System and a method for determining fuel injector leak
AssigneeVolvo Truck Corporation
InventorsBenjamin Seville, Kyle Hilling
Life of this patent
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Abstract
A method of determining fuel leak of fuel injectors of an injection system of a combustion engine, said method including determining a baseline pressure based on a predetermined integral response threshold and for each fuel injector determining a primary reference integral response by obtaining the associated primary reference integral response by obtaining the current integral response while running the engine at the baseline pressure with the respective fuel injector fluidly isolated.
Claims17
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.
A method for determining fuel leak of one or more fuel injectors of a fuel injection system of a combustion engine,
- 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 method comprising:
- with the engine running, controlling 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 determining a primary reference integral response associated with the fuel injector, by:
- with each respective fuel injector fluidly isolated from the fuel rail, with all other fuel injectors fluidly connected to the fuel rail, and
- 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 primary reference integral response associated with the respective isolated fuel injector by obtaining the current integral response, thereby providing information indicating the leak rate of each fuel injector.
Dependencies are inferred from the claim text.