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.
Claims18
A method for vibration reduction in a compression ignition four-stroke internal combustion engine of a vehicle, the internal combustion engine comprising:
- an exhaust valve and an intake valve,
- an exhaust camshaft arranged to control opening and closing of the exhaust valve, and
- an intake camshaft arranged to control opening and closing of the intake valve, wherein the method comprises:
- determining a position of the vehicle;
- and
- when operating the internal combustion engine below a threshold rotational speed and in response to the position of the vehicle being determined to be within an area of a particularly defined type, 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 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 opening and closing of the exhaust valve, and
- an intake camshaft arranged to control 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, wherein the method is performed in a vehicle configured for land-based propulsion,
- wherein the vehicle comprises a GPS positioning system, and wherein preceding the steps of changing the timing of the exhaust camshaft and changing the timing of the intake camshaft, the method comprises a step of:
- determining a position of the vehicle, and wherein in response to the position of the vehicle being determined to be within an area of a particularly defined type the steps of changing the timing of the exhaust camshaft and changing the timing of the intake camshaft are performed.
A control arrangement for controlling a variable valve timing of a compression ignition four-stroke internal combustion engine of a vehicle, the internal combustion engine comprising:
- a sensor configured to sense vibrations of the internal combustion engine,
- an exhaust valve and an intake valve,
- an exhaust camshaft arranged to control opening and closing of the exhaust valve, and
- an intake camshaft arranged to control 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 and in response to the vehicle being propelled at a speed below a threshold 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.
Dependencies are inferred from the claim text.