Vibration Reduction in Internal Combustion Engine
AssigneeScania CV AB
InventorsHåkan Sarby, Andreas Dahl, Ola Jönsson, Fredrik Birgersson, Marcus Ahlin
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Abstract
The disclosure concerns a method for vibration reduction in a compression ignition four- stroke internal combustion engine. The internal combustion engine comprises exhaust and intake valves controlled by exhaust and intake camshafts. The method comprises, when operating the internal combustion engine below a threshold rotational speed, steps of: changing a timing of the exhaust camshaft to advance closing of the exhaust valve, and - changing a timing of the intake camshaft to delay opening of the intake valve.
Claims19
A method for vibration reduction in a compression ignition four-stroke internal combustion engine, the internal combustion engine comprising:
- an exhaust valve and an intake valve,
- an exhaust camshaft arranged to control the opening and closing of the exhaust valve, and
- an intake camshaft arranged to control the opening and closing of the intake valve, wherein the method comprises, when operating the internal combustion engine below a threshold rotational speed, steps of:
- changing a timing of the exhaust camshaft to advance closing of the exhaust valve, and
- changing a timing of the intake camshaft to delay opening of the intake valve.
A control arrangement for controlling a variable valve timing of a compression ignition four-stroke internal combustion engine, the internal combustion engine comprising:
- an exhaust valve and an intake valve,
- an exhaust camshaft arranged to control the opening and closing of the exhaust valve, and
- an intake camshaft arranged to control the opening and closing of the intake valve,
- wherein the control arrangement is configured to, when operating the internal combustion engine below a threshold rotational speed:
- change a timing of the exhaust camshaft to advance closing of the exhaust valve, and
- change a timing of the intake camshaft to delay opening of the intake valve .
The computer-readable storage medium of claim 19, comprising instructions which, when executed by the computer, cause the computer to carry out the steps of the method according to claim 8.
Dependencies are inferred from the claim text.