US 12,031,495 B1
System and a method for determining fuel injector leak
Benjamin Seville, Waynesboro, PA (US); and Kyle Hilling, Hedgesville, WV (US)
Assigned to VOLVO TRUCK CORPORATION, Gothenburg (SE)
Filed by Volvo Truck Corporation, Gothenburg (SE)
Filed on Dec. 18, 2023, as Appl. No. 18/542,887.
Claims priority of application No. 22215167 (EP), filed on Dec. 20, 2022.
Int. Cl. F02D 41/22 (2006.01); F02D 41/38 (2006.01)
CPC F02D 41/22 (2013.01) [F02D 41/3836 (2013.01); F02D 2041/225 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A system comprising a fuel injection system and a computer system comprising a processor device,
said fuel injection system comprising:
a fuel rail defining a fuel conduit for transporting fuel,
at least one fuel pump fluidly connected to the fuel rail,
a plurality of fuel injectors, each one of the plurality of fuel injectors being fluidly connected to the fuel rail, and
a proportional-integral-derivative (PID) controller adapted to control the at least one fuel pump based on at least a fuel pressure in the fuel rail,
said processor device being configured to:
with the engine running, control the at least one fuel pump to increase the pressure in the fuel rail to a baseline pressure at which an integral response of the PID controller reaches a predetermined integral response threshold, and
for each respective fuel injector, determine a primary reference integral response associated with the fuel injector by:
fluidly isolating each fuel injector from the fuel rail, with all other fuel injectors fluidly connected to the fuel rail, by controlling a respective valve between the respective fuel injector and the fuel rail,
with the engine running, controlling the at least one fuel pump to increase the pressure in the fuel rail until the pressure in the fuel rail reaches the baseline pressure, and
obtaining the respective primary reference integral response by obtaining the current integral response, thereby providing information indicating the leak rate of each fuel injector.