Method for diagnosing a clogging of an injector in an internal combustion engine
AssigneeGM Global Technology Operations LLC
InventorAntonio Massaro
Life of this patent
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Abstract
A method is provided for diagnosing a clogging of an injector in an internal combustion engine equipped with a fuel rail and with a plurality of fuel injectors hydraulically connected to the fuel rail. The method includes, but is not limited to determining a value of a pressure drop in the fuel rail due to a quantity of fuel injected by a tested injector, and diagnosing the clogging of the tested injector if the determined pressure drop value is lower than a threshold value of this pressure drop.
Claims20
A method for diagnosing a clogging of an injector in an internal combustion engine equipped with a fuel rail and with a plurality of fuel injectors hydraulically connected to the fuel rail, the method comprising:
- injecting a quantity of fuel by a tested injector;
- determining a value of a pressure drop in the fuel rail due to fuel injection;
- diagnosing the clogging of the tested injector if the value of the pressure drop is lower than a threshold value of the pressure drop;
- and
- determining the value of the pressure drop in the fuel rail for each injector, each value of the pressure drop due to the quantity of fuel injected by a related injector;
- and
- determining the threshold value based at least in part on an average of values of the pressure drop.
A method for diagnosing a clogging of an injector in an internal combustion engine equipped with a fuel rail and with a plurality of fuel injectors hydraulically connected to the fuel rail, the method comprising:
- injecting a quantity of fuel by a tested injector;
- determining a value of a pressure drop in the fuel rail due to fuel injection;
- and
- diagnosing the clogging of the tested injector if the value of the pressure drop is lower than a threshold value of the pressure drop,
- wherein the quantity of fuel injected by each injector is achieved with a plurality of fuel injections performed by the injector, and
- wherein a value of a related pressure drop is determined as a sum of pressure drops due to each of the plurality of fuel injections.
An internal combustion engine, comprising:
- a fuel injection system equipped with a common rail;
- a plurality of fuel injectors configured to receive a fuel quantity from injection lines;
- a pressure sensor configured to measure pressure differences of the common rail;
- and
- an Electronic Control Unit configured to
- inject a quantity of fuel by a tested injector;
- determine a value of a pressure drop in a fuel rail due to fuel injection;
- diagnose the clogging of the tested injector if the value of the pressure drop is lower than a threshold value of the pressure drop;
- determine the value of the pressure drop in the fuel rail for each injector, each value of the pressure drop due to the quantity of fuel injected by a related injector;
- and
- determine the threshold value based at least in part on an average of values of the pressure drop.
A computer readable medium embodying a computer program product, the computer program product, comprising:
- a diagnostic program that is configured to diagnose a clogging of an injector in an internal combustion engine equipped with a fuel rail and with a plurality of fuel injectors hydraulically connected to the fuel rail, the diagnostic program configured to:
- inject a quantity of fuel by a tested injector;
- determine a value of a pressure drop in the fuel rail due to fuel injection;
- diagnose the clogging of the tested injector if the value of the pressure drop is lower than a threshold value of the pressure drop;
- determine the value of the pressure drop in the fuel rail for each injector, each value of the pressure drop due to the quantity of fuel injected by a related injector;
- and
- determine the threshold value based at least in part on an average of values of the pressure drop.
Dependencies are inferred from the claim text.