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US 2020/0049080 A1Published application
Four-stroke internal combustion engine thereto related vehicle and method
AssigneeScania CV AB
InventorsAndreas DAHL, Eric OLOFSSON
Life of this patent
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Abstract
A four-stroke internal combustion engine is disclosed. A camshaft and a crankshaft if the engine are synchronised to rotate at a same rotational speed. A first linkage arrangement is configured to change the motion of an exhaust valve head. A second linkage arrangement is configured to change the motion of the intake valve head. A control unit is configured for controlling the first linkage arrangement to selectively prevent or reduce the motion of the exhaust valve head and for controlling the second linkage arrangement to selectively prevent or reduce the motion of the intake valve head.
Claims20
A four-stroke internal combustion engine comprising:
- a crankshaft;
- a crankshaft;
- at least one cylinder arrangement forming a combustion chamber and comprising:
- a cylinder bore, a piston arranged to reciprocate in the cylinder bore, and a connecting rod connecting the piston with the crankshaft;
- an exhaust arrangement for outflow of exhaust gas from the cylinder bore wherein the exhaust arrangement comprises an exhaust valve and an exhaust opening, the exhaust valve comprising an exhaust valve head configured to seal against an exhaust valve seat of the exhaust opening;
- an intake arrangement for intake of fresh gas into the cylinder bore, wherein the piston performs four strokes in the cylinder bore, corresponding to an intake stroke, a compression stroke, a power stroke, and an exhaust stroke,
- wherein the intake arrangement comprises an intake valve and an intake opening, the intake valve comprising an intake valve head configured to seal against an intake valve seat of the intake opening;
- at last one camshaft comprising:
- a first lobe configured to cause a motion of the exhaust valve head for opening and closing the exhaust opening;
- and
- a second lobe configured to cause a motion of the intake valve head for opening and closing the intake opening
- wherein the at least one camshaft is synchronized with the crankshaft to rotate at a same rotational speed as the crankshaft,
- wherein the exhaust arrangement comprises a first linkage arrangement configured to change a motion of the exhaust valve head caused by the first lobe, and the intake arrangement comprises a second linkage arrangement configured to change a motion of the intake valve head caused by the second lobe;
- and
- a control unit configured for controlling the first linkage arrangement to selectively prevent the motion of the exhaust valve head and configured for controlling the second linkage arrangement to selectively prevent the motion of the intake valve head, and is further configured for controlling the first linkage arrangement to selectively reduce the motion of the exhaust valve head, and/or configured for controlling the second linkage arrangement to selectively reduce the motion of the intake valve head.
12 more elements
A vehicle comprising a four-stroke internal combustion engine comprising:
- a crankshaft;
- at least one cylinder arrangement forming a combustion chamber and comprising:
- a cylinder bore, a piston arranged to reciprocate in the cylinder bore, and a connecting rod connecting the piston with the crankshaft;
- an exhaust arrangement for outflow of exhaust gas from the cylinder bore wherein the exhaust arrangement comprises an exhaust valve and an exhaust opening, the exhaust valve comprising an exhaust valve head configured to seal against an exhaust valve seat of the exhaust opening;
- an intake arrangement for intake of fresh gas into the cylinder bore, wherein the piston performs four strokes in the cylinder bore, corresponding to an intake stroke, a compression stroke, a power stroke, and an exhaust stroke, wherein the intake arrangement comprises an intake valve and an intake opening, the intake valve comprising an intake valve head configured to seal against an intake valve seat of the intake opening;
- at last one camshaft comprising:
- a first lobe configured to cause a motion of the exhaust valve head for opening and closing the exhaust opening;
- and
- a second lobe configured to cause a motion of the intake valve head for opening and closing the intake opening,
- wherein the at least one camshaft is synchronized with the crankshaft to rotate at a same rotational speed as the crankshaft,
- wherein the exhaust arrangement comprises a first linkage arrangement configured to change a motion of the exhaust valve head caused by the first lobe, and the intake arrangement comprises a second linkage arrangement configured to change a motion of the intake valve head caused by the second lobe;
- and
- a control unit configured for controlling the first linkage arrangement to selectively prevent the motion of the exhaust valve head and configured for controlling the second linkage arrangement to selectively prevent the motion of the intake valve head, and is further configured for controlling the first linkage arrangement to selectively reduce the motion of the exhaust valve head, and/or configured for controlling the second linkage arrangement to selectively reduce the motion of the intake valve head.
10 more elements
A method for controlling a four-stroke internal combustion engine, the four-stroke internal combustion engine comprising:
- a crankshaft;
- at least one cylinder arrangement forming a combustion chamber and comprising comprises a cylinder bore, a piston arranged to reciprocate in the cylinder bore, and a connecting rod connecting the piston with the crankshaft;
- an exhaust arrangement for outflow of exhaust gas from the cylinder bore, wherein the exhaust arrangement comprises an exhaust valve and an exhaust opening, the exhaust valve comprising an exhaust valve head configured to seal against an exhaust valve seat of the exhaust opening;
- an intake arrangement for intake of fresh gas into the cylinder bore, wherein the piston performs four strokes in the cylinder bore, corresponding to an intake stroke, a compression stroke, a power stroke, and an exhaust stroke, wherein the intake arrangement comprises an intake valve and an intake opening, the intake valve comprising an intake valve head configured to seal against an intake valve seat of the intake opening;
- and
- at least one camshaft comprising:
- a first lobe configured to cause a motion of the exhaust valve head for opening and closing the exhaust opening, and a second lobe configured to cause a motion of the intake valve head for opening and closing the intake opening,
- and wherein the method comprises:
- rotating the at least one camshaft at a same rotational speed as the crankshaft;
- changing the motion of the exhaust valve head caused by the first lobe by means of a first linkage arrangement comprised in the exhaust arrangement;
- and
- changing the motion of the intake valve head caused by the second lobe by means of a second linkage arrangement comprised in the intake arrangement,
- wherein changing the motion of the exhaust valve head caused by the first lobe comprises:
- selectively preventing the motion of the exhaust valve head caused by the first lobe;
- and
- selectively reducing the motion of the exhaust valve head caused by the first lobe, and
- wherein of changing the motion of the intake valve head caused by the second lobe comprises:
- selectively preventing the motion of the intake valve head caused by the second lobe;
- and
- selectively reducing the motion of the intake valve head caused by the second lobe.
17 more elements
Dependencies are inferred from the claim text.