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Engine cold start fuel control method having low volatility fuel detection and compensation

  • US 6,588,409 B2
  • Filed: 09/13/2001
  • Issued: 07/08/2003
  • Est. Priority Date: 09/14/2000
  • Status: Expired due to Fees
First Claim
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1. A method of operation for an internal combustion engine having an open-loop fuel control for maintaining an air/fuel ratio of said engine at a target value during engine starting and warm-up, comprising the steps of:

  • measuring a speed of said engine during engine starting;

    determining a time required for the measured speed to increase from a lower reference speed to an upper reference speed;

    detecting the presence of high driveability index fuel if the determined time exceeds a reference time; and

    temporarily enriching said air/fuel ratio relative to said target value when the presence of high driveability index fuel is detected.

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