Fuel injector diagnostic system and method for direct injection engine
AssigneeGM Global Technology Operations LLC
InventorsKenneth J. Cinpinski, Byungho Lee, Donovan L. Dibble, Michael J. Lucido, Mark D. Carr
Life of this patent
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Abstract
A fuel injector diagnostic system includes a fuel pump control module, a pressure sensor, and a diagnostic module. The fuel pump control module disables delivery of fuel to a fuel rail of an engine. The pressure sensor measures a first pressure of the fuel rail before an injection event and a second pressure of the fuel rail after the injection event on at least one of a plurality of injectors when the engine is running. The diagnostic module diagnoses a fault in the at least one of the injectors based on the first pressure and the second pressure.
Claims14
A fuel injector diagnostic system comprising:
- a fuel pump control module that disables delivery of fuel to a fuel rail of an engine;
- a pressure sensor that measures a first pressure of the fuel rail before an injection event and a second pressure of the fuel rail after the injection event on at least one of a plurality of injectors when the engine is running;
- and
- a diagnostic module that diagnoses a fault in the at least one of the injectors based on the first pressure and the second pressure.
A method of diagnosing a fuel injection system comprising:
- disabling a fuel pump when an engine is running;
- measuring a fuel rail pressure to obtain a first pressure;
- starting an injection event by injecting fuel through one of a plurality of fuel injectors;
- measuring the fuel rail pressure to obtain a second pressure after the injection event;
- and
- diagnosing a fault in the one of the plurality of fuel injectors based on the first pressure and the second pressure when the engine is in operation.
Dependencies are inferred from the claim text.