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US 10,837,323 B2Granted
Four-stroke internal combustion engine thereto related vehicle and method
AssigneeScania CV AB
InventorsAndreas Dahl, Eric Olofsson
Life of this patent
Estimating the term…
Abstract
A four-stroke internal combustion engine is disclosed. A camshaft and a crankshaft if the engine are synchronized 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 the motion of the exhaust valve head and for controlling the second linkage arrangement to selectively prevent the motion of the intake valve head.
Claims14
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, a connecting rod connecting the piston to the crankshaft;
- an exhaust arrangement comprising an exhaust valve, an exhaust opening, and an exhaust valve head configured to seal against an exhaust valve seat of the exhaust opening;
- an intake arrangement comprising 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 first motion of the exhaust valve head, so as to open and close the exhaust opening, via a first linkage arrangement;
- a second lobe configured to cause a first motion of the intake valve head, so as to open and close the intake opening, via a second linkage arrangement, wherein the at least one camshaft is synchronized with the crankshaft to rotate at a same rotational speed as the crankshaft;
- a third lobe configured to cause a second motion of the exhaust valve head, so as to open and close the exhaust opening, via the first linkage arrangement;
- and
- a fourth lobe configured to cause a second motion of the intake valve head, so as to open and close the intake opening, via the second linkage arrangement,
- wherein the piston performs a four stroke operation in the cylinder bore, corresponding to an intake stroke, a compression stroke, a power stroke, and an exhaust stroke,
- wherein the first linkage arrangement is configured to change the first and second motions of the exhaust valve head by selectively switching between an activated lift and a deactivated lift of the exhaust valve head,
- wherein the second linkage arrangement is configured to change the first and second motions of the intake valve head by selectively switching between an activated lift and a deactivated lift of the intake valve head;
- and
- wherein the first linkage arrangement and the second linkage arrangement are controlled by a control unit.
13 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 a cylinder bore, a piston arranged to reciprocate in the cylinder bore, a connecting rod connecting the piston to the crankshaft;
- an exhaust arrangement comprising 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 comprising 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 first motion of the exhaust valve head, so as to open and close the exhaust opening, via a first linkage arrangement,
- a second lobe configured to cause a first motion of the intake valve head, so as to open and close the intake opening, via a second linkage arrangement;
- a third lobe configured to cause a second motion of the exhaust valve head, so as to open and close the exhaust opening, via the first linkage arrangement;
- and
- a fourth lobe configured to cause a second motion of the intake valve head, so as to open and close the intake opening, via the second linkage arrangement,
- wherein the piston performs a four stroke operation in the cylinder bore, corresponding to an intake stroke, a compression stroke, a power stroke, and an exhaust stroke, the method comprising:
- rotating the at least one camshaft at a same rotational speed as the crankshaft;
- changing the first and second motions of the exhaust valve head by selectively switching the first linkage arrangement between an activated lift and a deactivated lift of the exhaust valve head;
- changing the first and second motions of the intake valve head by selectively switching the second linkage arrangement between an activated lift and a deactivated lift of the intake valve head;
- wherein the at least one cylinder arrangement is configured to drive the crankshaft in a four-stroke engine running mode only and the first linkage arrangement is switched to the deactivated lift of the exhaust valve head at every alternate rotation of the at least one camshaft such that the exhaust opening remains closed during the compression stroke, and
- wherein the second linkage arrangement is switched to the deactivated lift of the intake valve head at every alternate rotation of the at least one camshaft such that the intake opening remains closed during the power stroke.
14 more elements
Dependencies are inferred from the claim text.