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Methods and systems for common rail fuel system maintenance health diagnostic

  • US 9,512,799 B2
  • Filed: 07/06/2011
  • Issued: 12/06/2016
  • Est. Priority Date: 07/06/2011
  • Status: Active Grant
First Claim
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1. A method for controlling a system having an engine, the method comprising:

  • during a no-load condition of the engine where the engine is rotating,stopping fuel injection by a plurality of fuel injectors of the engine;

    closing a valve that is operable to control fuel flow to a fuel pump that pumps fuel to a common fuel rail of the engine; and

    setting a degradation condition in response to a fuel rail pressure decay rate of a fuel pressure in the common fuel rail being greater than a decay threshold after a first designated duration.

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