	US 12,215,645 B2
	Real-time determination of a fresh-air mass in a cylinder
Sebastian Grasreiner, Miesbach (DE)
Assigned to Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Appl. No. 18/269,485
Filed by Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
PCT Filed Jan. 12, 2022, PCT No. PCT/EP2022/050534 § 371(c)(1), (2) Date Jun. 23, 2023, PCT Pub. No. WO2022/161769, PCT Pub. Date Aug. 4, 2022.
Claims priority of application No. 10 2021 102 030.1 (DE), filed on Jan. 29, 2021.
Prior Publication US 2024/0084755 A1, Mar. 14, 2024
Int. Cl. F02D 41/18 (2006.01); F02D 41/14 (2006.01)

CPC F02D 41/18 (2013.01) [F02D 41/1497 (2013.01); F02D 2250/14 (2013.01)]

16 Claims

1. A method for determining a fresh-air mass parameter in a cylinder of an internal combustion engine in a motor vehicle, the method comprising:

identifying a cylinder which is at an end of an intake stroke or at a beginning of a compression stroke during driving operation of the motor vehicle;

determining a diagnosis time window which lasts for a period of time after closing inlet valves of the identified cylinder within a low-torque range of the internal combustion engine;

determining at least two values of a crankshaft speed of the internal combustion engine during the diagnosis time window;

determining a cylinder load parameter in the identified cylinder in dependence on the determined at least two values of the crankshaft speed;

determining the fresh-air mass parameter in the identified cylinder in dependence on the determined cylinder load parameter; and

controlling a fuel injection quantity for a subsequent operating cycle of the cylinder or a subsequently firing cylinder based on the fresh-air mass parameter in the identified cylinder.