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METHOD OF AND DEVICE FOR CONTROLLING PRESSURE IN ACCUMULATION CHAMBER OF ACCUMULATION FUEL INJECTION APPARATUS

  • US 20100269790A1
  • Filed: 10/09/2008
  • Published: 10/28/2010
  • Est. Priority Date: 01/18/2008
  • Status: Active Grant
First Claim
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1. A method of controlling an accumulation chamber pressure in an accumulator fuel injection apparatus, which comprises an accumulation chamber for storing a fuel under pressure, a fuel injection nozzle for injecting the fuel in the accumulation chamber into an internal combustion engine, and a fuel pump for pumping the fuel to the accumulation chamber, an accumulator fuel injection apparatus controlling a pump discharge amount of the fuel pump to bring a fuel pressure prevailing in the accumulation chamber to a target pressure,wherein the method comprises the steps of:

  • calculating a pump discharge command value of the fuel pump by using feedback, based on a pressure difference between an actual accumulation chamber pressure detected by a fuel pressure sensor and the target pressure of the accumulation chamber;

    producing a numerical model of the pump discharge command value of the fuel pump, a disturbance pressure acting on the accumulation chamber, and accumulation chamber pressure using a transfer function of the fuel pump;

    estimating a pressure of the disturbance from the numerical model;

    deriving a compensation value to compensate for the disturbance by using a disturbance observer; and

    correcting an output calculated by the feedback with the disturbance compensation value derived by the disturbance observer.

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