, coupled in series with each other, a compressor (31) and a valve actuator (10) that are operatively connected to the first engine valve (8). The combustion engine is characterized by the gas handling system further including a gas accumulator (38) that is connected with the closed pressure fluid circuit via at least one gas accumulator conduit (39), which includes a controllable valve (40). A gas handling system for pneumatic control of a valve actuator is also described.

Abstract: A combustion engine includes, a cylinder head including a controllable first engine valve arranged to selectively open/close a combustion chamber included in the combustion engine, a first valve actuator operatively connected to the first engine valve, which first valve actuator includes at least one inlet opening for pressure fluid and at least one outlet opening for pressure fluid, and a closed pressure fluid circuit, wherein the first valve actuator is arranged in the closed pressure fluid circuit. The combustion engine further includes a cylinder head chamber that forms part of the closed pressure fluid circuit and that is delimited by the cylinder head and at least a first cylinder head mantle, wherein the at least one outlet opening of the first valve actuator is in fluid communication with the cylinder head chamber. A mantle assembly for a cylinder head of a combustion engine is also described.

Abstract: An actuator, including a cylinder, an actuator piston displacably arranged in the cylinder, a pressure fluid circuit having a channel mouthing in the cylinder, an indirectly electrically controlled first valve body, arranged in the channel for controlling a flow of a pressure fluid in the channel, and a second valve body, arranged in or at the channel to open and close the channel, the second valve body being a member fixedly connected to the actuator piston, and the first valve body and the second valve body being arranged in series with each other in the channel. The actuator further includes an electrically controlled three-way valve that is arranged to alternately open for a pressure fluid flow from a high pressure source and a pressure fluid flow from a low pressure source, chosen pressure fluid flow being arranged to act against and admit displacement of the first valve body.