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Method and device for operating a high-pressure accumulator fuel injection system for an internal combustion engine

  • US 9,410,498 B2
  • Filed: 08/17/2011
  • Issued: 08/09/2016
  • Est. Priority Date: 08/27/2010
  • Status: Active Grant
First Claim
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1. A method for operating a high-pressure accumulator fuel injection system for an internal combustion engine of a motor vehicle having an automatic stop/start function for deactivating and subsequently restarting the internal combustion engine independent of an intervention by the motor vehicle driver, in which fuel is fed to a high-pressure accumulator by a high-pressure pump, with at least one injector connected to the high-pressure accumulator for injecting fuel into at least one cylinder of the internal combustion engine, the method comprising:

  • measuring a pressure of fuel in the high-pressure accumulator periodically during a stop phase of operation;

    correlating the measured pressure value to an actuation current value of an electrically activated pressure control valve which is open in a currentless state using a pressure/current characteristic curve;

    supplying a current to the pressure control valve at the actuation current value; and

    as the stop phase continues, adjusting the supplied current based on a pressure drop in the high-pressure accumulator and the pressure/current characteristic curve.

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