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Control Device for an Internal Combustion Engine

  • US 20100012100A1
  • Filed: 05/26/2009
  • Published: 01/21/2010
  • Est. Priority Date: 07/18/2008
  • Status: Active Grant
First Claim
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1. A control device for an internal combustion engine comprising:

  • an evaporative fuel gas adsorption unit which adsorbs evaporative fuel gas from a fuel tank;

    an evaporative fuel gas purging unit which is internally provided with an opening-adjustable purge control valve and which purges evaporative fuel gas adsorbed by the evaporative fuel gas adsorption unit into an intake passage of the internal combustion engine;

    a fuel correction unit which feedback controls, based on an air-fuel ratio detected by an air-fuel ratio detection unit, an air-fuel ratio of an air-fuel mixture to be fed to the internal combustion engine to a prescribed value;

    a purge control valve opening control unit which performs control to open the purge control valve under a prescribed condition;

    a purge quantity calculation unit which, with the purge control valve open under the prescribed condition, calculates a quantity of purged evaporative fuel gas based on a fuel correction value determined by the fuel correction unit engaged in fuel correction calculation for realizing a prescribed air-fuel ratio;

    an adsorption quantity estimation unit which determines, based on a quantity of purged evaporative fuel gas calculated by the purge quantity calculation unit, a quantity of evaporative fuel gas adsorbed by the evaporative fuel gas adsorption unit;

    an adsorption quantity change calculation unit which changes, according to a condition of the internal combustion engine and vehicle, a quantity of evaporative fuel gas determined by the adsorption quantity estimation unit;

    an adsorption quantity correction unit which corrects, according to a condition of the fuel correction unit, a change value calculated by the adsorption quantity change calculation unit; and

    a fuel correction value calculation unit which calculates a fuel correction value based on an adsorption quantity change calculated by the adsorption quantity change calculation unit.

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