US 12,234,785 B2
Method and control unit for identifying misfire subjected cylinders of an internal combustion engine
Darshit Shah, Baden-Württemberg (DE)
Assigned to Caterpillar Energy Solutions GmbH, Mannheim (DE)
Appl. No. 18/020,389
Filed by Caterpillar Energy Solutions GmbH, Mannheim (DE)
PCT Filed Aug. 4, 2021, PCT No. PCT/EP2021/025298
§ 371(c)(1), (2) Date Feb. 8, 2023,
PCT Pub. No. WO2022/033719, PCT Pub. Date Feb. 17, 2022.
Claims priority of application No. 2012548 (GB), filed on Aug. 12, 2020.
Prior Publication US 2023/0340921 A1, Oct. 26, 2023
Int. Cl. F02D 41/14 (2006.01); F02D 41/22 (2006.01); G01M 15/11 (2006.01)
CPC F02D 41/1498 (2013.01) [F02D 41/22 (2013.01); G01M 15/11 (2013.01); F02D 2200/1015 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A Method for identifying cylinders of an internal combustion engine which are subjected to misfire during operation, comprising:
a step (S1) of determining whether the engine is subjected to a misfire condition;
a step (S2) of measuring vibrations generated upon operating the engine;
a step of determining a misfire point of time in dependence on at least one of the measured vibrations and an operating signal being indicative of an engine speed or engine power output by the engine;
a step (S3) of determining a set of misfire suspected cylinders in dependence on the misfire point of time and ignition enable pulses, each of which is associated to one cylinder; and
a step (S4) of identifying at least one cylinder subjected to a misfire in dependence on the measured vibrations.