A compression ignited combustion engine has at least one cylinder and first and second gas intake ports in a cylinder head restricting a combustion chamber. One gas intake passage leads to the two ports and is widened in a Y-shaped end influencing gas entering each port into a tangential flow in opposite direction with respect to the flow into the other port. The first intake port is designed to allow gas entering this port to continue said tangential flow so as to enter the combustion chamber in a swirl in a first rotation direction, whereas the second intake port is designed to guide gas entering this port to also enter the combustion chamber in a swirl in said first rotation direction.

An intake device of an internal combustion engine includes a partition, a control valve, and a third passage. The partition divides an interior of an intake pipe that couples with a combustion chamber into a first passage and a second passage. The control valve is capable of opening and closing the first passage. The third passage opens at or near a coupling site between the partition and the intake pipe on an inner face of the second passage. The third passage is configured to be capable of sucking in at least a part of a boundary layer produced at or near the coupling site by a vapor flowing through the second passage in a state in which the control valve is working in a direction of closing the first passage.

An intake device of an internal combustion engine includes a partition, a control valve, and a third passage. The partition divides an interior of an intake pipe that couples with a combustion chamber into a first passage and a second passage. The control valve is capable of opening and closing the first passage. The third passage opens at or near a coupling site between the partition and the intake pipe on an inner face of the second passage. The third passage is configured to be capable of sucking in at least a part of a boundary layer produced at or near the coupling site by a vapor flowing through the second passage in a state in which the control valve is working in a direction of closing the first passage.

An apparatus (201) and method for controlling intake valves (23) in an internal combustion engine (5), as well as an internal combustion engine and a vehicle comprising the apparatus, and an electronic processor for performing the method is disclosed. The apparatus comprises a hydraulic system (3) configured to hydraulically actuate a first intake valve (23a) and a second intake valve (23b) of a first combustion chamber (25) of an internal combustion engine (5). The apparatus also includes a controller (9) configured to control the hydraulic system (3) in at least a first mode of operation and a second mode of operation. In the first mode of operation, the controller (9) is configured to control the hydraulic system (3) to cause lifting of the first and second intake valves (23a, 23b) of the first combustion chamber (25) during each intake stroke of a respective cylinder piston (27). In the second mode of operation, the controller (9) is configured to control the hydraulic system (3) to cause lifting of the first intake valve (23a) of the first combustion chamber (25) during an intake stroke of the respective cylinder piston (27) and disable actuation of the second intake valve (23b) of the first combustion chamber (25) during that intake stroke.

An apparatus (201) and method for controlling intake valves (23) in an internal combustion engine (5), as well as an internal combustion engine and a vehicle comprising the apparatus, and an electronic processor for performing the method is disclosed. The apparatus comprises a hydraulic system (3) configured to hydraulically actuate a first intake valve (23a) and a second intake valve (23b) of a first combustion chamber (25) of an internal combustion engine (5). The apparatus also includes a controller (9) configured to control the hydraulic system (3) in at least a first mode of operation and a second mode of operation. In the first mode of operation, the controller (9) is configured to control the hydraulic system (3) to cause lifting of the first and second intake valves (23a, 23b) of the first combustion chamber (25) during each intake stroke of a respective cylinder piston (27). In the second mode of operation, the controller (9) is configured to control the hydraulic system (3) to cause lifting of the first intake valve (23a) of the first combustion chamber (25) during an intake stroke of the respective cylinder piston (27) and disable actuation of the second intake valve (23b) of the first combustion chamber (25) during that intake stroke.

An intake device for an internal combustion engine, the intake device includes: a housing constituting an intake passage; a valve element including a valve portion arranged to open and close a part of the intake passage, and thereby to strengthen an intake air flow; and a receiving portion which is formed on a bottom wall of an aeration passage of the housing, and which is recessed in an arc shape along a movement trajectory of the valve portion, the valve portion including an outer side surface which confronts a bottom surface of the receiving portion, which has an arc shape, and which includes a seal portion that has a raised shape, and that extends along an edge portion on an upstream side of an intake direction.

An intake device for an internal combustion engine, the intake device includes: a housing constituting an intake passage; a valve element including a valve portion arranged to open and close a part of the intake passage, and thereby to strengthen an intake air flow; and a receiving portion which is formed on a bottom wall of an aeration passage of the housing, and which is recessed in an arc shape along a movement trajectory of the valve portion, the valve portion including an outer side surface which confronts a bottom surface of the receiving portion, which has an arc shape, and which includes a seal portion that has a raised shape, and that extends along an edge portion on an upstream side of an intake direction.

An engine includes a cylinder block, a cylinder head, and a piston. The cylinder head is connected to the cylinder block. The piston is movably connected to the cylinder block. The cylinder block, the cylinder head, and the piston form a combustion chamber. The cylinder head includes an intake valve hole and an exhaust valve hole. An intake valve is disposed at the intake valve hole and an exhaust valve is disposed at the exhaust valve hole. A barrier protrusion is protruded at the edge of the intake valve hole away from the exhaust valve hole. The included angle between a first connecting line connecting a first end of the barrier protrusion and a center of the intake valve hole and a second connecting line connecting a second end of the barrier protrusion and the center of the intake valve hole is greater than 120 degrees and less than or equal to 180 degrees.

An internal combustion engine comprising: an intake opening; an exhaust opening; and a mask part having a wall surface extending toward the inside of the combustion chamber along an outer periphery of the intake opening at an opposite side from the exhaust opening side. The wall surface of the mask part is formed so that a clearance from a passage surface of an edge part of the intake valve at an edge part at the lift direction side is greater than the clearance at the edge part at the opposite lift direction side, and so that between the edge part at the lift direction side and the edge part at the opposite lift direction side, the clearance is a value between the clearance at the edge part at the lift direction side and the clearance at the edge part at the opposite lift direction side.

An internal combustion engine comprising: an intake opening; an exhaust opening; and a mask part having a wall surface extending toward the inside of the combustion chamber along an outer periphery of the intake opening at an opposite side from the exhaust opening side. The wall surface of the mask part is formed so that a clearance from a passage surface of an edge part of the intake valve at an edge part at the lift direction side is greater than the clearance at the edge part at the opposite lift direction side, and so that between the edge part at the lift direction side and the edge part at the opposite lift direction side, the clearance is a value between the clearance at the edge part at the lift direction side and the clearance at the edge part at the opposite lift direction side.