US 12,140,104 B2
Method for operating a fuel injection system for supplying a combustion engine with fuel, and electronic control unit
Antonio De Benedictis, Ugento (IT); Antonio Diaferia, Corato (IT); Bernd Frey, Rutesheim (DE); Bjoern Noack, Rutesheim (DE); Charlotte Summerer, Stuttgart (DE); Christos Hondros, Ludwigsburg (DE); Ciro Medolla, Molfetta (IT); Daniel Zander, Oberriexingen (DE); John Kuesters, Vreden (DE); Michael Hackner, Winterbach (DE); and Nello Medoro, Trinitapoli (IT)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 18/548,836
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Feb. 8, 2022, PCT No. PCT/EP2022/052992
§ 371(c)(1), (2) Date Sep. 1, 2023,
PCT Pub. No. WO2022/184386, PCT Pub. Date Sep. 9, 2022.
Claims priority of application No. 10 2021 202 096 (DE), filed on Mar. 4, 2021.
Prior Publication US 2024/0151191 A1, May 9, 2024
Int. Cl. F02D 41/38 (2006.01)
CPC F02D 41/3845 (2013.01) [F02D 2041/389 (2013.01); F02D 2200/0602 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for operating a fuel injection system (1) for supplying a combustion engine of a vehicle with fuel, in which method the fuel is conveyed at high pressure with the aid of a high-pressure pump (2), fed to a high-pressure accumulator (3), and injected into a cylinder of the combustion engine with the aid of at least one injector (4) connected to the high-pressure accumulator (3),
wherein, to detect any damage to the drive of the high-pressure pump (2),
a) the pressure (P) in the high-pressure accumulator (3) is measured and, based on the measured values, a pressure drop (ΔP) in the high-pressure accumulator (3) caused by an injection into a cylinder is determined,
b) a maximum pressure gradient is determined during a pressure build-up phase following the injection,
c) the determined pressure drop (ΔP) and the determined maximum pressure gradient are put into proportion, and
damage to the drive of the high-pressure pump (2) is detected during an injection cycle when the determined maximum pressure gradient changes and the determined pressure drop (ΔP) remains unchanged.