US 12,215,638 B2
Vibration reduction in internal combustion engine
Håkan Sarby, Huddinge (SE); Andreas Dahl, Nyköping (SE); Ola Jönsson, Huddinge (SE); Fredrik Birgersson, Stockholm (SE); and Marcus Ahlin, Strängnäs (SE)
Assigned to Scania CV AB, Södertälje (SE)
Appl. No. 18/002,518
Filed by Scania CV AB, Södertälje (SE)
PCT Filed Jun. 11, 2021, PCT No. PCT/SE2021/050561
§ 371(c)(1), (2) Date Dec. 20, 2022,
PCT Pub. No. WO2021/262065, PCT Pub. Date Dec. 30, 2021.
Claims priority of application No. 2050750-5 (SE), filed on Jun. 24, 2020.
Prior Publication US 2023/0265802 A1, Aug. 24, 2023
Int. Cl. F02D 13/02 (2006.01); F02B 1/14 (2006.01); F02B 75/02 (2006.01)
CPC F02D 13/0215 (2013.01) [F02B 1/14 (2013.01); F02B 75/02 (2013.01); F02B 2075/027 (2013.01); F02D 2200/101 (2013.01); F02D 2250/28 (2013.01)] 18 Claims
OG exemplary drawing
 
1. 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.